User’s Guide
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The Agilent E3633A and Agilent E3634A are high performance 200 watt single-
output dual range programmable DC power supplies with both GPIB and RS-
232 interfaces. The combination of bench-top and system features in these
power supplies provides versatile solutions for your design and test
requirements.
Convenient bench-top features
• Single-output dual range
• Easy-to-use knob control settings
• Highly visible vacuum-fluorescent display meters
• High accuracy and high resolution
• Remote voltage sensing
• Overvoltage and overcurrent protection
• Output on/off
• Excellent load and line regulation and low ripple and noise
• Operating states storage
• Portable, ruggedized case with non-skid feet
• Front and Rear output terminals
• Retrieving/Scrolling error messages on the display
Flexible system features
• GPIB (IEEE-488) and RS-232 interfaces are standard
• SCPI (Standard Commands for Programmable Instruments) compatibility
• I/O setup easily done from front-panel
• Software calibration, no internal adjustments required
Agilent E3633A and E3634A
DC Power Supplies
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The Front Panel at a Glance
1 8V/20A range selection key (E3633A)
25V/7A range selection key (E3634A)
2 20V/10A range selection key (E3633A)
50V/4A range selection key (E3634A)
3 Overvoltage protection key
7 Store operating state/Local key
8 Error/Calibrate key
9 I/O Configuration/Secure key
10 Output On/Off key
11 Control knob
4 Overcurrent protection key
5 Display limit key
6 Recall operating state key
12 Resolution selection keys
13 Voltage/current adjust selection key
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1 8V/20A* or 25V/7A** range selection key Selects the 8V/20A or 25V/7A
range and allows the full rated output to 8V/20A or 25V/7A.
2 20V/10A* or 50V/4A** range selection key Selects the 20V/10A or
50V/4A range and allows the full rated output to 20V/10A or 50V/4A.
3 Overvoltage protection key Enables or disables the overvoltage protection
function, sets trip voltage level, and clears the overvoltage condition.
4 Overcurrent protection key Enables or disables the overcurrent protection
function, sets trip current level, and clears the overcurrent condition.
5 Display limit key Shows voltage and current limit values on the display and
allows knob adjustment for setting limit values.
6 Recall operating state key Recalls a previously stored operating state from
location ‘‘1’’, ‘‘2’’, or ‘‘3’’.
7 Store operating state / Local key1 Stores an operating state in location ‘‘1’’,
‘‘2’’, or ‘‘3’’ / or returns the power supply to local mode from remote interface
mode.
8 Error / Calibrate key2 Displays error codes generated during operation, self-
test and calibration / or enables calibration mode (the power supply must be
unsecured before performing calibration). See Service Guide for more details
on calibration.
9 I/O Configuration / Secure key3 Configures the power supply for remote
interfaces / or secure or unsecure the power supply for calibration. See
Service Guidefor more detailson how to secure or unsecure the power supply.
10 Output On/Off key Enables or disables the power supply output. This key
toggles between on and off.
11 Control knob Increases or decreases the value of the blinking digit by turning
clockwise or counter clockwise.
12 Resolution selection keys Move the blinking digit to the right or left.
13 Voltage/current adjust selection key Selects the knob control function for
voltage or current adjustment.
1The key can be used as the ‘‘Local’’ key when the power supply is in the remote
interface mode.
2You can enable the ‘‘calibration mode’’ by holding down this key when you
turn on the power supply.
3You can use it as the ‘‘Secure’’ or ‘‘Unsecure’’ key when the power supply is
in the calibration mode.
*For Agilent E3633A Model **For Agilent E3634A Model
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Front-Panel Voltage and Current Limit Settings
You can set the voltage and current limit values from the front panel using the
following method.
Use the voltage/current adjust selection key, the resolution selection keys,
and the control knob to change the voltage and current limit values.
1 Select the desired range using the range selection keys after turning on the
power supply.
Display
Limit
2 Press the
key to show the limit values on the display.
3 Move the blinking digit to the appropriate position using the resolution
selection keys and change the blinking digit value to the desired voltage limit
Display
Limit
by turning the control knob. If the display limit times out, press the
again.
key
Voltage
Current
4 Set the knob to current control mode by pressing the
key.
5 Move the blinking digit to the appropriate position using the resolution
selection keys and change the blinking digit value to the desired current limit
by turning the control knob.
Output
6 Press the
will go to output monitoring mode automatically to display the voltage and
key to enable the output. After about 5 seconds, the display
On/Off
current at the output or the display will go to output monitoring mode
immediately by pressing the
Output
On/Off
key again.
N o t e
All front panel keys and controls can be disabled with remote interface commands.
The Agilent E3633A and Agilent E3634A must be in "Local" mode for the front panel
keys and controls to function.
4
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Display Annunciators
Adrs
Rmt
8V
Power supply is addressed to listen or talk over a remote interface.
Power supply is in remote interface mode.
Shows the 8V/20A range is selected. (Agilent E3633A model)
Shows the 20V/10A range is selected. (Agilent E3633A model)
Shows the 25V/7A range is selected. (Agilent E3634A model)
Shows the 50V/4A range is selected. (Agilent E3634A model)
20V
25V
50V
OVP
The overvoltage protection function is enabled when the
annunciator turns on or the overvoltage protection circuit has
caused the power supply to shutdown when the annunciator blinks.
OCP
The overcurrent protection function is enabled when the
annunciator turns on or the overcurrent protection circuit has
caused the power supply to shutdown when the annunciator blinks.
CAL
The power supply is in calibration mode.
Limit
The display shows the limit values of voltage and current.
ERROR Hardware or remote interface command errors are detected and
the error bit has not been cleared.
OFF
The output of the power supply is disabled (See page 52 for more
information).
Unreg
The output of the power supply is unregulated (output is neither CV
nor CC).
CV
CC
The power supply is in constant voltage mode.
The power supply is in constant current mode.
Display
Limit
To review the display annunciators, hold down
the power supply.
key as you turn on
5
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The Rear Panel at a Glance
1 Power-line voltage setting 5 GPIB (IEEE-488) interface connector
2 Power-line fuse-holder assembly 6 RS-232 interface connector
3 AC inlet
4 Power-line module
7 Rear output terminals
I/O
Config
Use the front-panel
key to:
• Select the GPIB or RS-232 interface (see chapter 3).
• Set the GPIB bus address (see chapter 3).
• Set the RS-232 baud rate and parity (see chapter 3).
6
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In This Book
General Information Chapter 1 contains a general description of your
powersupply. This chapteralso providesinstructionsfor checkingyourpower
supply, connecting to ac power, and selecting power-line voltage.
Initial Operation Chapter 2 ensures that the power supply develops its rated
outputs and properly responds to operation from the front panel.
Front-Panel Operation Chapter 3 describes in detail the use of front-panel
keys and how they are used to operate the power supply from the front panel.
This chapter also shows how to configure the power supply for the remote
interface and gives a brief introduction to the calibration features.
Remote Interface Reference Chapter 4 contains reference information to
help you program the power supply over the remote interface. This chapter
also explains how to program for status reporting.
Error Messages Chapter 5 lists the error messages that may appear as you
are working with the power supply. Each listing contains information to help
you diagnose and solve the problem.
Application Programs Chapter 6 contains some remote interface
applications to help you develop programs for your application.
Tutorial Chapter 7 describes basic operation of linearpower supplies and
gives specific details on the operation and use of the Agilent E3633A and
Agilent E3634A power supplies.
Specifications Chapter 8 lists the power supply’s specifications.
If you have questions relating to the operation of the power supply, call
1-800-452-4844 in the United States, or contact your nearest Agilent
Technologies Sales Office.
If your Agilent E3633A or Agilent E3634A fails within three years of purchase,
Agilent will repair or replace it free of charge. Call 1-800-258-5165 ("Express
Exchange") in the United States, or contact your nearest Agilent Technologies
Sales Office.
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Contents
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Contents
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Contents
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Contents
Reliability- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 160
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General Information
This is the User’s guide for your Agilent E3633A and E3634A DC power
supplies. Unless otherwise stated, the information in this manual applies to
both two models.
This chapter provides a general description of your power supply. This chapter
also contains instructions for initial inspection, location and cooling for bench
and rack operation, selecting the power-line voltage, and connecting your
power supply to ac power.
Safety Considerations
This power supply is a Safety Class I instrument, which means that it has a
protective earth terminal. That terminal must be connected to earth ground
through a power source with a 3-wire ground receptacle.
Before installation or operation, check the power supply and review this
manual for safety markings and instructions. Safety information for specific
procedures is located at the appropriate places in this manual. See also
‘‘Safety’’ at the beginning of this manual for general safety information.
Safety and EMC Requirements
This power supply is designed to comply with the following safety and EMC
(Electromagnetic Compatibility) requirements:
• IEC 1010-1(1990)/EN 61010-1(1993) + A2 (1995): Safety Requirements for
Electrical Equipment for Measurement, Control, and Laboratory Use
• CSA C22.2 No.1010.1-92: Safety Requirements for Electrical Equipment for
Measurement, Control, and Laboratory Use
• EN50082-1(1992):
IEC 1000-4-2(1995): Electrostatic Discharge Requirements
IEC 1000-4-3(1995): Radiated Electromagnetic Field Requirements
IEC 1000-4-4(1995): Electrical Fast Transient/Burst Requirements
EN61000-4-5(1995): Surge Requirements
EN61000-4-6(1995): Conducted Radio Frequency Immunity Requirements
EN61000-4-8(1993): Magnetic Field Requirements
EN61000-4-11(1994): Voltage dips, short, interruption and var Requirement
• Low Voltage Directive 73/23/EEC
• EMC Directive 89/336/EEC
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Chapter 1 General Information
Options and Accessories
1
• EN 55011(1991) Group 1, Class A/CISPR 11(1990): Limits and Methods of
Radio Interference Characteristics of Industrial, Scientific, and Medical
(ISM) Radio - Frequency Equipment
Options and Accessories
Options
Option ‘‘0E3’’ and ‘‘0E9’’ determine which power-line voltage is selected at the
factory. The standard unit is configured for 115 Vac 10%, 47-63 Hz input
voltage. For more information about changing the power-line voltage setting,
Option Description
0E3
0E9
1CM
910
230 Vac 10%, 47-63 Hz input voltage
100 Vac 10%, 47-63 Hz input voltage
Rack mount kit (Agilent part number 5063-9243)
Extra manual set (same language as the selected language manual
set when you order the power supply)*
Accessories
The accessories listed below may be ordered from your local Agilent
Technologies Sales Office either with the power supply or separately.
Agilent No. Description
10833A
10833B
34398A
GPIB cable, 1 m (3.3 ft.)
GPIB cable, 2 m (6.6 ft.)
RS-232, 9 pin (f) to 9 pin (f), 2.5 m (8.2 ft.) cable; plus 9 pin (m) to
25 pin (f) adapter
34399A
RS-232 adapter kit (contains 4 adapters):
9 pin (m) to 25 pin (m) for use with PC or printer
9 pin (m) to 25 pin (f) for use with PC or printer
9 pin (m) to 25 pin (m) for use with modem
9 pin (m) to 9 pin (m) for use with modem
*To order a separate set of English User’s guide and Service guide, order
Agilent part number E3634-90000.
15
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Chapter 1 General Information
Description
Description
The Agilent E3633A and Agilent E3634A DC power supplies feature a
combination of programming capabilities and linear power supply
performancethatmakesthemidealforpowersystemsapplications.Thepower
supply is programmable locally from the front panel or remotely over the GPIB
and RS-232 interfaces. This power supply has two ranges, allowing more
voltage at a lower current. An output range needed is selected from the front
panel or over the remote interfaces.
Operational features include:
• Dual range of single-output: 8V/20A and 20V/10A (Agilent E3633A),
25V/7A and 50V/4A (Agilent E3634A)
• Constant voltage (CV) or constant current (CC) operation
• Overvoltage protection (OVP) and overcurrent protection (OCP)
• Three storage locations (1 to 3) for user-defined operating states
• Automatic turn-on self-test
• Remote sensing for load voltage at the front or rear panel terminals
• User calibration from the front panel or over the remote interfaces
The front panel operation permits:
• Easy-to-use of knob control
• Output range selection
• Enabling or disabling OVP and OCP features
• Setting the OVP and OCP trip levels
• Clearing OVP and OCP conditions
• Setting and displaying the voltage and current limit values
• Saving and recalling operating states
• Returning the power supply to local mode from remote interface mode
• Retrieving/Scrolling error messages on the display
• Calibrating the power supply, including changing the calibration secure
code
• Configuring the power supply for remote interfaces
• Enabling or disabling the output
16
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Chapter 1 General Information
Description
1
When operated over the remote interface, the power supply can be both a
listener and a talker. Using an external controller, you can instruct the power
supply to set the output and to send the status data back over the GPIB or
RS-232. Capabilities include the following features:
• Voltage and current programming
• Voltage and current readback
• Present and stored status readback
• Programming syntax error detection
• Complete self-test
The front-panel VFD (Vacuum-Fluorescent Display) includes:
• Displaying actual values of output voltage and current (meter mode)
• Or displaying the limit values of voltage and current (limit mode)
• Checking the operating status from the annunciators
• Checking the type of error from the error codes (messages)
Connections to the power supply’s output and to chassis ground are made to
binding posts on the front panel and to the rear output terminals.
W a r n i n g
Floating the power supply output more than 60 Vdc from the chassis presents an
electric shock hazard to the operator. Do not float the outputs more than 60 Vdc
when metal shorting bars without insulation are used to connect the (+) output to the
(+) sense and the (-) output to the (-) sense terminals.
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Chapter 1 General Information
Description
W a r n i n g
Outputs can be floated to maximum of 240 Vdc provided that the metal shorting bars
without insulation are either replaced with insulated conductors or they are removed
from the terminals so there is no operator access to the output conductors without
insulation. All field wiring insulation must be adequate for the voltage present.
The power supply is shipped with a detachable, 3-wire grounding type power
cord. The ac line fuse is an extractor type on the rear panel. The power supply
can be calibrated from the front panel directly or with a controller over the
GPIB or RS-232 interface using calibration commands. Correction factors are
stored in nonvolatile memory and are used during output programming.
Calibration from the front panel or a controller eliminate the need to remove
the top cover or even the need to remove the power supply from your system
cabinet. You can guard against unauthorized calibration by using the “Secured”
calibration protection function.
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Chapter 1 General Information
Installation
1
Installation
Initial Inspection
When you receive your power supply, inspect it for any obvious damage that
may have occurred during shipment. If any damage is found, notify the carrier
and the nearest Agilent Sales Office immediately. Warranty information is
shown in the front of this manual.
Keep the original packing materials in case the power supply hasto be returned
toAgilentTechnologiesinthe future. Ifyoureturnthe powersupply forservice,
attach a tag identifying the owner and model number. Also include a brief
description of the problem.
Mechanical Check
This check confirms that there are no broken keys or knob, that the cabinet
and panel surfaces are free of dents and scratches, and that the display is not
scratched or cracked.
Electrical Check
Chapter 2 describes an initial operation procedure which, when successfully
completed, verifies to a high level of confidence that the power supply is
operating in accordance with its specifications. Detailed electrical verification
procedures are included in the Service Guide.
Cooling and Location
Cooling
The power supply can operate without loss of performance within the
temperature range of 0 °C to 40 °C, and with derated output current from
40 °C to 55 °C. A fan cools the power supply by drawing air through the rear
panel and exhausting it out the sides. Using an Agilent rack mount will not
impede the flow of air.
Bench Operation
Your power supply must be installed in a location that allows sufficient space
at the sides and rear of the power supply for adequate air circulation. The
rubber bumpers must be removed for rack mounting.
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Chapter 1 General Information
Installation
Rack Mounting
The power supply can be mounted in a standard 19-inch rack cabinet using one
of three optional kits available. A rack-mounting kit for a single instrument is
available as Option 1CM (P/N 5063-9243). Installation instructions and
hardware are included with each rack-mounting kit. Any Agilent System II
instrument of the same size can be rack-mounted beside the Agilent E3633A
or E3634A DC power supply.
Remove the front and rear bumpers before rack-mounting the power supply.
To remove the rubber bumper, stretch a corner and then slide it off.
To rack mount a single instrument, order adapter kit 5063-9243.
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Chapter 1 General Information
Installation
1
To rack mount two instrument side-by-side, order lock-link kit 5061-9694
and flange kit 5063-9214.
To install one or two instruments in a sliding support shelf, order shelf
5063-9256, and slide kit 1494-0015.
21
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Chapter 1 General Information
Input Power Requirements
Input Power Requirements
You can operate your power supply from a nominal 100 V, 115 V, or 230 V single
phase ac power source at 47 to 63 Hz. An indication on the rear panel shows
the nominal input voltage set for the power supply at the factory. If necessary,
you can change the power-line voltage setting according to the instructions on
the next page.
Power-Line Cord
The power supply is shipped from the factory with a power-line cord that has
a plug appropriate for your location. Contact the nearest Agilent Sales and
Service Office ifthe wrong power-line cord isincluded with your power supply.
Your power supply is equipped with a 3-wire grounding type power cord; the
third conductor being the ground. The power supply is grounded only when
the power-line cord is plugged into an appropriate receptacle. Do not operate
your power supply without adequate cabinet ground connection.
Power-Line Voltage Selection
Power-line voltage selection is accomplished by adjusting two components:
power-line voltage selector and power-line fuse on the power-line module of
the rear panel. To change the power-line voltage, proceed as follows:
22
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Chapter 1 General Information
Input Power Requirements
1
1 Remove the power cord. Remove the
fuse-holder assembly with a flat-blade
screwdriver from the rear panel.
2 Install the correct line fuse. Remove
the power-line voltage selector from the
power-line module.
100 or 115 Vac, 6.3 AT fuse
230 Vac, 3.15 AT fuse
4 Replace the power-line voltage selector
and the fuse-holder assembly in the rear
panel.
3 Rotate the power-line voltage selector
until the correct voltage appears.
100, 115, or 230 Vac
23
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Chapter 1 General Information
Input Power Requirements
24
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Initial Operation
There are three basic tests in this chapter. The automatic power-on test
includes a self-test that checks the internal microprocessors and allows the
user visually to check the display. The output check ensures that the power
supply develops its rated outputs and properly responds to operation from the
front panel. For complete performance and/or verification tests, refer to the
Service Guide.
This chapter is intended for both the experienced and the inexperienced user
because it calls attention to certain checks that should be made prior to
operation.
Throughout this chapter the key to be pressed is shown in the left margin.
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Chapter 2 Initial Operation
Preliminary Checkout
Preliminary Checkout
The following steps help you verify that the power supply is ready for use.
1 Check the list of supplied items.
2
Verify that you have received the following items with your power supply. If
anything is missing, contact your nearest Agilent Technologies Sales Office.
One power cord for your location.
This User’s Guide.
One Service Guide.
Certificate of Calibration.
2 Verify the power-line voltage setting on the rear panel.
The power-line voltage is set to the proper value for your country when the
power supply is shipped from the factory. Change the voltage setting if it is not
correct. The settings are: 100, 115, or 230 Vac.
3 Verify that the correct power-line fuse is installed.
The correct fuse is installed for your country when the power supply is shipped
from the factory. For 100 or 115 Vac operation, you must use a 6.3 AT fuse. For
230 Vac operation, you must use a 3.15 AT fuse.
4 Connect the power-line cord and turn on your power supply.
The front-panel display will light up and a power-on self-test occurs
automatically when you turn on the power supply.
See ‘‘Power-Line Voltage Selection’’, starting on page 22 in chapter 1 if you
need to change the power-line voltage or the power-line fuse.
To replace the 6.3 AT fuse, order Agilent part number 2110-1030.
To replace the 3.15 AT fuse, order Agilent part number 2110-1031.
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Chapter 2 Initial Operation
Power-On Checkout
Power-On Checkout
The power-on test includes an automatic self-test that checks the internal
microprocessors and allows the user visually to check the display. You will
observe the following sequence on the display after pressing the front panel
power switch to on.
1 The front-panel display will light up briefly while the instrument
performs its power-on self-test.
To review the power-on display with all annunciators turned on, hold down
Display
key as you turn on the power supply.
Limit
2 The GPIB address or RS-232 is also displayed for about one second.
ADDR 05 (or RS-232)
The GPIB address is set to ‘‘5’’ when the power supply is shipped from the
factory for remote interface configuration. If this is not the first time the power
supply is turned on, a different interface (RS-232) or a different GPIB address
may appear.
need to change the remote interface configuration.
3 The “8V”* or “25V”**, “OVP”, “OCP” and “OFF” annunciators are on.
All others are off.
The power supply will go into the power-on / reset state; the output is disabled
(the OFF annunciator turns on); the 8/20A* or 25V/7A** range is selected (the
8V* or 25V** annunciator turns on); and the knob is selected for voltage
control. Notice that the OVP and OCP annunciator also turn on.
Output
On/Off
4 Enable the outputs.
The OFF annunciator turns off and the 8V* or 25V**, OVP, OCP, and CV
annunciators are lit. The blinking digit can be adjusted by turning the knob.
Notice that the display is in the meter mode. ‘‘Meter mode’’ means that the
display shows the actual output voltage and current.
N o t e
If the power supply detects an error during power-on self-test, the ERROR
*For Agilent E3633A Model **For Agilent E3634A Model
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Chapter 2 Initial Operation
Output Checkout
Output Checkout
The following procedures check to ensure that the power supply develops its
rated outputs and properly responds to operation from the front panel. For
complete performance and verification tests, refer to the Service Guide.
2
For each step, use the keys shown on the left margins.
Voltage Output Checkout
The following steps verify basic voltage functions with no load.
Power
1 Turn on the power supply.
The power supply will go into the power-on / reset state; the output is disabled
(the OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the
8V* or 25V** annunciator turns on); and the knob is selected for voltage
control.
Output
On/Off
2 Enable the outputs.
The OFF annunciator turns off and the 8V* or 25V**, OVP, OCP, and CV
annunciators are lit. The blinking digit can be adjusted by turning the knob.
Notice that the display is in the meter mode. ‘‘Meter mode’’ means that the
display shows the actual output voltage and current.
3 Check that the front-panel voltmeter properly responds to knob
control for the 8V/20A* or 25V/7A** range.
Turn the knob clockwise or counter clockwise to check that the voltmeter
responds to knob control and the ammeter indicates nearly zero.
1
4 Ensure that the voltage can be adjusted from zero to the full rated
value.
Adjust the knob until the voltmeter indicates 0 volts and then adjust the knob
until the voltmeter indicates ‘‘8.0 volts’’* or ‘‘25.0 volts’’**
1You can use the resolution selection keys to move the blinking digit to the
right or left when setting the voltage.
*For Agilent E3633A Model **For Agilent E3634A Model
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Chapter 2 Initial Operation
Output Checkout
Current Output Checkout
The following steps check basic current functions with a short across the
power supply’s output.
Power
1 Turn on the power supply.
The power supply will go into the power-on / reset state; the output is disabled
(the OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the
8V* or 25V** annunciator turns on); and the knob is selected for voltage
control.
2 Connect a short across (+) and (-) output terminals with an insulated
test lead.
Use a wire size sufficient to handle the maximum current (See "Table 7-1 Wire
Output
On/Off
3 Enable the output.
The OFF annunciator turns off and the 8V* or 25V**, OVP, and OCP
annunciators are lit. The CV or CC annunciator turns on depending on the
resistance of the test lead. The blinking digit can be adjusted by turning the
knob. Notice that the display is in the meter mode. ‘‘Meter mode’’ means that
the display shows the actual output voltage and current.
Display
Limit
4 Adjust the voltage limit value to 1.0 volt.
Set the display to the limit mode (theLimit annunciator will be blinking). Adjust
the voltage limit to 1.0 volt to assure CC operation. The CC annunciator will
turn on. To go back to normal mode, press the Display key again or let the display
time out for several seconds .
Limit
Voltage
Current
5 Set the knob to the current control to check that the front-panel
ammeter properly responds to knob control.
Turn the knob clockwise or counter clockwise when the display is in the meter
mode (the Limit annunciator is off). Check that the ammeter responds to knob
control and the voltmeter indicates nearly zero (the voltmeter will show the
voltage drop caused by the test lead).
*For Agilent E3633A Model **For Agilent E3634A Model
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Chapter 2 Initial Operation
Output Checkout
1
6 Ensure that the current can be adjusted from zero to the full rated
value.
Adjust the knob until the ammeter indicates 0 amps and then until the ammeter
indicates 20.0 amps* or 7.0 amps**.
2
7 Turn off the power supply and remove the short from the output.
1You can use the resolution selection keys to move the blinking digit to the
right or left when setting the current.
N o t e
If an error has been detected during the output checkout procedures, the ERROR
*For Agilent E3633A Model **For Agilent E3634A Model
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Chapter 2 Initial Operation
Output Checkout
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Front-Panel Operation
So far you have learned how to install your power supply and perform initial
operation. During the initial operation, you were briefly introduced to
operating from the front panel as you learned how to check basic voltage and
current functions. This chapter will describe in detail the use of these front-
panel keys and show how they are used to accomplish power supply operation.
• Front-Panel Operation Overview, on page 35
• Constant Voltage Operation, starting on page 36
• Constant Current Operation, starting on page 38
• Storing and Recalling Operating States, starting on page 40
• Programming Overvoltage Protection, starting on page 42
• Programming Overcurrent Protection, starting on page 46
• Remote Voltage Sensing at the front and rear panel, starting on page 49
• Disabling the Output, on page 52
• Disabling the Output Using an External Relay, on page 53
• Knob Locking, on page 53
• System-Related Operations, starting on page 54
• Remote Interface Configuration, starting on page 58
• GPIB Interface Configuration, on page 63
• RS-232 Interface Configuration, starting on page 64
• Calibration Overview, starting on page 68
Throughout this chapter the key to be pressed is shown in the left margin.
N o t e
See "Error Messages", starting on page 123 in chapter 5 if you encounter any errors
during front-panel operation.
34
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Chapter 3 Front-Panel Operation
Front-Panel Operation Overview
Front-Panel Operation Overview
The following section describes an overview of the front-panel keys before
operating your power supply.
• The power supply is shipped from the factory configured in the front-panel
operation mode. At power-on, the power supply is automatically set to
operate in the front-panel operation mode. When in this mode, the front-
panelkeyscanbe used. Whenthepowersupplyisinremoteoperationmode,
you can return to front-panel operation mode at any time by pressing the
Store
(Local) key if you did not previously send the front-panel lockout
command. A change between front-panel and remote operation modes will
not result in a change in the output parameters.
Local
3
• The power supply has two output ranges. This feature allows more voltage
at a lower current or more current at a lower voltage. The desired output
range is selected from the front panel or over the remote interfaces. The 8V
or 20V for the E3633A and 25V or 50V for the E3634A annunciator indicates
the presently selected range.
Display
Limit
• When you press key (the Limit annunciator blinks), the display of the
power supply goes to the limit mode and the present limit values will be
displayed. In this mode, you can also observe the change of the limit values
when adjusting the knob. If you press the
Display
Limit
key again or let the display
time-out after several seconds, the power supply will return the display to
the meter mode (the Limit annunciator turns off). In this mode, the actual
output voltage and current will be displayed.
• The output of the power supply can be enabled or disabled from the front
panel by pressing key. When the output is off, the OFF annunciator
turns on and the output is disabled.
Output
On/Off
• The display provides the present operating status of the power supply with
annunciators and also informs the user of error codes. For example, the
power supply is operating in CV mode in the 8V/20A* or 25V/7A** range and
controlled from the front panel, then the CV and 8V* or 25V** annunciators
will turn on. If, however, the power supply is remotely controlled, the Rmt
annunciator will also turnon, and whenthe power supply is being addressed
*For Agilent E3633A Model **For Agilent E3634A Model
35
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Chapter 3 Front-Panel Operation
Constant Voltage Operation
Constant Voltage Operation
To set up the power supply for constant voltage (CV) operation, proceed as
follows.
• Front-panel operation:
1 Connect a load to the output terminals.
With power-off, connect a load to the (+) and (-) output terminals.
Power
2 Turn on the power supply.
The power supply will go into the power-on / reset state; the output is disabled
(the OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the
8V* or25V**annunciator turns on);and the knob is selectedfor voltagecontrol.
50V,4A
Press 20V,10A * or
50V/4A** range before proceeding to the next step. The 20V* or 50V**
** key to operate the power supply in the 20V/10A* or
annunciator turns on.
Display
Limit
3 Set the display to the limit mode.
Notice that the Limit annunciator blinks, indicating that the display is in the
limit mode. When the display is in the limit mode, you can see the voltage and
current limit values of the power supply.
In constant voltage mode, the voltage values between the meter and
limit modes are the same, but the current values are not. Moreover, if the
display is in the meter mode, you cannot see the change of current limit
value when adjusting the knob. We recommend that you should set the
display to “limit” mode to see the change of current limit value in the
constant voltage mode whenever adjusting the knob.
1
Voltage
Current
4 Adjust the knob for the desired current limit.
Check that the Limit annunciator still blinks. Set the knob forcurrent control.
The second digit of the ammeter will be blinking. The blinking digit can be
changed using the resolution selection keys and the blinking digit can be
adjusted by turning the knob. Adjust the knob to the desired current limit.
1You can use the resolution selection keys to move the blinking digit to the
right or left when setting current.
*For Agilent E3633A Model **For Agilent E3634A Model
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Chapter 3 Front-Panel Operation
Constant Voltage Operation
1
Voltage
Current
5 Adjust the knob for the desired output voltage.
Check that the Limit annunciator still blinks. Set the knob forvoltage control.
The second digit of the voltmeter will be blinking. Change the blinking digit
using the resolution selection keys and adjust the knob to the desired output
voltage.
Display
Limit
6 Return to the meter mode.
Display
Press
the meter mode. Notice that the Limit annunciator turns off and the display
key or let the display time-out after several seconds to return to
Limit
shows “OUTPUT OFF” message.
Output
On/Off
3
7 Enable the output.
The OFF annunciator turns off and the 8V* (or 25V**) or 20V* (or 50V**), OVP,
OCP and CV annunciators are lit. Notice that the display is in themeter mode.
In the meter mode, the display shows the actual output voltage and current.
Refer to “Programming Overvoltage Protection” and “Programming
information on OVP and OCP annunciators.
8 Verify that the power supply is in the constant voltage mode.
If you operate the power supply in the constant voltage (CV) mode, verify that
the CV annunciator is lit. If the CC annunciator is lit, choose a higher current
limit.
N o t e
During actual CV operation, if a load change causes the current limit to be exceeded,
the power supply will automatically crossover to the constant current mode at the
preset current limit and the output voltage will drop proportionately.
• Remote interface operation:
CURRent {<current>|MIN|MAX}
VOLTage {<voltage>|MIN|MAX}
OUTPut ON
Set the current
Set the voltage
Enable the output
1You can use the resolution selection keys to move the blinking digit to the
right or left when setting voltage.
*For Agilent E3633A Model **For Agilent E3634A Model
37
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Chapter 3 Front-Panel Operation
Constant Current Operation
Constant Current Operation
To set up the power supply for constant current (CC) operation, proceed as
follows.
• Front-panel operation:
1 Connect a load to the output terminals.
With power-off, connect a load to the (+) and (-) output terminals.
Power
2 Turn on the power supply.
The power supply will go into the power-on / reset state; the output is disabled
(the OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the
8V* or25V**annunciator turns on);and the knob is selectedfor voltagecontrol.
20V,10A
To operate the power supply in the 20V/10A* or 50V/4A** range, press
50V,4A
*
or
annunciator turns on.
** key before proceeding to the next step. The 20V* or 50V**
Display
Limit
3 Set the display to the limit mode.
Notice that the Limit annunciator blinks, indicating that the display is in the
limit mode. When the display is in the limit mode, you can see the voltage and
current limit values of the selected supply.
In constant current mode, the current values between the meter mode
and limit mode are the same, but the voltage values are not. Moreover, if
the display is in the meter mode, you cannot see the change of voltage
limit value when adjusting the knob. We recommend that you should set
the display to “limit” mode to see the change of voltage limit value in the
constant current mode whenever adjusting the knob.
1
4 Adjust the knob for the desired voltage limit.
Check that the Limit annunciator still blinks and the second digit of voltmeter
blinks to indicate the knob is selected for voltage control. The blinking digit
can be changed using the resolution keys and the blinking digit can be adjusted
by turning the knob. Adjust the knob for the desired voltage limit.
1You can use the resolution selection keys to move the blinking digit to the
right or left when setting the voltage.
*For Agilent E3633A Model **For Agilent E3634A Model
38
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Chapter 3 Front-Panel Operation
Constant Current Operation
1
Voltage
Current
5 Adjust the knob for the desired output current.
Check that the Limit annunciator still blinks. Set the knob for currentcontrol.
The second digit of the ammeter will be blinking. Change the blinking digit
using the resolution selection keys and adjust the knob to the desired output
current.
Display
Limit
6 Return to the meter mode.
Display
Press
meter mode. Notice that the Limit annunciator turns off and the display shows
key or let the display time-out after several seconds to return the
Limit
“OUTPUT OFF” message.
Output
On/Off
3
7 Enable the output.
The OFF annunciator turns off and the 8V* (or 25V**) or 20V* (or 50V**), OVP,
OCP and CC annunciators are lit. Notice that the display is in the meter mode.
In the meter mode, the display shows the actual output voltage and current.
Refer to “Programming Overvoltage Protection” and “Programming
information on OVP and OCP annunciators.
8 Verify that the power supply is in the constant current mode.
If you operate the power supply in the constant current (CC) mode, verify that
the CC annunciator is lit. If the CV annunciator is lit, choose a higher voltage
limit.
N o t e
During actual CC operation, if a load change causes the voltage limit to be exceeded,
the power supply will automatically crossover to constant voltage mode at the preset
voltage limit and the output current will drop proportionately.
• Remote interface operation:
VOLTage {<voltage>|MIN|MAX}
CURRent {<current>|MIN|MAX}
OUTPut ON
Set the voltage
Set the current
Enable the output
1You can use the resolution selection keys to move the blinking digit to the
right or left when setting the current.
*For Agilent E3633A Model **For Agilent E3634A Model
39
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Chapter 3 Front-Panel Operation
Storing and Recalling Operating States
Storing and Recalling Operating States
You can store up to three different operating states in non-volatile memory.
This also enables you to recall the entire instrument configuration with just a
few key presses from the front panel.
The memory locations are supplied with the reset states from the factory for
front-panel operation. Refer to the description of *RST command, starting on
page 96 in chapter 4 for more information. The following steps show you how
to store and recall an operating state.
• Front-panel operation:
1 Set up the power supply for the desired operating state.
The storage feature “remembers” output range selection, the limit value
settings of voltage and current, output on/off state, OVP and OCP on/off state,
and OVP and OCP trip levels.
Store
2 Turn on the storage mode.
Three memory locations (numbered 1, 2 and 3) are available to store the
operating states. The operating states are stored in non-volatile memory and
are remembered when being recalled.
STORE 1
This message appears on the display for approximately 3 seconds.
3 Store the operating state in memory location “3”.
Turn the knob to the right to specify the memory location 3.
STORE 3
To cancel the store operation, let the display time-out after about 3 seconds
or pressany other functionkey exceptthe
Store
key. Thepowersupply returns
to the normal operating mode and to the function pressed.Save the operating
state.
40
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Chapter 3 Front-Panel Operation
Storing and Recalling Operating States
Store
4 Save the operating state.
The operating state is now stored. To recall the stored state, go to the following
steps.
DONE
Recall
5 Turn on the recall mode.
Memory location “1” will be displayed in the recall mode.
3
RECALL 1
This message appears on the display for approximately 3 seconds.
6 Recall the stored operating state.
Turn the knob to the right to change the displayed storage location to 3.
RECALL 3
Recall
Ifthis setting isnotfollowed within 3 secondswith
key stroke, the power
supply returns to normal operating mode and will not recall the instrument
state 3 from memory.
Recall
7 Restore the operating state.
The power supply should now be configured in the same state as when you
stored the state on the previous steps.
DONE
This message appears on the display for approximately 1 second.
• Remote interface operation:
*SAV {1|2|3}
*RCL {1|2|3}
Store an operating state to a specified location
Recall a previously stored state from a specified location
41
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Chapter 3 Front-Panel Operation
Programming Overvoltage Protection
Programming Overvoltage Protection
Overvoltage protection guards the load against output voltages that reach a
specified value greater than the programmed protection level. It is
accomplished by shorting the output via an internal SCR when the trip level is
set to equal or greater than 3 volts, or by progamming the output to 1 volt when
the trip level is set to less than 3 volts.
The following steps show how to set the OVP trip level, how to check OVP
operation, and how to clear overvoltage condition.
• Front-panel operation:
Setting the OVP Level and Enable the OVP Circuit
Power
1 Turn on the power supply.
The power supply will go into the power-on / reset state; the output is disabled
(the OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the
8V* or 25V** annunciator turns on); and the knob is selected for voltage control.
Output
On/Off
2 Enable the output.
The OFF annunciator turns off and the display will go to the meter mode.
Over
Voltage
3 Enter the OVP menu and set the trip level.
LEVEL 22.0V (E3633A)
LEVEL 55.0V (E3634A)
You will see the above message on the display when you enter the OVP menu.
Adjust the control knob for the desired OVP trip level.
Note that you cannot set the trip levels to lower than 1.0 volt.
Over
Voltage
4 Enable the OVP circuit.
OVP ON
Over
Voltage
You will see the above message after pressing
key.
*For Agilent E3633A Model **For Agilent E3634A Model
42
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Chapter 3 Front-Panel Operation
Programming Overvoltage Protection
Over
Voltage
5 Exit the OVP menu.
CHANGED
The “CHANGED” message is highlighted for a second to show that the new
OVP trip level is now in effect. If the OVP settings are not changed, “NO
CHANGE” will be displayed. The power supply will exit the OVP menu and the
display will return to the meter mode. Check that the OVP annunciator turns
on.
3
Checking OVP Operation
To check OVP operation, raise the output voltage to near the trip point. Then
very gradually increase the output by turning the knob until the OVP circuit
trips. This will cause the power supply output to drop to near zero, the OVP
annunciator to blink, and the CC annunciator to turn on. The “OVP TRIPPED”
message also appears on the display.
Clearing the Overvoltage Condition
When the OVP condition occurs (the “OVP TRIPPED” message is shown on
the display), the OVP annunciator blinks. When it was caused by an external
voltage source such as a battery, disconnect it first. Clear the overvoltage
condition by adjusting output voltage level or by adjusting OVP trip level.
The following steps show how to clear the overvoltage condition and get back
to normal mode operation. In the following steps, the display will go back to
“OVP TRIPPED” if you let the display time out after about several seconds.
• Adjust output voltage level
Display
Limit
1 Lower the output voltage level.
Display
Limit
Lower the output voltage level below the OVP trip point after pressing
key. The OVP and Limit annunciators are blinking.
Over
Voltage
2 Move to the clear mode.
OVP CLEAR
Over
Voltage
Press
key twice to move to the OVP CLEAR mode. The “OVP ON”
message appears on the display. Turn the knob to the right until the above
message appears on the display.
43
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Chapter 3 Front-Panel Operation
Programming Overvoltage Protection
Over
Voltage
3 Clear the overvoltage condition and exit this menu.
Over
Now, when you press
key again, the “DONE” message is displayed for a
second and the OVP annunciatorwillnotblinkany more. The outputwill return
Voltage
to meter mode.
• Adjust OVP trip level
Over
Voltage
1 Raise the OVP trip level.
Over
Press
key and turn the knob to raise the OVP trip level.
Voltage
Over
Voltage
2 Move to the OVP CLEAR mode.
OVP CLEAR
Over
Voltage
Press
key to move to the OVP CLEAR mode. The “OVP ON” message
appears on the display. Turn the knob to the right until the above message
appears on the display.
Over
Voltage
3 Clear the overvoltage condition and exit this menu.
Over
Now, when you press
key again, the “DONE’’ message is displayed for
a second and the OVP annunciator will not blink any more. The output will
Voltage
return to the meter mode.
• Remote interface operation:
VOLT:PROT {<voltage>|MIN|MAX} Set the OVP level
VOLT:PROT:STAT {OFF|ON)
VOLT:PROT:CLE
Disable or enable the OVP circuit
Clear the tripped OVP circuit
N o t e
The power supply’s OVP circuit contains a crowbar SCR, which effectively shorts the
output of the power supply whenever the overvoltage condition occurs. If external
voltage source such as a battery is connected across the output, and the overvoltage
condition inadvertently occurs, the SCR will continuously sink a large current from
the source; possibly damaging the power supply. To avoid this a diode must be
connected in series with the output as shown in Figure 3-1 on next page.
44
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Chapter 3 Front-Panel Operation
Programming Overcurrent Protection
Programming Overcurrent Protection
Overcurrent protection guards the load against output currents that reach a
specified value greater than the programmed protection level. It is
accomplished by programming the output current to zero.
The following steps show how to set the overcurrent protection trip level, how
to check OCP operation and how to clear overcurrent condition.
• Front-panel operation:
Setting the OCP Level and Enable the OCP Circuit
Power
1 Turn on the power supply.
The power supply will go into the power-on / reset state; the output is disabled
(the OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the
8V* or25V**annunciator turns on);and the knob is selectedfor voltagecontrol.
Output
On/Off
2 Enable the output.
The OFF annunciator turns off and the display will go to the meter mode.
Over
Current
3 Enter the OCP menu and set the trip level.
LEVEL 22.0 A(E3633A)
LEVEL 7.5 A (E3634A)
You will see the above message on the display when you enter the OCP menu.
Adjust the knob for the desired OCP trip level.
Over
Current
4 Enable the OCP circuit.
OCP ON
Over
Current
You will see the above message after pressing the
key.
*For Agilent E3633A Model **For Agilent E3634A Model
46
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Chapter 3 Front-Panel Operation
Programming Overcurrent Protection
Over
Current
5 Exit the OCP menu.
CHANGED
The “CHANGED” message is displayed for a second to show that the new OCP
trip level is now in effect. If the OCP settings are not changed, “NO CHANGE”
will be displayed. The power supply will exit the OCP menu and the display
will return to the meter mode. Check that the OCP annunciator turns on.
Checking OCP Operation
3
To check OCP operation, raise the output current to near the trip point. Then
very gradually increase the output by turning the knob until the OCP circuit
trips. This will cause the power supply’s output current to drop to zero and the
OCP annunciator to blink. The “OCP TRIPPED” message also appears on the
display.
Clearing the Overcurrent Condition
When the OCP condition occurs (the “OCP TRIPPED” message is shown on
the display), the OCP annunciator blinks. When it was caused by external
voltage sources such as a battery, disconnect it first. Clear the overcurrent
condition by adjusting output current level or by adjusting OCP trip level.
The following steps show how to clear the overcurrent condition and get back
to normal mode operation. In the following steps, the display will go back to
“OCP TRIPPED” if you let the display time out after about several seconds.
• Adjust output current level
Display
Limit
1 Lower the output current level.
Display
Voltage
key,
Current
Press
key and set the knob for current control by pressing
then lower the output current level below the OCP trip point.
Limit
Over
Current
2 Move to the clear mode.
OCP CLEAR
Over
Current
Press
key twice to move to the OCP CLEAR mode. The “OCP ON”
message appears on the display. Turn the knob to the right until the above
message appears on the display.
47
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Chapter 3 Front-Panel Operation
Programming Overcurrent Protection
Over
Current
3 Clear the overcurrent condition and exit this menu.
Over
Now, when you press
key again, the “DONE’’ message is displayed for
Current
a second and the OCP annunciator will not blink any more. The output will
return to meter mode. The knob is selected for current control.
Notice that the power supply is operated in the constant current (CC) mode.
• Adjust OCP trip level
Over
Current
1 Raise the OCP trip level.
Over
Press
key and turn the knob to raise the OCP trip level.
Current
Over
Current
2 Move to the OCP CLEAR mode.
OCP CLEAR
Press the key to move to the OCP CLEAR mode. The “OCP ON” message
appears on the display. Turn the knob to the right until the above message
appears on the display.
Over
Current
3 Clear the overcurrent condition and exit this menu.
Over
Now, when you press
key again, the “DONE’’ message is displayed for
Current
a second and the OCP annunciator will not blink any more. The output will
return to the meter mode.
• Remote interface operation:
CURR:PROT {<current>|MIN|MAX} Set the OCP level
CURR:PROT:STAT {OFF|ON}
CURR:PROT:CLE
Disable or enable the OCP circuit
Clear the tripped OCP circuit
48
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Chapter 3 Front-Panel Operation
Remote Voltage Sensing at the Front and Rear Terminals
Remote Voltage Sensing at the Front and Rear Terminals
Remote voltage sensing is used to maintain regulation at the load and reduce
the degradation of regulation that would occur due to the voltage drop in the
leads between the power supply and the load.
By connecting the power supply for remote voltage sensing, voltage is sensed
at the load rather than at the power supply’s output terminals. This will allow
the power supply to automatically compensate for the voltage drop in
applications with long lead lengths as well as to accurately read back the
voltage directly across the load.
3
Whenthepowersupplyisconnectedforremotesensing,the OVPcircuitsenses
the voltage at the sensing points (load) and not the output terminals.
CV Regulation
The voltage load regulation specification in chapter 8 applies at the output
terminals of the power supply. When remote sensing, add 5 mV to this
specification for each 1 V drop between the positive sensing point and (+)
output terminal due to the change in load current. Because the sense leads are
partofthe power supply’sfeedback path, keep the resistance ofthe sense leads
at or below 0.5 9 per lead to maintain the above specified performance.
Output Rating
The rated output voltage and current specifications in chapter 8 apply at the
output terminals of the power supply. With remote sensing, any voltage
dropped in the load leads must be added to the load voltage to calculate
maximum output voltage. The performance specifications are not guaranteed
when the maximum output voltage is exceeded. If the excessive demand on
the power supply forces the power supply to lose regulation, the Unreg
annunciator will turn on to indicate that the output is unregulated.
Output Noise
Any noise picked up on the sense leads also appears at the output of the power
supply and may adversely affect the voltage load regulation. Twist the sense
leads to minimize external noise pickup and run them parallel and close to the
load leads. In noisy environments it may be necessary to shield the sense leads.
Ground the shield at the power supply end only. Do not use the shield as one
of the sense conductors.
49
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Chapter 3 Front-Panel Operation
Remote Voltage Sensing at the Front and Rear Terminals
Stability
Using remote sensing under certain combinations of load lead lengths and
large load capacitances may cause your application to form a filter, which
becomes part of the voltage feedback loop. The extra phase shift created by
this filter can degrade the power supply’s stability, resulting in poor transient
response or loop instability. In severe cases, it may cause oscillations. To
minimize this possibility, keep the load leads as short as possible and twist
them together. As the sense leads are part of the power supply’s programming
feedback loop, accidental open-connections of sense or load leads during
remote sensing operation have various unwanted effects. Provide secure and
permanent connections.
Remote Voltage Sensing Connections
Connections between the power supply sensing and output terminals should
be removed, and using shielded two-wire cable, the power supply sensing
terminals should be connected to the load as shown in Figure 3-2. Do not use
the shield as one of the sensing conductors and the other end should be left
unconnected. Connect one end of the sensing lead shield to the chassis ground
(^) only. Opening a sensing lead causes the power supply output voltage to
decrease at the load leads. Observe polarity when connecting the sensing leads
to the load.
For local voltage sensing connections, the (+) and (-) sense terminals must be
connected to the (+) and (-) output terminals respectively.
N o t e
When you make the remote voltage sensing connections at the front or rear panel
terminals, make sure to disconnect all the connections to the load and sense leads
at the other end terminals. Do not make the sensing connections at both front and
rear terminals at the same time. It will cause to damage the power supply seriously.
Figure 3-2. Remote Voltage Sensing Connections
50
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Chapter 3 Front-Panel Operation
Remote Voltage Sensing at the Front and Rear Terminals
Remote Voltage Sensing at the Rear Panel
External sense terminals are also available on the back of the power supply
that allow the rear outputvoltages to be sensed atthe load, which compensates
for impedance losses in the load wiring. The front panel binding posts are
paralleled with the rear output terminals.
The rear output terminals accept wires sizes from AWG 22 to AWG 10.
To minimize the possibility of instability on the output, keep load leads as short
as possible and bundle or twist the leads tightly together to minimize
inductance.
3
Figure 3-3. Rear local sensing connections
N o t e
For rear local voltage sensing connections, the front shorting bars must be removed
first and connect the sense wires as shown in Figure 3-3.
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Chapter 3 Front-Panel Operation
Disabling the Output
Disabling the Output
The output of the power supply can be disabled or enabled from the frontpanel.
When the power supply is in the “Off” state, the OFF annunciator turns on and
the output is disabled. The OFF annunciator turns off when the power supply
returns to the “On” state. When the output is disabled, the voltage value is 0
volts and the current value is 0.02 amps.
The output state is stored in volatile memory; the output is always disabled
when power has been off or after a remote interface reset.
While the output is disabled, the range selection keys, the control knob,
resolution selection keys, and adjust selection key are still working. If the
display is in the meter mode, you cannot see the changes of output
voltage and current settings on the display when turning the knob. To see
or check the changes when the outputs are disabled, the display should be
in the limit mode.
• Front-panel operation:
Output
On/Off
You can disable the output by pressing
output “Off” and “On” states.
key. This key toggles between
• Remote interface operation:
OUTP {OFF|ON}
Disable or enable the output
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Chapter 3 Front-Panel Operation
Disabling the Output Using an External Relay
Disabling the Output Using an External Relay
When the output of the power supply is turned off, it is implemented by setting
the output to 0 volts and 0.02 amps. This gives a zero output voltage without
actually disconnecting the output. To disconnect the output an external relay
must be connected between the output and the load. A TTL signal of either low
true or high true is provided to control an external relay. This signal can only
becontrolledwiththeremote commandOUTPut:RELay{OFF|ON}. TheTTL
output is available on the RS-232 connection pin 1 and pin 0.
When the OUTPut:RELay state is “ON”, the TTL output of pin 1 is high
3
(4.5 V) and pin 9 is low (0.5 V). The levels are reversed when the
OUTPut:RELay state is “OFF”.
N o t e
N o t e
TTL output of pin 1 or pin 9 of the RS-232 connector is available only after installing
two jumpers inside the power supply. See the Service Guide for more information.
Do not use the RS-232 interface if you have configured the power supply to output
relay control signals. Internal components on the RS-232 circuitry may be damaged.
Knob Locking
The control knob can be locked to prevent from any unwanted changes
occurring during an experiment, or when you leave the power supply
unattended. To lock the knob, move the blinking digit to the right or left using
<
>
the resolution selection key
or
until the blinking digit disappears.
Notice that the knob and front panel keys are disabled when in the remote
interface mode.
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Chapter 3 Front-Panel Operation
System-Related Operations
System-Related Operations
This section gives information on topics such as self-test, error conditions, and
front-panel display control. This information is not directly related to setting
up the power supply but is an important part of operating the power supply.
Self-Test
A power-on self-test occurs automatically when you turn on the power supply.
This test assures you that the power supply is operational. This test does not
perform the extensive set of tests that are included as part of the complete self-
test described below. If the power-on self-test fails, the ERROR annunciator
turns on.
• A complete self-test performs a series of tests and takes approximately 2
seconds to execute. If all tests pass, you can have a high confidence that the
power supply is operational.
• If the completeself-test is successful, “PASS” is displayed on the front panel.
If the self-test fails, “FAIL” is displayed and the ERROR annunciator turns
on. See the Service Guide for instructions on returning the power supply to
Agilent Technologies for service.
• Front-panel operation:
Recall
To perform the complete front panel self-test, hold down the
turn on the power supply and hold down the key until you hear a long beep.
key as you
The self-test will begin when you release the key following the beep.
• Remote interface operation:
*TST?
Returns “0” if the complete self-test passes or “1” if it fails.
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Chapter 3 Front-Panel Operation
System-Related Operations
Error Conditions
When the front-panel ERROR annunciator turns on, one or more command
syntax or hardware errors have been detected. A record of up to 20 errors can
be stored in the power supply’s error queue. See chapter 5 “Error Messages”,
• Errorsare retrieved infirst-in-first-out(FIFO)order. Thefirsterror returned
is the first error that was stored. Errors are cleared as you read them over
the remote interface. When you have read all errors from the queue, the
ERROR annunciator turns off. The power supply beeps once each time an
error is generated.
• If more than 20 errors have occurred when you operate the power supply
over the remote interface, the last error stored in the queue (the most recent
error) is replaced with -350, “Too many errors”. No additional errors are
stored until you remove errors from the queue. If no errors have occurred
when you read the error queue, the power supply responds with +0, “No
error” over the remote interface or “NO ERRORS” from the front panel.
3
• The error queue is cleared when power has been off or after a *CLS(clear
status) command has been executed. The *RST(reset) command does not
clear the error queue.
• Front-panel operation:
Store
Press
(Local) key to return to front-panel operation mode if the power
supplyLioscainl remote operation mode.
3: ERR -102
Error
If the ERROR annunciator is on, press
knob to scroll through the error numbers. Press
key to view the errors. Use the
>
key to increase or decrease the scrolling
to view the text of the
<
>
error message. Press
or
speed of the text on the display. All errors are cleared when you exit the menu
or let the display time out for about 30 seconds.
• Remote interface operation:
SYSTem:ERRor?
Read and clear one error from the error queue
Errors have the following format (the error string may contain up to 80
characters).
-102, ‘‘Syntax error’’
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Chapter 3 Front-Panel Operation
System-Related Operations
Display Control
For security reasons, you may want to turn off the front-panel display. From
the remote interface, you can display a 12-character message on the front
panel.
• The display can be enabled / disabled from the remote interface only.
• When the display is turned off, outputs are not sent to the display and all
annunciators are disabled except the ERROR annunciator. Front-panel
operation is otherwise unaffected by turning off the display.
• The display state is stored in volatile memory; the display is always enabled
when power has been off, after a remote interface reset, or after returning
to local from remote.
• You can display a message on the front panel by sending a command from
the remote interface. The power supply can display up to 12 characters of
the message on the front panel; any additional characters are truncated.
Commas, periods, and semicolons share a display space with the preceding
character, and are not considered individual characters. When a message is
displayed, outputs are not sent to the display.
• Sending a message to the display from the remote interface overrides the
display state; this means that you can display a message even if the display
is turned off.
• The display state is automatically turned on when you return to the local
(Local) key to return to the local state
Store
(front panel) operation. Press
from the remote interface.
Local
• Remote interface operation:
DISP {OFF|ON}
Disable / enable the display
DISP:TEXT <quoted string>
DISP:TEXT:CLE
Display the string enclosed in quotes
Clear the displayed message
The following statement shows how to display a message on the front panel
from a Agilent Technologies controller.
‘‘DISP:TEXT ‘HELLO’ ’’
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Chapter 3 Front-Panel Operation
System-Related Operations
Firmware Revision Query
The power supply has three microprocessors for control of various internal
systems. You can query the power supply to determine which revision of
firmware is installed for each microprocessor.
• You can query the firmware revision from the remote interface only.
• The power supply returns four fields separated by commas and the fourth
field is a revision code which contains three numbers. The first number is
the firmware revision number for the main processor; the second is for the
input/output processor; and the third is for the front-panel processor.
• Remote interface operation:
3
*IDN? Returns
‘‘HEWLETT-PACKARD,E3633A,0,X.X-X.X-X.X’’ (E3633A)
‘‘HEWLETT-PACKARD,E3634A,0,X.X-X.X-X.X’’ (E3634A)
Be sure to dimension a string variable with at least 40 characters.
SCPI Language Version
The power supply complies with the rules and regulations of the present
version of SCPI (Standard Commands for Programmable Instruments). You
can determine the SCPI version with which the power supply is in compliance
by sending a command from the remote interface.
You can query the SCPI version from the remote interface only.
• Remote interface operation:
SYST:VERS?
Query the SCPI version
Returns a string in the form “YYYY.V” where the “Y’s” represent the year of the
version, and the “V” represents a version number for that year (for example,
1996.0).
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Chapter 3 Front-Panel Operation
Remote Interface Configuration
Remote Interface Configuration
Before you can operate the power supply over the remote interface, you must
configure the power supply for the remote interface. This section gives
information on configuring the remote interface. For additional information
on programming the power supply over the remote interface, See "Remote
Remote Interface Selection
The power supply is shipped with both a GPIB (IEEE-488) interface and an RS-
232 interface on the rear panel. Only one interface can be enabled at a time.
The GPIB interface is selected when the power supply is shipped from the
factory.
The remote interface can be selected from the front-panel only.
• The interface selection is stored in non-volatile memory, and does not
change when power has been off or after a remote interface reset.
• If you select the GPIB interface, you must select a unique address for the
power supply. The current address is displayed momentarily on the front
panel when you turn on the power supply.1
• Your GPIB bus controller has its own address. Be sure to avoid using the
bus controller’s address for any instrument on the interface bus. Agilent
Technologies controllers generally use address “21”.
• If you enable the RS-232 interface, you must select the baud rate and parity
to be used. “RS-232” is displayed momentarily on the front panel when you
turn on the power supply if you have selected this interface.2
on connecting the power supply to a computer over the GPIB interface.
on connecting the power supply to a computer over the RS-232 interface.
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Chapter 3 Front-Panel Operation
Remote Interface Configuration
GPIB Address
Each device on the GPIB (IEEE-488) interface must have a unique address.
You can set the power supply’s address to any value between 0 and 30. The
current address is displayed momentarily on the front panel when you turn on
the power supply. The address is set to “05” when the power supply is shipped
from the factory.
The GPIB address can be set from the front-panel only.
• The address is stored in non-volatile memory, and does not change when
power has been off or after a remote interface reset.
• Your GPIB bus controller has its own address. Be sure to avoid the bus
controller’s address for any instrument on the interface bus. Agilent
Technologies controllers generally use address “21”.
3
Baud Rate Selection (RS-232)
You can select one of six baud rates for RS-232 operation. The rate is set to
9600 baud when the power supply is shipped from the factory.
The baud rate can be set from the front-panel only.
• Selectone ofthe following:300, 600, 1200, 2400, 4800, 9600 baud. The factory
setting is 9600 baud.
• The baud rate selection is stored in non-volatile memory, and does not
change when power has been off or after a remote interface reset.
Parity Selection (RS-232)
You can select the parity for RS-232 operation. The power supply is configured
for no parity and 8 data bits when shipped from the factory.
The parity can be set from the front-panel only.
• Select one of the following: None (8 data bits, factory setting), Even (7 data
bits), or Odd (7 data bits). When you set the parity, you are indirectly setting
the number of data bits.
• The parity selection is stored in non-volatile memory, and does not change
when power has been off or after a remote interface reset.
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Chapter 3 Front-Panel Operation
Remote Interface Configuration
To Set the GPIB Address
To configure the power supply for the GPIB interface, proceed as follows:
I/O
Config
1 Turn on the remote configuration mode.
GPIB / 488
You will see the above message on the front-panel display if the power supply
has not been changed from the factory setting. If “RS-232” appears, choose
“GPIB / 488” by turning the knob to the right.
I/O
Config
2 Move to the GPIB address setting mode.
ADDR
05
The address is set to “05” when the power supply is shipped from the factory.
Notice that a different GPIB address may appear if the power supply has been
changed from the factory setting.
3 Turn the knob to change the GPIB address.
The displayed address is changed when turning the knob to the right or left.
I/O
Config
4 Save the change and turn off the I/O configuration mode.
CHANGE SAVED
Theaddressisstoredinnon-volatilememory,anddoesnotchangewhenpower
has been off or after a remote interface reset. The power supply displays a
message to show that the change is now in effect. If the GPIB address is not
changed, “NO CHANGE” will be displayed for one second.
N o t e
To exit the I/O configuration mode without any further changes, press the “I/O
Config” key until the “NO CHANGE” message is displayed.
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Chapter 3 Front-Panel Operation
Remote Interface Configuration
To Set the Baud Rate and Parity (RS-232)
To configure the power supply for the RS-232 interface, proceed as follows:
I/O
Config
1 Turn on the remote configuration mode.
GPIB / 488
You will see the above message on the display if the power supply has not been
changed from the factory setting.
Notice that if you changed the remote interface selection to RS-232 before,
“RS-232” message will be displayed.
3
2 Choose the RS-232 interface.
RS-232
You can choose the RS-232 interface by turning the knob to the left.
I/O
Config
3 Move to the RS-232 interface setting mode and select the baud rate.
9600 BAUD
The rate is set to 9600 baud when the power supply is shipped from the factory.
Choose from one of the following by turning the knob to the right or left: 300,
600, 1200, 2400, 4800, or 9600 baud.
I/O
Config
4 Save the change and choose the parity.
NONE 8 BITS
The power supply is configured for 8 data bits with no parity when shipped
from the factory. Choose from one of the following by turning the knob to the
right or left: None 8 Bits, Odd 7 Bits, or Even 7 Bits. When you set parity, you
are indirectly setting the number of the data bits.
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Chapter 3 Front-Panel Operation
Remote Interface Configuration
I/O
Config
5 Save the change and turn off the I/O configuration mode.
CHANGE SAVED
The RS-232 baud rate and parity selections are stored in non-volatile memory,
and does not change when power has been off or after a remote interface reset.
The power supply displays a message to show that the change is now in effect.
Ifthe baudrateand theparity are notchanged, “NOCHANGE”willbe displayed
for one second.
N o t e
To exit the I/O configuration mode without any further changes, press the “I/O
Config” key until the “NO CHANGE” message is displayed.
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Chapter 3 Front-Panel Operation
GPIB Interface Configuration
GPIB Interface Configuration
The GPIB connector on the rear panel connects your power supply to the
computer and other GPIB devices. Chapter 1 lists the cables that are available
from Agilent Technologies. A GPIB system can be connected together in any
configuration (star, linear, or both) as long as the following rules are observed:
• The total number of devices including the computer is no more than 15.
• The total length of all the cables used is no more than 2 meter times the
number of devices connected together, up to a maximum of 20 meters.
3
N o t e
IEEE-488 states that you should exercise caution if your individual cable lengths
exceed 4 meters.
Do not stack more than three connector blocks together on any GPIB
connector. Make sure that all connectors are fully seated and that the lock
screws are firmly finger tightened.
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Chapter 3 Front-Panel Operation
RS-232 Interface Configuration
RS-232 Interface Configuration
You connect the power supply to the RS-232 interface using the 9-pin (DB-9)
serial connector on the rear panel. The power supply is configured as a DTE
(Data Terminal Equipment) device. For all communications over the RS-232
interface, the power supply uses two handshake lines: DTR (Data Terminal
Ready, on pin 4) and DSR (Data Set Ready, on pin 6).
The following sections contain information to help you use the power supply
over the RS-232 interface. The programming commands for RS-232 are
RS-232 Configuration Overview
Configure the RS-232 interface using the parameters shown below. Use the
front-panel key to select the baud rate, parity, and number of data bits
I/O
Config
• Baud Rate: 300, 600, 1200, 2400, 4800, or 9600 baud (factory setting)
• Parity and Data Bits: None / 8 data bits (factory setting)
Even / 7 data bits, or
Odd / 7 data bits
• Number of Start Bits: 1 bit (fixed)
• Number of Stop Bits: 2 bits (fixed)
RS-232 Data Frame Format
A character frame consists of all the transmitted bits that make up a single
character. The frame is defined as the characters from the start bit to the last
stop bit, inclusively. Within the frame, you can select the baud rate, number of
data bits, and parity type. The power supply uses the following frame formats
for seven and eight data bits.
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Chapter 3 Front-Panel Operation
RS-232 Interface Configuration
Connection to a Computer or Terminal
To connect the power supply to a computer or terminal, you must have the
properinterfacecable. MostcomputersandterminalsareDTE(DataTerminal
Equipment) devices. Since the power supply is also a DTE device, you must
use a DTE-to-DTE interface cable. These cables are also called null-modem,
modem-eliminator, or crossover cables.
The interface cable must also have the proper connector on each end and the
internal wiring must be correct. Connectors typically have 9 pins (DB-9
connector) or 25 pins (DB-25 connector) with a “male” or “female” pin
configuration. A male connector has pins inside the connector shell and a
female connector has holes inside the connector shell.
3
If you cannot find the correct cable for your configuration, you may have to
use a wiring adapter. If you are using a DTE-to-DTE cable, make sure the
adapter is a “straight-through” type. Typicaladapters include gender changers,
null-modem adapters, and DB-9 to DB-25 adapters.
The cable and adapter diagrams shown below can be used to connect the
power supply to most computers or terminals. If your configuration is different
than those described, order the Agilent 34399A Adapter Kit. This kit contains
adapters for connection to other computers, terminals, and modems.
Instructions and pin diagrams are included with the adapter kit.
DB-9 Serial Connection If your computer or terminal has a 9-pin serial
port with a male connector, use the null-modem cable included with the
Agilent 34398A Cable Kit. This cable has a 9-pin female connector on each
end. The cable pin diagram is shown below.
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Chapter 3 Front-Panel Operation
RS-232 Interface Configuration
DB-25 Serial Connection If your computer or terminal has a 25-pin serial
port with a male connector, use the null-modem cable and 25-pin adapter
included with the Agilent 34398A Cable Kit. The cable and adapter pin
diagram are shown below.
DTR / DSR Handshake Protocol
The power supply is configured as a DTE (Data Terminal Equipment) device
and uses the DTR (Data Terminal Ready) and DSR (Data Set Ready) lines of
the RS-232 interface to handshake. The power supply uses the DTR line to send
a hold-off signal. The DTR line must be TRUE before the power supply will
accept data from the interface. When the power supply sets the DTR line
FALSE, the data must cease within 10 characters.
To disable the DTR/DSR handshake, do not connect the DTR line and tie the
DSR line to logic TRUE. If you disable the DTR/DSR handshake, also select a
slower baud rate to ensure that the data is transmitted correctly.
The power supply sets the DTR line FALSE in the following two cases:
1 When the power supply’s input buffer is full (when approximately 100
characters have been received), it sets the DTR line FALSE (pin 4 on the RS-
232 connector). When enough characters have been removed to make space
in the input buffer, the power supply sets the DTR line TRUE, unless the
second case (see next) prevents this.
2 When the power supply wants to “talk” over the interface (which means that
it has processed a query) and has received a <new line> message terminator,
it will set the DTR line FALSE. This implies that once a query has been sent to
the power supply, the bus controller should read the response before
attempting to send more data. It also means that a <new line> must terminate
the command string. After the response has been output, the power supply sets
the DTR line TRUE again, unless the first case (see above) prevents this.
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Chapter 3 Front-Panel Operation
RS-232 Interface Configuration
The power supply monitors the DSR line to determine when the bus controller
is ready to accept data over the interface. The power supply monitors the DSR
line (pin 6 on the RS-232 connector) before each character is sent. The output
is suspended if the DSR line is FALSE. When the DSR line goes TRUE,
transmission will resume.
The power supply holds the DTR line FALSE while output is suspended. A form
of interface deadlock exists until the bus controller asserts the DSR line TRUE
to allow the power supply to complete the transmission. You can break the
interface deadlock by sending the <Ctrl-C> character, which clears the
operation in progress and discards pending output (this is equivalent to the
IEEE-488 device clear action).
3
For the <Ctrl-C> character to be recognized reliably by the power supply
while it holds DTR FALSE, the bus controller must first set DSR FALSE.
RS-232 Troubleshooting
Here are a few things to check if you are having problems communicating over
the RS-232 interface. If you need additional help, refer to the documentation
that came with your computer.
• Verify that the power supply and your computer are configured for the same
baud rate, parity, and number of data bits. Make sure that your computer is
set up for 1 start bit and 2 stop bits (these values are fixed on the power
supply).
• Make sure to execute the SYSTem:REMote command to place the power
supply in the remote mode.
• Verify that you have connected the correct interface cable and adapters.
Even if the cable has the proper connectors for your system, the internal
wiring may be incorrect. The Agilent 34398A Cable Kit can be used to
connect the power supply to most computers or terminals.
• Verify that you have connected the interface cable to the correct serial port
on your computer (COM1, COM2, etc).
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Chapter 3 Front-Panel Operation
Calibration Overview
Calibration Overview
This section gives an overview of the calibration features of the power supply.
For more detailed discussion of the calibration procedures, see the Service
Guide.
Calibration Security
This feature allows you to enter a security code to prevent accidental or
unauthorized calibrations of the power supply. When you first receive your
power supply, it is secured. Before you can calibrate the power supply, you
must unsecure it by entering the correct security code.
• The security code is set to “HP003633”* or “HP003634”** when the power
supply is shipped from the factory. The security code is stored in non-
volatile memory, and does not change when power has been off or after a
remote interface reset.
• To secure the power supply from the remote interface, the security code
may contain up to 12 alphanumeric characters as shown below. The first
character must be a letter, but the remaining characters can be letters or
numbers. You do not have to use all 12 characters but the first character
must always be a letter.
A _ _ _ _ _ _ _ _ _ _ _ (12 characters)
• To secure the power supply from the remote interface so that it can be
unsecured from the front panel, use the eight-character format shown
below. The first two characters must be “H P” and the remaining characters
must be numbers. Only the last six characters are recognized from the front
panel, but all eight characters are required.
To unsecure the power supply from the front panel, omit the “H P” and enter
the remaining numbers as shown on the following pages.
H P_ _ _ _ _ _ (6 characters)
If you forget your security code, you can disable the security feature by
adding a jumper inside the power supply, and then entering a new code.
See the Service Guide for more information.
*For Agilent E3633A Model **For Agilent E3634A Model
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Chapter 3 Front-Panel Operation
Calibration Overview
To Unsecure for Calibration You can unsecure the power supply for
calibration either from the front panel or over the remote interface.
The power supply is secured when shipped from the factory, and the security
code is set to “HP003633”* or “HP003634”**
• Front-Panel Operation:
SECURED
If the power supply is secured, you will see the above message for one second
by holding
Error
(Calibrate) key for 5 seconds when you turn on the power
(Secure) key after the
supply. To uCnalsiberacteure the power supply, press
“CAL MODE” message is displayed in the calibration mode, enter the security
I/O
Config
3
Secure
I/O
Config
code using the knob and resolution selection keys, and then press the
(Secure) key.
Secure
000000 CODE
I/O
Config
When you press
(Secure) key to save the change, you will see the
Secure
message below for one second if the security code is correct. The unsecured
setting is stored in non-volatile memory, and does not change when power has
been off or after a remote interface reset. To exit the calibration mode, turn
the power off and on.
UNSECURED
Notice that if the security is incorrect, the power supply displays an
“INVALID” message for a second and returns to the code entering mode for
you to enter the correct code.
• Remote Interface Operation:
CAL:SEC:STAT {OFF|ON},<code> Secure or unsecure the power supply
To unsecure the power supply, send the above command with the same code
used to secure. For example,
‘‘CAL:SEC:STAT OFF, HP003633’’ (E3633A)or
‘‘CAL:SEC:STAT OFF, HP003634’’ (E3634A)
*For Agilent E3633A Model **For Agilent E3634A Model
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Chapter 3 Front-Panel Operation
Calibration Overview
To Secure Against Calibration You can secure the power supply against
calibration either from the front panel or over the remote interface. The power
supply is secured when shipped from the factory, and the security code is set
to “HP003633”* or “HP003634”**.
the power supply.
• Front-Panel Operation:
UNSECURED
If the power supply is unsecured, you will see the above message for one
second by holding
Error
(Calibrate) key for 5 seconds when you turn on the
(Secure) key after the
power supply. To seCcaulibrraete the power supply, press
“CAL MODE” message is displayed in the calibration mode, enter the security
I/O
Config
Secure
I/O
Config
code using the controlknobandresolutionselectionkeys, andthenpress
(Secure) key.
Secure
Notice that you should omit the “HP” and enter the remaining numbers as
shown below.
000000 CODE
I/O
Config
When you press
(Secure) key to save the change, you will see the
Secure
message below. The secured setting isstored in non-volatilememory, and does
not change when power has been off or after a remote interface reset. To exit
the calibration mode, turn the power off and on.
SECURED
• Remote Interface Operation:
CAL:SEC:STAT {OFF|ON},<code> Secure or unsecure the power supply
To secure the power supply, send the above command with the same code as
used to unsecure. For example,
‘‘CAL:SEC:STAT ON, HP003633’’ (E3633A) or
‘‘CAL:SEC:STAT ON, HP003634’’ (E3634A)
*For Agilent E3633A Model **For Agilent E3634A Model
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Chapter 3 Front-Panel Operation
Calibration Overview
To Change the Security Code To change the security code, you must first
unsecure the power supply, and then enter a new code.
the power supply.
• Front-Panel Operation:
To change the security code, first make sure that the power supply is
unsecured. Press
I/O
Config
(Secure) key after the “CAL MODE” message is
displayed in the calSibecruaretion mode, enter the new security code using the control
knob and resolution selection keys, then press
I/O
Config
(Secure) key.
Secure
Changing the code from the front panel also changes the code required from
the remote interface.
3
• Remote Interface Operation:
CAL:SEC:CODE <new code>
Change the security code
To change the security code, first unsecure the power supply using the old
security code. Then, enter the new code. For example,
‘‘CAL:SEC:STAT OFF, HP003633*or HP003634**’’ Unsecure withold code
‘‘CAL:SEC:CODE ZZ001443’’
Enter new code
‘‘CAL:SEC:STAT ON, ZZ001443’’
Secure with new code
*For Agilent E3633A Model **For Agilent E3634A Model
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Chapter 3 Front-Panel Operation
Calibration Overview
Calibration Count
You can determine the number of times that your power supply has been
calibrated. Your power supply was calibrated before it left the factory. When
you receive your power supply, read the count to determine its initial value.
The calibration count feature can be performed from the remote interface
only.
• The calibration countisstoredinnon-volatile memory, anddoes notchange
when power has been off or after a remote interface reset.
• The calibration count increments up to a maximum of 32,767 after which it
wraps-around to 0. Since the value increments by one for each calibration
point, a complete calibration will increase the value by 5 counts.
• Remote Interface Operation:
CAL:COUN?
Query the number of times of calibration
Calibration Message
You can use the calibration message feature to record calibration information
about your power supply. For example, you can store such information as the
last calibration date, the next calibration due date, the power supply’s serial
number, or even the name and phone number of the person to contact for a
new calibration.
You can record and read information in the calibration message from the
remote interface only.
• The power supply should be unsecured before sending a calibration
message.
• The calibration message may contain up to 40 characters.
• The calibration message is stored in non-volatile memory, and does not
change when power has been off or after a remote interface reset.
• Remote Interface Operation:
CAL:STR <quoted string>
Store the cal message
The following command string shows how to store a calibration message.
‘‘CAL:STR ‘CAL 12-05-98’ ’’
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Remote Interface Reference
• SCPI Command Summary, starting on page 75
• Simplified Programming Overview, starting on page 80
• Using the APPLy Command, on page 83
SCPI
• Output Setting and Operation Commands, on page 84
• Triggering Commands, starting on page 91
• System-Related Commands, starting on page 94
• Calibration Commands, starting on page 98
• RS-232 Interface Commands, on page 101
• The SCPI Status Registers, starting on page 102
• Status Reporting Commands, starting on page 110
• An Introduction to the SCPI Language, starting on page 113
• Halting an Output in Progress, on page 118
SCPI
• SCPI Conformance Information, starting on page 119
• IEEE-488 Conformance Information, on page 122
If you are a first-time user of the SCPI language, you may want to refer to
these sections to become familiar with the language before attempting to
program the power supply.
SCPI
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Chapter 4 Remote Interface Reference
SCPI Command Summary
SCPI Command Summary
This section summarizes the SCPI (Standard Commands for Programmable
Instruments) commands available to program the power supply over the
remote interface. Refer to the later sections in this chapter for more complete
details on each command.
Throughout this manual, the following conventions are used for SCPI
command syntax.
• Square brackets ([ ]) indicate optional keywords or parameters.
• Braces ({ }) enclose parameters within a command string.
• Triangle brackets (< >) indicate that you must substitute a value or a code
for the enclosed parameter.
• A vertical bar ( | ) separates one of two or more alternative parameters.
4
SCPI
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Chapter 4 Remote Interface Reference
SCPI Command Summary
Output Setting and Measurement Commands
APPLy {<voltage>|DEF|MIN|MAX}[,{<current>|DEF|MIN|MAX}]
APPLy?
[SOURce:]
CURRent[:LEVel][:IMMediate][:AMPLitude]{<current>|MIN|MAX|UP|DOWN}
CURRent[:LEVel][:IMMediate][:AMPLitude]? [MIN|MAX]
CURRent[:LEVel][:IMMediate]:STEP[:INCRement]
{<numeric value> |DEFault}
CURRent[:LEVel][:IMMediate]:STEP[:INCRement]? {DEFault}
CURRent[:LEVel]:TRIGgered[:AMPLitude] {<current>|MIN|MAX}
CURRent[:LEVel]:TRIGgered[:AMPLitude]? [MIN|MAX]
CURRent:PROTection[:LEVel] {<current>|MIN|MAX}
CURRent:PROTection[:LEVel]? {MIN|MAX}
CURRent:PROTection:STATe {0|1|OFF|ON}
CURRent:PROTection:STATe?
CURRent:PROTection:TRIPped?
CURRent:PROTection:CLEar
VOLTage[:LEVel][:IMMediate][:AMPLitude]
{<voltage>|MIN|MAX|UP|DOWN}
VOLTage[:LEVel][:IMMediate][:AMPLitude]? [MIN|MAX]
VOLTage[:LEVel][:IMMediate]:STEP[:INCRement]
{<numeric value>|DEFault}
VOLTage[:LEVel][:IMMediate]:STEP[:INCRement]? {DEFault}
VOLTage[:LEVel]:TRIGgered[:AMPLitude] {<voltage>|MIN|MAX}
VOLTage[:LEVel]:TRIGgered[:AMPLitude]? [MIN|MAX]
VOLTage:PROTection[:LEVel] {<voltage>|MIN|MAX}
VOLTage:PROTection[:LEVel]? {MIN|MAX}
VOLTage:PROTection:STATe {0|1|OFF|ON}
VOLTage:PROTection:STATe?
VOLTage:PROTection:TRIPped?
VOLTage:PROTection:CLEar
VOLTage:RANGe {P8V*|P20V*|P25V**|P50V**|LOW|HIGH}
VOLTage:RANGe?
MEASure
:CURRent[:DC]?
[:VOLTage][:DC]?
*For Agilent E3633A Model **For Agilent E3634A Model
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Chapter 4 Remote Interface Reference
SCPI Command Summary
Triggering Commands
INITiate[:IMMediate]
TRIGger[:SEQuence]
:DELay {<seconds>|MIN|MAX}
:DELay?
:SOURce {BUS|IMM}
:SOURce?
*TRG
System-Related Commands
DISPlay[:WINDow]
[:STATe] {OFF|ON}
[:STATe]?
4
:TEXT[:DATA] <quoted string>
:TEXT[:DATA]?
:TEXT:CLEar
SYSTem
:BEEPer[:IMMediate]
:ERRor?
:VERSion?
OUTPut
:RELay[:STATe] {OFF|ON}
:RELay[:STATe]?
[:STATe] {OFF|ON}
[:STATe]?
*IDN?
*RST
*TST?
*SAV {1|2|3}
*RCL {1|2|3}
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Chapter 4 Remote Interface Reference
SCPI Command Summary
Calibration Commands
CALibration
:COUNt?
:CURRent[:DATA] <numeric value>
:CURRent:LEVel {MIN|MID|MAX}
:CURRent:PROTection
:DAC:ERRor
:SECure:CODE <new code>
:SECure:STATe {OFF|ON},<code>
:SECure:STATe?
:STRing <quoted string>
:STRing?
:VOLTage[:DATA] <numeric value>
:VOLTage:LEVel {MIN|MID|MAX}
:VOLTage:PROTection
Status Reporting Commands
STATus:QUEStionable
:CONDition?
[:EVENt]?
:ENABle <enable value>
:ENABle?
SYSTem:ERRor?
*CLS
*ESE <enable value>
*ESE?
*ESR?
*OPC
*OPC?
*PSC {0|1}
*PSC?
*SRE <enable value>
*SRE?
*STB?
*WAI
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Chapter 4 Remote Interface Reference
SCPI Command Summary
RS-232 Interface Commands
SYSTem
:LOCal
:REMote
:RWLock
IEEE-488.2 Common Commands
*CLS
*ESR?
*ESE <enable value>
*ESE?
*IDN?
*OPC
*OPC?
4
*PSC {0|1}
*PSC?
*RST
*SAV {1|2|3}
*RCL {1|2|3}
*STB?
*SRE <enable value>
*SRE?
*TRG
*TST?
*WAI
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Chapter 4 Remote Interface Reference
Simplified Programming Overview
Simplified Programming Overview
This section gives an overview of the basic techniques used to program the
power supply over the remote interface. This section is only an overview and
does not give all of the details you will need to write your own application
programs. Refer to the remainder of this chapter and also chapter 6,
“Application Programs”, for more details and examples. Also refer to the
programming reference manual that came with your computer for details on
outputting command strings and entering data.
Using the APPLy Command
The APPLycommand provides the most straightforward method to program
the power supply over the remote interface. For example, the following
statement executed from your computer will set the power supply to an output
of 3 V rated at 1 A:
‘‘APPL 3.0, 1.0’’
Using the Low-Level Commands
Although the APPLycommand provides the most straightforward method to
program the power supply, the low-level commands give you more flexibility
to change individual parameters. For example, the following statements
executed from your computer will set the power supply to an output of 3 V
rated at 1 A:
‘‘VOLT 3.0’’
‘‘CURR 1.0’’
Set output voltage to 3.0 V
Set output current to 1.0 A
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Chapter 4 Remote Interface Reference
Simplified Programming Overview
Reading a Query Response
Only the query commands (commands that end with “ ? ” ) will instruct the
power supply to send a response message. Queries return either output values
or internal instrument settings. For example, the following statements
executed from your computer will read the power supply’s error queue and
print the most recent error:
dimension statement
‘‘SYST:ERR?’’
Dimension string array (80 elements)
Read error queue
bus enter statement
print statement
Enter error string into computer
Print error string
Selecting a Trigger Source
The power supply will accept a ‘‘bus’’ (software) trigger or an immediate
internal trigger as a trigger source. By default, the ‘‘BUS’’ trigger source is
selected. If you want the power supply to use an immediate internal trigger,
you must select ‘‘IMMediate’’. For example, the following statements
executed from your computer will set to an output of 3 V/1 A immediately:
4
‘‘VOLT:TRIG 3.0’’
‘‘CURR:TRIG 1.0’’
‘‘TRIG:SOUR IMM’’
‘‘INIT’’
Set the triggered voltage level to 3.0 V
Set the triggered current level to 1.0 A
Select the immediate trigger as a source
Cause the trigger system to initiate
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Chapter 4 Remote Interface Reference
Simplified Programming Overview
Power Supply Programming Ranges
The SOURce subsystem requires parameters for programming values. The
available programming value for a parameter varies according to the desired
output range of the power supply. The following table lists the programming
values available and MINimum, MAXimum, DEFault and reset values of the
Agilent E3633A and E3634A power supplies.
Refer to this table to identify programming values when programming the power
supply.
Table 4-1. Agilent E3633A Programming Ranges
0 - 8V/20A Range
0 - 20V/10A Range
Voltage
Programming Range
MAX Value
0 V to 8.24V
8.24 V
0 V
0 V to 20.60 V
20.60 V
0 V
MIN Value
DEFault Value
*RST Value
0 V
0 V
0 V
Current
Programming Range
MAX Value
0 A to 20.60 A
20.60 A
0 A
0 A to 10.30 A
10.30 A
0 A
MIN Value
DEFault Value
*RST Value
20 A
10 A
20.00 A
Table 4-2. Agilent E3634A Programming Ranges
0 - 25V/7A Range
0 - 50V/4A Range
Voltage
Programming Range
MAX Value
0 V to 25.75V
25.75 V
0 V
0 V to 51.5 V
51.5 V
0 V
MIN Value
DEFault Value
*RST Value
0 V
0 V
0 V
Current
Programming Range
MAX Value
0 A to 7.21 A
7.21 A
0 A
0 A to 4.12 A
4.12 A
0 A
MIN Value
DEFault Value
*RST Value
7.0 A
4.0 A
7.00 A
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Chapter 4 Remote Interface Reference
Using the APPLy Command
Using the APPLy Command
The APPLy command provides the most straightforward method to program
the power supply over the remote interface. You can select the output voltage
and current in one command.
APPLy {<voltage>| DEF | MIN | MAX}[,{<current>| DEF | MIN | MAX}]
This command is combination of VOLTage and CURRent commands. As long
as the newly programmed values are within the presently selected range, the
output voltage and current are changed as soon as the command is executed.
The APPLy command changes the power supply’s output to the newly
programmed values only if the programmed values are valid within the
presently selected range. An execution error will occur if the programmed
values are not valid within the selected range.
You can substitute ‘‘MINimum’’, ‘‘MAXimum’’, or ‘‘DEFault’’ in place of a
specific value for the voltage and current parameters. MIN selects the lowest
values of ‘‘0’’ volts and ‘‘0’’ amps. MAX selects the highest values allowed for
the selected range.
4
The default values of voltage and current are ‘‘0’’ volts and ‘‘20’’* or ‘‘7’’** amps
regardless of the presently selected range. For more details of parameters, see
Table 4-1 for the Agilent E3633A model and Table 4-2 for the Agilent E3634A
model.
If you specify only one parameter of the APPLy command, the power supply
regards it as voltage setting value.
APPLy?
This command queries the power supply’s present voltage and current setting
values and returns a quoted string. The voltage and current are returned in
sequence as shown in the sample string below (the quotation marks are
returned as part of the string).
‘‘8.00000,20.00000’’* or ‘‘25.00000,7.00000’’**
In the above string, the first number 8.00000 is the voltage setting value and
the second number 20.00000 is the current setting value.
*For Agilent E3633A Model **For Agilent E3634A Model
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Chapter 4 Remote Interface Reference
Output Setting and Operation Commands
Output Setting and Operation Commands
This section describes low-level commands used to program the power supply.
Although the APPLy command provides the most straightforward method to
program the power supply, the low-level output setting commands give you
more flexibility to change the individual parameters.
CURRent{<current>|MINimum | MAXimum|UP|DOWN}
This command programs the immediate current level of the power supply. The
immediate level is the current value of the output terminals.
The CURRent command changes the output of the power supply to the newly
programmed value regardless of the output range presently selected.
You can substitute ‘‘MINimum’’ or ‘‘MAXimum’’ in place of a specific value for
the current parameter. MIN selects the lowest current values of ‘‘0’’ amps. MAX
selects the highest current values allowed for the selected range.
This command also increases or decreases the immediate current level using
the ‘‘UP’’ or ‘‘DOWN’’ parameter by a predetermined amount. The command
CURRent:STEP sets the amount of increase or decrease. Notice that a new
increment setting will cause an execution error -222 (Data out of range) when
the maximum or the minimum rated current is exceeded.
CURRent
Example
The following program segments show how to use the CURR UP or
CURR DOWN command to increase or decrease the output current with the
CURR:STEP command.
‘‘CURR:STEP 0.01’’
‘‘CURR UP’’
Set the step size to 0.01 A
Increase the output current
Set the step size to 0.02 A
Decrease the output current
‘‘CURR:STEP 0.02’’
‘‘CURR DOWN’’
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Chapter 4 Remote Interface Reference
Output Setting and Operation Commands
CURRent? [MINimum | MAXimum]
This query returns the presently programmed current level of the power
supply. CURR?MAXand CURR? MINreturn the highest and lowest
programmable current levels for the selected range.
CURRent:STEP {<numeric value>|DEFault}
This command sets the step size for current programming with the CURRent
UPand CURRentDOWNcommands. See the example in the previous page.
To set the step size to the minimum resolution, set the step size to ‘‘DEFault’’.
The minimum resolution of the step size is approximately 0.32 mA (E3633A)
and 0.13 mA (E3634A) respectively. The CURR:STEP? DEFreturns the
minimum resolutionofyourinstrument. Theimmediatecurrentlevelincreases
or decreases by the value of the step size. For example, the output current will
increase or decrease 10 mA if the step size is 0.01.
This command is useful when you program the power supply to the allowed
minimum resolution. At *RST, the step size is the value of the minimum
resolution.
4
CURRent:STEP? {DEFault}
This query returns the value of the step size currently specified. The returned
parameter is a numeric value. ‘‘DEFault’’ gives the minimum resolution of the
step size in unit of amps.
CURRent:TRIGgered {<current>| MINimum | MAXimum}
This command programs the pending triggered current level. The pending
triggered current level is a stored value that is transferred to the output
terminals when a trigger occurs. A pending triggered level is not affected by
subsequent CURRentcommands.
CURRent:TRIGgered? [MINimum | MAXimum]
This query returns the triggered current level presently programmed. If no
triggered level is programmed, the CURRentlevel is returned. CURR
:TRIG? MAXand CURR:TRIG? MINreturn the highest and lowest
programmable triggered current levels.
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Chapter 4 Remote Interface Reference
Output Setting and Operation Commands
CURRent:PROTection {<current>|MINimum|MAXimum}
This command sets the current level at which the overcurrent protection
(OCP) circuit will trip. If the peak output current exceeds the OCP level, then
the output current is programmed to zero. The Questionable Status register
the CURR:PROT:CLEcommand after the condition that caused the OCP trip
is removed.
CURRent:PROTection? {MINimum|MAXimum}
This query returns the overcurrent protection trip level presently programmed.
CURR:PROT? MAXand CURR:PROT? MINreturn the maximum and minimum
programmable overcurrent trip levels.
CURRent:PROTection:STATe {0|1|OFF|ON}
This command enables or disables the overcurrent protection function of the
power supply. An overcurrent condition can be cleared with the
CURR:PROT:CLEcommand after the condition that caused the OCP trip is
removed. At *RST, this value is set to ‘‘ON’’.
CURRent:PROTection:STATe?
This query returns the state of the overcurrent protection function. The
returned parameter is ‘‘0’’ (OFF) or ‘‘1’’ (ON).
CURRent:PROTection:TRIPped?
This query returns a ‘‘1’’ if the overcurrent protection circuit is tripped and not
cleared or a ‘‘0’’ if not tripped.
CURRent:PROTection:CLEar
This command causes the overcurrent protection circuit to be cleared. After
this command, the output current is restored to the state it was in before the
current protection tripped and the OCP trip level remains unchanged to the
value presently programmed. Before sending this command, lower the output
current below the trip OCP point, or raise the OCP trip level above the output
setting. Note that the overcurrent condition caused by an external source
must be removed first before proceeding this command.
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Chapter 4 Remote Interface Reference
Output Setting and Operation Commands
VOLTage {<voltage>| MINimum | MAXimum|UP|DOWN}
This command programs the immediate voltage level of the power supply. The
immediate level is the voltage value of the output terminals.
The VOLTagecommand changes the output of the power supply to the newly
programmed value regardless of the output range presently selected.
You can substitute ‘‘MINimum’’ or ‘‘MAXimum’’ in place of a specific value for
the voltage parameter. MINselects the lowest voltage values of ‘‘0’’ volts. MAX
selects the highest voltage values allowed for the selected range.
This command also increases or decreases the immediate voltage level using
the ‘‘UP’’ or ‘‘DOWN’’ parameter by a predetermined amount. The command
VOLTage:STEPsets the amount of increase or decrease. Notice that a new
increment setting will cause an execution error -222 (Data out of range) when
the maximum or the minimum rated voltage is exceeded.
VOLTage
Example
The following program segments show how to use the VOLT UPor
VOLT DOWNcommand to increase or decrease the output voltage with the
VOLT:STEPcommand.
4
‘‘VOLT:STEP 0.01’’
‘‘VOLT UP’’
Set the step size to 0.01 V
Increase the output voltage
Set the step size to 0.02 V
Decrease the output voltage
‘‘VOLT:STEP 0.02’’
‘‘VOLT DOWN’’
VOLTage? [MINimum | MAXimum]
This query returns the presently programmed voltage level of the power
supply. VOLT? MAXand VOLT? MINreturn the highest and lowest
programmable voltage levels for the selected range.
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Chapter 4 Remote Interface Reference
Output Setting and Operation Commands
VOLTage:STEP {<numeric value>|DEFault}
This command sets the step size for voltage programming with the VOLT UP
and VOLT DOWNcommands. See the above example in the previous page.
To set the step size to the minimum resolution, set the step size to ‘‘DEFault’’.
The minimum resolution of the step size is approximately 0.36 mV (E3633A)
and 0.95 mV (E3634A) respectively. The VOLT:STEP? DEFreturns the
minimumresolution ofyour instrument. The immediate voltage levelincreases
or decreases by the value of the step size. For example, the output voltage will
increase or decrease 10 mV if the step size is 0.01.
This command is useful when you program the power supply to the allowed
minimum resolution. At *RST, the step size is the value of the minimum
resolution.
VOLTage:STEP? {DEFault}
This query returns the value of the step size currently specified. The returned
parameter is a numeric value. ‘‘DEFault’’ gives the minimum resolution step
size in unit of volts.
VOLTage:TRIGgered {<voltage>| MINimum | MAXimum}
This command programs the pending triggered voltage level. The pending
triggered voltage level is a stored value that is transferred to the output
terminals when a trigger occurs. A pending triggered level is not affected by
subsequent VOLTagecommands.
VOLTage:TRIGgered? [MINimum | MAXimum]
This query returns the triggered voltage level presently programmed. If no
triggered level is programmed, the VOLTlevel is returned. VOLT:TRIG? MAX
and VOLT:TRIG? MINreturn the highest and lowest programmable triggered
voltage levels.
VOLTage:PROTection {<voltage>|MINimum|MAXimum}
This command sets the voltage levelatwhich the overvoltage protection (OVP)
circuit will trip. If the peak output voltage exceeds the OVP level, then the
power supply output is shorted by an internal SCR. The Questionable Status
with the VOLT:PROT:CLEcommand after the condition that caused the OVP
trip is removed.
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Chapter 4 Remote Interface Reference
Output Setting and Operation Commands
VOLTage:PROTection? {MINimum|MAXimum}
This query returns the overvoltage protection trip level presently programmed.
VOLT:PROT? MAXand VOLT:PROT? MINreturn the maximum and minimum
programmable overvoltage trip levels.
VOLTage:PROTection:STATe {0|1|OFF|ON}
This command enables or disables the overvoltage protection function. An
overvoltage condition can be cleared with the VOLT:PROT:CLEcommand
after the condition that caused the OVP trip is removed. At *RST, this value is
set to ‘‘ON’’.
VOLTage:PROTection:STATe?
This query returns the state of the overvoltage protection function. The
returned parameter is ‘‘0’’ (OFF) or ‘‘1’’ (ON).
VOLTage:PROTection:TRIPped?
This query returns a ‘‘1’’ if the overvoltage protection circuit is tripped and not
cleared or a ‘‘0’’ if not tripped.
4
VOLTage:PROTection:CLEar
This command causes the overvoltage protection circuit to be cleared. After
this command, the output voltage is restored to the state it was in before the
protection feature occurred and the OVP trip level remains unchanged to the
value presently programmed. Before sending this command, lower the output
voltage below the trip OVP point, or raise the OVP trip level above the output
setting. Notethattheovervoltageconditioncaused by anexternal sourcemust
be removed first before proceeding this command.
VOLTage:RANGe {P8V|P20V||LOW|HIGH}
or {P25V|P50V|LOW|HIGH}
(For E3633A model)
(For E3634A model)
This command selects an output range to be programmed by the identifier. For
example, when 8V/20A* range is selected, the maximum programmable
voltage and current are limited to 8.24 volts and 20.60 amps. When 20V/10A*
range is selected, the maximum programmable voltage and current are
programming ranges of the Agilent E3634A model. ‘‘P20V’’* or ‘‘HIGH’’ is the
identifier for the 20V/10A* range and ‘‘P8V’’* or ‘‘LOW’’ is for the 8V/20A* range.
At *RST, the 8V/20A* or 25V/7A** range is selected.
*For Agilent E3633A Model **For Agilent E3634A Model
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Chapter 4 Remote Interface Reference
Output Setting and Operation Commands
VOLTage:RANGe?
This query returns the currently selected range. The returned parameter for
the Agilent E3633A is ‘‘P20V’’ (HIGH) or ‘‘P8V’’ (LOW) and the parameter for
the Agilent E3634A is ‘‘P50V’’ (HIGH) or ‘‘P25V’’ (LOW).
MEASure:CURRent?
This command queries the current measured across the current sense resistor
inside the power supply.
MEASure[:VOLTage]?
This command queries the voltage measured at the sense terminals of the
power supply.
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Chapter 4 Remote Interface Reference
Triggering Commands
Triggering Commands
The power supply’s triggering system allows a change in voltage and current
when receiving a trigger, to select a trigger source, and to insert a trigger.
Triggering the power supply is a multi-step process.
• First, you must specify the source from which the power supply will accept
the trigger. The power supply will accept a bus (software) trigger or an
immediate trigger from the remote interface.
• Then, you can set the time delay between the detection of the trigger on the
specified trigger source and the start of any corresponding output change.
Notice that the time delay is valid for only the bus trigger source.
• Finally, you must provide an INITiatecommand. If the IMMediate
source is selected, the selected output is set to the triggered level
immediately. But if the trigger source is the bus, the power supply is set to
the triggered level after receiving the Group Execute Trigger (GET) o*rTRG
command.
4
Trigger Source Choices
You must specify the source from which the power supply will accept a trigger.
The trigger is stored in volatile memory; the source is set to bus when the power
supply has been off or after a remote interface reset.
Bus (Software) Triggering
• To select the bus trigger source, send the following command.
TRIG:SOUR BUS
• To trigger the power supply from the remote interface (GPIB or RS-232)
after selecting the bus source, send the *TRG(trigger) command. When the
*TRGis sent, the trigger action starts after the specified time delay if any
delay is given.
• You can also trigger the power supply from the GPIB interface by sending
the IEEE-488 Group Execute Trigger (GET) message. The following
statement shows how to send a GET from a Agilent Technologies controller.
TRIGGER 705(group execute trigger)
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Triggering Commands
• To ensure synchronization when the bus source is selected, send the *WAI
(wait) command. When the *WAIcommand is executed, the power supply
waitsforallpending operationsto completebeforeexecuting anyadditional
commands. For example, the following command string guarantees that the
first trigger is accepted and is executed before the second trigger is
recognized.
TRIG:SOUR BUS;*TRG;*WAI;*TRG;*WAI
• You can use the *OPC?(operation complete query) command or the *OPC
(operation complete) command to signal when the operation is complete.
The *OPC?command returns ‘‘1’’ to the output buffer when the operation
is complete. The *OPCcommand sets the ‘‘OPC’’ bit (bit 0) in the Standard
Event register when the operation is complete.
Immediate Triggering
• To select the immediate trigger source, send the following command.
TRIG:SOUR IMM
• When the IMMediateis selected as a trigger source, an INITiate
command immediately transfers the VOLT:TRIGor CURR:TRIGvalue to
VOLTor CURRvalue. Any delay is ignored.
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Triggering Commands
Triggering Commands
INITiate
This command causes the trigger system to initiate. This command completes
one full trigger cycle when the trigger source is an immediate and initiates the
trigger subsystem when the trigger source is bus.
TRIGger:DELay {<seconds>| MINimum | MAXimum}
This command sets the time delay between the detection of an event on the
specified trigger source and the start of any corresponding trigger action on
the power supply output. Select from 0 to 3600 seconds. MIN= 0 seconds.
MAX= 3600 seconds. At *RST, this value is set to 0 seconds.
TRIGger:DELay?
This command queries the trigger delay.
TRIGger:SOURce {BUS | IMMediate}
This command selects the source from which the power supply will accept a
trigger. The power supply will accept a bus (software) trigger or an internal
immediate trigger. At *RST, the bus trigger source is selected.
4
TRIGger:SOURce?
This command queries the present trigger source. Returns ‘‘BUS’’ or ‘‘IMM’’.
*TRG
This command generates a trigger to the trigger subsystem that has selected a
bus (software) trigger as its source (TRIG:SOUR BUS). The command has
the same effect as the Group Execute Trigger (GET) command. For RS-232
operation, make sure the power supply is in the remote interface mode by
sending the SYST:REMcommand first.
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System-Related Commands
System-Related Commands
DISPlay {OFF | ON}
This command turns the front-panel display off or on. When the display is
turned off, outputs are not sent to the display and all annunciators are disabled
except the ERROR annunciator.
The display state is automatically turned on when you return to the local mode.
Press
Store
(Local) key to return to the local state from the remote interface.
Local
DISPlay?
This command queries the front-panel display setting. Returns ‘‘0’’ (OFF) or
‘‘1’’ (ON).
DISPlay:TEXT <quoted string>
This command displays a message on the front panel. The power supply will
display up to 12 characters in a message; any additional characters are
truncated. Commas, periods, and semicolons share a display space with the
preceding character, and are not considered individual characters.
DISPlay:TEXT?
This command queries the message sent to the front panel and returns a quoted
string.
DISPlay:TEXT:CLEar
This command clears the message displayed on the front panel.
OUTPut {OFF | ON}
This command enables or disables the outputs of the power supply. When the
output is disabled, the voltage value is 0 V and the current value is 1 mA.
At *RST, the output state is OFF.
OUTPut?
Thiscommandqueriestheoutputstate ofthepower supply. The returned value
is ‘‘0’’ (OFF) or ‘‘1’’ (ON).
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System-Related Commands
OUTPut:RELay {OFF | ON}
Thiscommandsetsthe stateoftwoTTL signalsonthe RS-232 connector. These
signals are intended for use with an external relay and relay driver. The TTL
output is available on the RS-232 connector pin 1 and pin 9. When the
OUTPut:RELay state is ‘‘ON’’, the TTL output of pin 1 is high (4.5 V) and pin
9 is low (0.5 V). The levels are reversed when the OUTPut:RELay state is
‘‘OFF’’. At *RST, the OUTPut:RELay state is OFF.
N o t e
N o t e
TTL output of pin 1 or pin 9 of the RS-232 connector is available only after installing
two jumpers inside the power supply. See the Service Guide for more information.
Do not use the RS-232 interface if you have configured the power supply to output
relay control signals. Internal components on the RS-232 circuitry may be damaged.
OUTPut:RELay?
This command returns the state of the TTL relay logic signals. See also
OUTP:REL command.
4
SYSTem:BEEPer
This command issues a single beep immediately.
SYSTem:ERRor?
This command queries the power supply’s error queue. When the front-panel
ERROR annunciator turns on, one or more command syntax or hardware
errors have been detected. Up to 20 errors can be stored in the error queue.
See ‘‘Error Messages’’ for a complete listing of the errors in chapter 5.
• Errorsare retrieved infirst-in-first-out(FIFO)order. Thefirsterror returned
is the first error that was stored. When you have read all errors from the
queue, the ERROR annunciator turnsoff. The power supply beepsonce each
time an error is generated.
• If more than 20 errors have occurred, the last error stored in the queue (the
most recent error) is replaced with -350, ‘‘Too many errors’’. No additional
errors are stored until you remove errors from the queue. If no errors have
occurred when you read the error queue, the power supply responds with
+0, ‘‘No error’’.
• The error queue is cleared when power has been off or after a *CLS (clear
status) command has been executed. The *RST (reset) command does not
clear the error queue.
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System-Related Commands
SYSTem:VERSion?
This command queries the power supply to determine the present SCPI
version. The returned value is of a string in the form YYYY.V where the ‘‘Y’s’’
represent the year of the version, and the ‘‘V’’ represents a version number for
that year (for example, 1996.0).
*IDN?
This query command reads the power supply’s identification string. The power
supply returns four fields separated by commas. The first field is the
manufacturer’s name, the second field is the model number, the third field is
not used (always ‘‘0’’), and the fourth field is a revision code which contains
three numbers. The first number is the firmware revision number for the main
power supply processor; the second is for the input/output processor; and the
third is for the front-panel processor.
The command returns a string with the following format (be sure to dimension
a string variable with at least 40 characters):
HEWLETT-PACKARD,E3633A or E3634A,0,X.X-X.X-X.X
*RST
This command resets the power supply to its power-on state as follows:
Command
CURR
E3633A state
E3634A state
20 A
7 A
0.32 mA (typical value) 0.13 mA (typical value)
CURR:STEP
CURR:TRIG
CURR:PROT
CURR:PROT:STAT
DISP
20 A
22.0 A
ON
7 A
7.5 A
ON
ON
OFF
OFF
0
ON
OFF
OFF
0
OUTP
OUTP:REL
TRIG:DEL
TRIG:SOUR
VOLT
BUS
0 V
BUS
0 V
0.36 mV (typical value) 0.95 mV (typical value)
VOLT:STEP
VOLT:TRIG
VOLT:PROT
VOLT:PROT:STAT
VOLT:RANG
0 V
0 V
22.0 V
ON
55.0 V
ON
P8V (Low)
P25V (Low)
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System-Related Commands
*TST?
This query performs a complete self-test of the power supply. Returns ‘‘0’’ if
the self-test passes or ‘‘1’’ or any non-zero value if it fails. If the self-test fails,
an error message is also generated with additional information on why the test
failed.
*SAV { 1 | 2 | 3 }
This command stores the present state of the power supply to the specified
location in non-volatile memory. Three memory locations (numbered 1, 2 and
3) are available to store operating states of the power supply. The state storage
feature ‘‘remembers’’ the states or values of the following commands:
CURR, CURR:STEP, CURR:TRIG, CURR:PROT, CURR:PROT:STAT
DISP, OUTP, OUTP:REL, TRIG:DEL, TRIG:SOUR, VOLT,
VOLT:STEP, VOLT:TRIG, VOLT:PROT, VOLT:PROT:STAT, and
VOLT:RANG
To recall a stored state, you must use the same memory location used
previously to store the state.
4
*RCL { 1 | 2 | 3 }
This command recalls a previously stored state. To recall a stored state, you
must use the same memory location used previously to store the state.
N o t e
DISP {OFF|ON}can be stored and recalled in remote interface mode only. Going
to local mode automatically sets the display state to ON.
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Chapter 4 Remote Interface Reference
Calibration Commands
Calibration Commands
of the calibration features of the power supply. For more detailed discussion
of the calibration procedures, see the Service Guide.
N o t e
When you calibrate the power supply, you should not set the OVP and OCP to ON
state in order to prevent OVP or OCP from tripping.
CALibration:COUNt?
This command queries the power supply to determine the number of times it
hasbeencalibrated.Yourpowersupply wascalibratedbeforeitleftthefactory.
When you receive your power supply, read the count to determine its initial
value. Since the value increments by one for each calibration point, a complete
calibration will increase the value by 5 counts.
CALibration:CURRent[:DATA] <numeric value>
This command can only be used after calibration is unsecured and the output
state is ON. It enters a current value that you obtained by reading an external
meter. You must first select the minimum calibration level (CAL:CURR:LEV
MIN) for the value being entered. You must then select the middle and
maximum calibration levels (CAL:CURR:LEV MIDand CAL:CURR:LEV MAX
) for the value being entered. Three successive values must be selected and
entered. The power supply then computes new calibration constants. These
constants are then stored in non-volatile memory.
CALibration:CURRent:LEVel {MINimum | MIDdle|MAXimum}
This command can only be used after calibration is unsecured and the output
state is ON. It sets the power supply to a calibration point that is entered with
CAL:CURRcommand. During calibration, three pointsmust be entered and the
low-end point (MIN) must be selected and entered first.
CALibration:CURRent:PROTection
This command calibrates the overcurrent protection circuit of the power
supply. It takes about 10 seconds to execute the command. The calibration
must be unsecured and the output shorted before calibrating the overcurrent
protection. The power supply automatically performs the calibration and
stores the new overcurrent constant in nonvolatile memory. Notice that
current calibration precedes before sending this command.
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Chapter 4 Remote Interface Reference
Calibration Commands
CALibration:DAC:ERRor
This command corrects the differential nonlinearity error of the internal DAC
without an external meter. You must send this command before calibrating the
voltage. It takes about 30 seconds to execute the command.
CALibration:SECure:CODE <new code>
This command enters a new security code. To change the security code, first
unsecure the power supply using the old security code. Then, enter the new
code. The calibration code may contain up to 12 characters over the remote
interface but the first character must always be a letter.
CALibration:SECure:STATe {OFF | ON},<code>
This command unsecures or secures the power supply for calibration. The
calibration code may contain up to 12 characters over the remote interface.
CALibration:SECure:STATe?
This command queries the secured state for calibration of the power supply.
The returned parameter is ‘‘0’’ (OFF) or ‘‘1’’ (ON).
4
CALibration:STRing <quoted string>
This command records calibration information about your power supply. For
example, you can store such information as the last calibration date, the next
calibration due date, or the power supply’s serial number. The calibration
message may contain up to 40 characters. The power supply should be
unsecured before sending a calibration message.
CALibration:STRing?
This command queries the calibration message and returns a quoted string.
CALibration:VOLTage[:DATA] <numeric value>
This command can only be used after calibration is unsecured and the output
state is ON. It enters a voltage value that you obtained by reading an external
meter. You must first select the minimum calibration level (CAL:VOLT:LEV
MIN) for the value being entered. You must then select the middle and
maximum calibration levels(CAL:VOLT:LEVMIDand CAL:VOLT:LEV MAX)
for the value being entered. Three successive values must be selected and
entered. The power supply then computes new voltage calibration constants.
These constants are then stored in non-volatile memory.
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Chapter 4 Remote Interface Reference
Calibration Commands
CALibration:VOLTage:LEVel {MINimum | MIDdle|MAXimum}
This command can only be used after calibration is unsecured and the output
state is ON. It sets the power supply to a calibration point that is entered with
CAL:VOLTcommand. During calibration, three pointsmustbe enteredandthe
low-end point (MIN) must be selected and entered first.
CALibration:VOLTage:PROTection
This command calibrates the overvoltage protection circuit of the power
supply. It takes about 10 seconds to execute the command. The calibration
mustbeunsecuredandtheoutputbeopenedbeforecalibratingtheovervoltage
protection circuit. The power supply automatically performs the calibration
and stores the new overvoltage constant in nonvolatile memory. Notice that
voltage calibration precedes before sending this command.
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Chapter 4 Remote Interface Reference
RS-232 Interface Commands
RS-232 Interface Commands
Use the front-panel ‘‘I/O Config’’ key to select the baud rate, parity, and the
number of data bits (see chapter 3 ‘‘Remote Interface Configuration’’,
starting on page 58).
SYSTem:LOCal
This command places the power supply in the local mode during RS-232
operation. All keys on the front panel are fully functional.
SYSTem:REMote
This command places the power supply in the remote mode for RS-232
operation. All keys on the front panel, except the ‘‘Local’’ key, are disabled.
It is very important that you send the SYST:REM command to place the
power supply in the remote mode. Sending or receiving data over the
RS-232 interface when not configured for remote operation can cause
unpredictable results.
4
SYSTem:RWLock
This command places the power supply in the remote mode for RS-232
operation. This command is the same as the SYST:REM command except that
all keys on the front panel are disabled, including the ‘‘Local’’ key.
Ctrl-C
This command clears the operation in progress over the RS-232 interface and
discards any pending output data. This is equivalent to the IEEE-488 device
clear action over the GPIB interface.
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Chapter 4 Remote Interface Reference
The SCPI Status Registers
The SCPI Status Registers
All SCPI instruments implement status registers in the same way. The status
system records various instrument conditions in three register groups: the
Status Byte register, the Standard Event register, and the Questionable Status
register groups. The status byte register records high-level summary
information reported in the other register groups. The diagram on the
subsequent pages illustrates the SCPI status system used by the power supply.
What is an Event Register?
An event register is a read-only register that reports defined conditions within
the power supply. Bits in an event register are latched. Once an event bit is set,
subsequent state changes are ignored. Bits in an event register are
automatically cleared by a query of that register (such as *ESR? or
STAT:QUES:EVEN?) or by sending the *CLS (clear status) command. A reset
(*RST) or device clear will not clear bits in event registers. Querying an event
registerreturnsadecimalvaluewhichcorrespondstothe binary-weightedsum
of all bits set in the register.
What is an Enable Register?
An enable register defines which bits in the corresponding event register are
logically ORed together to form a single summary bit. Enable registers are both
readable and writable. Querying an enable register will not clear it. The *CLS
(clear status) command does not clear enable registers but it does clear the
bits in the event registers. To enable bits in an enable register, you must write
a decimal value which corresponds to the binary-weighted sum of the bits you
wish to enable in the register.
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Chapter 4 Remote Interface Reference
The SCPI Status Registers
SCPI Status System
4
Binary Weight
0
2 = 1
1
2 = 2
2
2 = 4
3
2 = 8
4
2 = 16
5
2 = 32
6
2 = 64
7
2 = 128
8
2 = 256
9
2 = 512
10
2
2
2
2
2
2
= 1024
= 2048
= 4096
= 8192
= 16384
= 32768
11
12
13
14
15
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Chapter 4 Remote Interface Reference
The SCPI Status Registers
The Questionable Status Register
The Questionable Status register provides information about voltage and
current regulation. Bit 0 is set when the voltage becomes unregulated, and bit
1 is set if the current becomes unregulated. For example if the power supply
momentarily goes to constant current mode when the power supply is
operating as a voltage source (constant voltage mode), bit 0 is set to indicate
that the voltage output is not regulated.
The Questionable Status register also provides information that the power
supply has an overtemperature condition and that the overvoltage and
overcurrent protection circuits have tripped. Bit 4 reports an overtemperature
condition of the fan, bit 9 reports that the overvoltage protection circuit has
tripped, and bit 10 reports that the overcurrent protection circuit has tripped.
To read the register, send STATus:QUEStionable?.
Table 4-3. Bit Definitions - Questionable Status Register
Bit
Decimal
Value
Definition
0
Voltage
1
2
0
The power supply is/was in the constant current mode.
The power supply is/was in the constant voltage mode.
Always set to 0.
1
Current
2-3
4
Not Used
Overtemperature 16
The fan has a fault condition.
5-8
9
Not Used
0
Always set to 0.
Over Voltage
Over Current
512
1024
0
The overvoltage protection circuit has tripped.
The overcurrent protection circuit has tripped.
Always set to 0.
10
11-15 Not Used
The Questionable Status Event register is cleared when:
• You execute the *CLS(clear status) command.
• You query the event register using STAT:QUES? (Status Questionable
Event register) command.
For example, 16 is returned when you have queried the status of the
questionable event register, the temperature condition is questionable.
The Questionable Status Enable register is cleared when:
• You execute STAT:QUES:ENAB 0command.
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The SCPI Status Registers
The Standard Event Register
The Standard Event register reports the following types of instrument events:
power-on detected, command syntax errors, command execution errors, self-
testor calibration errors, query errors, or when an *OPC command is executed.
Any or all of these conditions can be reported in the standard event summary
bit (ESB, bit 5) of Status Byte register through the enable register. To set the
enable register mask, you write a decimal value to the register using the *ESE
(Event Status Enable) command.
An error condition (Standard Event register bit 2, 3, 4, or 5) will always
record one or more errors in the power supply’s error queue. Read the
error queue using the SYST:ERR? command.
Table 4-4. Bit Definitions – Standard Event Register
Bit
Decimal
Value
Definition
0
OP
C
Operation Complete. All commands prior to and
including an *OPC command have been executed.
4
1
0
1
2
Not Used
QYE
Always set to 0.
Query Error. The power supply tried to read the output
buffer but it was empty. Or, new command line was
receivedbefore a previousquery had been read. Or, both
the input and output buffers are full.
4
3
4
5
DDE
Device Error. A self-test or calibration error occurred
(see error numbers 601 through 750 in chapter 5).
8
EXE
Execution Error. An execution error occurred (see error
numbers -211 through -224 in chapter 5).
16
CME
CommandError.Acommandsyntaxerroroccurred(see
error numbers -101 through -178 in chapter 5).
32
0
6
7
Not Used
Always set to 0.
P
ON
Power On. Power has been turned off and on since the
last time the event register was read or cleared.
128
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Chapter 4 Remote Interface Reference
The SCPI Status Registers
The Standard Event register is cleared when:
• You execute the *CLS(clear status) command.
• You query the event register using the *ESR?(Event Status register)
command.
For example, 28 (4 + 8 + 16) is returned when you have queried the status of
the Standard Event register, QYE, DDE, and EXE conditions have occurred.
The Standard Event Enable register is cleared when:
• You execute the *ESE 0command.
• You turn on the power and have previously configured the power supply
using the *PSC 1command.
• The enable register will not be cleared at power-on if you have previously
configured the power supply using the *PSC 0command.
The Status Byte Register
The Status Byte summary register reports conditions from the other status
registers. Query data that is waiting in the power supply’s output buffer is
immediately reported through the “Message Available” bit(bit 4) ofStatus Byte
register. Bits in the summary register are notlatched. Clearing an event register
will clear the corresponding bits in the Status Byte summary register. Reading
all messages in the output buffer, including any pending queries, will clear the
message available bit.
Table 4-5. Bit Definitions – Status Byte Summary Register
Bit
Decimal
Value
Definition
0-2
3
Not Used
0
Always set to 0.
QUES
One or more bits are set in the questionable status
register (bits must be “enabled” in the enable register).
8
4
5
MAV
ESB
16
32
Data is available in the power supply output buffer.
One or more bits are set in the standard event register
(bits must be “enabled” in the enable register).
6
7
RQS
64
0
The power supply is requesting service (serial poll).
Always set to 0.
Not Used
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Chapter 4 Remote Interface Reference
The SCPI Status Registers
The Status Byte Summary register is cleared when:
• You execute the *CLS(clear status) command.
• Querying the Standard Event register (*ESR?command) will clear only bit
5 in the Status Byte summary register.
For example, 24 (8 + 16) is returned when you have queried the status of the
Status Byte register, QUES and MAV conditions have occurred.
The Status Byte Enable register (Request Service) is cleared when:
• You execute the *SRE 0command.
• You turn on the power and have previously configured the power supply
using the *PSC 1command.
• The enable register will not be cleared at power-on if you have previously
configured the power supply using *PSC 0.
Using Service Request (SRQ) and Serial POLL
You must configure your bus controller to respond to the IEEE-488 service
request (SRQ) interrupt to use this capability. Use the Status Byte enable
register (*SREcommand) to select which summary bits will set the low-level
IEEE-488 service requestsignal. When bit 6 (requestservice) is set in the Status
Byte, an IEEE-488 service request interrupt message is automatically sent to
the bus controller. The bus controller may then poll the instruments on the bus
to identify which one requested service (the instrument with bit 6 set in its
Status Byte).
4
The request service bit is cleared only by reading the Status Byte using an
IEEE-488 serial poll or by reading the event register whose summary bit is
causing the service request.
To read the Status Byte summary register, send the IEEE-488 serial poll
message. Querying the summary register will return a decimal value which
corresponds to the binary-weighted sum of the bits set in the register. Serial
poll will automatically clear the “request service” bit in the Status Byte
summary register. No other bits are affected. Performing a serial poll will not
affect instrument throughput.
C a u t i o n
The IEEE-488 standard does not ensure synchronization between your bus controller
program and the instrument. Use the *OPC?command to guarantee that commands
previously sent to the instrument have completed. Executing a serial poll before a
*RST, *CLS,or other commands have completed can cause previous conditions
to be reported.
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The SCPI Status Registers
Using *STB? to Read the Status Byte
The *STB?(Status Byte query) command is similar to a serial poll but it is
processed like any other instrument command. The *STB?command returns
the same result as a serial poll but the “request service” bit (bit 6) is not cleared.
The *STB?command is not handled automatically by the IEEE-488 bus
interface hardware and will be executed only after previous commands have
completed. Polling is not possible using the *STB?command. Executing the
*STB?command does not clear the Status Byte summary register.
Using the Message Available Bit (MAV)
You can use the Status Byte “message available” bit (bit 4) to determine when
data is available to read into your bus controller. The power supply
subsequently clears bit 4 only after all messages have been read from the
output buffer.
To Interrupt Your Bus Controller Using SRQ
1 Send a device clear message to clear the power supply’s output buffer (e.g.,
CLEAR 705).
2 Clear the event registers with the *CLS(clear status) command.
3 Set up the enable register masks. Execute the *ESEcommand to set up the
Standard Event register and the *SREcommand for the Status Byte.
4 Send the *OPC?(operation complete query) command and enter the result to
ensure synchronization.
5 Enable your bus controller’s IEEE-488 SRQ interrupt.
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Chapter 4 Remote Interface Reference
The SCPI Status Registers
To Determine When a Command Sequence is Completed
1 Send a device clear message to clear the power supply’s output buffer (e.g.,
CLEAR 705).
2 Clear the event registers with the *CLS(clear status) command.
3 Enable the “operation complete” bit (bit 0) in the Standard Event register by
executing the *ESE 1command.
4 Send the *OPC?(operation complete query) command and enter the result to
ensure synchronization.
5 Execute your command string to program the desired configuration, and then
execute the *OPC(operation complete) command as the last command. When
the command sequence is completed, the “operation complete” bit (bit 0) is
set in the Standard Event register.
6 Use a serial poll to check to see when bit 5 (standard event) is set in the Status
Byte summary register. You could also configure the power supply for an
SRQ interrupt by sending *SRE 32(Status Byte enable register, bit 5).
4
Using *OPC to Signal When Data is in the Output Buffer
Generally, it is best to use the “operation complete” bit (bit 0) in the Standard
Event register to signal when a command sequence is completed. This bit is
set in the register after an *OPCcommand has been executed. If you send
*OPCafter a command which loads a message in the power supply’s output
buffer (query data), you can use the “operation complete” bit to determine
when the message is available. However, if too many messages are generated
before the *OPCcommand executes (sequentially), the output buffer will fill
and the power supply will stop processing commands.
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Chapter 4 Remote Interface Reference
Status Reporting Commands
Status Reporting Commands
information of the status register structure of the power supply.
SYSTem:ERRor?
This query command reads one error from the error queue. When the front-
panel ERROR annunciator turns on, one or more command syntax or hardware
errors have been detected. A record of up to 20 errors can be stored in the
power supply’s error queue. See ‘‘Error Messages’’ for a complete listing of the
errors in chapter 5.
• The first error returned is the first error that was stored. When you have
read all errors from the queue, the ERROR annunciator turns off. The power
supply beeps once each time an error is generated.
• If more than 20 errors have occurred, the last error stored in the queue (the
most recent error) is replaced with -350, ‘‘Too many errors’’. No additional
errors are stored until you remove errors from the queue. If no errors have
occurred when you read the error queue, the power supply responds with
+0, ‘‘No error’’.
• The error queue is cleared when power has been off or after a *CLS (clear
status) command has been executed. The *RST (reset) command does not
clear the error queue.
• All errors are cleared when you exit the menu or let the display time out for
about 30 seconds.
STATus:QUEStionable:CONDition?
This command queries the Questionable Status condition register to check CV
or CC mode of the power supply. The power supply returns a decimal value
which corresponds to the binary-weighted sum of all bits in the register. These
bits are not latched. If ‘‘0’’ is returned, the power supply is in output off or
unregulated state. If ‘‘1’’ is returned, the power supply is in the CC operating
mode and if ‘‘2’’ is returned, the power supply is in the CV operating mode. If
‘‘3’’ is returned, the power supply is in failure.
STATus:QUEStionable?
This command queries the Questionable Status event register. The power
supply returns a decimal value which corresponds to the binary-weighted sum
of all bits in the register. These bits are latched. Reading the event register
clears it.
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Chapter 4 Remote Interface Reference
Status Reporting Commands
STATus:QUEStionable:ENABle <enable value>
This command enables bits in the Questionable Status enable register. The
selected bits are then reported to the Status Byte.
STATus:QUEStionable:ENABle?
This command queries the Questionable Status enable register. The power
supplyreturnsa binary-weighteddecimalrepresentingthe bitssetinthe enable
register.
*CLS
This command clears all event registers and Status Byte register.
*ESE<enable value>
This command enables bits in the Standard Event enable register. The selected
bits are then reported to the Status Byte.
*ESE?
This command queries the Standard Event enable register. The power supply
returns a decimal value which corresponds to the binary-weighted sum of all
bits in the register.
4
*ESR?
This command queries the Standard event register. The power supply returns
a decimal value which corresponds to the binary-weighted sum of all bits in
the register.
*OPC
This command sets the ‘‘Operation Complete’’ bit (bit 0) of the Standard Event
register after the command is executed.
*OPC?
This command returns ‘‘1’’ to the output buffer after the command is executed.
*PSC { 0 | 1 }
(Power-onstatusclear.) Thiscommandclearsthe StatusByteand theStandard
Event register enable masks when power is turned on (*PSC 1). When
*PSC 0is in effect, the Status Byte and Standard Event register enable masks
are not cleared when power is turned on.
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Chapter 4 Remote Interface Reference
Status Reporting Commands
*PSC?
This command queries the power-on status clear setting. The returned
parameter is ‘‘0’’ (*PSC 0) or ‘‘1’’ (*PSC 1).
*SRE <enable value>
This command enables bits in the Status Byte enable register.
*SRE?
This command queries the Status Byte Enable register. The power supply
returns a decimal value which corresponds to the binary-weighted sum of all
bits set in the enable register.
*STB?
ThiscommandqueriestheStatusBytesummaryregister.The*STB?command
is similar to a serial poll but it is processed like any other instrument command.
The *STB?command returns the same result as a serial poll but the ‘‘Request
Service’’ bit (bit 6) is not cleared if a serial poll has occurred.
*WAI
This command instructs the power supply to wait for all pending operations
to complete before executing any additional commands over the interface.
Used only in the triggered mode.
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Chapter 4 Remote Interface Reference
An Introduction to the SCPI Language
An Introduction to the SCPI Language
SCPI (Standard Commands for Programmable Instruments) is an ASCII-
based instrument command language designed for test and measurement
instruments. Refer to ‘‘Simplified Programming Overview’’, starting on page 80
for an introduction to the basic techniques used to program the power supply
over the remote interface.
SCPI commands are based on a hierarchical structure, also known as a tree
system. In this system, associated commands are grouped together under a
common node or root, thus forming subsystems. A portion of the SOURce
subsystem is shown below to illustrate the tree system.
[SOURce:]
CURRent {<current>|MIN|MAX|UP|DOWN}
CURRent? [MIN|MAX]
CURRent:
4
TRIGgered {<current>|MIN|MAX}
TRIGgered?{MIN|MAX}
VOLTage {<voltage>|MIN|MAX|UP|DOWN}
VOLTage? [MIN|MAX]
VOLTage:
TRIGgered {<voltage>|MIN|MAX}
TRIGgered? {MIN|MAX}
SOURceis the root keyword of the command, CURRentand VOLTageare
second-level keywords, and TRIGgeredis third-level keywords. A colon (:)
separates a command keyword from a lower-level keyword.
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Chapter 4 Remote Interface Reference
An Introduction to the SCPI Language
Command Format Used in This Manual
The format used to show commands in this manual is shown below:
CURRent {<current>|MINimum|MAXimum|UP|DOWN}
The command syntax shows most commands (and some parameters) as a
mixture of upper- and lower-case letters. The upper-case letters indicate the
abbreviated spelling for the command. For shorter program lines, send the
abbreviated form. For better program readability, send the long form.
For example, in the above syntax statement, CURRand CURRENTare both
acceptable forms. You can use upper- or lower-case letters. Therefore,
CURRENT, curr, and Currare all acceptable. Other forms, such as CURand
CURREN, will generate an error.
Braces ( { } ) enclose the parameter choices for a given command string. The
braces are not sent with the command string.
A vertical bar ( | ) separates multiple parameter choices for a given command
string.
Triangle brackets ( < > ) indicate that you must specify a value for the enclosed
parameter. For example, the above syntax statement shows the current
parameter enclosed in triangle brackets. The brackets are not sent with the
command string. You must specify a value for the parameter (such as ‘‘CURR
0.1”).
Some parameters are enclosed in square brackets ( [ ] ). The brackets indicate
that the parameter is optional and can be omitted. The brackets are not sent
with the command string. If you do not specify a value for an optional
parameter, the power supply chooses a default value.
Some portions ofcommandsare enclosedinsquare brackets( []). The brackets
indicate that this portion of the command is optional. Most optional portions
of the command are not shown in the command description. For the full
command showing all the options, see ‘‘SCPI Command Summary’’, starting
A colon ( : ) separates a command keyword from a lower-level keyword. You
must insert a blank space to separate a parameter from a command keyword.
If a command requires more than one parameter, you must separate adjacent
parameter using a comma as shown below:
‘‘SOURce:CURRent:TRIGgered’’
‘‘APPLy 3.5,1.5’’
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Chapter 4 Remote Interface Reference
An Introduction to the SCPI Language
Command Separators
A colon ( : ) is used to separate a command keyword from a lower-level
keyword as shown below:
‘‘SOURce:CURRent:TRIGgered’’
Asemicolon(;)isusedtoseparatetwocommandswithin the samesubsystem,
and can also minimize typing. For example, sending the following command
string:
‘‘SOUR:VOLT MIN;CURR MAX’’
... is the same as sending the following two commands:
‘‘SOUR:VOLT MIN’’
‘‘SOUR:CURR MAX’’
Use a colon and a semicolon to link commands from different subsystems.
For example, in the following command string, an error is generated if you do
not use the colon and semicolon:
‘‘DISP:TEXT:CLE;:SOUR:CURR MIN’’
4
Using the MIN and MAX Parameters
You can substitute MINimumor MAXimumin place of a parameter for many
commands. For example, consider the following command:
CURRent {<current>|MIN|MAX}
Instead of selecting a specific current, you can substitute MINimumto set the
current to its minimum value or MAXimumto set the current to its maximum
value.
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Chapter 4 Remote Interface Reference
An Introduction to the SCPI Language
Querying Parameter Settings
You can query the value of most parameters by adding a question mark (?) to
the command. For example, the following command sets the output current
to 5 amps:
‘‘CURR 5’’
You can query the value by executing:
‘‘CURR?’’
You can also query the minimum or maximum value allowed with the present
function as follows:
‘‘CURR? MAX’’
‘‘CURR? MIN’’
C a u t i o n
If you send two query commands without reading the response from the first, and then
attempttoreadthesecondresponse, youmayreceivesomedatafromthefirstresponse
followed by the complete second response. To avoid this, do not send a query
command without reading the response. When you cannot avoid this situation, send
a device clear before sending the second query command.
SCPI Command Terminators
A command string sent to the power supply must terminate with a <new line>
character. The IEEE-488 EOI (end-or-identify) message is interpreted as a
<new line> character and can be used to terminate a command string in place
of a <new line> character. A <carriage return> followed by a <new line> is
also accepted. Command string termination will always reset the current SCPI
command path to the root level. The <new line> character has the ASCII
decimal code of 10.
IEEE-488.2 Common Commands
The IEEE-488.2 standard defines a set of common commands that perform
functions like reset, self-test, and status operations. Common commands
always begin with an asterisk ( * ), are four to five characters in length, and
may include one or more parameters. The command keyword is separated
from the first parameter by a blank space. Use a semicolon ( ; ) to separate
multiple commands as shown below:
‘‘*RST; *CLS; *ESE 32; *OPC?”
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Chapter 4 Remote Interface Reference
An Introduction to the SCPI Language
SCPI Parameter Types
The SCPIlanguage definesseveraldifferentdataformats tobeused inprogram
messages and response messages.
Numeric Parameters Commands that require numeric parameters will
accept all commonly used decimal representations of numbers including
optional signs, decimal points, and scientific notation. Special values for
numericparameterslikeMINimum,MAXimum,andDEFaultarealsoaccepted.
You can also send engineering unit suffixes (V, A or SEC) with numeric
parameters. Ifonly specific numeric valuesare accepted, the power supply will
automatically round the input numeric parameters. The following command
uses a numeric parameter:
CURR {<current>|MIN|MAX|UP|DOWN}
Discrete Parameters Discrete parameters are used to program settings that
have a limited number of values (like BUS, IMM). Query responses will always
return the short form in all upper-case letters. The following command uses
discrete parameters:
4
TRIG:SOUR {BUS|IMM}
Boolean Parameters Boolean parameters represent a single binary
condition that is either true or false. For a false condition, the power supply
will accept ‘‘OFF’’ or ‘‘ 0 ’’. For a true condition, the power supply will accept
‘‘ON’’ or ‘‘ 1 ’’. When you query a boolean setting, the power supply will always
return ‘‘ 0 ’’ or ‘‘ 1 ’’. The following command uses a boolean parameter:
DISP {OFF|ON}
String Parameters String parameters can contain virtually any set of ASCII
characters. A string must begin and end with matching quotes; either with a
single quote or with a double quote. You can include the quote delimiter as part
of the string by typing it twice without any characters in between. The
following command uses a string parameter:
DISP:TEXT <quoted string>
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Chapter 4 Remote Interface Reference
Halting an Output in Progress
Halting an Output in Progress
You can send a device clear at any time to stop an output in progress over the
GPIB interface. The status registers, the error queue, and all configuration
statesare left unchanged when a device clear message is received. Device clear
performs the following actions.
• The power supply’s input and output buffers are cleared.
• The power supply is prepared to accept a new command string.
• The following statement shows how to send a device clear over the GPIB
interface using Agilent BASIC.
CLEAR 705
IEEE-488 Device Clear
• The following statement shows how to send a device clear over the GPIB
interface using the GPIB Command Library for C or QuickBASIC.
IOCLEAR (705)
For RS-232 operation, sending the <Ctrl-C> character will perform the
same operation as the IEEE-488 device clear message. The power
supply’s DTR (data terminal ready) handshake line is set true following
a device clear message. See ‘‘DTR/DSR Handshake Protocol’’, on page 66
in chapter 3 for further details.
N o t e
All remote interface configurations can be entered only from the front panel. See
‘‘Remote Interface Configuration’’ in chapter 3 to configure for GPIB or RS-232
interface before operating the power supply remotely.
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Chapter 4 Remote Interface Reference
SCPI Conformance Information
SCPI Conformance Information
The Agilent E3633A and E3634A DC Power Supplies conform to the ‘1996.0’
version of the SCPI standard. Many of the commands required by the standard
are accepted by the power supply but are not described in this manual for
simplicity or clarity. Most of these non-documented commands duplicate the
functionality of a command already described in this manual.
SCPI Confirmed Commands
The following table lists the SCPI-confirmed commands that are used by the
power supply.
DISPlay
[:WINDow][:STATe] {OFF|ON}
[:WINDow][:STATe]?
[:WINDow]:TEXT[:DATA] <quoted string>
[:WINDow]:TEXT[:DATA]?
[:WINDow]:TEXT:CLEar
4
INITiate[:IMMediate]
MEASure
:CURRent[:DC]?
[:VOLTage][:DC]?
OUTPut
[:STATe] {OFF|ON}
[:STATE]?
[SOURce]
:CURRent[:LEVel][:IMMediate][:AMPLitude] {<current>|MIN|MAX|UP|DOWN}
:CURRent[:LEVel][:IMMediate][:AMPLitude]? [MIN|MAX]
:CURRent[:LEVel][:IMMediate]:STEP[:INCRement] {<numeric value>|DEFault}
:CURRent[:LEVel][:IMMediate]:STEP[:INCRement]? {DEFault}
:CURRent[:LEVel]:TRIGgered[:AMPLitude] {<current>|MIN|MAX}
:CURRent[:LEVel]:TRIGgered[:AMPLitude]?[MIN|MAX]
:CURRent:PROTection[:LEVel] {<current>|MIN|MAX}
:CURRent:PROTection[:LEVel]? {MIN|MAX}
:CURRent:PROTection:STATe {0|1|OFF|ON}
:CURRent:PROTection:STATe?
:CURRent:PROTection:TRIPped?
:CURRent:PROTection:CLEar
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Chapter 4 Remote Interface Reference
SCPI Conformance Information
SCPI Confirmed Commands (continued)
[SOURce]
:VOLTage[:LEVel][:IMMediate][:AMPLitude] {<voltage>|MIN|MAX|UP|DOWN}
:VOLTage[:LEVel][:IMMediate][:AMPLitude]?[MIN|MAX]
:VOLTage[:LEVel][:IMMediate]:STEP[:INCRement] {<numeric value>|DEFault}
:VOLTage[:LEVel][:IMMediate]:STEP[:INCRement]? {DEFault}
:VOLTage[:LEVel]:TRIGgered[:AMPLitude] {<voltage>|MIN|MAX}
:VOLTage[:LEVel]:TRIGgered[:AMPLitude]?[MIN|MAX]
:VOLTage:PROTection[:LEVel] {<voltage>|MIN|MAX}
:VOLTage:PROTection[:LEVel]? {MIN|MAX}
:VOLTage:PROTection:STATe {0|1|OFF|ON}
:VOLTage:PROTection:STATe?
:VOLTage:PROTection:TRIPped?
:VOLTage:PROTection:CLEar
:VOLTage:RANGe {P8V|P20V|LOW|HIGH}
:VOLTage:RANGe {P25V|P50V|LOW|HIGH}
:VOLTage:RANGe?
(For E3633A model)
(For E3634A model)
STATus
:QUEStionable:CONDition?
:QUEStionable[:EVENt]?
:QUEStionable:ENABle <enable value>
:QUEStionable:ENABle?
SYSTem
:BEEPer[:IMMediate]
:ERRor?
:VERSion
TRIGger
[:SEQuence]:DELay {<seconds>|MIN|MAX}
[:SEQuence]:DELay?
[:SEQuence]:SOURce{BUS|IMM}
[:SEQuence]:SOURce?
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Chapter 4 Remote Interface Reference
SCPI Conformance Information
Device Specific Commands
The following commands are device-specific to the Agilent E3633A and Agilent
E3634A power supplies. They are not included in the ‘1996.0’ version of the
SCPI standard. However, these commands are designed with the SCPI
standard in mind and they follow all of the command syntax rules defined by
the standard.
Non-SCPI Commands
APPLy {<voltage>|DEF|MIN|MAX>}[,{<current>|DEF|MIN|MAX}]
APPLy?
CALibration
:COUNt?
:CURRent[:DATA] <numeric value>
:CURRent:LEVel {MIN|MID|MAX}
:CURRent:PROTection
:DAC:ERRor
:SECure:CODE <new code>
:SECure:STATe {OFF|ON},<code>
:SECure:STATe?
4
:STRing <quoted string>
:STRing?
:VOLTage[:DATA] <numeric value>
:VOLTage:LEVel {MIN|MID|MAX}
:VOLTage:PROTection
OUTPut
:RELay[:STATe] {OFF|ON}
:RELay[:STATE]?
SYSTem
:LOCal
:REMote
:RWLock
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Chapter 4 Remote Interface Reference
IEEE-488 Conformance Information
IEEE-488 Conformance Information
Dedicated Hardware Lines
IEEE-488 Common Commands
ATN
IFC
REN
SRQ
Attention
*CLS
Interface Clear
Remote Enable
*ESE <enable value>
*ESE?
Service Request Enable *ESR?
*IDN?
*OPC
Addressed Commands
*OPC?
*PSC {0|1}
*PSC?
DCL
EOI
GET
GTL
LLO
SDC
SPD
SPE
Device Clear
End or Identify
*RST
Group Execute Trigger
Go To Local
*SAV {1|2|3}
*RCL {1|2|3}
*SRE <enable value>
*SRE?
Local Lockout
Selected Device Clear
Serial Poll Disable
Serial Poll Enable
*STB?
*TRG
*TST?
*WAI
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Error Messages
Errors are retrieved in first-in-first-out (FIFO) order. The first error returned
is the first error that was stored. Errors are cleared as you read them over the
remote interface. When you have read all errors from the queue, the ERROR
annunciator turns off and the errors are cleared. The power supply beeps once
each time an error is generated.
If more than 20 errors have occurred, the last error stored in the queue (the
most recent error) is replaced with -350, ‘‘Too many errors’’. No additional
errors are stored until you remove errors from the queue. If no errors have
occurred when you read the error queue, the supply responds with +0, ‘‘No
error’’ over the remote interface or ‘‘NO ERRORS’’ from the front panel.
The error queue is cleared by the *CLS(clear status) command or when power
is cycled. The errors are also cleared when you read the queue.
The *RST(reset command) command does not clear the error queue.
• Front-panel operation:
Store
Press
supply is in remote operation mode.
(Local) key to return to front-panel operation mode if the power
Local
3: ERR -102
Error
If the ERROR annunciator is on, press
key to view the errors. Use the
>
knob to scroll through the error numbers. Press
to view the text of the
key to decrease or increase the scrolling
speed of the text on the display. All errors are cleared when you exit the menu
<
>
error message. Press
or
Error
by pressing the
key or let the display time out for about 30 seconds.
• Remote interface operation:
SYSTem:ERRor?
Read and clear one error from the error queue
Errors have th5e following format (the error string may contain up to 80
characters).
-102, ‘‘Syntax error’’
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Chapter 5 Error Messages
Execution Errors
Execution Errors
-101
-102
-103
Invalid character
An invalid character was found in the command string. You may have inserted
a character such as #, $, or % in the command keyword or within a parameter.
Example: OUTP:STAT #ON
Syntax error
Invalid syntaxwasfound in the command string. You may have inserteda blank
space before or after a colon in the command header, or before a comma.
Example: VOLT:LEV ,1
Invalid separator
An invalid separator was found in the command string. You may have used a
comma instead of a colon, semicolon, or blank space - or you may have used
a blank space instead of a comma.
Example: TRIG:SOUR,BUS or APPL 1.0 1.0
-104
Data type error
The wrong parameter type was found in the command string. You may have
specified a number where a string was expected, or vice versa.
5
-105
-108
GET not allowed
A Group Execute Trigger (GET) is not allowed within a command string.
Parameter not allowed
More parameters were received than expected for the command. You may
have entered an extra parameter, or you added a parameter to a command that
does not accept a parameter.
Example: APPL? 10
-109
Missing parameter
Fewer parameters were received than expected for the command. You omitted
one or more parameters that are required for this command.
Example: APPL
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Chapter 5 Error Messages
Execution Errors
-112
-113
Program mnemonic too long
A command header was received which contained more than the maximum 12
characters allowed.
Undefined header
A command was received that is not valid for this power supply. You may have
misspelled the command or it may not be a valid command. If you are using
the shortformofthe command, remember thatitmay containup tofour letters.
Example: TRIGG:DEL 3
-121
Invalid character in number
An invalid character was found in the number specified for a parameter value.
Example: *ESE #B01010102
-123
-124
Numeric overflow
A numeric parameter was found whose exponent was larger than 32,000.
Too many digits
A numeric parameter was found whose mantissa contained more than 255
digits, excluding leading zeros.
-128
-131
Numeric data not allowed
A numeric parameter was received but a character string was expected.
Example: DISP:TEXT 123
Invalid suffix
A suffix was incorrectly specified for a numeric parameter. You may have
misspelled the suffix.
Example: TRIG:DEL 0.5 SECS
-134
-138
Suffix too long
A suffix for a numeric parameter contained too many characters.
Suffix not allowed
A suffix was received following a numeric parameter which does not accept a
suffix.
Example: STAT:QUES:ENAB 18 SEC(SEC is not a valid suffix).
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Chapter 5 Error Messages
Execution Errors
-141
Invalid character data
Either the character data element contained an invalid character or the
particular element received was not valid for the header.
-144
-148
Character data too long
The character data element contained too many characters.
Character data not allowed
A discrete parameter was received but a character string or a numeric
parameter was expected. Check the list of parameters to verify that you have
used a valid parameter type.
Example: DISP:TEXT ON
-151
-158
Invalid string data
An invalid character string was received. Check to see if you have enclosed
the character string in single or double quotes.
Example: DISP:TEXT ’ON
String data not allowed
A character string was received but is not allowed for the command. Check
the list of parameters to verify that you have used a valid parameter type.
Example: TRIG:DEL‘zero’
5
-160 to -168
-170 to -178
-211
Block data errors
The power supply does not accept block data.
Expression errors
The power supply does not accept mathematical expressions.
Trigger ignored
A Group Execute Trigger (GET) or *TRGwas received but the trigger was
ignored. Make sure that the trigger source should be selected to the bus and
the trigger subsystem should be initiated by INIT[:IMM]command.
-213
Init ignored
An INITiatecommand was received but could not be executed because a
measurement was already in progress. Send a device clear to halt a
measurement in progress and place the power supply in the ‘‘idle’’ state.
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Chapter 5 Error Messages
Execution Errors
-221
-222
Settings conflict
Indicates that a legal program data element was parsed but could not be
executed due to the current device state.
Data out of range
A numeric parameter value is outside the valid range for the command.
Example: TRIG:DEL -3
-223
-224
Too much data
A character string was received but could not be executed because the string
length was more than 40 characters. This error can be generated by the
CALibration:STRingcommand.
Illegal parameter value
A discrete parameter was received which was not a valid choice for the
command. You may have used an invalid parameter choice.
Example: DISP:STAT XYZ(XYZ is not a valid choice).
-330
-350
Self-test failed
The power supply’scomplete self-testfailed from the remote interface (*TST?
command). In addition to this error, more specific self-test errors are also
Too many errors
The error queue is full because more than 20 errors have occurred. No
additional errors are stored until you remove errors from the queue. The error
queue is cleared when power has been off, or after a *CLS(clear status)
command has been executed.
-410
-420
Query INTERRUPTED
A command was received which sends data to the output buffer, but the output
buffer contained data from a previous command (the previous data is not
overwritten). The output buffer is cleared when power has been off, or after a
*RST(reset) command has been executed.
Query UNTERMINATED
The power supply was addressed to talk (i.e., to send data over the interface)
but a command has not been received which sends data to the output buffer.
For example, you may have executed an APPLycommand (which does not
generate data) and then attempted an ENTERstatement to read data from the
remote interface.
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Chapter 5 Error Messages
Execution Errors
-430
-440
Query DEADLOCKED
A command was received which generates too much data to fit in the output
buffer and the input buffer is also full. Command execution continues but all
data is lost.
Query UNTERMINATED after indefinite response
The *IDN? command must be the last query command within a command
string.
Example: *IDN?;:SYST:VERS?
Isolator UART framing error
Isolator UART overrun error
RS-232 framing error
501
502
511
512
513
514
RS-232 overrun error
RS-232 parity error
Command allowed only with RS-232
There are three commands which are only allowed with the RS-232 interface:
SYSTem:LOCal, SYSTem:REMote, and SYSTem:RWLock.
5
521
522
550
Input buffer overflow
Output buffer overflow
Command not allowed in local
You should always execute the SYSTem:REMote command before sending
other commands over the RS-232 interface.
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Chapter 5 Error Messages
Self-Test Errors
Self-Test Errors
The following errors indicate failures that may occur during a self-test. Refer
to the Service Guide for more information.
601
602
603
604
605
606
607
608
624
625
626
630
631
632
Front panel does not respond
RAM read/write failed
A/D sync stuck
A/D slope convergence failed
Cannot calibrate rundown gain
Rundown gain out of range
Rundown too noisy
Serial configuration readback failed
Unable to sense line frequency
I/O processor does not respond
I/O processor failed self-test
Fan test failed
System DAC test failed
Hardware test failed
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Chapter 5 Error Messages
Calibration Errors
Calibration Errors
The following errors indicate failures that may occur during a calibration.
Refer to the Service Guide for more information.
701
Cal security disabled by jumper
The calibration security feature has been disabled with a jumper inside the
power supply. When applicable, this error will occur at power-on to warn you
that the power supply is unsecured.
702
703
Cal secured
The power supply is secured against calibration.
Invalid secure code
An invalid calibration security code was received whenattempting to unsecure
or secure the power supply. You must use the same security code to unsecure
the power supply as was used to secure it, and vice versa. The security code
may contain up to 12 alphanumeric characters. The first character must be a
letter.
704
705
Secure code too long
A security code was received which contained more than 12 characters.
5
Cal aborted
A calibration in progress is aborted when you press any front-panel key, send
a device clear, or change the local/remote state of the instrument.
708
712
Cal output disabled
Calibration is aborted by sending OUTP OFFcommand during calibrating a
output.
Bad DAC cal data
The specified DAC calibration values (CAL:VOLTor CAL:CURR) are out of
range. Note thatthe newcalibrationconstantsare notstoredinthe non-volatile
memory.
713
Bad readback cal data
The specified readback calibration values (CAL:VOLTor CAL:CURR) are out
of range. Note that the new calibration constants are not stored in the non-
volatile memory.
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Chapter 5 Error Messages
Calibration Errors
714
715
716
717
Bad OVP cal data
The overvoltage protection calibration constant is out of range. Note that the
new calibration constants are not stored in the non-volatile memory.
Bad OCP cal data
The overcurrent protection calibration constant is out of range. Note that the
new calibration constants are not stored in the non-volatile memory.
Bad DAC DNL error correction data
Invalid data measured during the calibration for DAC differential nonlinearity
error correction.
Cal OVP or OCP status enabled
Overvoltage protection status or overcurrent protection status is enabled. You
must set both overvoltage and overcurrent protection status to OFF before and
during the calibration.
718
Gain out of range for Gain Error Correction
The slope of the DAC gain is out of range. Hardware fails.
740
741
742
743
744
745
746
747
748
749
750
Cal checksum failed, secure state
Cal checksum failed, string data
Cal checksum failed, store/recall data in location 0
Cal checksum failed, store/recall data in location 1
Cal checksum failed, store/recall data in location 2
Cal checksum failed, store/recall data in location 3
Cal checksum failed, DAC cal constants
Cal checksum failed, readback cal constants
Cal checksum failed, GPIB address
Cal checksum failed, internal data
Cal checksum failed, DAC DNL error correction data
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Application Programs
This chapter contains two application programs over the remote interface to
help you develop programs for your own application. Chapter 4, “Remote
(Standard Commands for Programmable Instruments) commands available to
program the power supply.
Ò
The examples in this chapter have been tested on a PC running Windows 3.1,
Ò
Ò
Windows 95 or Windows NT 4.0. The examples are written for use over
GPIB (IEEE 488) or RS-232. But the examples for use over the RS-232 interface
do not work with Windows 3.1. These examples require a VISA (Virtual
Instrument Software Architecture) driver for use with your GPIB interface
Ò
card in your PC. You should have the “visa.dll” for Windows 3.1 or
Ò
Ò
“visa32.dll” for Windows 95 or Windows NT 4.0 in your c:\windows\system
directory to have the examples in this chapter run properly. The examples step
through voltages and make corresponding current readings to characterize a
power diode.
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Chapter 6 Application Programs
Example Program for C and C++
Example Program for C and C++
The following C programming example shows you how to send and receive
formatted I/O. This example programming shows you how to use the SCPI
commands for the instrument with the VISA functionality and does include
error trapping. For more information on non-formatted I/O and error trapping,
refer to the Agilent VISA User’s Guide.
Ò
The following C programming example was written in Microsoft Visual C++
version 1.52 using project type “QuickWin application’’, and using the large
memory model and C++ version 4.x or 5.0 using project type “Windows 32
Ò
application’’. Be sure to move the “visa.lib (Windows 3.1) or visa32.lib
Ò
(Windows 95/NT)” and “visa.h” file to the lib and include development
directory. These are usually found in the c:\vxipnp\win(win95 or winnt)\lib\msc
or c:\vxipnp\win (win95 or winnt)\include directory.
Diode.c
/*Diode.C
This example program steps the power supply through 11 voltages and measures the current
response. It prints the voltage step and the current response as a table. Note that the
GPIB address is the default address from the factory for the power supply.*/
#include <visa.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <conio.h>
#include <stdlib.h>
ViSession
ViSession
defaultRM;
/* Resource manager id
*/
*/
power_supply;
/* Identifies power supply
int
bGPIB = 1;
ErrorStatus;
/* Set the number to 0 for use with the RS-232 */
/* VISA Error code
long
char
char
*/
commandString[256];
ReadBuffer[256];
6
void
void
void
void
delay(clock_t wait);
SendSCPI(char* pString);
CheckError(char* pMessage);
OpenPort();
void main()
{
double
char
voltage;
/* Value of voltage sent to power supply
/* String returned from power supply
/* Value of current output of power supply
*/
*/
*/
Buffer[256];
current;
double
Continued on next page
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Chapter 6 Application Programs
Example Program for C and C++
OpenPort();
/* Query the power supply id, read response and print it */
sprintf(Buffer,"*IDN?");
SendSCPI(Buffer);
printf("Instrument identification string:\n
%s\n\n",Buffer);
SendSCPI("*RST");
/* Set power-on condition
*/
*/
*/
SendSCPI("Current 2");
SendSCPI("Output on");
/* Set current limit to 2A
/* Turn output on
printf("Voltage
Current\n\n");
/* Print heading
*/
/*Step from 0.6 to 0.8 volt in 0.02 steps */
for(voltage = 0.6; voltage <=0.8001; voltage +=0.02)
{
printf("%.3f",voltage);
/* Display diode voltage*/
/* Set output voltage */
ErrorStatus = viPrintf(power_supply,"Volt %f\n",voltage);
if(!bGPIB)
delay(500);/* 500 msec wating for RS-232 port*/
CheckError("Unable to set voltage");
/* Measure output current */
ErrorStatus = viPrintf(power_supply,"Measure:Current?\n");
CheckError("Unable to write device");
delay(500);
/* Allow output to wait for 500 msec */
/* Retrieve reading */
ErrorStatus = viScanf(power_supply,"%lf",¤t);
CheckError("Unable to read voltage");
printf("%6.4f\n",current);
/* Display diode current */
}
SendSCPI("Output off");
ClosePort();
/* Turn output off */
}
/* Build the address required to open commnuication with GPIB card or RS-232.*/
/* The address format looks like this: "GPIB0::5::INSTR". */
/* To use the RS-232 interface using COM1 port, change it to "ASRL1::INSTR"
/* address format */
*/
void OpenPort()
{
char
char
char
GPIB_Address[3];
COM_Address[2];
VISA_address[40];
/* Complete VISA address sent to card */
if(bGPIB)
strcpy(GPIB_Address,"5");
else
strcpy(COM_Address,"1");
/* Select GPIB address between 0 to 30*/
/* Set the number to 2 for COM2 port */
Continued on next page
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Chapter 6 Application Programs
Example Program for C and C++
if(bGPIB){ /* For use with GPIB 7 address, use "GPIB::7::INSTR" address format */
strcpy(VISA_address,"GPIB::");
strcat(VISA_address,GPIB_Address);
strcat(VISA_address,"::INSTR");
}
else{
/* For use with COM2 port, use "ASRL2::INSTR" address format
*/
strcpy(VISA_address,"ASRL");
strcat(VISA_address,COM_Address);
strcat(VISA_address,"::INSTR");
}
/* Open communication session with the power supply */
ErrorStatus = viOpenDefaultRM(&defaultRM);
ErrorStatus = viOpen(defaultRM,VISA_address,0,0,&power_supply);
CheckError("Unable to open port");
if(!bGPIB)
SendSCPI("System:Remote");
}
void
SendSCPI(char* pString)
char* pdest;
{
strcpy(commandString,pString);
strcat(commandString,"\n");
ErrorStatus = viPrintf(power_supply,commandString);
CheckError("Can’t Write to Driver");
if (bGPIB == 0)
delay(1000);
/* Unit is milliseconds */
pdest = strchr(commandString, ’?’); /* Search for query command
if( pdest != NULL ){
*/
ErrorStatus = viScanf(power_supply,"%s",&ReadBuffer);
CheckError("Can’t Read From Driver");
strcpy(pString,ReadBuffer);
6
}
}
void ClosePort()
{
/* Close the communication port */
viClose(power_supply);
viClose(defaultRM);
}
Continued on next page
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Chapter 6 Application Programs
Example Program for C and C++
void CheckError(char* pMessage)
{
if (ErrorStatus VI_SUCCESS){
printf("\n %s",pMessage);
ClosePort();
exit(0);
}
}
void delay(clock_t wait)
{
clock_t goal;
goal = wait + clock();
while( goal > clock() ) ;
}
End of Program
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Chapter 6 Application Programs
Example Program for Excel 97
Example Program for Excel 97
Thissectioncontainstheexample programwrittenusing ExcelMacros(Visual
Ò
Basic for Applications) to control your Agilent E3633A or Agilent E3634A.
With Excel you can take the value of a cell in a spread sheet, send it to the
power supply, and then record the response on the worksheet. The example
on the following pages characterizes a component across the terminals of the
power supply. This example reads 11 voltages from a worksheet, programs
the power supply to that voltage, and then reads the current. The value of
current is recorded next to the voltage on the spread sheet.
Example
program result
The following table shows the result of the example program starting on page
139 for characterizing a diode. (Agilent Part number: 1901-1214, Manufacturer
Ò
Part number: MUR160, Motorola Co.)
6
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Chapter 6 Application Programs
Example Program for Excel 97
To write an Excel macro you must first open a module in Excel. Go to the View
menu, choose Toolbars, and then select Control Toolbox. The Control Toolbox
dialog box appears. Select the Command button in the dialog box. Click cell
A1 and drag across the cell B3. The “CommandButton1” box is created. To
change the button name, click the right mouse button on that button and then
select Properties. The Properties dialog box appears. In the Properties dialog,
change the “(name)” and “caption” to “Diode”. To try the example for
characterizing a diode, type “Voltages” in cell A4 and “Current” in cell B4. In
cell A5 type 0.6. Fill in the cells A5 to A15 in 0.02 increments so that cell A15
contains 0.8.
To enter the “Diode” macro example in this section, go to the View menu,
choose Toolbars, and then Visual Basic Editor icon. The “Code window”
appears. Then type the text as shown on page 139 into the “[Moudle1 (code)]”
Ò
window. To enter the declaration for Windows 95/NT, go to the Insert menu,
choose Module. The “Module window” appears. Then type the text as shown
starting on page 141. This module will configure all of the overhead required
to communicate with the power supply over the interface. Choose the
preferred interface by setting “bGPIB=” to “True” or “False” and change the
GPIB address or RS-232 port in the routine “OpenPort( )’’ contained in the
module.
To run the macro, return back to the Excel window and select the Run Macro
button in the dialog box and choose the macro name, and then click on the
Run button . The power supply will reset to power on condition and then step
through the voltages in the worksheet. After each step the current is measured,
and recorded in the worksheet.
Make any changes necessary to suit your application in the “Diode’’ module.
You must enter the information in the modules exactly as shown or error will
be generated. If several system errors occur while attempting to run a macro,
you may have to reboot your PC to get the GPIB port or RS-232 port to work
properly.
Ò
To use the example with Window 3.1, you will need to modify the declarations at
the top of the module. Change ‘visa32.dll’ to ‘visa.dll’ in all declarations.
N o t e
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Chapter 6 Application Programs
Example Program for Excel 97
Diode Macro
'"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
' This is the subroutine first executed. Modify this routine to suit
' your needs. To change the GPIB address, go to the module OpenPort, and
' change the variable GPIB_Address = "5” to the required GPIB address.
' To change the RS-232 port, go to the moudle OpenPort, and change the
' variable COM_Address = "1” to the required port
'"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
Global defaultRM As Long
Global power_supply As Long ' Identifies power supply
Global bGPIB As Boolean ' A flag using of GPIB or RS-232
' Resource manager id for VISA GPIB
Global ErrorStatus As Long ' VISA Error code
Sub Diode_Click()
Range("B5:B15").ClearContents
Dim I As Integer
bGPIB = True
OpenPort
' To use RS-232, set the bGPIB to False
SendSCPI "*RST"
' Set power-on condition
SendSCPI "Output on" ' Turn on the output
For I = 5 To 15
SendSCPI "Volt " & Str$(Cells(I, 1))
Cells(I, 2) = Val(SendSCPI("Meas:Current?"))
Next I
SendSCPI "Output off" ' Turn off the output
ClosePort
End Sub
Private Function OpenPort()
Dim GPIB_Address As String
Dim COM_Address As String
If bGPIB Then
GPIB_Address = "5"
Else
' Select GPIB address between 0 to 30
' Set the number to 2 for COM2 port
COM_Address = "1"
End If
6
ErrorStatus = viOpenDefaultRM(defaultRM)
If bGPIB Then
' Open the VISA session
ErrorStatus = viOpen(defaultRM, "GPIB0::" & GPIB_Address & "::INSTR", _
0, 1000, power_supply)
Else
ErrorStatus = viOpen(defaultRM, "ASRL" & COM_Address & "::INSTR", _
0, 1000, power_supply)
SendSCPI "System:Remote"
End If
CheckError "Unable to open port"
End Function
Continued on next page
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Chapter 6 Application Programs
Example Program for Excel 97
'*********************************************************************************
' This routine send a SCPI command string to the GPIB port or RS-232 port.
' If the command contains a question mark, the response is read, and returned
'**********************************************************************************
Private Function SendSCPI(command As String) As string
Dim commandString As String
Dim ReturnString As String
Dim crlfpos As Integer
' Command passed to power supply
' Store the string returned
' Location of any nul’s in Read Buffer
' Buffer used for returned string
' Number of characters sent/returned
' The instrumented by linefeed
Dim ReadBuffer As String * 512
Dim actual As Long
commandString = command & Chr$(10)
ErrorStatus = viWrite(power_supply, ByVal commandString, Len(commandString), _
actual)
CheckError "Can’t Write to Device"
If bGPIB = False Then
delay 0.5
End If
If InStr(commandString, "?") Then
ErrorStatus = viRead(power_supply, ByVal ReadBuffer, 512, actual)
CheckError "Can’t Read From Device"
ReturnString = ReadBuffer
crlfpos = InStr(ReturnString, Chr$(0))
If crlfpos Then
ReturnString = Left(ReturnString, crlfpos - 1)
End If
SendSCPI = ReturnString
End If
End Function
Private Function ClosePort()
ErrorStatus = viClose(power_supply)
ErrorStatus = viClose(defaultRM)
End Function
Private Function delay(delay_time As Single)
Dim Finish As Single
Finish = Timer + delay_time
Do
Loop Until Finish <= Timer
End Function
Private Function CheckError(ErrorMessage As String)
If ErrorStatus < VI_SUCCESS Then
Cells(5, 2) = ErrorMessage
ClosePort
End
End If
End Function
End of Program
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Chapter 6 Application Programs
Example Program for Excel 97
Declaration for Windows 3.1
'************************************************************************************
' This routine requires the file VISA.dll. It typically resides in the
' c:\windows\system directory. Additional declations for VISA.DLL are usally in file
' visa.bas under c:\vxipnp\win31\include directory on your PC. This routine uses the
' VTL Library to send commands to an instrument. A description of these and additional
' VTL commands are contained in the Hewlett Packard Visa Transition Library book
' Agilent Part Number E2094-90002.
'************************************************************************************
Declare Function viOpenDefaultRM Lib "VISA.DLL" Alias "#141" (viDefaultRM As Long) As Long
DeclareFunctionviOpenLib"VISA.DLL"Alias"#131"(ByValviDefaultRMAsLong,ByVal viDesc
As String, ByVal mode As Long, ByVal timeout As Long, vi As Long) As Long
Declare Function viClose Lib "VISA.DLL" Alias "#132" (ByVal vi As Long) As Long
Declare Function viRead Lib "VISA.DLL" Alias "#256" (ByVal vi As Long, ByVal Buffer As
String, ByVal count As Long, retCount As Long) As Long
Declare Function viWrite Lib "VISA.DLL" Alias "#257" (ByVal vi As Long, ByVal Buffer As
String, ByVal count As Long, retCount As Long) As Long
Declare Function viClear Lib "VISA.DLL" Alias "#260" (ByVal vi As Long) As Long
Declaration for Windows 95/NT 4.0
'************************************************************************************
' Additional declations for VISA32.DLL are usally in file visa32.bas under
' c:\vxipnp\win95(or winNT)\include directory on your PC. Also see the VISA manual
'************************************************************************************
Declare Function viOpenDefaultRM Lib "visa32.dll" (instrumentHandle As Long) As Long
Declare Function viOpen Lib "visa32.dll" (ByVal instrumentHandle As Long, _
ByVal viDesc As String, ByVal mode As Long, ByVal timeout As Long, _
vi As Long) As Long
6
Declare Function viClose Lib "visa32.dll" (ByVal vi As Long) As Long
Declare Function viWrite Lib "visa32.dll" (ByVal vi As Long, ByVal Buffer As String, _
ByVal count As Long, retCount As Long) As Long
Declare Function viRead Lib "visa32.dll" (ByVal vi As Long, ByVal Buffer As String, _
ByVal count As Long, retCount As Long) As Long
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Chapter 6 Application Programs
Example Program for Excel 97
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Tutorial
The Agilent E3633A and Agilent E3634A are high performance instruments
capable of delivering clean dc power. But to take full advantage of the
performance characteristics designed into the power supply, certain basic
precautions must be observed when connecting it for use on the lab bench or
as a controlled power supply. This chapter describes basic operation of linear
power supplies and gives specific details on the operation and use of the
Agilent E3633A and Agilent E3634A DC power supplies:
• Overview of Agilent E3633A and AgilentE3634A Operation, starting on page
147
• Output Characteristics, starting on page 149
• Connecting the Load, starting on page 153
• Extending the Voltage and Current Range, on page 157
• Remote Programming, starting on page 158
• Reliability, on page 160
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Chapter 7 Tutorial
Overview of Agilent E3633A and Agilent E3634A Operation
OverviewofAgilentE3633AandAgilentE3634AOperation
The basic design technique, which has not changed over the years, consists of
placing a control element in series with the rectifier and load device. Figure
7-1 shows a simplified schematic of a series regulated supply with the
phase-controlled pre-regulator described as a power switch and the series
element depicted as a variable resistor. The phase-controlled pre-regulator
minimizes the power dissipated at the series element by maintaining the
voltage drop across the series element at a low and constant. Feedback control
circuits continuously monitor the output and adjust the series resistance to
maintain a constant output voltage. Because the variable resistance of Figure
7-1 is actually one or more power transistor operating in the linear (class A)
mode, supplies with this type of regulator are often called linear power
supplies. Linear power supplies have many advantages and usually provide the
simplest most effective means of satisfying high performance and low power
requirements.
Figure 7-1. Diagram of Simple Series Power Supply
This power supply has two ranges, allowing more voltage at a lower current.
To maintain the voltage across the pre-regulator efficient in accordance with
the demands imposed by the dc output voltage and current of the supply, this
power supply also uses the pre-regulator which is controlled by transformer
tap switching before the rectifier bridge in the Figure 7-1. This is one of several
techniques using semiconductors for preregulation to reduce the power
dissipated across the series element.
7
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Chapter 7 Tutorial
Overview of Agilent E3633A and Agilent E3634A Operation
In terms of performance, a linear regulated supply has a very precise regulating
properties and responds quickly to variations of the line and load. Hence, its
line and load regulation and transient recovery time are superior to supplies
using other regulation techniques. The power supply also exhibits low ripple
and noise, is tolerant of ambient temperature changes, and with its circuit
simplicity, has a high reliability.
The Agilent E3633A and Agilent E3634A contain a linear regulated power
supply. It is controlled by a control circuit that provides voltages to program
the outputs. The power supply sends back to the control circuits a voltage
representing the output at the terminals. The control circuits receive
information from the front panel and send information to the display. Similarly
the control circuits ‘’talk’’ to the remote interface for input and output with the
GPIB and RS-232 interfaces. The remote interface is at earth ground and
optically isolated from the control circuit and the power supply.
OPTICAL
ISOLATION
GPIB
+
-
POWER
SUPPLY
OUTPUT
CONTROL
DISPLAY
RS-232
Figure 7-2. Block Diagram of the Power Supply Showing the Optical Isolation
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Chapter 7 Tutorial
Output Characteristics
Output Characteristics
An ideal constant-voltage power supply would have a zero output impedance
at all frequencies. Thus, as shown in Figure 7-3, the voltage would remain
perfectly constant in spite of any changes in output current demanded by the
load.
Figure 7-3. Ideal Constant Voltage
Power Supply
Figure 7-4. Ideal Constant Current
Power Supply
The ideal constant-current power supply exhibits an infinite output impedance
at all frequencies. Thus as Figure 7-4 indicates, the ideal constant-current
power supply would accommodate a load resistance change by altering its
output voltage by just the amount necessary to maintain its output current at
a constant value.
The output of the E3633A and E3634A power supplies can operate in either
constant-voltage (CV) mode or constant-current (CC) mode. Under certain
fault conditions, the power supply can not operate in either CV or CC mode
and becomes unregulated.
7
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Chapter 7 Tutorial
Output Characteristics
Figure 7-5 shows the operating modes of the output of the Agilent E3633A and
AgilentE3634Apowersupplies.Theoperatingpointofonesupplywillbeeither
above or below the line RL = RC. This line represents a load where the output
voltage and the output current are equal to the voltage and current setting.
When the load RL is greater than RC, the output voltage will dominate since
the current will be less then the current setting. The power supply is said to be
in constant voltage mode. The load at point 1 has a relatively high resistance
value (compared to RC), the output voltage is at the voltage setting, and the
output current is less than the current setting. In this case the power supply is
in the constant voltage mode and the current setting acts as a current limit.
Figure 7-5. Output Characteristics
When the load RL is less than RC, the output current will dominate since the
voltage will be less than the set voltage. The power supply is said to be in
constant current mode. The load at point 2 has a relatively low resistance, the
output voltage is less than the voltage setting, the output current is at the
current setting. The supply is in constant current mode and the voltage setting
acts as a voltage limit.
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Chapter 7 Tutorial
Output Characteristics
Unregulated State
If the power supply should go into a mode of operation that is neither CV or
CC, the powersupply isunregulated. Inthismode the outputisnotpredictable.
The unregulated condition may be the result of the ac line voltage below the
specifications. The unregulated condition may occur momentarily. For
example when the output is programmed for a large voltage step; the output
capacitor or a large capacitive load will charge up at the current limit setting.
During the ramp up of the output voltage the power supply will be in the
unregulated mode. During the transition from CV to CC as when the output is
shorted, the unregulated state may occur briefly during the transition.
Unwanted Signals
An ideal power supply has a perfect dc output with no signals across the
terminals or from the terminals to earth ground. The actual power supply has
finite noise across the output terminals, and a finite current will flow through
any impedance connected from either terminal to earth ground. The first is
called normal mode voltage noise and the second common mode current
noise. Figure 7-6 shows the simplified diagram of common mode and normal
mode sources of noise.
Normal mode voltage noise is in the form of ripple related to the line frequency
plus some random noise. Both of these are of very low value in the Agilent
E3633A and Agilent E3634A. Careful lead layout and keeping the power supply
circuitry away from power devices and other noise sources will keep these
values low.
Common mode noise can be a problem for very sensitive circuitry that is
referenced to earth ground. When a circuit is referenced to earth ground, a low
level line—related ac current will flow from the output terminals to earth
ground. Any impedance to earth ground will create a voltage drop equal to the
current flow multiplied by the impedance. To minimize this effect, the output
terminal can be grounded at the output terminal. Alternately, any impedances
to earth ground should have a complementary impedance to earth ground to
cancel any generated voltages. If the circuit is not referenced to earth ground,
common mode power line noise is typically not a problem.
The output will also change due to changes in the load. As the load increases
the output current will cause a small drop in the output voltage of the power
supply due to the output impedance R. Any resistance in the connecting wire
will add to this resistance and increase the voltage drop. Using the largest
possible hook up wire will minimize the voltage drop. Using the remote sense
leads at the load will compensate for lead resistance in the load leads.
7
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Chapter 7 Tutorial
Output Characteristics
(E3633A)
(E3634A)
Figure 7-6. Simplified Diagram of Common Mode and Normal Mode
Sources of Noise
When the load changes very rapidly, as when a relay contact is closed, the
inductance in the hook up wire and in the power supply output will cause a
spike to appear at the load. The spike is a function of the rate of change of the
load current. When very rapid changes in load are expected, a capacitor with
a low series resistance, in parallel with the power supply, and close to the load
is the best way to minimize these voltage spikes.
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Chapter 7 Tutorial
Connecting the Load
Connecting the Load
Output Isolation
The output of the power supply is isolated from chassis ground. Any output
terminal may be grounded, or an external voltage source may be connected
between any terminal output and ground. However, output terminals must be
kept within 60 Vdc when metal shorting bars without insulation are used to
connect the (+) output to the (+) sense and the (-) output and the (-) sense
terminals or 240 Vdc of ground when metal shorting bars without insulation
are either replaced with insulated conductors or they are removed from the
terminals so there is no operator access to the output conductors without
insulation. A chassis ground terminal is provided on the front panel for
convenience.
Multiple Loads
When connecting multiple loads to the power supply, each load should be
connected to the output terminals using separate connecting wires. This
minimizes mutual coupling effects between loads and takes full advantage of
the low output impedance of the power supply. Each pair of wires should be
as short as possible and twisted or shielded to reduce lead inductance and
noise pick-up. If a shield is used, connect one end to the power supply ground
terminal and leave the other end disconnected.
If cabling considerations require the use of distribution terminals that are
located remotely from the power supply, connect output terminals to the
distribution terminals by a pair of twisted or shielded wires. Connect each load
to the distribution terminals separately.
Table 7-1 Wire Rating
AWG
10
40
12
25
14
20
16
13
18
10
20
7
22
5
24
26
28
Suggested
maximum
Current(amps)*
3.5
2.5
1.7
m9/ft
1.00
3.3
1.59 2.53 4.02 6.39 10.2 16.1 25.7 40.8 64.9
5.2 8.3 13.2 21.0 33.5 52.8 84.3 133.9 212.9
m9/m
*Single conductor in free air at 30 °C with insulation
7
W a r n i n g
To satisfy safety requirements, load wires must be heavy enough not to overheat while
carrying the short-circuit output current of the power supply.
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Chapter 7 Tutorial
Connecting the Load
Remote Voltage Sensing
Normally, a power supply operating in the constant voltage mode achieves its
optimum line and load regulations, its lowest output impedance, drift, and
ripple and noise, and its fastest transient recovery performance at the power
supply output terminals. If the load is separated from the output terminals by
any lead length, some of these performance characteristics will be degraded
at the load terminals - usually by an amount proportional to the impedance of
the load leads compared with the output impedance of the power supply.
With remote voltage sensing, a feature included in the Agilent E3633A and
E3634A power supplies, it is possible to connect the input of the voltage
feedback amplifier directly to the load terminals so that the regulator performs
its function with respect to the load terminals rather than with respect to the
power supply output terminals. Thus, the voltage at the power supply output
terminals shifts by whatever amount is necessary to compensate for the
voltage drop in the load leads, thereby maintaining the voltage at the load
terminals constant.
Figure 7-7. Regulated Power Supply with Remote Sensing
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Chapter 7 Tutorial
Connecting the Load
Load Consideration
Capacitive Loading
In most cases, the power supply will be stable for almost any size load
capacitance. Large load capacitors may cause ringing in the power supply’s
transientresponse. Itispossible thatcertaincombinationsofloadcapacitance,
equivalent series resistance, and load lead inductance will result in instability.
If this occurs, the problem may often be solved by either increasing or
decreasing the total load capacitance.
A large load capacitor may cause the power supply to cross into CC or
unregulated mode momentarily when the output voltage is reprogrammed.
The slew rate of the output voltage will be limited to the current setting divided
by the total load capacitance (internal and external).
Table 7-2. Slew Rate
Internal
Capacitance
Internal Bleed
Resistor
Slew Rate at No Load and
Full Scale Currnet Setting
470 uF x 2 ea
3 K9
0.44 V/msec
Inductive loading
Inductive loads present no loop stability problems in constant voltage mode.
In constant current mode, inductive loads form a parallel resonance with the
power supply’s output capacitor. Generally this will not affect the stability of
the power supply, but it may cause ringing of the current in the load.
Pulse Loading
In some applications the load current varies periodically from a minimum to
a maximum value. The constant currentcircuit limitsthe output current. Some
peak loading exceeding the current limit can be obtained due to the output
capacitor. To stay within the specifications for the output, the current limit
should be set greater than the peak current expected or the supply may go into
CC mode or unregulated mode for brief periods.
7
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Chapter 7 Tutorial
Connecting the Load
Reverse Current Loading
An active load connected to the power supply may actually deliver a reverse
current to the supply during a portion of its operating cycle. An external source
can not be allowed to pump current into the supply without risking loss of
regulation and possible damage. These effects can be avoided by preloading
the output with a dummy load resistor. The dummy load resistor should draw
at least the same amount of current from the supply as the active load may
deliver to the supply. The value of the current for the dummy load plus the
value of the current the load draws from the supply must be less than the
maximum current of the supply.
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Chapter 7 Tutorial
Extending the Voltage and Current Range
Extending the Voltage and Current Range
The power supply may be able to provide voltages and currents greater than
its rated maximum outputs if the power-line voltage is at or above its nominal
value. Operation can be extended up to 3% over the rated output without
damage to the power supply, but performance can not be guaranteed to meet
specificationsinthisregion.Ifthepower-linevoltage ismaintainedintheupper
end of the input voltage range, the power supply will probably operate within
its specifications. The power supply is more likely to stay within specifications
if only one of the voltage or current outputs is exceeded.
Series Connections
Series operation of two or more power supplies can be accomplished up to the
output isolation rating of any one supply to obtain a higher voltage than that
available from a single supply. Series connected power supplies can be
operated with one load across both power supplies or with a separate load for
each power supply. The power supply has a reverse polarity diode connected
across the output terminals so that if operated in series with other power
supplies, damage will not occur if the load is short-circuited or if one power
supply is turned on separately from its series partners.
When series connection is used, the output voltage is the sum of the voltages
of the individual power supplies. The current is the current of any one power
supply. Each of the individual power supplies must be adjusted in order to
obtain the total output voltage.
Parallel Connections
Two or more power supplies being capable of CV/CC automatic cross over
operation can be connected in parallel to obtain a total output current greater
than that available from one power supply. The total output current is the sum
of the output currents of the individual power supplies. The output of each
power supply can be set separately. The output voltage controls of one power
supply should be set to the desired output voltage; the other power supply
should be set for a slightly higher output voltage. The supply with the higher
output voltage setting will deliver its constant current output, and drop its
output voltage until it equals the output of the other supply, and the other
supply will remain in constant voltage operation and only deliver that fraction
of its rated output current which is necessary to fulfill the total load demand.
7
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Chapter 7 Tutorial
Remote Programming
Remote Programming
During remote programming a constant-voltage regulated power supply is
called upon to change its output voltage rapidly. The most important factor
limiting the speed of output voltage change is the output capacitor and load
resistor.
Figure 7-8. Speed of Response - Programming Up (Full Load)
The equivalent circuit and the nature of the output voltage waveform when the
supply is being programmed upward are shown in Figure 7-8. When the new
output is programmed, the power supply regulator circuit senses that the
output is less than desired and turns on the series regulator to its maximum
value IL, the current limit or constant current setting.
This constant current IL charges the output capacitor CO and load resistor RL
parallel. The output therefore rises exponentially with a time constant RLCL
towards voltage level ILRL , a value higher than the new output voltage being
programmed.
When this exponential rise reaches the newly programmed voltage level, the
constant voltage amplifier resumes its normal regulating action and holds the
output constant. Thus, the rise time can be determined approximately using
the formula shown in Figure 7-8.
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Chapter 7 Tutorial
Remote Programming
If no load resistor is attached to the power supply output terminal, then the
output voltage will rise linearly at a rate of CO/IL when programmed upward,
and TR = CO(E2 -E1 )/IL, the shortest possible up-programming time.
Figure 7-9. Speed of Response - Programming Down
Figure 7-9 shows that when the power supply is programmed down, the
regulator senses that the output voltage is higher than desired and turns off
the series transistors entirely. Since the control circuit can in no way cause the
series regulator transistors to conduct backwards, the output capacitor can
only be discharged through the load resistor and internal current source (IS).
The output voltage decays linearly with slope of IS/CO with no load and stops
falling when it reaches the new output voltage which has been demanded. If
full load is connected, the output voltage will fall exponentially faster.
Sinceup-programmingspeedisaidedby theconductionoftheseriesregulating
transistor, while down programming normally has no active element aiding in
the discharge of the output capacitor, laboratory power supplies normally
program upward more rapidly than downward.
7
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Chapter 7 Tutorial
Reliability
Reliability
Reliability of electronic semiconductor equipment depends heavily on the
temperature of the components. The lower the temperature of the
components, the better the reliability. The Agilent E3633A and Agilent E3634A
power supplies incorporate circuitry to reduce the internal power dissipation
of the power supply and therefore reduce the internal heat of the power supply.
Maximum internal power dissipation occurs at maximum current. The internal
power dissipation further increases as the output voltage is lowered. A fan
internal to the power supply is essential to keep internal temperatures low. To
assist in cooling the power supply, the sides and rear of the power supply
should be kept clear.
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Specifications
The performance specifications are listed in the following pages.
Specifications are warranted in the temperature range of 0 to 40°C with a
resistive load. Supplemental characteristics, which are not warranted but
are descriptions of performance determined either by design or testing. The
Service Guide contains procedures for verifying the performance
specifications.
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Chapter 8 Specifications
Performance Specifications
Performance Specifications
Table 1-1. Performance Specifications
Parameter
Agilent E3633A
Agilent E3634A
Output Ratings
(@ 0 °C - 40 °C)
Low Range
High Range
Voltage
0 to +8 V/0 to 20 A 0 to +25 V/0 to 7 A
0 to +20 V/0 to 10 A 0 to +50V/0 to 4 A
0.05% + 10 mV
[1]
Programming Accuracy
12 months (@ 25 °C 5 °C),
(% of output + offset)
Current
0.2% + 10 mA
[1]
Readback Accuracy
Voltage
Current
0.05% + 5 mV
0.15% + 5 mA
12 months (over GPIB and
RS-232 or front panel with
respecttoactualoutput@25°C
5 °C), (% of output + offset)
Ripple and Noise
Normal mode <0.35 mV rms and <0.5 mV rms and
3 mV p-p
(with outputs ungrounded, or voltage
with either output terminal
grounded, 20 Hz to 20 MHz)
3 mV p-p
Normal mode
<2 mA rms
current
Common mode
current
<1.5 uA rms
Load Regulation,
(% of output + offset)
Voltage
Current
Voltage
Current
<0.01% + 2 mV
<0.01% + 250 uA
<0.01% + 2 mV
<0.01% + 250 uA
3 mV
Line Regulation,
(% of output + offset)
Programming Resolution Voltage
1 mV
1 mA
0.5 mV
1 mA
Current
0.5 mA
Readback Resolution
Front Panel Resolution
Voltage
Current
Voltage
Current
1.5 mV
0.5 mA
1 mV
1 mA (< 10A), 10mA (³ 10A)
[1]Accuracy specifications are after an 1-hour warm-up with no load and
calibration at 25 °C.
8
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Chapter 8 Specifications
Performance Specifications
Transient Response Time
Less than 50 msec for output to recover to within 15 mV following a change in
output current from full load to half load or vice versa
Command Processing Time
Average time for output voltage to begin to change after receipt of digital data
when the power supply is connected directly to the GPIB or RS-232 is less than
100 msec
OVP and OCP Accuracy, (% of output + offset)
OVP
OCP
0.5% + 0.5 V
0.5% + 0.5 A
Activation time : Average time for output to start to drop after OVP or OCP
condition occurs.
OVP
OCP
<1.5 msec when the trip voltage is equal or greater than 3 V
<10 msec when the trip voltage is less than 3 V
<10 msec
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Chapter 8 Specifications
Supplemental Characteristics
Supplemental Characteristics
Table 1-2. Supplemental Characteristics
Parameter
Agilent E3633A
Agilent E3634A
Output Programming Range Low Range
(maximum programmable values)
0 to +8.24 V/
0 to 20.6 A
0 to +25.75 V/
0 to 7.21 A
High Range
0 to +20.6 V/
0 to 10.3 A
0 to +51.5V/
0 to 4.12 A
OVP
OCP
1
V
to
to
0
A
Voltage Programming
Speed: Maximum time required
for output voltage to settle within
1% of its total excursion (for
resistive load). Excludes
command processing time.
Full Load No Load Full Load No Load
Up
95 msec 45 msec 80 msec 100 msec
30 msec 450 msec 30 msec 450 msec
Down
Remote Sensing Capability
Voltage drop
Up to 0.7 V per each lead
Load regulation Add 5 mV to spec for each 1-volt change in the + output
lead due to load current changes.
Load voltage
Subtract voltage drop in load leads from specified output
voltage rating.
Temperature Coefficient, (% of output + offset)
Maximum change in output/readback per °C after a 30-minute warm-up
Voltage
Current
0.01% + 3 mV
0.02% + 3 mA
Stability, (% of output + offset)
Following 1 hour warm-up, change in output over 8 hours under constant load,
line, and ambient temperature
Voltage
Current
0.02% + 1 mV
0.1% + 1 mA
8
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Chapter 8 Specifications
Supplemental Characteristics
Output Voltage Overshoot
During turn-on or turn-off of ac power, output plus overshoot will not exceed
1 V if the output control is set to less than 1 V. If the output control is set to
1 V or higher, there is no overshoot.
Programming Language
SCPI (Standard Commands for Programmable Instruments)
State Storage Memory
Three (3) user-configurable stored states
Recommended Calibration Interval
1 year
Output Terminal Isolation (maximum, from chassis ground)
60 Vdc when connecting shorting conductors without insulation to the
(+) output to the (+) sense and the (-) output and the (-) sense terminals.
240 Vdc when connecting insulated shorting conductors to the (+) output
to the (+) sense and the (-) output and the (-) sense terminals.
AC Input Ratings (selectable via rear panel selector)
std
115 Vac 10%, 47 to 63 Hz
230 Vac 10%, 47 to 63 Hz
100 Vac 10%, 47 to 63 Hz
opt 0E3
opt 0E9
Maximum Input Power
700 VA with full load
Cooling
Fan cooled
Operating Temperature
0 to 40 °C for full rated output. At higher temperatures, the output current is
derated linearly to 50% at 55 °C maximum temperature.
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Chapter 8 Specifications
Supplemental Characteristics
Storage Temperature
-20 to 70 °C for storage environment.
Environmental Conditions
Designed for indoor use in an installation category II, pollution degree 2
environment. Designed to operate at a maximum relative humidity of 95 %
and at altitudes of up to 2000 meters.
Dimensions*
213 mmW x 133 mmH x 348 mmD (8.4 x 5.2 x 13.7 in)
*See below for detailed information.
Weight
Net
9.5 kg (21 lb)
12 kg (26 lb)
Shipping
Figure 8-1. Dimensions of Agilent E3633A and E3634A Power Supplies
8
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Chapter 8 Specifications
Supplemental Characteristics
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Index
If you have questions relating to the operation of the power supply,
call 1-800-452-4824 in the United States, or contact your nearest
Agilent Technologies Sales Office.
commands(calibration)
CALibration:CURRent:LEVel
commands(RS-232 Interface)
Ctrl-C 101
A
AC input ratings 166
accessories 15
active load 156
address, GPIB 58
annunciators, display 5
asterisk ( * ) 116
SYSTem:LOCal 101
SYSTem:REMote 101
SYSTem:RWLock 101
CALibration:CURRent:PRO-
CALibration:CURRent[:DATA]
CALibration:SECure:STATe?
CALibration:VOLTage:LEVel
commands(status reporting)
*CLS 111
*ESE 111
*ESE? 111
*ESR? 111
*OPC 111
*OPC? 111
*PSC { 0 | 1 } 111
*PSC? 112
*SRE 112
*SRE? 112
*STB? 112
*WAI 112
STATus:QUEStionable:CONDi-
tion? 110
STATus:QUEStionable:ENABle
STATus:QUEStionable:EN-
ABle? 111
STATus:QUEStionable? 110
SYSTem:ERRor? 110
B
basic tests
preliminary checkout 27
battery charging 45
baud rate selection (RS-232) 59
baud rate setting 61
bus controller, interrupt 108
CALibration:VOLTage:PRO-
CALibration:VOLTage[:DATA]
commands(output setting and
measurement)
APPLy 83
C
C programming example 135
calibration 68
APPLy? 83
disable security code 68
factory security code 69
Front-Panel Operation 69
interval (recommended) 166
Remote Interface Operation 69
secure 68
CURRent:PROTection:STATe?
CURRent:PROTec-
VOLTage:PROTection:STATe?
VOLTage:PROTec-
*IDN? 96
*RCL { 1 | 2 | 3 } 97
*RST 96
*SAV { 1 | 2 | 3 } 97
*TST? 97
DISPlay {OFF | ON} 94
DISPlay:TEXT 94
DISPlay:TEXT:CLEar 94
DISPlay:TEXT? 94
DISPlay? 94
OUTPut {OFF | ON} 94
OUTPut:RELay {OFF | ON} 95
OUTPut:RELay? 95
OUTPut? 94
security code 68
unsecure 68
calibration commands 98
character frame 64
checkout
current output 30
preliminary 27
voltage output 29
colon 115
command processing time 164
command separators
colon 115
semicolon 115
command syntax 114
SYSTem:BEEPer 95
SYSTem:ERRor? 95
SYSTem:VERSion? 96
commands(triggering)
*TRG 93
INITiate 93
TRIGger:DELay 93
TRIGger:DELay? 93
TRIGger:SOURce 93
TRIGger:SOURce? 93
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Index
common commands (IEEE-488.2) 116
common mode current noise 151
connection to a computer or terminal
DB-25 Serial Connection 66
DB-9 Serial Connection 65
GPIB connector 63
connections(power supplies)
parallel connections 157
series connections 157
null-modem adapters 65
RS-232 cable 15
wiring adapter 65
F
feedback control circuits 147
firmware revision query 57
first-in-first-out (FIFO) order 124
float voltage
with insulation 18
without insulation 17
front panel
internal bleed resistor 155
internal capacitance 155
K
key descriptions (front panel) 3
keyword(s)
annunciators 5
key descriptions 3
layout 2
connector
GPIB 63
lower-level 113
root 113
second-level 113
third-level 113
knob locking 53
RS-232 (serial) 64
operation overview 35
front panel resolution 163
fuse rating 27
G
GPIB
L
limit mode 35
line fuse (100, 115, or 230 Vac) 27
line regulation 163
load capacitors 155
coupling effects 153
current limit 38
bus address 59
bus controller 59
connector 63
D
deadlock 67
device specific commands 121
dimensions of power supply 167
disabling output 52
interface configuration 63
GPIB address
load consideration
capacitive loading 155
inductive loading 155
pulse loading 155
factory setting 28
setting GPIB Address 60
display control (front panel) 56
distribution terminals 153
down-programming response 159
DSR (Data Set Ready) 66
DTE (Data Terminal Equipment) 66
DTR (Data Terminal Ready) 66
DTR/DSR handshake protocol 66
dummy load resistor 156
reverse current loading 156
load regulation 163
local voltage sensing connections
at the front panel 50
at the rear panel 51
locking control knob 53
low-level commands 80
H
halting an output 118
hierarchical structure 113
I
ideal constant-current power supply
ideal constant-voltage power supply
ideal power supply 151
IEEE-488
conformance information 122
IEEE-488.2
E
M
macro 140
memory locations (1-3) 97
message available bit (MAV) 108
meter mode 28
MIN and MAX Parameters 115
multiple loads 153
mutual coupling effects 153
enable register? 102
environmental conditions 167
error conditions 55
error messages 124
error queue 124
common commands 116
initial inspection
error string 124
error trapping 135
errors
calibration 131
electrical check 19
mechanical check 19
input power (maximum) 166
input power requirements 22
installation 19
N
noise
excution 125
self-test 130
event register 102
example program for C and C 135
example program for Excel 97 139
Excel Macros 139
external voltage source 153
common mode 152
normal mode 152
non-SCPI commands 121
non-volatile memory 40
interface cable
Agilent 34399A adapter Kit 65
DB-25 connector 65
DB-9 connector 65
gender changers 65
GPIB cable 15
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Index
conformance information 119
device-specific 121
O
R
rack-mounting
for a single instrument 20
in a sliding support shelf 21
two instrument side-by-side 21
rack-mounting kit
OCP(Overcurrent Protection)
checking OCP operation 47
clearing overcurrent condition 47
enable the OCP circuit 46
remote interface operation 48
setting the OCP level 46
trip level setting 46
operating temperature 166
output buffer 106
output characteristics 149
output impedance 149
output Isolation 153
language introduction 113
non-SCPI commands 121
status registers 102
version query 57
adapter kit 20
flange kit 21
lock-link kit 21
shelf 21
slide kit 21
SCPI parameters
Boolean 117
Discrete 117
Numeric 117
String 117
scrolling speed, error text 124
self-test
complete 54
power-on 54
to perform 54
semicolon 115
series element 147
series operation, connection 157
series regulated supply 147
series resistance 147
service request (SRQ) interrupt 107
shorting bars 51
slew rate 155
speed of response
down programming 159
up-programming 158
square brackets 75
readback accuracy 163
readback resolution 163
rear output terminals 51
rear panel
output programming range 165
output ratings 163
output setting and operation commands
GPIB (IEEE-488) interface connec-
tor 6
layout 6
output state (on,off) 52
output terminal isolation 166
output voltage overshoot 166
OVP (Overvoltage Protection)
checking OVP Operation 43
clearing overvoltage condition 43
enabling OVP 42
output terminals 6
RS-232 interface connector 6
recalling operating states 40
reliability 160
remote interface selection 58
remote programming 158
remote sensing capability 165
remote voltage sensing
at the front panel 49
at the rear terminals 49
connections 50
remote interface operation 44
setting OVP level 42
trip level setting 42
OVP and OCP accuracy 164
standard event register 105
start bits (RS-232) 64
State Storage Memory 166
status byte query (*STB) 108
status byte summary register 106
status reporting commands 110
stop bits (RS-232) 64
storage temperature 167
storing operating states 40
subsystems 113
P
resister
enable register 102
event register 102
parallel connections 157
parameter types (SCPI) 117
parity selection (RS-232) 59
performance specifications 163
phase-controlled pre-regulator 147
power dissipation 160
power-line cord 22
Power-line voltage selection 22
preliminary checkout 27
pre-regulator 147
programming accuracy 163
programming language 166
programming ranges (voltage/current)
event status enable command 105
questionable status 104
questionable status enable 104
questionable status event 104
standard event 105
status byte 106
status byte summary 106
reverse current 156
reverse polarity diode 157
ripple and noise 163
RS-232
supplemental characteristics 165
system-related commands 94
T
Configuration 64
temperature coefficient 165
transformer tap switching 147
transient response time 164
tree system 113
Data Frame Format 64
interface selection 58
troubleshooting 67
programming resolution 163
triangle brackets 75
trigger source
bus (software) 81
immediate internal trigger 81
Trigger Source Choices
Bus (Software) Triggering 91
Q
query data 106
query response reading 81
questionable status register 104
S
SCPI
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Index
U
unregulated state (condition) 151
up-programming response 158
V
variable resistor 147
vertical bar 75
VFD 17
VISA 134
VISA functionality 135
visa.dll 134
visa32.dll 134
Visual Basic 139
voltage limit 36
voltage programming speed 165
voltage spikes 152
W
weight of power supply 167
wire rating 153
wires sizes 51
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Warranty Service
Exclusive Remedies
Safety Information
Copyright© 1998 - 2000
Agilent Technologies
All Rights Reserved.
For warranty service or
repair, this product must be
returned to a service facility
designated by Agilent.
To the extent allowed by
local law, the remedies pro-
vided herein are the Buyer’s
sole and exclusive remedies.
Agilent shall not be liable for
any direct, indirect, special,
incidental, or consequential
damages (including lost
profit or data), whether
based on warranty, contract,
tort, or any other legal the-
ory.
Do not install substitute
parts or perform any
unauthorized modification
to the product. Return the
product to an HP Sales and
Service Office for service
and repair to ensure that
safety features are main-
tained.
Printing History
Edition 1, November 1998
Edition 2, April 2000
For products returned to
Agilent for warranty service,
the Buyer shall prepay ship-
ping charges to Agilent and
Agilent shall pay shipping
charges to return the prod-
uct to the Buyer. However,
the Buyer shall pay all ship-
ping charges, duties, and
taxes for products returned
to Agilent from another
country.
New editions are complete
revisions of the manual.
Update packages, which are
issued between editions,
may contain additional
information and replace-
ment pages which you
merge into the manual. The
dates on this page change
only when a new edition is
published.
Safety Symbols
Warning
Notice
Calls attention to a proce-
dure, practice, or condition,
that could possibly cause
bodily injury or death.
The information contained
in this document is subject
to change without notice.
Limitation of Warranty
To the extent allowed by
local law, Agilent makes no
warranty of any kind with
regard to this material,
including, but not limited to,
the implied warranties of
merchantability and fitness
for a particular purpose.
Caution
The foregoing warranty
shall not apply to defects
resulting from improper or
inadequate maintenance by
the Buyer, Buyer-supplied
products or interfacing,
unauthorized modification
or misuse, operation outside
of the environmental specifi-
cations for the product, or
improper site preparation or
maintenance.
Trademark Information
Calls attention to a proce-
dure, practice, or condition
that could possibly cause
damage to equipment or per-
manent loss of data.
Windows, Windows 95, and
Windows NT are registered
trademarks of Microsoft
Corp.
Certification
Agilent Technologies
To the extent allowed by
local law, Agilent shall not
be liable for errors con-
tained herein or for inciden-
tal or consequential
damages in connection with
the furnishing, performance,
or use of this material. No
part of this document may
be photocopied, repro-
duced, or translated to
another language without
the prior written consent of
Agilent.
certifies that this product
met its published specifica-
tions at the time of ship-
ment. Agilent further
Earth ground symbol.
The design and implementa-
tion of any circuit on this
product is the sole responsi-
bility of the Buyer. Agilent
does not warrant the
Buyer’s circuitry or malfunc-
tions of Agilent products
that result from the Buyer’s
circuitry. In addition, Agilent
does not warrant any dam-
age that occurs as a result of
the Buyer’s circuit or any
defects that result from
certifies that its calibration
measurements are trace-
able to the United States
National Institute of Stan-
dards and Technology (for-
merly National Bureau of
Standards), to the extent
allowed by that organiza-
tion’s calibration facility,
and to the calibration facili-
ties of other International
Standards Organization
members.
Chassis ground symbol.
Restricted Rights
The Software and Documen-
tation have been developed
entirely at private expense.
They are delivered and
licensed as “commercial
computer software” as
defined in DFARS 252.227-
7013 (Oct 1988), DFARS
252.211-7015 (May 1991), or
DFARS 252.227-7014 (Jun
1995), as a “commercial
item” as defined in FAR
2.101(a), or as “restricted
computer software” as
defined in FAR 52.227-19
(Jun 1987) (or any equiva-
lent agency regulation or
contract clause), whichever
is applicable. You have only
those rights provided for
such Software and Docu-
mentation by the applicable
FAR or DFARS clause or the
Agilent standard software
agreement for the product
involved.
!
Buyer-supplied products.
Warranty
Refer to the manual for
specific Warning or Caution
information to avoid per-
sonal injury or equipment
damage.
To the extent allowed by
local law, Agilent makes
no other warranty,
expressed or implied,
whether written or oral
with respect to this prod-
uct and specifically dis-
claims any implied
warranty or condition of
merchantability, fitness
for a particular purpose
or satisfactory quality.
This Agilent product is war-
ranted against defects in
materials and workmanship
for a period of three years
from date of shipment.
Duration and conditions of
warranty for this product
may be superseded when
the product is integrated
into (becomes a part of)
other Agilent products.
During the warranty period,
Agilent will, at its option,
either repair or replace
products which prove to be
defective. The warranty
period begins on the date of
delivery or on the date of
installation if installed by
Agilent.
Hazardous voltages may be
present.
Warning
No operator serviceable
parts inside. Refer servicing
to service-trained personnel.
For transactions in Austra-
lia and New Zealand: The
warranty terms contained in
this statement, except to the
extent lawfully permitted,
do not exclude, restrict, or
modify and are in addition
to the mandatory statutory
rights applicable to the sale
of this product.
Warning
For continued protection
against fire, replace the line
fuse only with a fuse of the
specified type and rating.
Manual Part Number: E3634-90001
Printed: April 2000 Edition 2
Printed in Korea
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DECLARATION OF CONFORMITY
according to ISO/IEC Guide 22 and EN 45014
Manufacturer’s Name:
Agilent Technologies, Inc.
Manufacturer’s Address:
345-15, Kasan-dong, Kumchon-ku,
Seoul 153-023 Korea
declares, that the products
Product Name:
DC Power Supply
E3633A and E3634A
All Options
Model Numbers:
Product Options:
conforms to the following Product Specifications:
Safety:
EMC:
IEC 1010-1:1990+A1:1992 / EN 61010-1:1993+A2:1995
EN 61326-1 : 1997
CISPR 11:1990 / EN 55011:1991 Group 1 Class A
EN 61000-4-2 (1995) / IEC 61000-4-2 (1995)
EN 61000-4-3 (1996) / IEC 61000-4-3 (1995)
ENV 50204 (1995)
- Criteria A
- Criteria A
EN 61000-4-4 (1995) / IEC 61000-4-4 (1995)
EN 61000-4-5 (1995) / IEC 61000-4-5 (1995)
EN 61000-4-6 (1996) / IEC 61000-4-6 (1996)
EN 61000-4-8 (1993) / IEC 61000-4-8 (1993)
- Criteria A
- Criteria A
- Criteria A
- Criteria A
EN 61000-4-11 (1994) / IEC 61000-4-11 (1994) - Criteria C
Supplementary Information: The products herewith comply with the requirements of the
Low Voltage Directive 73/23/EEC and the EMC Directive 89/336/EEC and carry the “CE”
mark accordingly.
Seoul, Korea
November 1, 1999
Quality Manager
European Contact for regulatory topics only: Hewlett-Packard GmbH, HQ-TRE, Herrenberger Strabe 110-140,
D-71034 Böbligen (FAX: +49-7031-143143).
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