SRS Labs Stereo Amplifier SR560 User Manual

MODEL SR560

LOW-NOISE PREAMPLIFIER

1290-D Reamwood Avenue

Sunnyvale, CA 94089 U.S.A.

(408) 744-9040

Stanford Research Systems

Revision 2.8

(12/2006)

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TABLE OF CONTENTS

Introduction and Setup

Instrument Overview

Preparation for Use

Line Voltage

Line Fuse

Line Cord

Ventilation

Power-Up

Repackaging for Shipment

Use in Biomedical Applications

Warning Regarding Use with Photomultipliers

Accessories Furnished

Environmental Conditions

Symbols

Specifications

SR560 Low Noise Preamplifier Specifications Chart

Operation and Controls

Front Panel Operating Summary

Power

Source

Filters

Gain Mode

Gain

Output

Reset

Status

Rear Panel Operating Summary

AC Power Input

Amplifier Power Output

Battery Charger

Blanking Input

RS-232 Interface

Battery Care and Usage

Recharging

Battery Care

Circuit Description

Differential Low-Noise Front End

Configurable Filters and Gain

Output Stages

Overload Detection

Microprocessor

Battery Charger and Pre-regulators

Power Regulators

Rear Panel Interfaces

Batteries and P.E.M.

Front Panel

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TABLE OF CONTENTS

Calibration and Repair

Offset Adjustment

Calibration

Front End Replacement

SR560 Offset Adjustment Procedure

Battery Replacement

Fuse Replacement

Noise Contours

Input Voltage Noise

Dynamic Reserve

Appendix A

Remote Programming

Introduction

Commands

A-1

Appendix B

Noise Sources and Cures

Intrinsic Noise Sources

Johnson Noise

B-1

B-2

B-3

'1/f' Noise

Others

Non-Essential Noise Sources

Capacitive Coupling

Inductive Coupling

Resistive Coupling ('Ground Loops')

Microphonics

Thermocouple Effect

SR560 - Component List

Front Panel Board

Main Board

C-1

C-2

Miscellaneous Parts

C-13

D-1

PCB - SR560 Revision F (9/89)

Schematics

E-1 to E-10

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INTRODUCTION AND SETUP

Figure 1: SR560 Block Diagram

INSTRUMENT OVERVIEW

The SR560 architecture is diagrammed

above. The instrument provides DC-

BNC amplifier" with the amplifier ground

isolated from the chassis and the AC power

supply. Opto-isolated input blanking control

and listen-only RS-232 interface lines are

provided for instrument control. Digital

noise is eliminated by shutting down the

microprocessor's oscillator except during

the short time required to alter the

instrument's configuration, either through a

front-panel pushbutton or through an RS-

232 command. Internal sealed lead-acid

batteries provide 15 hours of line-

coupled low-noise amplification of single-

ended and true differential input signals at

gains of 1 to 50,000. Two configurable R-C

filters are provided to selectively condition

signals in the frequency range from DC to 1

MHz. The user can choose high dynamic

reserve or low noise settings, and can invert

the output relative to the input. The SR560

normally operates with a fully floating

ground and can be viewed as an "in-line-

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INTRODUCTION AND SETUP

independent operation. Rear panel banana

Line Fuse

jacks provide access to the internal

regulated power supplies (or batteries) for

use as a bias source.

Verify that the correct line fuse is installed

before connecting the line cord to the unit.

For 100 V and 120 V, use a 1 Amp fuse and

for 220 V and 240 V, use a 1/2 Amp fuse.

PREPARATION FOR USE

Line Cord

**********CAUTION**********

This instrument may be damaged if

operated with the LINE VOLTAGE

SELECTOR card set for the wrong applied

AC input source voltage or if the wrong fuse

is installed.

The SR560 has a detachable, three-wire

power cord with a three-contact plug for

connection to both the power source and

protective ground.

The protective ground

connects to the accessible metal parts of

the instrument except for BNC shields.

To prevent electrical shock, always

use a power source outlet that has a

properly grounded protective-ground

contact.

Line Voltage

When the AC power cord is connected to

the unit and plugged into an AC outlet, the

unit automatically switches the amplifier

power source from internal battery operation

to line operation. The internal batteries are

charged as long as AC power is connected.

Ventilation

Always ensure adequate ventilation when

operating the SR560. The unit will generate

heat while charging dead batteries.

The SR560 can operate from a 100 V, 120

V, 220 V or 240 V nominal AC power source

having a line frequency of 50 or 60 Hz.

Before connecting the power cord to a

power source, verify that the LINE

VOLTAGE SELECTOR card, located in the

rear-panel fuse holder of the unit, is set so

that the correct AC input voltage value is

visible.

Power-Up

All instrument settings are stored in

nonvolatile memory (RAM backed-up) and

are retained when the power is turned off.

They are not affected by the removal of the

line cord. If the power-on self test passes,

the unit will return to the settings in effect

when the power was last turned off. If an

error is detected or if the backup battery is

exhausted, the default settings will be used.

Additionally, if the RESET key is held down

when the power is turned on, the instrument

settings will be set to the defaults shown

below:

Conversion from one AC input voltage to

another requires a change in the fuse

holder's LINE VOLTAGE SELECTOR card

position and a new fuse. Disconnect the

power cord, slide the fuse holder cover to

the left and rotate the fuse-pull lever to

remove the fuse. Remove the small printed

circuit board. Select the operating voltage

by orienting the printed circuit board. Press

the circuit board firmly into its slot, so the

desired voltage is visible. Rotate the fuse-

pull lever back into its normal position and

insert the correct fuse into the fuse holder.

Parameter

Setting

SOURCE

COUPLING

INVERT

Channel A

OFF

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INTRODUCTION AND SETUP

ROLLOFF

bypassed

Accessories Furnished

HIGH-PASS

LOW-PASS

GAIN MODE

0.03 Hz, +6 dB/oct

1 MHz, -6 dB/oct

High Dynamic

Reserve

- Power cable

- Operating Manual

GAIN

LISTEN

20, calibrated

Environmental Conditions

DEVICE ADDRESS

As per SW601

OPERATING

Temperature: 10°C to 40°C

Relative Humidity: <90% Non-condensing

Repackaging for Shipment

The original packing materials should be

saved for reshipment of the SR560. If the

original packing materials are not available,

wrap the instrument in polyethylene

sheeting or equivalent and place in a strong

box, cushioning it on all sides by at least

three inches of high-density foam or other

filler material.

NON-OPERATING

Temperature: -25°C to +65°C

Relative Humidity: <95% Non-condensing

Warning regarding battery

maintenance

Batteries used in this instrument are seal

lead acid batteries. With usage and time

these batteries can leak. Always use and

store this instrument in the feet-down

position. To prevent possible damage to the

circuitboard, it is recommended that the

batteries be periodically inspected for any

signs of leakage.

Use in Biomedical Applications

Under certain conditions, the SR560 may

prove to be unsafe for applications involving

human subjects. Incorrect grounding,

component failure, and excessive common-

mode input voltages are examples of

conditions in which the instrument may

expose the subject to large input currents.

Therefore, Stanford Research Systems

does not recommend the SR560 for such

applications.

Warning Regarding Use with

Photomultipliers

The front-end amplifier of this instrument is

easily damaged if a photomultiplier is used

improperly with the amplifier. When left

completely unterminated, a cable connected

to a PMT can charge to several hundred

volts in a relatively short time. If this cable

is connected to the inputs of the SR560, the

stored charge may damage the front-end

FETs. To avoid this problem, provide a

leakage path of about 100 kΩ to ground

inside the base of the PMT to prevent

charge accumulation.

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SPECIFICATIONS

SR560 LOW-NOISE PREAMPLIFIER SPECIFICATIONS CHART

Inputs

Single-ended or true differential

Impedance

Maximum Inputs

100 MΩ + 25 pF, DC-coupled

1 VDC before overload; 3 V peak to peak max AC coupled;

protected to 100 VDC

Maximum Output

Noise

10 Vpp

<4 nV/√Hz at 1 kHz

CMRR

>90 dB to 1 kHz, decreasing by 6 dB / octave (20 dB / decade)

above 1 kHz

Gain

1 to 50,000 in 1-2-5 sequence

vernier gain in 0.5% steps

Frequency Response

Gains up to 1000, small signal

±0.5 dB to 1 MHz

±0.3 dB to 300 kHz

-3 dB at 1 MHz, 1 Vpp output

Gain Stability

DC Drift

200 ppm /°C

5 µV/°C referred to input (DC coupled)

0.03 Hz to 1 MHz, 10% typical accuracy

0.01% typical

Filters

Distortion

Power

100, 120, 220, 240 VAC (50/60 Hz), 60 Watts Max

Internal Batteries: 3 x 12 V, 1.9 Ah sealed

lead-acid (rechargeable)

±12 VDC in / out through rear panel banana jacks.

Battery Life

15 hours nominal

250-1000 charge / discharge cycles

Charge Time

Mechanical

Dimensions

Warranty

4 hours to 80% of capacity

1/2 Rack-Mount width, 3 1/2" height, weight 15 lbs.

14-7/8" x 8-1/8" x 3-1/2"

1 year parts and labor on materials and workmanship

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SPECIFICATIONS

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OPERATION AND CONTROLS

Figure 2: SR560 Front Panel

FRONT PANEL OPERATING SUMMARY

The operation of the SR560 Low-Noise

Preamplifier has been designed to be as

simple as possible. The effect of each

keypress on the front panel is reflected in

the change of a nearby LED. The front

panel LED’s will remain lighted at all times

unless dip switch SW601 (accessible

through the bottom cover of the unit)

positions 3 and 4 are placed in the "off"

position. All front panel functions can be

controlled through the rear-panel RS-232

interface.

lighted. As the batteries near exhaustion,

this indicator will change from green to red,

indicating that the unit should be connected

to AC power to charge the batteries.

When connected to an AC power source,

amplifier power is derived from regulated

line power, and the internal batteries are

automatically charged. When operating on

AC power, the front panel "LINE" indicator is

on to indicate the source of amplifier power.

Charging status is indicated on the rear

panel by the "CHARGE" and "MAINTAIN"

LED indicators.

Power

Source

The SR560 is turned on by depressing the

POWER switch. When disconnected from

AC power, the unit will operate for

There are two input connectors located in

the SOURCE section of the front panel.

The pushbutton located between them

selects either single-ended (A or B) or

differential (A-B) inputs.

approximately 15 hours on internal sealed

lead-acid batteries. Up to 200 mA of

unregulated battery power is available at the

rear panel banana jacks as long as the

power switch is in the ON position. Battery

life will be reduced when the unit is

The A and B inputs are voltage inputs with

providing external power through the rear

panel jacks. When operating on batteries,

the front panel "BATT" indicator will be

100 MΩ, 25 pF input impedance.

connector shields are completely isolated

from chassis ground, but can be made

Their

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OPERATION AND CONTROLS

common with chassis ground by connecting

MHz. The filters in the FILTER CUTOFFS

section can be configured in the following

six ways:

the "AMP GROUND" and "CHASSIS

GROUND" banana jacks on the rear panel

of the SR560. When connected to AC

power, the chassis of the unit is always

connected to the grounding conductor of the

AC power cord. The inputs are protected to

100 VDC but the DC input should never

exceed 10 Vp. The maximum DC input

before overload is 1 V peak.

i. high-pass filter at +12 dB / octave

ii. high-pass filter at +6 dB / octave

iii. high-pass filter at +6 dB / octave,

and low-pass filter at -6 dB /

octave (band-pass)

iv. low-pass filter at -6 dB / octave

v. low-pass filter at -12 dB / octave

vi. no filters in the signal path

The COUPLING pushbutton selects the

method of connecting the A and B inputs to

the amplifier. The inputs can be AC (0.03

Hz - 3 dB) or DC-coupled, or the inputs to

the amplifier can be internally grounded with

the A and B input BNC’s left floating.This

feature makes for simple offset nulling,

particularly useful when operating the

amplifier DC-coupled at high gains. Please

refer to CALIBRATION AND REPAIR --

OFFSET ADJUSTMENT for information on

the offset nulling procedure.

The filter settings are controlled by the

ROLLOFF, HIGH-PASS and LOW-PASS

pushbuttons. Each time the ROLLOFF

pushbutton is pressed the instrument

configures the two R-C filters to conform to

the progression shown above. The four

ROLLOFF LED’s give a visual indication of

the current filter configuration. For the

HIGH-PASS filter the left pushbutton serves

to decrease its cutoff frequency. The two

pushbuttons for the LOW-PASS filter

function in an analogous manner.

NOTE: When the coupling is set to AC, a

0.03 Hz cutoff high-pass filter is always

engaged. All high-pass filter modes can still

be selected while AC-coupled, but the 0.03

Hz filter will always be in, even if the filters

are set to DC. Because one of the two filter

sections is always used as a high pass

when AC coupling is selected, low-pass

filters are only available with a 6 dB / octave

rolloff.

When the FILTER CUTOFFS section is

configured solely as high-pass or low-pass

(i, ii, iv and v ), the cutoff frequency is

illuminated by one of sixteen LED’s in the

range from 0.03 Hz to 1 MHz, and the slope

of the rolloff is shown by one of the four

ROLLOFF LED’s. When the filter section is

configured as band-pass (iii), the cutoff

frequencies are illuminated by two LED’s.

The frequency setting on the left marks the

cutoff for the high-pass filter, and the setting

on the right is the cutoff for the low-pass

filter. The two 6 dB / oct ROLLOFF LED’s

are also illuminated. In this case the two

cutoffs can be set to the same frequency to

provide a narrow bandpass. When both

filters are removed from the signal path (vi)

all rolloff and cutoff frequency LED’s are

extinguished from the FILTER CUTOFFS

section and the DC LED is on.

The INVERT pushbutton allows the user to

invert the output of the instrument with

respect to the input when operating with

single-ended or differential inputs. The

INVERT LED displays the output sense

relative to the input for all SOURCE

settings.

Filters

The SR560 contains two identical 1st-order

R-C filters whose cutoff frequencies and

topology (high-pass or low-pass) are

controlled from the front panel. The

NOTE: High pass filters are not available

for the four highest frequency settings. See

the note under Source: Coupling for

maximum bandwidth of the instrument is 1

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OPERATION AND CONTROLS

information on using filters with the amplifier

in AC coupled mode.

Output

The outputs of the instrument are located

within the OUTPUT section of the front

panel. Two insulated BNCs are provided: a

600Ω output and a 50Ω output. The

amplifier normally drives high impedance

loads and the instrument's gain is calibrated

for high impedance loads. When driving a

600Ω load via the 600Ω output (or a

50Ω load via the 50Ω output) the gain of the

amplifier is reduced by two. The shields of

all the front-panel BNC’s are connected

together and form the amplifier's floating

ground.

Gain Mode

The allocation of gain throughout the

instrument is set using the GAIN MODE

pushbutton The Gain Mode is displayed by

two indicator LED’s: HIGH DYNAMIC

RESERVE and LOW NOISE.For a given

gain setting, a HIGH DYNAMIC RESERVE

allocates the SR560's gain toward the

output stages after the filters. This prevents

signals, which are attenuated by the filters

from overloading the amplifier. The LOW

NOISE setting allocates gain toward the

front-end in order to quickly "lift" low-level

(nV range) signals above the instrument's

noise floor.

Reset

The OVLD LED indicates a signal overload.

This condition can occur when a signal is

too large or the dynamic reserve is too low.

Reducing the gain, reducing the input signal

and/or switching to the HIGH DYNAMIC

RESERVE setting should remedy this

condition. If an overload occurs with filter

settings of long time constants, the RESET

pushbutton will speed the SR560's recovery

from overload.

Gain

The instrument's gain is increased or

decreased using the GAIN pushbuttons.

Gain settings from 1 to 50,000 are available

and are displayed as the product of a factor

1, 2 or 5 and a multiplier (none (i.e. 1), 10,

100, 1,000 or 10,000). In addition to these

fifteen fixed gain settings, the user may

specify arbitrary gains through the UNCAL

feature. To set an uncalibrated or arbitrary

gain the user must press both Gain buttons

simultaneously, lighting the UNCAL LED. In

this mode by pressing the Gain Up or Gain

Down pushbuttons, the user may reduce the

calibrated gain in roughly 1% increments

from 100% down to 0% of the selected gain.

In contrast to other front-panel functions,

when in UNCAL the instrument's key-repeat

rate will start slowly and increase to a limit

as long as either Gain button is depressed.

Simultaneously pressing both Gain buttons

once again will restore the unit to the

Status

The ACT LED indicates communications

activity over the SR560's optoisolated RS-

232 port. Please refer to Appendix A:

Remote Programming for further details on

programming the instrument via RS-232.

The BLANK LED indicates the optoisolated

BLANKING input (on the rear panel of the

SR560) is active. The SR560 responds to a

blanking input by internally grounding the

amplifier signal path after the front end and

before the first filter stage.

previously calibrated gain setting, and turn

off the UNCAL LED.

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OPERATION AND CONTROLS

Figure 3: SR560 Rear Panel

REAR PANEL OPERATING SUMMARY

The SR560 rear panel is pictured in Figure

3. Various interface and power connectors

are provided, along with fuses and charger

status LEDs.

ground is connected to the AC line ground

conductor.

Battery Charger

AC Power Input

The two 3 A slow-blow fuses protect the

battery supply and charging circuitry. If

these fuses are blown, battery power will be

unavailable, and charging of the batteries

will not be possible.

The power entry module contains the

receptacle for the AC line cord and fuse.

The line fuse should be a 1 A slow-blow for

100/120 VAC operation, or a 1/2 A slow-

blow for 220/240 VAC operation.

When both the positive and negative supply

batteries are dead, the red "CHARGE" LED

will be on brightly, and the batteries will be

charging at a fast rate. When the batteries

approach a fully charged condition, the

charging current will be reduced to complete

the charge and maintain the batteries.

Because the batteries charge at different

rates, the indicators on the rear panel can

reflect the charge status of the positive and

negative batteries independently. When

one set of batteries switches to the

"MAINTAIN" mode, the red "CHARGE" LED

will be reduced to half brightness, and the

yellow "MAINTAIN" LED will turn on at half

brightness. When both batteries switch to

"MAINTAIN", the red "CHARGE" LED will

Amplifier Power Output

The -12 V, +12 V, and AMP GROUND

banana jacks provide external DC power up

to 200 mA for use as a bias source

referenced to the amplifier's floating power

supplies.

The CHASSIS GROUND banana jack is

provided to allow the amplifier's ground to

be referenced to the chassis. If the unit is

connected to an AC power source via a

three prong grounding plug, the chassis

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OPERATION AND CONTROLS

turn off and the yellow "MAINTAIN" LED will

be on full brightness.

the batteries from the amplifier if the unit is

operated for too long in the low battery

condition. This protects the batteries from

permanent damage, which could occur if

they were to remain connected to a load

while dead.

Blanking Input

The blanking input accepts a TTL-level

signal and grounds the amplifier signal path

after the front end for as long as the input is

held high. The response time of the

blanking input is typically "on" 5 µs after the

rising edge and "off" 10 µs after the falling

edge.

The internal battery charging circuitry of the

SR560 will automatically charge dead

batteries at a quick rate until they are

approximately 80% charged. The charge

rate is then lowered to a level that is safe for

maintaining the batteries. During AC

operation, the batteries will be in this

"maintain" charge condition indefinitely, and

will suffer no degradation from prolonged

charging. The sealed lead-acid batteries

used in the SR560 differ in this respect from

nickel-cadmium batteries, which do suffer

shortened lifetimes due to overcharging.

The sealed lead-acid batteries will provide

the longest service life if they are not

allowed to discharge too deeply and if they

are charged immediately after use.

RS-232 Interface

The RS-232 interface connector allows

listen-only communication with the SR560

at 9600 baud, DCE. Communication

parameters should be set to 8 bits, no

parity, 2 stop bits. Data sent must be

delimited by <CR> <LF>. All front panel

functions excluding power and blanking, are

available over the RS-232 interface. For

more information on programming and

commands, see Appendix A: Remote

Programming.

Battery Care

WARNING: As with all rechargeable

batteries, for safety reasons the chemical

recombination processes within the cells

require that the batteries be allowed to vent

non-corrosive gases to the atmosphere.

Always use the batteries in an area with

adequate ventilation.

BATTERY CARE AND USAGE

The SR560 can be powered from either an

AC power source or from three 12 V, 1.9

Amp-hour maintenance-free sealed lead-

acid rechargeable batteries. Integral to the

SR560 is an automatic battery charger,

along with battery protection and charge

indication circuitry.

As with all instruments powered by

rechargeable batteries, the user must take

some precautions to ensure long battery

life. Understanding and following the

precautions outlined below will result in a

long operating life for the batteries in the

SR560.

Recharging

During battery operation, the front panel

BATT LED will change from green to red to

indicate that the batteries are low and

require charging. For the longest battery

life, the batteries should be immediately

charged by plugging the unit into AC power

whenever the BATT indicator lights red.

Internal protection circuitry will disconnect

The SR560's internal lead-acid batteries will

have a variable service life directly affected

by THE NUMBER OF DISCHARGE

CYCLES, DEPTH OF DISCHARGE AND

AMBIENT TEMPERATURE. The user

should follow these simple guidelines below

to ensure longest battery life.

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OPERATION AND CONTROLS

• AVOID DEEP DISCHARGE

• KEEP THE BATTERIES COOL

Recharge the batteries after each use. The

two-step fast-charge / trickle-charge

operation of the SR560 allows the charger

to be left on indefinitely. ALWAYS recharge

the batteries immediately after the BATT

indicator LED on the SR560 turns red.

Built-in protection circuitry in the unit

removes the batteries from the load once a

dead-battery condition is detected.

When not in use, the SR560 should be

stored in a cool, dry place with the batteries

fully charged. This reduces the self-

discharge of the batteries and ensures that

the unit will be ready for use when called

upon. A SR560 in storage should be

"topped off" every three months with an

overnight charge to maintain its batteries in

peak condition.

Avoiding deep discharge will provide the

longest battery life - upwards of 1,000

charge / discharge cycles.

Warning regarding battery maintenance

• AVOID TEMPERATURE EXTREMES

Batteries used in this instrument are seal

lead acid batteries. With usage and time

these batteries can leak. Always use and

store this instrument in the feet-down

position. To prevent possible damage to the

circuitboard, it is recommended that the

batteries be periodically inspected for any

signs of leakage.

When using battery power, operate the

SR560 at or near room temperature.

Operating at lower temperatures will reduce

the capacity of the batteries. As well, more

time will be required to recharge the

batteries to their rated capacity. Higher

temperatures accelerate the rate of

reactions within the cell, reducing cell life.

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CIRCUIT DESCRIPTION

select either the output of the second stage

amplifier or ground as the input to the next

stage, the first filter section.

DIFFERENTIAL LOW-NOISE

FRONT END

Two high-impedance inputs A and B allow

the instrument to operate in either single-

ended or true differential modes. Relays

K103 and K104 allow the inputs A and B to

be individually grounded, while K101 selects

AC or DC coupling. Inversion of the inputs

is provided by relay K105. The input

capacitances and R101 and R102 establish

the front end's input impedance at 25 pF

and 100 MΩ.

CONFIGURABLE FILTERS AND

GAIN

The two filter stages in the SR560 each

consist of 16 R-C filters which can be

configured as either high pass or low pass

by a relay. In the following description, part

references in parentheses refer to filter two.

Relay K201, (K301) selects either the high-

pass or low-pass configuration for all of the

sixteen filters. The output of one R-C

section is selected by multiplexer U202 or

U203, (U301 or U302) and passed on to

non-inverting buffer U202, (U303).

U106 is an NPD5564 low-noise matched

FET pair, which, along with U102 and U103

form the first differential amplifier stage.

U102 compares the currents in the drain

loads of U106, and U103 maintains the sum

of those currents at a fixed level by varying

the total current in both FETs. C109

provides open-loop compensation for U102,

and front-end gain is nominally established

by the sum of R118 and R112 over the sum

of R114 and R128. K102 is a gain switching

relay which selects a front end gain of 2 or

10. In the gain of 2 position, gain to the

next stage becomes 1 when R116 divides

with the input attenuator to the next stage.

For a gain of 10, relay K102 shorts the top

of R115 and R128 together, essentially

eliminating them from the gain loop. P103

allows adjustment of front-end offset, and

P104 allows for offset compensation when

in the low gain configuration. P102 allows

adjustment of the front-end common-mode

rejection ratio, along with P101, which

adjusts the CMRR in the low gain

Approximately 80 pF input capacitance of

the multiplexers is included in the

calculation of the R-C time constants of the

filters. The four highest frequency stages

are not available as high-pass filters

because of unacceptable attenuation of the

signal that occurs when the filter

capacitance forms a divider with the input

capacitance of the multiplexers.

DG444 U205D, (U401A) is used to bypass

the filter sections entirely and U101D,

(U304D) is used to "reset" the filter stages

by discharging them through R228, (R329).

U201, (U305) is the third, (fourth) gain stage

with a fixed gain of 5. The input attenuator

U205, (U304) allows setting the gain of

these stages to 1, 2, or 5 under computer

control.

configuration.

In the second gain stage, U105 is

configured with a fixed gain of 10. By

switching the input attenuation of this stage

with DG444 U101, the overall gain of this

stage can be computer selected as 2, 5, or

10. C111 provides high frequency

compensation for U105. The output of this

stage passes through all three sections of

U104, a CMOS multiplexer that serves as

the blanking control. The three parallel

switches provide a low "on" resistance to

OUTPUT STAGES

The fifth gain stage consists of op-amp

U402 which is configured as a non-inverting

amplifier with a gain of 5. U401 is a DG444

that again serves to switch the input

attenuation of this stage for overall gains of

1, 2, or 5. Additionally, output offset

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CIRCUIT DESCRIPTION

adjustment is provided by this stage.

panel key is pressed and instrument

settings are to be changed, or while there is

activity on the RS-232 port.

U405B, half of an AD7528 dual 8-bit DAC is

used to provide a ±5 volt offset voltage at

the non-inverting input of U402. The front

panel offset control also sums at this

junction, and provides an offset voltage of

±5 V that is buffered by U407D.

The SR560 uses a 16 K x 8 CMOS

EPROM, (U504) containing system

firmware and calibration bytes, along with a

2 K x 8 CMOS RAM, (U505) which is

battery backed-up at all times to retain

instrument settings.

Following amplifier U402 is the other half of

the 8-bit DAC U405A, which along with op-

amp U404 forms a digital gain vernier. This

vernier is used in calibration to compensate

for gain variances that occur with

configuration changes such as input

coupling and filter settings. This DAC also

provides the front panel "uncal" gain vernier

function.

U507 generates port strobes for system IO,

and U510 provides a buffered data bus.

The buffered data bus is active only during

IO instructions to keep digital noise in the

amplifier to a minimum while the processor

is running.

The sixth and final gain stage consists of

U403 and output buffer U406, configured for

a gain of 5 and with input attenuator U409

to select overall gains of 1, 2, or 5. The

LM6321, (U406) provides the output drive

capability for both the 600Ω and 50Ω

outputs.

U601 through U606 are control latches

providing the 48 DC control lines that

configure all of the instrument's hardware.

U607 is an input buffer and takes data from

the front panel and RS-232, as well as

providing a processor input indicating line

operation and address from SW601 for

ganged RS-232 operation. SW601

additionally controls power to the front panel

LED’s through positions 3 and 4.

OVERLOAD DETECTION

The overload detector constantly monitors

the front-end output, filter 1 output, U402

(after the second filter) output, and final

stage output for excessive signal levels.

Comparator U408 compares both positive

and negative signal excursions against a 5

volt reference and lights the front panel

overload indicator if any levels are

excessive.

BATTERY CHARGER

AND PRE-REGULATORS

The 17 volt AC line transformer provides

unregulated power for both amplifier

operation and battery charging. Diode

bridge D706 and filter capacitors C706 and

C707 generate unregulated DC that is pre-

regulated to ±12 VDC by U706 and U707 to

take the place of the batteries when the

instrument is operating on AC line power.

Relay U705 switches the amplifier from

battery to pre-regulated AC whenever the

AC line cord is plugged in.

MICROPROCESSOR

The system processor U503 is a CMOS Z80

processor running at 4 MHz. The system

clock consists of Schmitt trigger U506A and

an R-C network. The oscillator is designed

so that latch U508A can shut down the

clock oscillator completely, thereby

disabling all digital circuits in the amplifier so

that no digital noise will be present. The

processor and clock only run when a front

Diode bridge D710 and C709 and C710

provide unregulated DC to charge the

batteries. U701 and U702 operates as "AC"

regulators, limiting peak battery charging

voltage. As there are two positive batteries

and one negative battery, U701 is a LM350

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CIRCUIT DESCRIPTION

regulator that provides twice the current of

the LM317 negative battery regulator.

POWER REGULATORS

The +5 V and +10 V supplies are produced

with three-terminal regulators U801 and

U802, respectively. The -10 V supply is

constructed of op-amp U803 and Q801, a

N-channel MOSFET as the pass element.

The +10 V supply serves as the reference

for the -10 V supply through divider R807

and R806.

Charging is controlled by changing the set

voltage of the regulators based on battery

charge status. Flip-flop U703 determines

whether the charge regulators will be set to

15.5 volts for a quick charge or 13.8 volts

for a trickle or "maintain" charge by

grounding the bottom of P701 and P702.

C712 and R704 insure that the charger

always powers up in the "quick" charge

mode. P701 and P702 are provided to

adjust the open circuit trickle charge voltage

to 13.8 volts. D701 and D703 are blocking

diodes for the charging circuits while not

charging, and D707 and D708 are clamps to

guard against battery polarity reversal.

The power output banana jacks on the rear

panel (J801 and J803) are connected to the

pre-regulated voltages after the power

switch and before the regulators. This

output can provide up to 200 mA of power

for use as an external bias source, etc.

Under some conditions, these jacks may be

used to supply the unit with external DC

power.

Comparators U708 and U709 are LP365

micropower comparators that monitor the

battery voltage. A resistive divider chain

sets the four trip points for each comparator.

D709 provides a stable 2.5 volt reference

against which levels are compared. For

each battery, three level indications are

provided, and are decoded by multiplexer

U704. The "trip" level is 14.5 volts. The trip

outputs control the state of U703 and switch

the battery charge voltage settings. The

"low" level is 11.3 volts and activates the

front panel low battery indicator. R730

provides some level hysteresis for the low

battery indication to prevent oscillation

around the trip point. The "dead" level is

10.7 volts and is used to disconnect the

load from the batteries before they are

damaged by an excessively deep

U506D and U506B generate the TTL level

input to the processor to indicate when the

unit is operating on the AC line.

Capacitors C801 through C821 are logic

supply bypass capacitors distributed

throughout the printed circuit board.

REAR PANEL INTERFACES

Two optically isolated rear panel interfaces

are provided on the SR560. The blanking

input accepts a TTL-level signal and

grounds the amplifier signal path after the

front end for as long as the input is held

high. The response time of the blanking

input is typically "on" 5 µs after the rising

edge and "off" 10 µs after the falling edge.

The RS-232 interface allows calibration and

control of the instrument at 9600 baud.

Data in and out on the connector are tied

together, echoing data back to the sender.

Hardware handshaking lines CTS, DSR,

and CD are tied to DTR. Refer to

discharge. Q701 and Q703 are power

MOSFET switches used to disconnect

battery power from the amplifier. Dead level

hysteresis is provided by R724. R731 and

D711 provide un-interrupted battery power

to the system RAM so that stored

instrument settings are retained when the

power is switched off.

Appendix A-1 for information on remote

programming of the SR560.

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CIRCUIT DESCRIPTION

BATTERIES AND P.E.M.

FRONT PANEL

The batteries used in the SR560 are of

sealed lead-acid construction. There are

three 12 V, 1.9 amp-hour batteries, two of

which serve as the positive power supply,

and one of which serves as the negative

power supply. Powering the SR560 alone,

battery life should be greater than 20 hours.

The batteries should last for more than 1000

charge / discharge cycles, provided the

guidelines under the Usage section are

followed. Two 3A, fast blow fuses on the

rear panel protect the battery supplies and

amplifier against excessive currents.

The front panel contains the keypad

pushbuttons, LED indicators and serial shift

registers. The front panel pushbuttons are

decoded in a 3 x 4 matrix fashion. The front

panel LEDs are controlled by shift registers

U1 through U5, which allow the 5 eight-bit

control bytes to be serially shifted-in one bit

at a time. The red overload LED is

controlled directly from the output of the

overload comparator.

The battery LED is a dual-color LED that is

green when the unit is operating on battery

power, and turns red when the low_batt

signal is asserted.

The power entry module (P.E.M.) contains

the AC line fuse, RFI filter, and voltage

selection card. To change the operating

voltage of the unit, the voltage selector

printed circuit card must be pulled out and

reinserted into the P.E.M. with the desired

operating voltage visible.

The front panel output offset pot P1 is also

mounted on the front panel printed circuit

board.

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CALIBRATION AND REPAIR

•

Apply 1 kHz 1 Vpp sine to both the A

and B inputs.

OFFSET ADJUSTMENT

The SR560's front-panel offset adjustment

provides an easy way for the user to null the

amplifier's DC offset. Use the COUPLING

pushbutton to light the GND LED. Now,

regardless of the SOURCE setting, the input

to the amplifier is grounded internally.

Insert a small screwdriver through the front-

panel OFFSET hole and adjust the offset

potentiometer until the DC offset of the

amplifier (e.g. as viewed on a DVM) is zero.

Finally, return to the desired coupling.

•

Couple = DC, source = A - B: adjust

P102 to null sine wave output.

Now adjust the offset and CMRR for the

case where the front-end gain is x2. View

the amplifier output on a scope and perform

the following adjustments:

•

Couple = GND (remove signal from

A and B inputs), Gain = 5 k, HIGH

DR: adjust P104 to null DC and

output.

CALIBRATION

•

Apply 1 kHz 1 Vpp sine to both the A

and B inputs.

There are four pots, which are used to

calibrate the instrument. The pots adjust

the front-end CMRR (Common Mode

Rejection Ratio) and offset. These pots are

located close to the front of the instrument,

and may be accessed by removing the

bottom cover.

Couple = DC, source = A - B: adjust

P101 to null sine wave output.

NOTE: In the above procedures, the gain of

the front-end (x10 or x2) is determined by

the selection of LOW NOISE or HIGH

DYNAMIC RESERVE.

These pots should be adjusted to optimize

the CMRR or null the offset when the front-

end FET is replaced. Two of the pots adjust

the CMRR and offset when the front-end

gain is x10, and two adjust the CMRR and

offset when the front-end gain is x2. The

x10 gain pots must be set first, followed by

the x2 gain pots.

FRONT END REPLACEMENT

The most commonly damaged component

is the front-end FET (U106, National

Semiconductor Corp. P/N NPD5564). It is

located in an 8-pin DIP socket behind the

relays near the input BNCs. If the

instrument exhibits a constant overload,

excessive drift or noise, or large input bias

currents, it is likely that this component has

been damaged.

First, the front panel offset pot must be set

to zero:

•

Adjust front panel Offset pot to read

0 VDC on pin 14, U407.

When replacing the FET, be certain that all

eight pins are inserted into the socket, and

observe the orientation of pin #1. After

replacement adjust the CMRR and offset

per the calibration procedure. More severely

damaged front-ends may require

Next adjust the offset and CMRR for the

case where the front-end gain is x10. View

the amplifier output on a scope and perform

the following adjustments:

•

Couple = GND, Gain = 5 k, LOW

NOISE: adjust P103 to null DC and

output.

replacement of op-amp, U102.

Now use a function generator as the source

of a common mode signal:

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CALIBRATION AND REPAIR

11. Set the coupling to "GND" and gain =

SR560 OFFSET ADJUSTMENT

PROCEDURE

50,000

12. Readjust P103 for zero volts on the

oscilloscope.

13. Set SR560 gain = 50 and coupling to

"DC".

14. Set the oscilloscope to AC coupling.

15. Using the digital volt meter, measure the

voltage from pin 6 of U105 to ground

(output BNC shield).

16. Adjust P104 for zero volts on the meter.

17. Adjust P101 to null the square wave on

the oscilloscope.

Required equipment:

Digital volt meter

Oscilloscope

4 BNC cables

1 BNC tee

Function generator

Small slotted screwdriver

Phillips screwdriver

Remove the bottom cover of SR560 to

expose the component side of pc board.

You might have to readjust P104 and P101

several times. The end result should be

zero volts on pin 6 of U105, with the

smallest amplitude square wave that you

can achieve on the oscilloscope.

1. Turn off the SR560. Hold down the

"Reset" button, and turn the unit back on

(this sets the unit back to the default

settings).

2. Using a Digital Volt Meter, adjust the front

panel offset pot (located between "A''

and "B" input BNC's on front panel) to

read zero volts between pin 14 of U407

and ground (output BNC shield). Do not

use the chassis as ground.

BATTERY REPLACEMENT

After three to five years or about 1000

charge/discharge cycles, the sealed lead-

acid batteries degrade. When the battery

operation time shortens, or if the unit stays

very warm for more than a day after it is

plugged into the line, the batteries may

require replacement.

There are 4 potentiometers located on the

bottom right side of the pc board

(Viewed from the component side, with front

panel facing forward). These are:

The three batteries are a standard size

which are available from several different

distributors. All are 12 VDC with a charge

capacity of about 2.0 Amp-hours, and

measure 7.02" X 1.33" X 2.38". Two of the

batteries are wired in parallel to provide the

high current required for the positive supply.

When replacing the batteries, take care to

observe the polarities!

P101 = low gain CMRR adjust

P102 = high gain CMRR adjust

P103 = high gain offset adjust

P104 = low gain offset adjust

3. Set the SR560 coupling to "GND", and

the gain = 50,000.

4. Connect the oscilloscope to the 50 Ohm

output on the SR560.

5. Adjust P103 for zero volts on the 50 ohm

output, using the oscilloscope.

6. Set the SR560 gain = 1000 and Source

to "A-B''.

FUSE REPLACEMENT

7. Set the function generator to square

wave, Freq = 1 KHz, amplitude =

500mV pp.

8. Using a BNC tee, and 3 BNC cables, put

the square wave into channels A and B.

9. Set the SR560 coupling to "DC".

10. Adjust P102 to null the square wave on

the oscilloscope.

There are three fuses on the back panel of

the instrument. The fuse located inside the

power entry module will blow if the unit

draws excessive line current. Replace this

fuse with the value indicated for your line

voltage.

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CALIBRATION AND REPAIR

The other two fuses are in-line with the

amplifier's "1/f" noise is large relative to the

thermal noise of the source.

batteries. These fuses will blow if the rear

panel ±12 VDC supplies are shorted, or if

the unit sources or draws excessive current

to or from the batteries.

The NF gets worse for large source

impedances and high frequencies because

the signal is attenuated (hence the gain

reduced) by the shunting capacitance of the

input.

NOISE CONTOURS

Under no circumstances will adding source

resistance reduce the amplifier's output

noise! While this does improve the NF, it

does so by making the source so noisy that

the amplifier is quiet in comparison.

The noise contours (shown upper right) plot

the noise figure as a function of source

impedance and frequency. Noise Figure

(NF) is defined as:

•

NF = 20 log (Output noise / (Gain X

Source Thermal Noise)

A low noise figure means that the output

noise is dominated by the thermal

(Johnson) noise of the source. A high noise

figure indicates that the amplifier's output

noise is dominated by the amplifier's own

noise, which is much larger than the thermal

noise of the source.

The NF gets worse for low source

resistances because the source's thermal

noise gets very small, while the amplifier's

input voltage noise stays relatively constant.

The NF gets worse for low frequencies and

low source resistances because the

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CALIBRATION AND REPAIR

configuration (gain, filters and dynamic

INPUT VOLTAGE NOISE

reserve setting). The figure below shows

the dynamic reserve (and maximum input

signal without overload) for a SR560 set to

a gain of 1000, the high pass filter set to 1

kHz and the low pass filter set to 10 kHz (for

a bandpass from 1 kHz to 10 kHz). The

dynamic reserve characteristic is shown for

both "High Dynamic Reserve" and "Low

Noise" gain modes.

The amplifier's input voltage noise

approximates that of a 1000Ω resistor

(about 4 nV/√Hz). For source impedances

below 1000Ω, the output noise will be

dominated by the amplifier's input voltage

noise. A typical amplifier has an input

voltage noise vs. frequency as shown in the

figure below. Notice that the voltage noise

rises at lower frequencies (“1/f" noise).

There are several features to note. In the

bandpass region between 1 and 10 kHz the

dynamic reserve is 0 dB. The dynamic

reserve is 3 dB at the filter frequencies of 1

and 10 kHz. The dynamic reserve rises by

6 dB/oct (or 20 dB per decade) as the signal

moves away from the pole frequency, since

each RC filter attenuates the signal. If a

faster roll-off for interfering signals were

required, a 12 dB/octave HP or LP filter

could be used.

The HIGH DR characteristic offers 16 dB

more DR at low frequencies and 26 dB

more at high frequencies. The high

frequency DR is limited only by the

maximum 3 Vpp limit of the input stage.

The maximum DR in the low noise mode is

36 dB. Since there is no gain between the

HP and LP filters in the Low Noise gain

mode, the DR is the same at very high

frequencies and very low frequencies.

DYNAMIC RESERVE

The dynamic reserve of the amplifier is a

measure of how large a signal can be

present at the input to the amplifier without

causing an overload condition.

The input reference voltage noise for the

High DR gain mode is about 10 nV/√Hz,

compared to 4 nV/√Hz in the Low Noise

gain mode. The table (middle of next page)

summarizes the input referenced noise and

maximum dynamic reserve for all gains.

The definition of dynamic reserve is:

•

DR (dB) = 20 log (Vin(f) w/o

overload / Vin for full scale)

A full-scale output voltage is 10 Vpp.

Signals at the output (or at any stage) which

exceed 10 Vpp cause an overload. The

dynamic reserve is greater than 0 dB only

when the filters are used to remove

unwanted signals.

The dynamic reserve is a function of

frequency and depends on the amplifier

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CALIBRATION AND REPAIR

Gain

Input Noise Maximum

(nV/√ Hz )

DR (dB 0)

Gain

Input Noise Maximum

(nV/√ Hz )

DR (dB 0)

2000, LN

2000, HDR

5000, LN

5000, MDR

10, LN

10, HDR

10000

20000

50000

20, LN

20, HDR

50, LN

50, HDR

100, LN

100, HDR

200, LN

200, HDR

500, LN

500, HDR

1000, LN

1000, HDR

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CALIBRATION AND REPAIR

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APPENDIX A

1 = 6 dB low pass,

2 = 12 dB low pass,

3 = 6 dB high pass,

4 = 12 dB highpass,

5 = bandpass

REMOTE PROGRAMMING

Introduction

The SR560 is equipped with a standard DB-

25 RS-232C connector on the rear panel for

remote control of all instrument functions.

The interface is configured as listen-only,

9600 baud DCE, 8-bit, no parity, 2 stop bits,

and is optically isolated to prevent any noise

or grounding problems.

GAIN i

HFRQi

Sets the gain.

i = 0 – 14 = 1, 2, 5, … 50 k gain

Sets highpass filter frequency.

I = 0 – 11 sets frequency = 0.03

Hz to 10 kHz

Up to four SR560 amplifiers can be

connected in parallel to the same RS-232

interface. Units sharing the same interface

must have a unique address as set on dip

switch SW601, accessible through the

bottom cover of the unit. To set an

instrument to one of the four available

addresses, adjust positions one and two of

dip switch SW601 as follows:

INVT i

Sets the signal invert sense.

i = 0 = non-inverted,

1 = inverted

LALL

Listen all. Makes all attached

SR560’s listeners.

LISN i

Listen command. Makes

SR560 with address i (0,1,2,3)

a listener.

SW601

Pos. 2

OFF

Address

of unit

UNIT 0

UNIT 1

UNIT 2

UNIT 3

Pos.1

OFF

LFRQ i Sets lowpass filter frequency.

i = 0 – 15 sets frequency

= 0.03 Hz to 1 MHz

ROLD

Resets overload for ½ second.

Commands

SRCE i Sets the input source.

i = 0 = A, 1 = A-B, 2 = B

The following commands are obeyed by all

SR560’s that are addressed to listen. The

LALL, LISN, and UNLS commands are

always obeyed and control the address

status of the SR560. Commands must end

with a carriage return and line feed <CR>

<LF>.

UCAL i Sets the vernier gain status.

i = 0 = cal’d gain,

1 = vernier gain

UCGN i Sets the vernier gain to i %.

i = 0 to 100

BLINK i Operates amplifier blanking.

i = 0 = not blanked, 1 = blanked

UNLS

*RST

Unlisten. Unaddresses all

attached SR560’s.

CPLGi

Sets input coupling.

Reset. Recalls default settings.

I = 0 = ground, 1 = DC, 2 = AC

DYNR i Sets dynamic reserve.

i = 0 = low noise, 1 = high DR,

2 = calibration gains (defaults)

FLTM i Sets filter mode.

i = 0 = bypass,

A - 1

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APPENDIX A

A - 2

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APPENDIX B

for carbon, R is the resistance, I the current,

NOISE SOURCES AND CURES

the bandwidth of our detector, and f is the

frequency to which the detector is tuned.

For a carbon resistor carrying 10 mA with

R = 1 k, ∆f = f = 1 Hz, we have:

Noise, random and uncorrelated fluctuations

of electronic signals, finds its way into

experiments in a variety of ways. Good

laboratory practice can reduce noise

sources to a manageable level, and the

lock-in technique can be used to recover

signals, which may still be buried in noise.

V_noise= 3µVrms

Others

Other noise sources include flicker noise

found in vacuum tubes, and generation and

recombination noise found in

Intrinsic Noise Sources

Johnson Noise

semiconductors.

Arising from fluctuations of electron density

in a resistor at finite temperature, these

fluctuations give rise to a mean square

noise voltage,

All of these noise sources are incoherent.

Thus, the total noise is the square root of

the sum of the squares of all the incoherent

noise sources.

V²= ∫4kT Re [Z(f)]df = 4 kTR∆f

Non-Essential Noise Sources

where k = Boltzmann’s constant,

1.38 x 10^–23J/°K; T is the absolute

temperature in Kelvin; the real part of the

impedance, Re[z(f)] is the resistance R; and

we are looking at the noise source with a

detector, or AC voltmeter, with a bandwidth

of ∆f in Hz. For a 1 MΩ resistor:

In addition to the “intrinsic” noise sources

listed above there are a variety of “non-

essential” noise sources, (i.e. those noise

sources which can be minimized with good

laboratory practice). It is worthwhile to look

at what might be a typical noise spectrum

encountered in the laboratory environment:

(V²) ^1/2= 0.13µV/√Hz

To obtain the rms noise voltage that you

would see across this 1MΩ resistor, we

multiply 0.3 µV/√Hz by the square root of

the detector bandwidth. If, for example, we

were looking at all frequencies between DC

and 1 MHz, we would expect to see a rms

Johnson noise of:

(V²) ^1/2= 0.13µV/√Hz * (10⁶Hz) ^1/2= 130 µV

‘1/f Noise’

Arising from resistance fluctuations in a

current carrying resistor, the mean squared

noise voltage due to ‘1/f ‘noise is given by,

Noise Spectrum

V²= AR²I²∆f/f

Some of the non-essential noise sources

appear in this spectrum as spikes on the

intrinsic background. There are several

where A is a dimensionless constant, 10^-11

B - 1

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APPENDIX B

ways which these noise sources work their

way into an experiment.

3) Install capacitive shielding by placing

both the experiment and the detector in

a metal box.

Capacitive Coupling

A voltage on a nearby piece of apparatus

(or operator) can couple to a detector via a

stray capacitance. Although C_straymay be

very small, the coupled in noise may still be

larger than a weak experimental signal.

Inductive Noise Coupling

Inductive Coupling

Capacitive Noise Coupling

Here noise couples to the experiment via a

magnetic field:

To estimate the noise current through C_stray

into the detector we have

A changing current in a nearby circuit gives

rise to a changing magnetic field which

induces an emf in the loop connecting the

detector to the experiment, (emf = dØ_B/dt).

This is like a transformer, with the

experiment-detector loop as the secondary

winding.

I = C_straydV = jwc_strayV_noise

Where a reasonable approximation to C_stray

can be made by treating it as parallel plate

capacitor. Here, w is the radian frequency of

the noise source (perhaps 2 ∗ π ∗ 60 Hz),

Cures for inductively coupled noise include:

_noiseis the noise voltage source amplitude

(perhaps 120 VAC). For an area of A =

(0.01 m)²and a distance of d = 0.1 m, the

‘capacitor’ will have a value of 0.009 pF and

the resulting noise current will be 400 pA.

This meager current is about 4000 times

larger than the most sensitive current scale

that is available on the SR510 lock-in.

1) Remove or turn off the interfering noise

source (difficult to do if the noise is a

broadcast station).

2) Reduce the area of the pick-up loop by

using twisted pairs or coaxial cables, or

even twisting the 2 coaxial cables used

in differential hookups.

Cures for capacitive coupling of noise

signals include:

3) Use magnetic shielding to prevent the

magnetic field from inducing an emf (at

high frequencies a simple metal

enclosure is adequate).

1) Remove or turn off the interfering noise

source.

2) Measure voltages with low impedance

sources and measure currents with high

impedance sources to reduce the effect

4) Measure currents, not voltages, from

high impedance experiments.

of i_stray

B-2

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APPENDIX B

The capacitance of a coaxial cable is a

Resistive Coupling (or ‘Ground

Loops’)

function of its geometry so mechanical

vibrations will cause the cable capacitance

to vary with time.

Currents through common connections can

give rise to noise voltages.

Since C = Q/V, we have:

C dV + V dC = dQ = i

So mechanical vibrations will cause a dC/dt

which in turn gives rise to a current i, which

will affect the detector. Ways to eliminate

microphonic signals include:

1) Eliminate mechanical vibrations.

Resistive Coupling

2) Tie down experimental cables so they

will not sway to and fro.

Here, the detector is measuring the voltage

across the experiment, plus the voltage due

to the noise current passing through the

finite resistance of the ground bus. This

problem arises because we have used two

different grounding points, which are not at

exactly the same potential. Some cures for

ground loop problems include:

3) Use a low noise cable that is designed

to reduce microphonic effects.

Thermocouple Effect

The emf created by dissimilar metal

junctions can give rise to many microvolts of

DC potential, and can be a source of AC

noise if the temperature of the junction is

not held constant. This effect is large on the

scale of many low level measurements.

1) Ground everything to the same physical

point.

2) Use a heavier ground bus to reduce the

potential drop along the ground bus.

3) Remove sources of large currents from

ground wires used for small signals.

Microphonics

Microphonics provides a path for

mechanical noise to appear as electrical

noise in a circuit or experiment. Consider

the simple circuit below:

B-3

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APPENDIX B

B-4

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SR560 COMPONENT PARTS LIST

Front Panel Parts List

REF.

D 1

D 2

D 3

D 4

D 5

D 6

D 7

D 8

SRS part#

VALUE

RED

DESCRIPTION

LED, Rectangular

Diode

3-00884-306

3-00012-306

3-00885-306

3-00012-306

3-00885-306

3-00012-306

3-00004-301

3-00377-305

GREEN

YELLOW

GREEN

YELLOW

GREEN

1N4148

GL9ED2

D 9

D 10

D 11

D 12

D 13

D 14

D 15

D 16

D 17

D 18

D 19

D 20

D 21

D 22

D 23

D 24

D 25

D 26

D 27

D 28

D 29

D 30

D 31

D 32

D 33

D 34

D 35

D 36

D 37

D 38

D 39

D 40

D 41

D 42

D 43

D 44

D 45

D 46

D 47

Diode

LED, Rectangular, Bicolor

C-1

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SR560 COMPONENT PARTS LIST

D 48

J 1

N 1

N 2

N 3

N 4

N 5

P 1

Q 1

Q 2

R 1

R 2

R 3

3-00004-301

1-00035-130

4-00651-425

4-00336-425

4-00298-425

4-00611-452

3-00022-325

3-00021-325

4-00057-401

4-00059-401

4-00041-401

4-00081-401

2-00031-201

3-00303-340

7-00223-701

1N4148

20 PIN DIL

270X9

270X5

470X5

100K

2N3906

2N3904

220

22K

150

Diode

Connector, Male

Resistor Network SIP 1/4W 2% (Common)

Pot, Multi Turn Trim, Mini

Transistor, TO-92 Package

Resistor, Carbon Film, 1/4W, 5%

Switch, Momentary Push Button

Integrated Circuit (Thru-hole Pkg)

Printed Circuit Board

R 4

470

SW1

SW2

SW3

SW4

SW5

SW6

SW7

SW8

SW9

SW10

SW11

SW12

U 1

D6-01-05

74HC164

SR560-XX

U 2

U 3

U 4

U 5

Z 0

Main Board Parts List

REF.

BT1

BT2

SRS part#

VALUE

GB1219-36

10U

.1U

33P

6.8P

DESCRIPTION

6-00050-612

5-00098-517

5-00069-513

5-00013-501

5-00159-501

5-00019-501

Battery

BT3

C 101

C 102

C 103

C 104

C 106

C 107

C 108

C 109

C 110

C 111

Capacitor, Tantalum, 35V, 20%, Rad

Capacitor, Mylar/Poly, 50V, 5%, Rad

Capacitor, Ceramic Disc, 50V, 10%, SL

68P

C-2

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SR560 COMPONENT PARTS LIST

C 112

C 113

C 114

C 115

C 116

C 201

C 202

C 203

C 204

C 205

C 206

C 208

C 209

C 210

C 211

C 212

C 213

C 214

C 215

C 216

C 217

C 218

C 219

C 220

C 221

C 222

C 223

C 224

C 225

C 226

C 227

C 228

C 230

C 301

C 302

C 303

C 304

C 306

C 307

C 308

C 309

C 310

C 311

C 312

C 313

C 314

C 315

C 316

C 317

C 318

5-00023-529

.1U

2.2U

150P

68P

2.2U

270P

.001U

.0033U

.01U

.033U

.1U

.47U MIN

2.2U MIN

4.7U

47U

220U

470U

22U MIN

22P

2.2U

47P

2.2U

22P

270P

.001U

.0033U

.01U

.033U

.1U

.47U MIN

2.2U MIN

4.7U

Cap, Monolythic Ceramic, 50V, 20%, Z5U

5-00100-517

5-00005-501

5-00019-501

5-00100-517

5-00010-501

5-00061-513

5-00063-513

5-00065-513

5-00067-513

5-00023-529

5-00194-542

5-00193-542

5-00213-546

5-00033-520

5-00031-520

5-00232-520

5-00192-542

5-00008-501

5-00100-517

5-00017-501

5-00100-517

5-00008-501

5-00010-501

5-00061-513

5-00063-513

5-00065-513

5-00067-513

5-00023-529

5-00194-542

5-00193-542

5-00213-546

Capacitor, Tantalum, 35V, 20%, Rad

Capacitor, Ceramic Disc, 50V, 10%, SL

Capacitor, Tantalum, 35V, 20%, Rad

Capacitor, Ceramic Disc, 50V, 10%, SL

Capacitor, Mylar/Poly, 50V, 5%, Rad

Cap, Monolythic Ceramic, 50V, 20%, Z5U

Cap, Mini Electrolytic, 50V, 20% Radial

Cap, Mini Electro, 100V, 20%, Rad

Capacitor, Electrolytic, 16V, 20%, Rad

Cap, Mini Electrolytic, 50V, 20% Radial

Capacitor, Ceramic Disc, 50V, 10%, SL

Capacitor, Tantalum, 35V, 20%, Rad

Capacitor, Ceramic Disc, 50V, 10%, SL

Capacitor, Tantalum, 35V, 20%, Rad

Capacitor, Ceramic Disc, 50V, 10%, SL

Capacitor, Mylar/Poly, 50V, 5%, Rad

Cap, Monolythic Ceramic, 50V, 20%, Z5U

Cap, Mini Electrolytic, 50V, 20% Radial

Cap, Mini Electro, 100V, 20%, Rad

4.7U

C-3

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SR560 COMPONENT PARTS LIST

C 319

C 320

C 321

C 322

C 323

C 324

C 325

C 326

C 327

C 328

C 330

C 401

C 402

C 403

C 404

C 405

C 406

C 407

C 408

C 409

C 410

C 411

C 412

C 413

C 414

C 415

C 416

C 417

C 418

C 502

C 503

C 703

C 704

C 705

C 706

C 707

C 708

C 709

C 710

C 711

C 712

C 713

C 714

C 715

C 716

C 717

C 718

C 801

C 802

C 803

5-00033-520

47U

Capacitor, Electrolytic, 16V, 20%, Rad

5-00033-520

5-00031-520

5-00232-520

5-00023-529

5-00192-542

5-00100-517

5-00017-501

5-00100-517

5-00021-501

5-00107-530

5-00100-517

5-00002-501

5-00100-517

5-00061-513

5-00100-517

5-00023-529

5-00104-530

5-00233-532

5-00023-529

5-00234-551

5-00100-517

5-00227-526

5-00100-517

5-00023-529

5-00100-517

5-00023-529

5-00262-548

5-00225-548

Capacitor, Electrolytic, 16V, 20%, Rad

Cap, Monolythic Ceramic, 50V, 20%, Z5U

Cap, Mini Electrolytic, 50V, 20% Radial

Capacitor, Tantalum, 35V, 20%, Rad

Capacitor, Ceramic Disc, 50V, 10%, SL

Capacitor, Tantalum, 35V, 20%, Rad

Capacitor, Ceramic Disc, 50V, 10%, SL

Capacitor, Variable, Misc.

Capacitor, Tantalum, 35V, 20%, Rad

Capacitor, Ceramic Disc, 50V, 10%, SL

Capacitor, Tantalum, 35V, 20%, Rad

Capacitor, Mylar/Poly, 50V, 5%, Rad

Capacitor, Tantalum, 35V, 20%, Rad

Cap, Monolythic Ceramic, 50V, 20%, Z5U

Capacitor, Variable, Misc.

Capacitor, Ceramic Disc, 50V, 10% NPO

Cap, Monolythic Ceramic, 50V, 20%, Z5U

Capacitor, Electrolytic,35V,20%, Ax

Capacitor, Tantalum, 35V, 20%, Rad

Capacitor, Electrolytic, 35V, 20%, Rad

Capacitor, Tantalum, 35V, 20%, Rad

Cap, Monolythic Ceramic, 50V, 20%, Z5U

Capacitor, Tantalum, 35V, 20%, Rad

Cap, Monolythic Ceramic, 50V, 20%, Z5U

Capacitor, Ceramic, 50V,+80/-20% Z5U AX

220U

470U

.1U

22U MIN

2.2U

47P

2.2U

82P

1.8-6P

2.2U

100P

2.2U

.001U

2.2U

.1U

3.5-20P

22P

.1U

1000U

2.2U

100U

2.2U

.1U

2.2U

.1U

.01U AXIAL

.1U AXIAL

C-4

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SR560 COMPONENT PARTS LIST

C 804

C 805

C 806

C 807

C 808

C 809

C 810

C 811

C 812

C 813

C 814

C 815

C 816

C 817

C 818

C 819

C 820

C 821

C 822

C 823

C 824

C 825

C 826

C 827

C 828

C 829

C 830

C 831

C 832

D 101

D 201

D 202

D 301

D 302

D 401

D 402

D 403

D 404

D 405

D 406

D 407

D 408

D 501

D 502

D 503

D 505

D 701

D 702

D 703

D 704

5-00225-548

.1U AXIAL

.1U

Capacitor, Ceramic, 50V,+80/-20% Z5U AX

Cap, Monolythic Ceramic, 50V, 20%, Z5U

Capacitor, Ceramic, 50V,+80/-20% Z5U AX

Cap, Monolythic Ceramic, 50V, 20%, Z5U

Capacitor, Ceramic, 50V,+80/-20% Z5U AX

Cap, Monolythic Ceramic, 50V, 20%, Z5U

Capacitor, Tantalum, 35V, 20%, Rad

Cap, Monolythic Ceramic, 50V, 20%, Z5U

Capacitor, Tantalum, 35V, 20%, Rad

Cap, Monolythic Ceramic, 50V, 20%, Z5U

5-00225-548

5-00023-529

5-00225-548

5-00023-529

5-00225-548

5-00023-529

5-00100-517

5-00023-529

5-00100-517

5-00023-529

3-00368-301

3-00004-301

3-00226-301

3-00004-301

3-00226-301

3-00009-303

.1U AXIAL

.1U

.1U AXIAL

.1U

2.2U

.1U

2.2U

.1U

Cap, Monolythic Ceramic, 50V, 20%, Z5U

1N753A

1N4148

1N5822

1N4148

1N5822

YELLOW

Diode

LED, T1 Package

C-5

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SR560 COMPONENT PARTS LIST

D 705

D 706

D 707

D 708

D 709

D 710A

D 710B

D 711

D 801

D 802

D 803

J 101

J 102

J 404

J 405

J 601

J 805

JP801

K 101

K 102

K 103

K 104

K 105

K 201

K 301

N 701

N 702

P 101

P 102

P 103

P 104

P 701

P 702

Q 102

Q 103

Q 104

Q 105

Q 106

Q 107

Q 108

Q 109

Q 110

Q 111

Q 201

Q 202

Q 301

Q 302

Q 501

Q 701

Q 702

3-00011-303

3-00062-340

3-00226-301

3-00306-340

3-00391-301

3-00198-301

3-00226-301

3-00004-301

1-00073-120

1-00035-130

1-00073-120

1-00016-160

3-00308-335

4-00497-421

4-00501-425

4-00353-441

4-00487-441

4-00617-441

4-00011-441

3-00022-325

3-00021-325

3-00310-329

3-00887-325

RED

KBP201G/BR-81D

1N5822

LED, T1 Package

Integrated Circuit (Thru-hole Pkg)

Diode

1N5822

Diode

LM385BZ-2.5

MBR360

1N5231B

1N5822

1N4148

INSL

20 PIN DIL

INSL

RS232 25 PIN D

DS2E-ML2-DC5V

1.5KX4

1.0MX5

100

100K

10K

2N3906

Integrated Circuit (Thru-hole Pkg)

Diode

Connector, BNC

Connector, Male

Connector, BNC

Connector, D-Sub, Right Angle PC, Female

Relay

Res. Network, SIP, 1/4W,2% (Isolated)

Resistor Network SIP 1/4W 2% (Common)

Pot, Multi-Turn Trim, 3/8" Square Top Ad

Transistor, TO-92 Package

Voltage Reg., TO-220 (TAB) Package

Transistor, TO-92 Package

2N3906

2N3904

MTP25N05

MPS2907A

C-6

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SR560 COMPONENT PARTS LIST

Q 703

Q 801

R 2

3-00374-329

MTP20P06

MTP5N05

49.9

100M

249

150

100

1.000K

110

909

499

1.000K

165

100K

75.0K

1.0K

909

100

49.9K

10K

100K

909

100K

100

499

75K

100K

14.3K

20.0K

14.3K

22.6K

14.3K

22.6K

15.8K

22.6K

15.8K

Voltage Reg., TO-220 (TAB) Package

Resistor, 2W, 1%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

3-00376-329

4-00616-453

4-00306-407

4-00030-401

4-00169-407

4-00041-401

4-00141-407

4-00217-408

4-00030-401

4-00301-408

4-00619-408

4-00193-407

4-00528-408

4-00217-408

4-00544-407

4-00142-407

4-00203-407

4-00021-401

4-00215-407

4-00141-407

4-00192-407

4-00034-401

4-00142-407

4-00619-408

4-00142-407

4-00031-401

4-00528-408

4-00030-401

4-00102-401

4-00030-401

4-00142-407

4-00030-401

4-00516-407

4-00164-407

4-00516-407

4-00168-407

4-00516-407

4-00168-407

4-00600-407

4-00168-407

4-00600-407

R 101

R 102

R 103

R 104

R 105

R 106

R 108

R 109

R 110

R 111

R 112

R 113

R 114

R 115

R 116

R 117

R 118

R 119

R 120

R 121

R 122

R 123

R 124

R 125

R 126

R 127

R 128

R 129

R 130

R 131

R 132

R 133

R 134

R 135

R 136

R 137

R 201

R 202

R 203

R 204

R 205

R 206

R 207

R 208

R 209

R 210

R 211

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Metal Film, 1/8W, 0.1%, 25ppm

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 0.1%, 25ppm

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Metal Film, 1/8W, 0.1%, 25ppm

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Metal Film, 1/8W, 0.1%, 25ppm

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 0.1%, 25ppm

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

C-7

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SR560 COMPONENT PARTS LIST

R 212

R 213

R 214

R 215

R 216

R 217

R 218

R 219

R 220

R 221

R 222

R 223

R 224

R 225

R 226

R 227

R 228

R 229

R 301

R 302

R 303

R 304

R 305

R 306

R 307

R 308

R 309

R 310

R 311

R 312

R 313

R 314

R 315

R 316

R 317

R 318

R 319

R 320

R 321

R 322

R 323

R 324

R 325

R 326

R 327

R 328

R 329

R 330

R 401

R 402

4-00600-407

15.8K

200

845

604

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

4-00600-407

4-00030-401

4-00165-407

4-00030-401

4-00325-407

4-00030-401

4-00296-407

4-00165-407

4-00140-407

4-00188-407

4-00158-407

4-00048-401

4-00031-401

4-00305-401

4-00516-407

4-00164-407

4-00516-407

4-00168-407

4-00516-407

4-00168-407

4-00600-407

4-00168-407

4-00600-407

4-00030-401

4-00165-407

4-00030-401

4-00325-407

4-00030-401

4-00296-407

4-00165-407

4-00600-407

4-00705-407

4-00158-407

4-00048-401

4-00030-401

4-00031-401

4-00065-401

4-00030-401

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

200

10.2K

4.99K

2.00K

2.2K

100

4.3K

14.3K

20.0K

14.3K

22.6K

14.3K

22.6K

15.8K

22.6K

15.8K

200

845

604

200

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

15.8K

5.62K

2.00K

2.2K

100

3.3K

Resistor, Carbon Film, 1/4W, 5%

C-8

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SR560 COMPONENT PARTS LIST

R 403

R 404

R 405

R 406

R 407

R 408

R 409

R 410

R 411

R 412

R 413

R 415

R 416

R 417

R 418

R 419

R 420

R 421

R 422

R 423

R 424

R 425

R 426

R 427

R 428

R 429

R 430

R 431

R 432

R 433

R 434

R 435

R 436

R 437

R 438

R 439

R 440

R 441

R 442

R 501

R 502

R 503

R 602

R 603

R 701

R 702

R 703

R 704

R 705

R 706

4-00325-407

845

200

422

604

200

604

200

590

10.0K

4.99K

10.0K

4.22K

100

1.0K

10K

1.0K

1.0M

10.0K

220

49.9

100K

1.0K

5.62K

1.5K

100K

51K

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

4-00165-407

4-00030-401

4-00317-407

4-00296-407

4-00165-407

4-00296-407

4-00165-407

4-00555-407

4-00030-401

4-00138-407

4-00188-407

4-00138-407

4-00186-407

4-00030-401

4-00186-407

4-00141-407

4-00021-401

4-00034-401

4-00021-401

4-00022-401

4-00138-407

4-00057-401

4-00616-453

4-00142-407

4-00030-401

4-00021-401

4-00705-407

4-00027-401

4-00142-407

4-00088-401

4-00142-407

4-00022-401

4-00169-407

4-00042-401

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, 2W, 1%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

100K

1.0M

249

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

15K

C-9

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SR560 COMPONENT PARTS LIST

R 707

R 708

R 709

R 710

R 711

R 712

R 713

R 714

R 715

R 716

R 717

R 718

R 719

R 720

R 721

R 722

R 723

R 724

R 725

R 726

R 727

R 728

R 729

R 730

R 731

R 801

R 802

R 803

R 804

R 805

R 806

R 807

R 808

R 809

R 810

R 811

R 812

R 813

R 814

R 815

R 816

R 817

SO102

SO106

SO504

SO708

SO709

SW601

SW801

T 1

4-00042-401

4-00376-407

4-00169-407

4-00058-401

4-00035-401

4-00612-407

4-00278-407

4-00576-407

4-00386-407

4-00614-407

4-00613-407

4-00363-407

4-00383-407

4-00615-407

4-00207-407

4-00021-401

4-00032-401

4-00169-407

4-00582-407

4-00309-407

4-00022-401

4-00142-407

4-00031-401

4-00034-401

4-00192-407

4-00155-407

4-00062-401

4-00056-401

4-00087-401

4-00063-401

4-00027-401

4-00094-401

4-00079-401

4-00142-407

4-00092-401

4-00022-401

1-00173-150

1-00026-150

1-00570-150

2-00008-207

2-00023-218

6-00067-610

15K

2.87K

249

220K

10M

768K

10.7K

17.8K

30.9K

174K

147K

21.5K

12.7K

8.25K

806K

1.0K

100K

249

2.15K

3.32K

1.0M

100K

100

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Resistor, Metal Film, 1/8W, 1%, 50PPM

Resistor, Carbon Film, 1/4W, 5%

Socket, THRU-HOLE

10K

49.9K

150K

270

510

3.0K

1.5K

6.8K

4.7K

100K

56K

1.0M

8 PIN MACH

28 PIN 600 MIL

16 PIN

SPSTX4

DPDT

SR560

Socket, THRU-HOLE

Switch, DIP

Switch, Panel Mount, Power, Rocker

Transformer

C-10

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SR560 COMPONENT PARTS LIST

U 101

U 102

U 103

U 104

U 105

U 106

U 201

U 202

U 203

U 204

U 205

U 301

U 302

U 303

U 304

U 305

U 401

U 402

U 403

U 404

U 405

U 406

U 407

U 408

U 409

U 501

U 502

U 503

U 505

U 506

U 507

U 508

U 509

U 510

U 601

U 602

U 603

U 604

U 605

U 606

U 607

U 701

U 702

U 703

U 704

U 705

U 706

U 707

U 708

U 709

3-00371-340

DG444

OPA37

LF411

74HC4053

LT1028

NPD5564

OPA37

74HC4051

LF356

Integrated Circuit (Thru-hole Pkg)

3-00382-340

3-00090-340

3-00385-340

3-00297-340

3-00246-340

3-00382-340

3-00270-340

3-00189-340

3-00371-340

3-00270-340

3-00189-340

3-00371-340

3-00382-340

3-00371-340

3-00297-340

3-00382-340

3-00090-340

3-00241-340

3-00383-340

3-00243-340

3-00143-340

3-00371-340

3-00155-340

3-00045-340

3-00298-340

3-00081-341

3-00039-340

3-00158-340

3-00049-340

3-00277-340

3-00259-340

3-00046-340

3-00044-340

3-00384-329

3-00141-329

3-00067-340

3-00152-340

3-00239-335

3-00149-329

3-00141-329

8-00072-860

Integrated Circuit (Thru-hole Pkg)

STATIC RAM, I.C.

Integrated Circuit (Thru-hole Pkg)

Voltage Reg., TO-220 (TAB) Package

Integrated Circuit (Thru-hole Pkg)

Relay

DG444

74HC4051

LF356

DG444

OPA37

DG444

LT1028

OPA37

LF411

AD7528JN

LM6321

LM837

LM393

DG444

74HC04

74HC32

Z84C0008PEC

2KX8-100

74HC14

74HC154N

74HC74

74HC11

74HCT373

74HC374

74HC244

LM350T

LM337T

CD4013

CD4051

HS-212-12

LM317T

LM337T

SR566 ASSY

Voltage Reg., TO-220 (TAB) Package

SRS sub assemblies

C-11

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SR560 COMPONENT PARTS LIST

U 801

U 802

U 803

U 804

Z 0

3-00112-329

7805

LM2940T-10

LF411

PS2501A-2

6J4

TRANSCOVER

4-40 HEX

4-40 KEP

6-32 KEP

3/16"X5/16"NYLN

4-40X3/16 M/F

Voltage Reg., TO-220 (TAB) Package

3-00307-340

3-00090-340

3-00250-340

0-00014-002

0-00017-002

0-00042-010

0-00043-011

0-00048-011

0-00077-030

0-00079-031

0-00089-033

0-00096-041

0-00109-050

0-00111-053

0-00122-053

0-00126-053

0-00128-053

0-00136-053

0-00153-057

0-00209-021

0-00231-043

0-00233-000

0-00237-016

0-00240-026

0-00242-026

0-00243-003

0-00249-021

0-00256-043

0-00259-021

0-00268-052

0-00284-025

0-00299-000

0-00312-000

0-00321-035

0-00322-035

0-00323-035

0-00324-035

0-00325-032

0-00327-050

0-00328-050

0-00329-050

0-00330-050

0-00333-052

0-00334-052

0-00350-053

0-00355-050

0-00466-050

0-00523-048

0-00524-048

Integrated Circuit (Thru-hole Pkg)

Power Entry Hardware

Nut, Hex

Nut, Kep

Spacer

Standoff

Tie

#4 SPLIT

Washer, Split

1-1/2" #18

1-3/4"#24B

2-1/4" #24

3-1/2" #24

4" #24

8-1/2" #24

GROMMET2

4-40X3/8PP

1-32, #4 SHOULD

HANDLE1

F1404

Wire #18 UL1007 Stripped 3/8x3/8 No Tin

Wire #24 UL1007 Strip 1/4x1/4 Tin

Grommet

Screw, Panhead Phillips

Washer, nylon

Hardware, Misc.

Power Button

4-40X3/8PF

8-32X1/4PF

TO-220

Screw, Black, All Types

Insulators

Screw, Panhead Phillips

Washer, nylon

Screw, Panhead Phillips

Wire #22 UL1007

Screw, Allen Head

Hardware, Misc.

BANANA JACK

Termination

Wire #18 UL1007 Stripped 3/8x3/8 No Tin

Wire #22 UL1007

6-32X1-1/2PP

#6 SHOULDER

4-40X1/2"PP

6-1/2" #22 BL

10-32X1/2

1/8" ADHES TAPE

FUSEHOLDER

BLACK

RED

GREEN

WHITE

2-520182-2

8" #18 WHITE

8" #18 RED

8" #18 BLACK

5-1/2" #18

6" #22

1-3/4" #22

2-1/4" #24

20" #18 RED

23" #18 BLACK

5-5/8" #18

8-1/4" #18

Wire #22 UL1007

Wire #24 UL1007 Strip 1/4x1/4 Tin

Wire #18 UL1007 Stripped 3/8x3/8 No Tin

Wire, #18 UL1015 Strip 3/8 x 3/8 No Tin

C-12

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SR560 COMPONENT PARTS LIST

Z 0

0-00666-050

23" #18 WHITE

20" #18 WHITE

4 PIN

Wire #18 UL1007 Stripped 3/8x3/8 No Tin

0-00667-050

1-00124-178

1-00125-179

1-00126-176

1-00127-177

1-00128-171

4-00541-435

5-00027-503

6-00004-611

6-00074-611

7-00194-715

7-00201-720

7-00222-701

7-00232-709

7-00251-720

7-00252-720

7-00257-720

7-00258-720

7-00680-720

7-00795-720

7-00796-720

9-00127-907

9-00267-917

9-00792-917

Wire #18 UL1007 Stripped 3/8x3/8 No Tin

Connector Housing, Plug

Connector Housing, Receptacle

Terminal, Male

Terminal, Female

Cable Assembly, Ribbon

Varistor, Zinc Oxide Nonlinear Resistor

Capacitor, Ceramic Disc, 50V, 20%, Z5U

Fuse

Bracket

Fabricated Part

Printed Circuit Board

Lexan Overlay

Fabricated Part

Shrink Tubing

4 PIN

.062" DIAM

20 COND

130V/1200A

.01U

1A 3AG

3A 3AG

PS300-38

SR500-32

SR560-XX

SR560-4

SR560-21

SR560-23-25

SR560-20

SR560-26

PS300-52

BATTERY PAN

BATTERY RETAINR

1/2" CLEAR

GENERIC

EC WARNING

Product Labels

Miscellaneous Parts List

REF.

U 504

Z 0

SRS part#

VALUE

DESCRIPTION

3-00305-342

0-00150-026

0-00179-000

0-00180-000

0-00185-021

0-00204-000

0-00248-026

0-00315-021

0-00326-026

7-00122-720

7-00217-735

7-00259-720

7-00260-720

27C64-255

4-40X1/4PF

RIGHT FOOT

LEFT FOOT

6-32X3/8PP

REAR FOOT

10-32X3/8TRUSSP

6-32X7/16 PP

8-32X1/4PP

DG535-36

EPROM/PROM, I.C.

Screw, Black, All Types

Hardware, Misc.

Screw, Panhead Phillips

Hardware, Misc.

Screw, Black, All Types

Screw, Panhead Phillips

Screw, Black, All Types

Fabricated Part

Injection Molded Plastic

Fabricated Part

PS300-40

SR560-28

SR560-27

Z 0

Fabricated Part

C-13

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SR560 COMPONENT PARTS LIST

C-14

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