Tektronix Work Light THS710A User Manual

Service Manual  
THS710A, THS720A,  
THS730A & THS720P  
TekScopet  
070-9752-01  
This document applies to to serial number  
B010100 and above and firmware version 1.00  
and above.  
First printing: February 1998  
Warning  
The servicing instructions are for use by qualified  
personnel only. To avoid personal injury, do not  
perform any servicing unless you are qualified to  
do so. Refer to all safety summaries prior to  
performing service.  
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WARRANTY  
Tektronix warrants that this product will be free from defects in materials and workmanship for a period of three (3) years  
from the date of purchase from an authorized Tektronix distributor. If any such product proves defective during this  
warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will  
provide a replacement in exchange for the defective product. Batteries are excluded from this warranty.  
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the  
warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for  
packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid.  
Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the  
Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any  
other charges for products returned to any other locations.  
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate  
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting  
from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair  
damage resulting from improper use or connection to incompatible equipment; or c) to service a product that has been  
modified or integrated with other products when the effect of such modification or integration increases the time or  
difficulty of servicing the product.  
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY  
OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY  
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND  
EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX  
AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR  
CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS  
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  
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Service Assurance  
If you have not already purchased Service Assurance for this product, you may do so at any time during the product’s  
warranty period. Service Assurance provides Repair Protection and Calibration Services to meet your needs.  
Repair Protection extends priority repair services beyond the product’s warranty period; you may purchase up to three  
years of Repair Protection.  
Calibration Services provide annual calibration of your product, standards compliance and required audit documentation,  
recall assurance, and reminder notification of scheduled calibration. Coverage begins upon registration; you may purchase  
up to five years of Calibration Services.  
Service Assurance Advantages  
H Priced well below the cost of a single repair or calibration  
H Avoid delays for service by eliminating the need for separate purchase authorizations from your company  
H Eliminates unexpected service expenses  
For Information and Ordering  
For more information or to order Service Assurance, contact your local Tektronix representative and provide the informa-  
tion below. Service Assurance may not be available in locations outside the United States of America.  
Name  
VISA or Master Card number and expiration  
date or purchase order number  
Repair Protection (1,2, or 3 years)  
Calibration Services (1,2,3,4, or 5 years)  
Instrument model and serial number  
Instrument purchase date  
Company  
Address  
City, State, Postal code  
Country  
Phone  
To learn the location of your nearest Tektronix representative, please call 1-800-TEK-WIDE in North America,  
1-503-627-7111 elsewhere, or look us up on the World Wide Web at http://www.tek.com.  
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Table of Contents  
General Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Service Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
v
vii  
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
ix  
ix  
x
Specifications  
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
1–1  
Operating Information  
Internal and External Power Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Understanding the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Connecting and Using the Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
2–1  
2–3  
2–8  
Theory of Operation  
Main Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Inverter Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Display Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Switch Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
3–1  
3–1  
3–2  
3–2  
Performance Verification  
Test Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Performance Verification Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
4–2  
4–4  
Adjustment Procedures  
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Overview of the Adjustment Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Accessing the Adjustment-Lockout Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Oscilloscope Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Meter Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Replacing the Adjustment-Lockout Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
5–1  
5–2  
5–3  
5–5  
5–8  
5–11  
Maintenance  
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Preventing ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Inspection and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Removal and Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Unpacking and Repacking Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
6–1  
6–1  
6–2  
6–5  
6–28  
6–40  
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Table of Contents  
Options  
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
7–1  
8–1  
9–1  
Electrical Parts List  
Diagrams  
Mechanical Parts List  
Parts Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Using the Replaceable Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
10–1  
10–2  
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Table of Contents  
List of Figures  
Figure 2–1: Removing and replacing the battery . . . . . . . . . . . . . . . . .  
2–2  
2–2  
2–3  
2–4  
2–8  
Figure 2–2: AC adapter attachment . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 2–3: Typical scope-mode display . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 2–4: Typical meter-mode display . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 2–5: Connector locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 3–1: Module-level block diagram . . . . . . . . . . . . . . . . . . . . . . .  
3–2  
Figure 5–1: Location of adjustment-lockout jumper . . . . . . . . . . . . . .  
Figure 5–2: Oscilloscope adjustment setups . . . . . . . . . . . . . . . . . . . . .  
Figure 5–3: Meter adjustment setups . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 5–4: Relocating the adjustment-lockout jumper . . . . . . . . . . .  
5–4  
5–6  
5–9  
5–11  
Figure 6–1: Removing the tilt stand . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 6–2: Installing the tilt stand . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 6–3: Installing a new front-panel label . . . . . . . . . . . . . . . . . . .  
Figure 6–4: Removing the battery door . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 6–5: Assembling a new front cover . . . . . . . . . . . . . . . . . . . . . .  
Figure 6–6: Installing the gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 6–7: Installing the handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 6–8: Removing the display module . . . . . . . . . . . . . . . . . . . . . .  
Figure 6–9: Opening the display cable connector . . . . . . . . . . . . . . . .  
Figure 6–10: Routing cables to the inverter board . . . . . . . . . . . . . . .  
Figure 6–11: Lifting the chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 6–12: Foam pad and hole plug locations on the back cover . .  
Figure 6–13: Routing the battery wires . . . . . . . . . . . . . . . . . . . . . . . . .  
6–8  
6–9  
6–10  
6–12  
6–13  
6–14  
6–15  
6–17  
6–18  
6–19  
6–20  
6–21  
6–22  
Figure 6–14: Removing the main board and switch flex-circuit  
assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
6–24  
6–25  
6–27  
6–29  
6–31  
Figure 6–15: Foam pad locations on the chassis . . . . . . . . . . . . . . . . . .  
Figure 6–16: Reassembling the chassis . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 6–17: Battery connector location . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 6–18: Bypassing the ON/STBY switch . . . . . . . . . . . . . . . . . . .  
Figure 10–1: Exploded diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
10–5  
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Table of Contents  
List of Tables  
Table 1–1: Oscilloscope specifications . . . . . . . . . . . . . . . . . . . . . . . . .  
Table 1–2: DMM specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Table 1–3: General specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
1–1  
1–8  
1–10  
Table 5–1: Summary of oscilloscope adjustment steps . . . . . . . . . . . .  
Table 5–2: Summary of meter adjustment steps . . . . . . . . . . . . . . . . .  
5–5  
5–8  
Table 6–1: Internal inspection check list . . . . . . . . . . . . . . . . . . . . . . .  
Table 6–2: Removal and installation procedures . . . . . . . . . . . . . . . . .  
6–3  
6–6  
Table 7–1: TekScope instrument options . . . . . . . . . . . . . . . . . . . . . . .  
Table 10–1: Replaceable standard accessories . . . . . . . . . . . . . . . . . . .  
7–1  
10–6  
iv  
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General Safety Summary  
Review the following safety precautions to avoid injury and prevent damage to  
this product or any products connected to it. To avoid potential hazards, use this  
product only as specified.  
Only qualified personnel should perform service procedures.  
To Avoid Fire or  
Personal Injury  
Connect and Disconnect Properly. Do not connect or disconnect probes or test  
leads while they are connected to a voltage source.  
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings  
and markings on the product. Consult the product manual for further ratings  
information before making connections to the product.  
Do not apply a potential to any terminal, including the common terminal, that  
exceeds the maximum rating of that terminal.  
Replace Batteries Properly. Replace batteries only with the proper type and rating  
specified.  
Recharge Batteries Properly. Recharge batteries for the recommended charge  
cycle only.  
Use Proper AC Adapter. Use only the AC adapter specified for this product.  
Do Not Operate Without Covers. Do not operate this product with covers or panels  
removed.  
Avoid Exposed Circuitry. Do not touch exposed connections and components  
when power is present.  
Do Not Operate With Suspected Failures. If you suspect there is damage to this  
product, have it inspected by qualified service personnel.  
Do Not Operate in Wet/Damp Conditions.  
Do Not Operate in an Explosive Atmosphere.  
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General Safety Summary  
Symbols and Terms  
Terms in this Manual. These terms may appear in this manual:  
WARNING. Warning statements identify conditions or practices that could result  
in injury or loss of life.  
CAUTION. Caution statements identify conditions or practices that could result in  
damage to this product or other property.  
Terms on the Product. These terms may appear on the product:  
DANGER indicates an injury hazard immediately accessible as you read the  
marking.  
WARNING indicates an injury hazard not immediately accessible as you read the  
marking.  
CAUTION indicates a hazard to property including the product.  
Symbols on the Product. The following symbols may appear on the product:  
Double  
Insulated  
Protective Ground  
(Earth) Terminal  
CAUTION  
Refer to Manual  
WARNING  
High Voltage  
Battery Recycling  
This product contains a Nickel Cadmium (NiCd) battery, which must be recycled  
or disposed of properly. For the location of a local battery recycler in the U.S. or  
Canada, please contact:  
RBRC  
(800) BATTERY  
(800) 227-7379  
www.rbrc.com  
Rechargeable Battery Recycling Corp.  
P.O. Box 141870  
Gainesville, Florida 32614  
vi  
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Service Safety Summary  
Only qualified personnel should perform service procedures. Read this Service  
Safety Summary and the General Safety Summary before performing any service  
procedures.  
Do Not Service Alone. Do not perform internal service or adjustments of this  
product unless another person capable of rendering first aid and resuscitation is  
present.  
Use Care When Servicing With Power On. Dangerous voltages or currents may  
exist in this product. Disconnect power, remove battery (if applicable), and  
disconnect test leads before removing protective panels, soldering, or replacing  
components.  
To avoid electric shock, do not touch exposed connections.  
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Service Safety Summary  
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Preface  
This is the Service Manual for the THS710A, THS720A, THS730A, and  
THS720P TekScope instruments. This manual provides information to trouble-  
shoot and repair the instrument to the module level.  
Related Manuals  
Additional documentation for the instrument is contained in the related manuals  
listed below.  
User Manual  
Part Number  
Reference  
Part Number  
Programmer Manual  
Part Number  
Language  
English  
070-9731-XX  
070-9732-XX  
070-9733-XX  
070-9734-XX  
070-9735-XX  
070-9736-XX  
070-9737-XX  
070-9738-XX  
070-9739-XX  
070-9741-XX  
070-9742-XX  
070-9743-XX  
070-9744-XX  
070-9745-XX  
070-9746-XX  
070-9747-XX  
070-9748-XX  
070-9749-XX  
070-9751-XX  
French  
German  
Italian  
Korean  
Portuguese  
Spanish  
Simplified Chinese  
Traditional  
Chinese  
Japanese  
070-9740-XX  
070-9799-00  
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Preface  
Conventions  
In the Performance Verification, Adjustments, and Maintenance chapters of this  
manual, TekScope instrument setups are shown in tables similar to the one  
shown below.  
The header of each table contains icons that represent the controls and menu  
items used to set up the instrument. To make a specific setup, read the table from  
left to right and then from top to bottom as shown below. The table contains the  
symbol “—” if no action is required.  
1. Choose scope 2. Press this but- 3. Press this  
4. Press the  
bezel button  
again until this  
5. Use the  
/– rocker to set  
the value for a  
+
mode or meter  
mode.  
ton on the front  
panel.  
bezel button.  
selection is high- parameter.  
lighted.  
6.  
8.  
7.  
9.  
10.  
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Specifications  
This chapter contains the oscilloscope, DMM, and general specifications for the  
THS710A, THS720A, THS730A, and THS720P TekScope instruments. All  
specifications are guaranteed unless noted “typical.” Typical specifications are  
provided for your convenience but are not guaranteed. Specifications that are  
marked with the n symbol are checked in the chapter Performance Verification.  
All specifications apply to all four instruments unless noted otherwise. All  
specifications assume horizontal MAG is off, unless noted otherwise. To meet  
specifications, two conditions must first be met:  
H
H
The TekScope instrument must have been operating continuously for ten  
minutes within the operating temperature range specified.  
You must perform the Compensate Signal Path operation, accessible through  
the utility menu, if the ambient temperature changes by more than 5° C.  
Table 1–1: Oscilloscope specifications  
Acquisition  
Acquisition Modes  
Sample (Normal), Peak detect, Envelope, and Average  
Acquisition Rate,  
typical  
Up to 25 waveforms per second (2 channels, sample acquisition mode,  
MAG on, no measurements)  
Single Sequence  
Acquisition Mode  
Acquisition Stops After  
Sample, Peak Detect  
Single acquisition, one or two  
channels simultaneously  
Average, Envelope  
N acquisitions, one or two chan-  
nels simultaneously, N is settable  
from 2 to 256 or  
Inputs  
Input Coupling  
DC, AC, or GND  
Input Impedance,  
DC Coupled  
1 MW ±1% in parallel with 25 pF ±2 pF  
Maximum Voltage  
Between Signal and  
Common at Input  
BNC  
Overvoltage Category  
Maximum Voltage  
CAT II Environment (refer to  
page 1–13)  
300 V  
RMS  
CAT III Environment (refer to  
page 1–13)  
150 V  
RMS  
For steady-state sinusoidal waveforms, derate at 20 dB/decade above  
100 kHz to 13 V at 3 MHz and above. Also, refer to Overvoltage  
pk  
Category description on page 1–13.  
1–1  
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Specifications  
Table 1–1: Oscilloscope specifications (Cont.)  
Inputs  
Maximum Voltage  
Between Common  
and Earth Ground  
at BNC  
600 V  
accessories  
(CAT II) or 300 V  
(CAT III), using rated connectors or  
RMS  
RMS  
30 V , 42.4 V , using noninsulated connectors and acessories  
RMS  
pk  
Maximum Voltage,  
Channel-to-Channel  
Commons  
30 V , 42.4 V , using noninsulated connectors and acessories  
RMS pk  
Channel-to-Channel  
Common Mode  
Rejection, typical  
100:1 at frequencies 50 MHz, measured on MATH Ch1 – Ch2  
waveform, with test signal applied between signal and common of both  
channels, and with the same VOLTS/DIV and coupling settings on each  
channel  
Channel-to-Channel  
Crosstalk, typical  
100:1 at 50 MHz, measured on one channel, with test signal applied  
between signal and common of the other channel, and with the same  
VOLTS/DIV and coupling settings on each channel  
Common to Chassis  
Capacitance, typical  
55 pF  
Vertical  
Number of Channels  
Digitizers  
2
8 bit resolution, separate digitizers for each channel sample  
simultaneously  
VOLTS/DIV Range  
Polarity  
5 mV/div to 50 V/div at input BNC  
Normal and Invert  
Position Range  
±10 divisions  
n Analog Bandwidth THS710A  
THS720A  
THS720P  
THS730A  
at BNC, DC Coupled  
60 MHz at input 100 MHz at  
100 MHz at  
input BNC  
200 MHz at  
input BNC  
(typical at 5 mV/div,  
guaranteed at all  
other settings)  
BNC  
input BNC  
(90 MHz above (90 MHz above (180 MHz  
35° C)  
35° C)  
above 35° C)  
Peak Detect or Enve- THS710A  
THS720A  
THS720P  
THS730A  
lope Bandwidth,  
typical (25 MS/s or  
slower)  
50 MHz  
75 MHz  
75 MHz  
85 MHz  
Analog Bandwidth  
Limit, typical  
Selectable between 20 MHz or full  
Lower Frequency  
Limit, AC Coupled,  
typical  
10 Hz at BNC, reduced by a factor of ten when using a 10X passive  
probe  
Rise Time at BNC,  
typical  
THS710A  
THS720A  
THS720P  
THS730A  
5.8 ns  
3.5 ns  
3.5 ns  
1.75 ns  
Peak Detect or Enve- Captures 50% or greater amplitude of pulses 8 ns wide (20 ns wide  
lope Pulse Response, at 500 ns/div)  
typical  
1–2  
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Specifications  
Table 1–1: Oscilloscope specifications (Cont.)  
Vertical  
DC Gain Accuracy  
Position Accuracy  
±2% for Sample or Average acquisition mode  
±[0.4% × |(position × volts/div)| + (0.1 div × volts/div)]  
n DC Measurement Measurement Type  
Accuracy  
Accuracy, Average  
Absolute voltage measurements  
±[2% × |reading +  
Acquisition Mode  
Using 16 Wave-  
forms  
(position × volts/div)| +  
(0.1 div × volts/div)]  
Delta voltage between any two  
waveforms acquired under same  
setup  
±[2% × |reading| +  
(0.05 div × volts/div)]  
DC Measurement  
Accuracy, Sample  
Acq. Mode, typical  
±[2% × |reading + (position × volts/div)| + (0.15 div × volts/div) +  
0.6 mV]  
Horizontal  
Sample Rate Range  
THS710A  
THS720A  
THS720P  
THS730A  
5 S/s to  
5 S/s to  
5 S/s to  
5 S/s to 1 GS/s,  
in a 1.25, 2.5, 5  
sequence  
250 MS/s, in a  
1.25, 2.5, 5  
sequence  
500 MS/s, in a  
1.25, 2.5, 5  
sequence  
500 MS/s, in a  
1.25, 2.5, 5  
sequence  
Record Length  
2500 samples for each channel  
SEC/DIV Range  
(including MAG)  
THS710A  
THS720A  
THS720P  
THS730A  
10 ns/div to  
50 s/div  
5 ns/div to  
50 s/div  
5 ns/div to  
50 s/div  
2 ns/div to  
50 s/div  
n Sample Rate and ±200 ppm over any 1 ms time interval  
Delay Time Accuracy  
Delay Time Range  
Zero to 50 s  
Internal Trigger  
n Trigger Sensitivity, Coupling  
(THS710A, THS720A,  
Sensitivity  
Edge Trigger Type  
DC  
0.35 div from DC to 50 MHz,  
increasing to 1 div at 100 MHz  
(90 MHz above 35° C)  
and THS720P)  
n Trigger Sensitivity, Coupling  
(THS730A)  
Sensitivity  
Edge Trigger Type  
DC  
0.35 div from DC to 50 MHz,  
increasing to 1.5 div at 200 MHz  
(180 MHz above 35° C)  
1–3  
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Specifications  
Table 1–1: Oscilloscope specifications (Cont.)  
Internal Trigger  
Trigger Sensitivity,  
Edge Trigger Type,  
typical  
Coupling  
NOISE REJ  
HF REJ  
Sensitivity  
3.5 times the DC-coupled limits  
1.5 times the DC-coupled limit  
from DC to 30 kHz, attenuates  
signals above 30 kHz  
LF REJ  
1.5 times the DC-coupled limits  
for frequencies above 1 kHz,  
attenuates signals below 1 kHz  
Trigger Level Range  
±4 divisions from center of screen  
Motor Trigger Level  
Range (THS720P)  
0.1 to 5 divisions from center screen, polarity depends on slope  
selection  
Trigger Level  
Accuracy, typical  
±0.2 divisions, for signals having rise and fall times 20 ns  
SET LEVEL TO 50%, Operates with input signals 50 Hz  
typical  
Width Range, Pulse  
Trigger Type, typical  
99 ns to 1 s, with resolution of 33 ns or approximately 1% of setting  
(whichever is greater)  
Width Tolerance  
Range, Pulse Trigger  
Type, typical  
5%, 10%, 15%, or 20%  
Sensitivity, Video  
Trigger Type, typical  
Composite video signal with negative sync pulse amplitude from 0.6  
to 2.5 divisions  
Signal Formats and  
Field Rates, Video  
Trigger Type  
Broadcast systems  
Supports NTSC, PAL, and  
SECAM  
Interlaced  
Trigger on selected line of odd  
field, selected line of even field, or  
any line  
Non-interlaced  
Line Rates  
Trigger on selected line or any line  
15 kHz to 65 kHz, in five ranges  
Holdoff Range  
495 ns to 10 s  
External Trigger  
External Trigger, Max- 600 V  
imum Input Voltage  
CAT II or 300 V  
CAT III (refer to page 1–13)  
RMS  
RMS  
External Trigger  
Coupling  
DC only  
+0.2 V or +2 V, selectable  
External Trigger  
Levels  
External Trigger  
Sensitivity  
500 mV from DC to 1 MHz, increasing to 1 V at 5 MHz, with  
p-p p-p  
signal centered at selected trigger level  
1–4  
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Specifications  
Table 1–1: Oscilloscope specifications (Cont.)  
Measurements  
Cursors  
Voltage difference between cursors (DV)  
Time difference between cursors (DT)  
Reciprocal of DT in Hertz (1/DT)  
Phase difference between cursors (DDegrees)  
Automated  
Measurements  
Amplitude, Burst Width, Cycle Mean, Cycle RMS, Fall Time,  
Frequency, High, Low, Max, Mean, Min, Negative Duty Cycle, Negative  
Overshoot, Negative Width, Pk – Pk, Period, Positive Duty Cycle,  
Positive Overshoot, Positive Width, Rise Time, and RMS  
Voltage and Current Harmonics (THS720P)  
Number of Harmonics First 31 harmonics of signal with fundamental frequency between  
30 Hz and 450 Hz  
Harmonics Amplitude Accuracies below are stated as a percent of the fundamental amplitude  
Accuracy  
and are valid only if peak-to-peak amplitude is 4 divisions and number  
of averages 16  
Fundamental  
±2.5%  
2 – 11  
±2.5%  
2 – 11  
±4 °  
12 – 21  
±4%  
22 – 31  
±4%  
Harmonics Phase  
Accuracy  
Fundamental  
12 – 21  
±8 °  
22 – 31  
±8 °  
THD-F Measurement Total harmonic distortion relative to the fundamental amplitude  
VR2MS Vf2 AR2MS Af2  
Af  
THD-F  
±4%  
or  
Vf  
THD-F Accuracy  
THD-R Measurement Total harmonic distortion relative to the RMS amplitude  
VR2MS Vf2 AR2MS Af2  
ARMS  
THD-R  
or  
VRMS  
THD-R Accuracy  
±4%  
±0.2% of reading  
Frequency Accuracy  
Power Measurements (THS720P)  
True Power  
Measurement  
1
n
W
Vn An  
n
measured over an integral number of cycles that  
contain n sample points  
Apparent Power  
Measurement  
VA  
VRMS ARMS  
Reactive Power  
Measurement  
VAR  
(VA) 2 W 2  
Power Measurements ±4% at the BNCs (not including probe uncertainty)  
Accuracy  
1–5  
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Specifications  
Table 1–1: Oscilloscope specifications (Cont.)  
Power Measurements (THS720P)  
PF Measurement  
true power  
apparent power  
W
VA  
Power factor (PF)  
q Measurement  
q is the phase difference between the fundamental components of  
voltage and current. Positive angle means voltage leads current.  
Negative angle means voltage lags current.  
DPF Measurement  
Displacement power factor (DPF) = cos q  
Power Factor Mea-  
surements Accuracy  
±0.05  
With P6117 Probe  
Analog Bandwidth,  
DC Coupled  
THS710A  
THS720A  
THS720P  
THS730A  
60 MHz  
100 MHz  
100 MHz  
200 MHz  
(90 MHz above (90 MHz above (180 MHz  
35° C)  
35° C)  
above 35° C)  
Probe Attenuation  
10X  
Maximum Voltage  
Between Probe Tip  
and Reference Lead  
Overvoltage Category  
Maximum Voltage  
CAT II Environment (refer to  
page 1–13)  
300 V  
RMS  
CAT III Environment (refer to  
page 1–13)  
150 V  
RMS  
For steady-state sinusoidal waveforms, derate at 20 dB/decade above  
900 kHz to 13 V at 27 MHz and above. Also, refer to Overvoltage  
pk  
Category description on page 1–13.  
Maximum Voltage  
Between Reference  
Lead and Earth  
Ground Using P6117  
Probe  
30 V , 42.4 V  
RMS  
pk  
Maximum Voltage,  
Channel-to-Channel  
Reference Leads  
Using P6117 Probe  
30 V , 42.4 V  
RMS  
pk  
1–6  
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Specifications  
Table 1–1: Oscilloscope specifications (Cont.)  
With P5102 Probe  
Analog Bandwidth,  
DC Coupled  
THS710A  
THS720A  
THS720P  
THS730A  
60 MHz  
100 MHz  
100 MHz  
100 MHz  
(90 MHz above (90 MHz above  
35° C)  
35° C)  
Probe Attenuation  
10X  
Maximum Voltage  
Between Probe Tip  
and Reference Lead,  
DC Coupled  
Overvoltage Category  
Maximum Voltage  
CAT II Environment (refer to  
page 1–13)  
1000 V  
RMS  
CAT III Environment (refer to  
page 1–13)  
600 V  
RMS  
Maximum Voltage  
Between Probe Tip  
and Reference Lead,  
AC Coupled  
Overvoltage Category  
CAT II Environment  
CAT III Environment  
Overvoltage Category  
CAT II Environment  
CAT III Environment  
Maximum Voltage  
±1000 V  
DC  
±600 V  
DC  
Maximum Voltage  
Between Reference  
Lead and Earth  
Ground  
Maximum Voltage  
600 V  
RMS  
RMS  
300 V  
1–7  
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Specifications  
Table 1–2: DMM specifications  
General  
3
Resolution  
3 digit, 4000 count full scale reading except as noted  
4
Input Resistance, AC 10 MW ±10%  
or DC Voltage  
Input Capacitance,  
AC or DC Voltage,  
typical  
100 pF  
Maximum Voltage  
Between DMM and  
COM Inputs  
Overvoltage Category  
Maximum Voltage  
CAT I Environment (refer to  
page 1–13)  
640 V  
600 V  
300 V  
(880 V  
)
)
RMS  
RMS  
RMS  
DC  
CAT II Environment (refer to  
page 1–13)  
CAT III Environment (refer to  
page 1–13)  
Maximum Voltage  
Between DMM or  
COM Input and Earth  
Ground  
Overvoltage Category  
Maximum Voltage  
CAT I Environment (refer to  
page 1–13)  
640 V  
600 V  
300 V  
(880 V  
DC  
RMS  
RMS  
RMS  
CAT II Environment (refer to  
page 1–13)  
CAT III Environment (refer to  
page 1–13)  
DC Voltage  
Ranges and  
Resolution  
Range  
Resolution  
0.1 mV  
1 mV  
400.0 mV  
4.000 V  
40.00 V  
10 mV  
100 mV  
1 V  
400.0 V  
880 V  
n Accuracy  
±(0.5% of reading + 5 counts)  
Normal Mode  
Rejects AC signals by >60 dB at 50 Hz or 60 Hz (user selectable)  
Rejection, typical  
Common Mode  
Rejects AC signals by >100 dB at 50 Hz or 60 Hz (user selectable)  
Rejection, typical  
1–8  
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Specifications  
Table 1–2: DMM specifications (Cont.)  
AC Voltage  
Conversion Type  
AC conversions are true RMS. The AC measurement is based on the  
AC and DC components of the signal as shown below:  
AC Measurement = RMS(AC+DC) – DC  
Ranges and  
Resolution  
Range  
Resolution  
400.0 mV  
4.000 V  
0.1 mV  
1 mV  
40.00 V  
10 mV  
400.0 V  
100 mV  
640 V  
1 V  
n Accuracy  
Input Waveform  
Sinusoidal waveforms  
Maximum Error  
±(2% of reading + 5 counts)  
±(4% of reading + 5 counts)  
(40 Hz to 500 Hz)  
Nonsinusoidal waveforms with  
crest factor up to 3  
Common Mode  
Rejects AC signals by >60 dB at DC, 50 Hz, and 60 Hz  
Rejection, typical  
W/Resistance  
Ranges and  
Resolution  
Range  
Resolution  
400.0 W  
0.1 W  
4.000 kW  
40.00 kW  
400.0 kW  
4.000 MW  
40.00 MW  
Range  
1 W  
10 W  
100 W  
1 kW  
10 kW  
n Accuracy  
Maximum Error  
All ranges except 40 MW  
40 MW  
±(0.5% of reading + 2 counts)  
±(2% of reading + 5 counts) for  
60% relative humidity  
Bias Voltage for Full  
Scale Resistance  
Measurement, typical  
Range  
Full Scale Bias Voltage  
350 mV  
400.0 W  
4.000 kW  
40.00 kW  
400.0 kW  
4.000 MW  
40.00 MW  
200 mV  
350 mV  
350 mV  
400 mV  
1.10 V  
1–9  
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Specifications  
Table 1–2: DMM specifications (Cont.)  
W/Resistance  
Open Circuit Voltage, Range  
Open Circuit Voltage  
4.8 V  
typical  
400.0 W  
All other ranges  
1.2 V  
Continuity Check  
Indication  
An audible tone is generated when measured resistance is below 50 W,  
typical  
Open Circuit Voltage, 4 V  
typical  
Test Current, typical  
Diode Check  
Range  
1 mA  
Zero to 2 V, measures forward voltage drop of semiconductor junction  
Voltage Accuracy,  
typical  
±25%  
Open Circuit Voltage, 4 V  
typical  
Test Current, typical  
1 mA  
Data Logger  
Horizontal Scale  
Range  
30 s/div to 24 hours/div (4 minutes to 8 days, full scale)  
Vertical Zoom Range 2X, 5X, or 10X  
Table 1–3: General specifications  
Display  
Display Type  
4.7 in (120 mm) diagonal liquid crystal  
Display Resolution  
Display Contrast  
320 horizontal by 240 vertical pixels  
Adjustable, temperature compensated  
2
Backlight Intensity,  
typical  
35 cd/m  
1–10  
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Specifications  
Table 1–3: General specifications (Cont.)  
RS-232 Interface  
Device Type  
Pinout  
DTE. at RJ-45 connector  
Signal  
Pin Number at  
9-pin Null  
Pin Number at  
RJ-45  
Modem Adapter Connector  
RTS out  
1
2
3
5
6
7
8
4
7
8
6
5
4
3
7
8
2
1
TXD out  
RXD in  
GND  
DTR out  
CTS in  
RTS out  
DSR in (not used)  
DCD in (not used)  
Probe Compensator Output  
Output Voltage,  
typical  
5.0 V into 1 MW load  
Frequency, typical  
Power Source  
Battery  
1.2 kHz  
Replaceable Ni-Cd battery pack  
Battery Life, typical  
Approximately two hours of continuous use from a full charge  
Low Battery Indica-  
tion, typical  
Low battery message first appears approximately ten minutes before  
the instrument powers off automatically  
Battery Saver  
Standby Time-out and Backlight Time-out extend battery life. Time-out  
ranges from 1 minute to 15 minutes, or off.  
Battery Charging  
Time, typical  
With TekScope instrument operat- 9 hours  
ing  
With TekScope instrument turned 9 hours  
off  
In external charger  
1.5 hours  
External Power  
12 VDC nominal, center positive; Operates with input from 10 VDC to  
15 VDC  
The DC INPUT disconnects itself automatically if >15 VDC is applied.  
If this occurs, disconnect the overvoltage and then reconnect to a  
voltage in the proper range.  
Memory Retention,  
typical  
All memory is retained indefinitely with battery removed and without  
external power applied.  
Fuse  
This instrument has no user-replaceable fuses  
1–11  
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Specifications  
Table 1–3: General specifications (Cont.)  
Environmental  
Temperature  
Operating  
–10° C to +50° C  
–20° C to +60° C  
95% relative humidity  
75% relative humudity  
2,000 m  
Nonoperating  
+40° C or below  
+41° C to +50° C  
Operating  
Humidity  
Altitude  
Nonoperating  
Operating  
15,000 m  
Random Vibration  
2.66 g  
from 5 Hz to 500 Hz,  
RMS  
10 minutes on each axis  
Nonoperating  
3.48 g from 5 Hz to 500 Hz,  
10 minutes on each axis  
RMS  
Drop Resistance,  
typical  
Survives a 30 in (76 cm) drop onto concrete with only cosmetic damage  
Moisture Resistance  
Meets IEC529, IP43 with DC input hole plug, I/O port hole plug, and  
battery door installed.  
Mechanical  
Size  
Height  
8.53 in (217 mm)  
6.95 in (177 mm)  
2.00 in (50.8 mm)  
3.2 lbs (1.5 kg)  
7.5 lbs (3.4 kg)  
Width  
Depth  
Weight  
With battery installed  
With all standard accessories in  
soft carry case  
When packaged for domestic  
shipment  
9.0 lbs (4.1 kg)  
Adjustment Interval  
The recommended adjustment interval is one year  
1–12  
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Specifications  
Table 1–3: General specifications (Cont.)  
Certifications and Compliances  
Certifications  
Listed UL3111-1 and CAN/CSA-C22.2 No. 1010.1-92, complies with  
EN61010-1 /A2  
Overvoltage Category Category  
Examples  
CAT III  
A typical CAT III environment is  
the power distribution system  
within a building or factory. These  
environments are somewhat  
protected from lightning strikes,  
but susceptible to switching  
transients and other disturbances  
that may generate high voltage  
impulses.  
CAT II  
CAT I  
A typical CAT II environment is  
the 120/240 V distribution system  
within a lab or office. These  
environments are fairly well  
protected from external high  
voltage disturbances.  
A typical CAT II environment is  
circuitry inside electrical or elec-  
tronic equipment that is powered  
by a power supply or a battery.  
EC Declaration of  
Conformity  
Meets the intent of Directive 89/336/EEC for Electromagnetic  
Compatibility and Low-Voltage Directive 73/23/ECC for Product Safety  
as ammended by 93/68/EEC. Compliance was demonstrated to the  
following specifications as listed in the official Journal of the European  
Communities:  
1 3  
EN 55011 Class A:  
Radiated and Conducted Emissions  
EN 50081–1 Emissions:  
EN 60555–2  
Power Harmonics  
EN 50082–1 Immunity:  
IEC 801–2  
Electrostatic Discharge  
RF Radiated  
2
IEC 801–3  
IEC 801–4  
IEC 801–5  
Fast Transients  
Surge  
3
EN 61010–1 Safety  
1
Tektronix-supplied ferrite bead required on instrument end of  
RS-232 cable  
2
3
Performance criteria: 5.0 div increase in peak to peak noise  
(Sample acquisition mode, full bandwidth); otherwise, 1.0 div  
increase in peak to peak noise  
Applies to instrument operating with Tektronix-supplied AC  
adapter  
1–13  
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Specifications  
1–14  
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Operating Information  
This chapter provides a quick overview of the following topics:  
H
H
H
Internal and external power sources  
Understanding the front panel  
Connecting and using the probes  
For more detailed information about TekScope instrument operation, refer to the  
THS710A, THS720A, THS730A, & THS720P User Manual.  
For information about unpacking and inspecting the instrument, refer to  
Unpacking and Repacking Instructions on page 6–40 of this manual.  
Internal and External Power Sources  
You can power the TekScope instrument from the internal battery pack or from  
the AC adapter (both are standard accessories).  
Using the Battery Pack  
Before using the battery for the first time, it must be charged. You can use  
external power to charge the battery pack while it is in the TekScope instrument.  
Or you can charge the battery pack with the optional external battery charger.  
Typical battery charging times are listed below.  
Configuration  
Typical Charging Time  
9 hours  
Battery pack in TekScope instrument  
Battery pack in external charger  
1.5 hours  
You can remove and replace the battery pack without losing any saved  
information. The current setup, saved setups, saved waveforms, and saved data  
are stored in nonvolatile memory that does not depend on battery power. To  
prevent loss of saved information, set the ON/STBY switch to STBY before  
removing the battery pack. See Figure 2–1 for instruction to remove and replace  
the battery.  
WARNING. To avoid shock hazard, the battery door must remain closed in wet or  
damp conditions.  
2–1  
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Operator Information  
Battery pack  
Figure 2–1: Removing and replacing the battery  
Using External Power  
For benchtop operation, you can use external power. Attach the AC adapter  
as shown in Figure 2–2. The DC INPUT disconnects itself if an overvoltage is  
applied. If this occurs, disconnect and then reconnect the AC adapter to resume  
operation from external power.  
WARNING. To avoid shock hazard, the DC input and I/O port hole plugs must  
remain closed in wet or damp conditions.  
External power to  
DC INPUT  
Figure 2–2: AC adapter attachment  
2–2  
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Operator Information  
CAUTION. To avoid overheating, do not connect external power while the  
instrument is in a confined space, such as in the soft case.  
Understanding the Front Panel  
The SCOPE and METER buttons select the operating mode. The front panel has  
additional buttons for the functions you use most often and menus to access the  
more specialized functions.  
Using Scope Mode  
Press the front-panel SCOPE button to enter scope mode. Then, press AUTO-  
RANGE to set the vertical, horizontal, and trigger automatically for a usable  
display. A typical scope-mode display is shown in Figure 2–3.  
Status line  
Graticule  
area  
Measurement  
readout area  
Waveform readout lines  
Figure 2–3: Typical scope-mode display  
2–3  
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Operator Information  
Using Meter Mode  
Press the front-panel METER button to enter meter mode. Press one of the bezel  
buttons to choose a meter function and then press AUTORANGE to set the range  
automatically. A typical meter-mode display is shown in Figure 2–4.  
Status line  
Measurement  
readout areas  
Graticule area  
Figure 2–4: Typical meter-mode display  
2–4  
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Operator Information  
Using the Menu System  
To use the menu system, follow the steps below:  
1. Press a front-panel button to display the menu you want to use.  
2. Press a bezel button to choose a menu item. If a pop-up menu appears,  
continue to press the bezel button to choose an item in the pop-up menu. You  
may need to press the Select Page button to access additional menu items.  
2–5  
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Operator Information  
3. After choosing some menu items, you need to set a numerical parameter to  
complete the setup. Use the +/– rocker to adjust the parameter or press the  
TOGGLE button to reset the parameter to its default value.  
4. If the OK bezel button is displayed, press it to confirm your choice.  
NOTE. In the Performance Verification, Adjustments, and Maintenance chapters  
of this manual, TekScope instrument setups are shown in tables. Refer to  
Conventions on page x for information about reading these tables.  
2–6  
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Operator Information  
Using the Dedicated  
Buttons  
You can use the dedicated buttons below to take direct actions. These buttons do  
not require the use of menus.  
1
2
3
4
16  
15  
5
6
14  
13  
12  
11  
10  
9
8
7
1. HARD COPY. Initiates a hard copy using the RS-232 port.  
2. HOLD. Stops/restarts oscilloscope acquisition or holds/resets meter readout.  
3. AUTORANGE. Selects oscilloscope or meter autorange function.  
4. CLEAR MENU. Clears menu from display.  
5. TRIGGER LEVEL. Adjusts trigger level.  
6. SET LEVEL TO 50%. Sets trigger level to midpoint of oscilloscope  
waveform.  
7. HORIZONTAL POSITION. Adjusts oscilloscope waveform horizontal  
position.  
8. MAG. Turns 10X horizontal magnification on and off.  
9. SEC/DIV. Adjusts waveform horizontal scale factor for oscilloscope or data  
logger.  
10. VERTICAL POSITION. Adjusts oscilloscope waveform vertical position.  
11. WAVEFORM OFF. Removes selected oscilloscope waveform from display.  
12. VOLTS/DIV. Adjusts oscilloscope vertical scale factor or meter range.  
13. ON/STBY. Selects on or standby. Does not disconnect power from the  
instrument.  
2–7  
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Operator Information  
14. CH 1, CH 2, MATH, REF A, REF B. Displays waveform and chooses  
selected waveform. In harmonics mode (THS720P), CH 1 and CH 2 also  
display harmonics of voltage and current waveforms; MATH displays power  
measurements.  
15. SCOPE. Selects scope mode.  
16. METER. Selects meter mode.  
Connecting and Using the Probes  
The oscillscope probes and meter leads attach to the connectors located on the  
top and side panels of the TekScope instrument as shown in Figure 2–5.  
Top panel  
Side panel  
Figure 2–5: Connector locations  
2–8  
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Operator Information  
Compensating the  
Oscilloscope Probes  
To maintain signal fidelity, you must compensate each voltage probe for the  
channel input it is connected to.  
1. Connect the oscilloscope probe and then press AUTORANGE.  
Ch 1  
Probe reference lead to  
Probe tip to PROBE COMP  
AUTORANGE  
2. Check the shape of the displayed waveform.  
Overcompensated  
Undercompensated  
Compensated correctly  
3. If necessary, adjust the probe for correct compensation.  
P6117  
P5102  
4. Repeat these steps for the other probe and channel.  
2–9  
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Operator Information  
Attaching the Reference  
Leads Correctly  
If you are using both of the oscilloscope channels, you must attach the probe  
reference lead for each channel directly to your circuit. These attachments are  
required because the oscilloscope channels are electrically isolated; they do not  
share a common chassis connection. If you are also using the DMM, you must  
also attach the DMM common lead to your circuit for the same reason as above.  
Beware of High Voltages  
Understand the voltage ratings for the probes you are using and do not exceed  
those ratings. Two ratings are important to know and understand:  
H
The maximum measurement voltage from the probe tip to the probe  
reference lead  
H
The maximum floating voltage from the probe reference lead to earth ground  
These two voltage ratings depend on the probe and your application. Refer to  
Specifications beginning on page 1–1 for more information.  
WARNING. To prevent electrical shock, do not exceed the measurement or  
floating voltage ratings for the oscilloscope input BNC connector, probe tip,  
probe reference lead, DMM input connector, or DMM lead.  
2–10  
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Theory of Operation  
This chapter describes the electrical operation of the TekScope instrument to the  
module level. It describes the basic operation of each functional circuit block  
shown in Figure 3–1.  
Main Board  
The Main board assembly contains the following oscilloscope and meter  
functions.  
Oscilloscope Signal Path  
Each of the two oscilloscope input signals enters the main board and passes  
through an attenuator and buffer amplifier. Then each signal passes through an  
isolation interface before reaching the trigger circuitry, a sampler, and a digitizer.  
The digitized signals are written into system memory for transfer to the display  
system.  
Meter Signal Path  
Processor System  
The DMM input enters the Main board and passes through a switching network  
to select the meter function and range. The DMM signal is then sampled and  
digitized.  
The processor system contains a 68331 microprocessor that controls the entire  
instrument. The processor passes waveforms, meter readings, and text on to the  
display system. The processor system also contains flash ROM, system RAM,  
and the RS-232, keyboard, and probe compensation interfaces.  
Display System  
Power Supply  
The display system, consisting of a display controller and video memory,  
processes text and waveforms to refresh the display.  
The power supply provides DC power to ciruits on the main board and generates  
an AC voltage to provide power to the attenuators and buffer amplifiers across  
the isolation interfaces. It also provides +12 V and –20 V for the display module.  
Inverter Board  
The inverter board generates an AC voltage for the display backlight.  
3–1  
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Theory of Operation  
Display Module  
The display module consists of a liquid crystal display (LCD), a display driver,  
and a flourescent backlight.  
Switch Assembly  
The switch assembly is a matrix of switches that form the front-panel buttons.  
The switch assembly consists of a flex-circuit board and an elastomeric switch  
mat. Switch closures are read by the processor system.  
EXT  
PWR  
CH 1  
CH 2  
2
J8  
Main board  
2
Battery  
PROBE  
COMP  
J9  
Adjustment-  
lockout  
8
RS-232  
J5  
12  
J3  
COM  
DMM  
80  
Not used  
J1  
J7  
J6  
17  
5
Display assembly  
Inverterboard  
Switch assembly  
2
Figure 3–1: Module-level block diagram  
3–2  
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Performance Verification  
This chapter contains performance verification procedures for the specifications  
marked with the n symbol. The following equipment, or a suitable equivalent,  
is required to complete these procedures.  
Minimum  
Requirements  
Description  
Examples  
DC Voltage Source  
60 mV to 800 V, ±0.1% accu- Wavetek 9100 Universal  
racy  
Calibration System with Oscil-  
loscope Calibration Module  
(Option 250)  
AC Voltage Source  
Resistance Standard  
300 mV to 640 V, ±0.5%  
accuracy at 500 Hz  
Fluke 5500A Multi-product  
Calibrator with Oscilloscope  
Calibration Option (Option  
5500A-SC)  
360 W to 36 MW, ±0.1%  
accuracy  
Leveled Sine Wave Generator 50 kHz and 100 MHz, ±3%  
amplitude accuracy  
Time Mark Generator  
10 ms period, ±50 ppm accu-  
racy  
Banana to Banana Cable (two Shielded banana jacks on  
Tektronix Deluxe Meter Lead  
Set (ATLDX1)  
required)  
each end  
50 W BNC Cable  
BNC male to BNC male,  
36 in (1 m) long  
Tektronix part number  
012-0482-00  
50 W Feedthrough Termina-  
tion  
BNC male and female con-  
nectors  
Tektronix part number  
011-0049-01  
Dual Banana to BNC Adapter Banana plugs to BNC female Tektronix part number  
103-0090-00  
4–1  
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Performance Verification  
Test Record  
Serial  
Number  
Procedure Performed by  
Date  
Test  
Passed  
Failed  
Self Test  
Oscilloscope Tests  
Low Limit  
34.05 mV  
3.405 V  
Test Result  
High Limit  
35.95 mV  
3.595 V  
14.38 V  
71.9 V  
35.95 mV  
3.595 V  
14.38 V  
71.9 V  
Channel 1 DC Measure- 5 mV/div  
ment Accuracy  
500 mV/div  
2 V/div  
10 V/div  
13.62 V  
68.1 V  
Channel 2 DC Measure- 5 mV/div  
ment Accuracy  
34.05 mV  
3.405 V  
500 mV/div  
2 V/div  
10 V/div  
13.62 V  
68.1 V  
Channel 1 Bandwidth  
425 mV  
Channel 2 Bandwidth  
425 mV  
Sample Rate and Delay Time Accuracy  
Channel 1 Edge Trigger Sensitivity  
Channel 2 Edge Trigger Sensitivity  
–4 divs  
+4 divs  
Stable trigger  
Stable trigger  
4–2  
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Performance Verification  
DMM Tests  
Low Limit  
Test Result  
High Limit  
DC Voltage Accuracy  
400 mV range,  
60 mV input  
59.2 mV  
60.8 mV  
400 mV range,  
360 mV input  
357.7 mV  
362.3 mV  
4 V range  
3.577 V  
35.77 V  
357.7 V  
783 V  
3.623 V  
36.23 V  
362.3 V  
801 V  
40 V range  
400 V range  
880 V range  
400 mV range  
AC Voltage Accuracy  
352.3 mV  
0.583 V  
367.7 mV  
0.617 V  
4 V range,  
600 mV input  
4 V range,  
3.6 V input  
3.523 V  
3.677 V  
40 V range  
400 V range  
640 V range  
400 W range  
4 kW range  
35.23 V  
352.3 V  
559 V  
36.77 V  
367.7 V  
593 V  
Resistance Accuracy  
358.0 W  
3.580 kW  
5.95 kW  
362.0 W  
3.620 kW  
6.05 kW  
40 kW range,  
6 kW input  
40 kW range,  
35.80 kW  
36.20 kW  
36 kW input  
400 kW range  
4 MW range  
40 MW range  
358.0 kW  
3.580 MW  
35.23 MW  
362.0 kW  
3.620 MW  
36.77 MW  
4–3  
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Performance Verification  
Performance Verification Procedures  
In these procedures, TekScope instrument setups are shown in tables. Refer to  
Conventions on page x for information about how to use these tables.  
Before beginning these procedures, two conditions must first be met:  
H
H
The TekScope instrument must have been operating continuously for ten  
minutes within the operating temperature range specified.  
You must perform the Signal Path Compensation operation described below.  
If the ambient temperature changes by more than 5° C, you must perform the  
Signal Path Compensation operation again.  
The time required to complete the entire procedure is approximately one hour.  
WARNING. Some procedures use hazardous voltages. To prevent electrical shock,  
always set voltage source outputs to 0 V before making or changing any  
interconnections.  
Signal Path Compensation  
Signal path compensation optimizes the oscilloscope accuracy for the current  
ambient temperature. For maximum accuracy, recompensate the signal path if the  
ambient temperature changes by 5° C or more.  
To compensate the signal path, perform the following steps:  
1. Disconnect any probes or cables from the channel 1 and channel 2 input  
BNC connectors.  
2. Execute the signal path compensation with the following steps:  
System  
Cal  
SCOPE  
UTILITY  
Signal Path  
OK Compensate Signal  
Paths  
3. When the signal path compensation is complete, press CLEAR MENU to  
resume operation of the TekScope instrument.  
4–4  
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Performance Verification  
Execute Self Test  
This procedure uses internal routines to verify that the TekScope instrument  
functions and passes its internal self tests. No test equipment or hookups are  
required. Start the self test with the following setup:  
System  
Diag  
Once  
SCOPE  
UTILITY  
Loop  
Execute  
OK Run Test  
A dialog box displays the result when the self test completes. Press the CLEAR  
MENU button to continue operation.  
4–5  
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Performance Verification  
Check Oscilloscope DC  
Measurement Accuracy  
This test checks the DC measurement accuracy of the oscilloscope.  
1. Set the DC voltage source output level to 0 V.  
2. Set up the TekScope instrument using the following steps:  
Recall Saved  
Setup  
Recall Factory  
Setup  
SCOPE  
SAVE/  
RECALL  
OK Recall  
Factory  
CH 1  
VERTICAL  
MENU  
Probe Type  
Voltage Probe  
Set to 1X  
ACQUIRE  
MEAS  
Mode  
Average  
Mean*  
Set to 16  
Select Measrmnt  
OK Select  
Measrmnt  
*
You may need to press Select Page to display this selection.  
3. Connect the TekScope instrument to the DC voltage source as shown below.  
DC voltage  
source  
Ch 1  
+
Dual banana  
to bnc adapter  
BNC cable  
4–6  
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Performance Verification  
4. For each VOLTS/DIV setting listed below, perform the following steps:  
a. Set the DC voltage source output level to the positive voltage listed and  
then record the mean measurement as Vpos  
.
b. Reverse the polarity of the DC voltage source and then record the mean  
measurement as Vneg  
.
c. Calculate Vdiff = Vpos – Vneg and then compare Vdiff to the accuracy  
limits in the table.  
DC Voltage Source Output  
Levels  
VOLTS/DIV Setting  
5 mV/div  
Accuracy Limits for V  
34.05 mV to 35.95 mV  
3.405 V to 3.595 V  
13.62 V to 14.38 V  
68.1 V to 71.9 V  
diff  
+17.5 mV, –17.5 mV  
+1.75 V, –1.75 V  
+7.00 V, –7.00 V  
+35.0 V, –35.0 V  
500 mV/div  
2 V/div  
10 V/div  
5. Set DC voltage source output level to 0 V.  
6. To check channel 2, repeat step 2 substituting CH 2 for CH 1.  
7. Press CH 1 and WAVEFORM OFF to remove the channel 1 waveform  
from the display.  
8. Repeat steps 3 through 5, substituting CH 2 for CH 1, to complete the check  
of channel 2.  
4–7  
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Performance Verification  
Check Oscilloscope  
Channel 1 Bandwidth  
This test checks the bandwidth of channel 1.  
1. Set up the TekScope instrument using the following steps:  
Recall Saved  
Setup  
Recall Factory  
Setup  
SCOPE  
SAVE/  
RECALL  
OK Recall  
Factory  
ACQUIRE  
TRIGGER  
MEAS  
Mode  
Average  
Set to 16  
Coupling  
Noise Reject  
Gating & High-Low High-Low Method  
Setup  
Min/Max  
Select Measrmnt  
Pk-Pk*  
OK Select  
Measrmnt  
*
You may need to press Select Page to display this selection.  
2. Connect the TekScope instrument to the leveled sine wave generator as  
shown below.  
Leveled  
sine wave  
generator  
50 W feedthrough  
terminator  
Ch 1  
Output  
BNC cable  
4–8  
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Performance Verification  
3. Set the TekScope instrument VOLTS/DIV to 100 mV/div.  
4. Set the TekScope instrument SEC/DIV to 10 ms/div.  
5. Set the leveled sine wave generator frequency to 50 kHz.  
6. Set the leveled sine wave generator output level so the peak-to-peak  
measurement is between 599 mV and 601 mV.  
7. Set the leveled sine wave generator frequency to 200 MHz if you are  
checking a THS730A, 100 MHz if you are checking a THS720A or a  
THS720P, or 60 MHz if you are checking a THS710A.  
8. Press MAG.  
9. Set the TekScope instrument SEC/DIV to 10 ns/div.  
10. Check that the peak-to-peak measurement is 425 mV.  
11. Press MAG.  
12. Proceed to the next test to check the channel 2 bandwidth.  
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Performance Verification  
Check Oscilloscope  
Channel 2 Bandwidth  
This test checks the bandwidth of channel 2.  
1. First check the channel 1 bandwidth using the previous test. Then, perform  
these additional steps to check the channel 2 bandwidth:  
CH 1  
SCOPE  
WAVEFORM  
OFF  
CH 2  
TRIGGER  
MEAS  
Trigger Source  
Ch2  
Gating & High-Low High-Low Method  
Setup  
Min/Max  
Select Measrmnt  
Pk-Pk*  
OK Select  
Measrmnt  
*
You may need to press Select Page to display this selection.  
2. Connect the TekScope instrument to the leveled sine wave generator as  
shown below.  
Leveled  
sine wave  
generator  
50 W feedthrough  
terminator  
Ch 2  
Output  
BNC cable  
4–10  
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Performance Verification  
3. Set the TekScope instrument VOLTS/DIV to 100 mV/div.  
4. Set the TekScope instrument SEC/DIV to 10 ms/div.  
5. Set the leveled sine wave generator frequency to 50 kHz.  
6. Set the leveled sine wave generator output level so the peak-to-peak  
measurement is between 599 mV and 601 mV.  
7. Set the leveled sine wave generator frequency to 200 MHz if you are  
checking a THS730A, 100 MHz if you are checking a THS720A or a  
THS720P, or 60 MHz if you are checking a THS710A.  
8. Press MAG.  
9. Set the TekScope instrument SEC/DIV to 10 ns/div.  
10. Check that the peak-to-peak measurement is 425 mV.  
4–11  
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Performance Verification  
Check Oscilloscope  
Sample Rate and Delay  
Time Accuracy  
This test checks the oscilloscope time base accuracy.  
1. Set up the TekScope instrument using the following steps:  
Recall Saved  
Setup  
Recall Factory  
Setup  
SCOPE  
SAVE/  
RECALL  
OK Recall  
Factory  
VERTICAL  
MENU  
Probe Type  
Voltage Probe  
Set to 1X  
2. Connect the TekScope instrument to the time mark generator as shown  
below.  
Time mark  
generator  
50 W feedthrough  
terminator  
Ch 1  
Output  
BNC cable  
3. Set the time mark generator period to 10 ms.  
4. Set the TekScope instrument VOLTS/DIV to 500 mV/div.  
5. Use the vertical POSITION rocker to center the test signal on screen.  
4–12  
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Performance Verification  
6. Press SET LEVEL TO 50%.  
7. Press MAG.  
8. Change the TekScope instrument setup using the following steps:  
HORIZON-  
TAL MENU  
Time Base  
Delayed Runs After  
Main  
SCOPE  
CLEAR  
MENU  
9. Set the delayed time base SEC/DIV to 50 ms/div.  
10. Change the TekScope instrument setup using the following steps:  
HORIZON-  
TAL MENU  
Time Base  
Delayed Runs After Set delay time to  
SCOPE  
Main  
10 ms  
CLEAR  
MENU  
11. Set the delayed time base SEC/DIV to 500 ns/div.  
12. Check that the rising edge of the marker crosses the center horizontal  
graticule line within ±4 divisions of center graticule.  
NOTE. One division of displacement from graticule center corresponds to  
a 50 ppm time base error.  
4–13  
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Performance Verification  
Check Oscilloscope  
Channel 1 Edge Trigger  
Sensitivity  
This test checks the edge trigger sensitivity for channel 1.  
1. Set up the TekScope instrument using the following steps:  
Recall Saved  
Setup  
Recall Factory  
Setup  
SCOPE  
SAVE/  
RECALL  
OK Recall  
Factory  
ACQUIRE  
TRIGGER  
MEAS  
Mode  
Mode  
Average  
Normal  
Set to 16  
Gating & High-Low High-Low Method  
Setup  
Min/Max  
Select Measrmnt  
Ampl*  
OK Select  
Measrmnt  
*
You may need to press Select Page to display this selection.  
2. Connect the TekScope instrument to the leveled sine wave generator as  
shown below.  
Leveled  
sine wave  
generator  
50 W feedthrough  
terminator  
Ch 1  
Output  
BNC cable  
4–14  
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Performance Verification  
3. Set the leveled sine wave generator frequency to 200 MHz if you are  
checking a THS730A or to 100 MHz if you are checking a THS710A,  
THS720A or THS720P.  
4. Set the TekScope instrument VOLTS/DIV to 500 mV/div.  
5. Press MAG.  
6. Set the TekScope instrument SEC/DIV to 10 ns/div.  
7. Set the leveled sine wave generator output level to approximately 50 mVp-p  
so that the measured amplitude is approximately 500 mV. (The measured  
amplitude can fluctuate around 500 mV.)  
8. Press SET LEVEL TO 50%. Adjust TRIGGER LEVEL as necessary and  
then check that triggering is stable.  
9. Change the TekScope instrument setup using the following steps:  
SCOPE  
TRIGGER  
Slope  
\ (falling edge)  
10. Press SET LEVEL TO 50%. Adjust TRIGGER LEVEL as necessary and  
then check that triggering is stable.  
11. Change the TekScope instrument setup using the following steps:  
SCOPE  
TRIGGER  
Slope  
/ (rising edge)  
12. Proceed to the next test to check the channel 2 edge trigger sensitivity.  
4–15  
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Performance Verification  
Check Oscilloscope  
Channel 2 Edge Trigger  
Sensitivity  
This test checks the edge trigger sensitivity for channel 2.  
1. First check the channel 1 edge trigger sensitivity using the previous test.  
Then, perform these additional steps to check the channel 2 edge trigger  
sensitivity:  
CH 1  
SCOPE  
WAVEFORM  
OFF  
CH 2  
TRIGGER  
MEAS  
Trigger Source  
Ch2  
Gating & High-Low High-Low Method  
Setup  
Min/Max  
Select Measrmnt  
Ampl*  
OK Select  
Measrmnt  
*
You may need to press Select Page to display this selection.  
2. Connect the TekScope instrument to the leveled sine wave generator as  
shown below.  
Leveled  
sine wave  
generator  
50 W feedthrough  
terminator  
Ch 2  
Output  
BNC cable  
4–16  
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Performance Verification  
3. Set the leveled sine wave generator frequency to 200 MHz if you are  
checking a THS730A or to 100 MHz if you are checking a THS710A,  
THS720A or THS720P.  
4. Set the TekScope instrument VOLTS/DIV to 500 mV/div.  
5. Set the leveled sine wave generator output level to approximately 50 mVp-p  
so that the measured amplitude is approximately 500 mV. (The measured  
amplitude can fluctuate around 500 mV.)  
6. Press SET LEVEL TO 50%. Adjust TRIGGER LEVEL as necessary and  
then check that triggering is stable.  
7. Change the TekScope instrument setup using the following steps:  
SCOPE  
TRIGGER  
Slope  
\ (falling edge)  
8. Press SET LEVEL TO 50%. Adjust TRIGGER LEVEL as necessary and  
then check that triggering is stable.  
4–17  
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Performance Verification  
Check Meter DC Voltage  
Accuracy  
This test checks the meter DC voltage accuracy.  
1. Set the DC voltage source output level to 0 V.  
2. Set up the TekScope instrument using the following steps:  
METER  
VDC  
3. Connect the TekScope instrument to the DC voltage source as shown below.  
DC voltage  
source  
+
Banana cables  
4–18  
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Performance Verification  
4. For each range, set the DC voltage source output to the level listed below,  
and then compare the meter reading to the accuracy limits.  
DC Voltage Source  
Output Level  
60 mV  
360 mV  
3.6 V  
Range  
400 mV  
400 mV  
4 V  
Accuracy Limits  
59.2 mV to 60.8 mV  
357.7 mV to 362.3 mV  
3.577 V to 3.623 V  
35.77 V to 36.23 V  
357.7 V to 362.3 V  
783 V to 801 V  
40 V  
36 V  
400 V  
880 V  
360 V  
792 V  
5. Set the DC voltage source output level to 0 V.  
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Performance Verification  
Check Meter AC Voltage  
Accuracy  
This test checks the meter AC voltage accuracy.  
1. Set the AC voltage source output level to 0 V.  
2. Set up the TekScope instrument using the following steps:  
METER  
VAC  
3. Connect the TekScope instrument to the AC voltage source as shown below.  
AC voltage  
source  
Banana cables  
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Performance Verification  
4. Set the AC voltage source output frequency to 500 Hz.  
5. For each range, set the AC voltage source output to the level listed below,  
and then compare the meter reading to the accuracy limits.  
AC Voltage Source  
Output Level  
360 mV  
600 mV  
3.6 V  
Range  
400 mV  
4 V  
Accuracy Limits  
352.3 mV to 367.7 mV  
0.583 V to 0.617 V  
3.523 V to 3.677 V  
35.23 V to 36.77 V  
352.3 V to 367.7 V  
559 V to 593 V  
4 V  
40 V  
36 V  
400 V  
640 V  
360 V  
576 V  
6. Set the AC voltage source output level to 0 V.  
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Performance Verification  
Check Meter Resistance  
Accuracy  
This test checks the meter resistance measurement accuracy.  
1. Set up the TekScope instrument using the following steps:  
METER  
W
2. Connect the TekScope instrument to the resistance standard as shown below.  
Resistance  
standard  
Banana cables  
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Performance Verification  
3. For each range, set the resistance standard to the resistance listed below, and  
then compare the meter reading to the accuracy limits.  
Resistance Standard  
Setting  
360 W  
3.6 kW  
6 kW  
Range  
400 W  
4 kW  
Accuracy Limits  
358.0 W to 362.0 W  
3.580 kW to 3.620 kW  
5.95 kW to 6.05 kW  
35.80 kW to 36.20 kW  
358.0 kW to 362.0 kW  
3.580 MW to 3.620 MW  
35.23 MW to 36.77 MW  
40 kW  
40 kW  
400 kW  
4 MW  
36 kW  
360 kW  
3.6 MW  
36 MW*  
40 MW*  
*
These limits apply only when the relative humidity is 60%.  
This completes the performance verification procedure.  
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Adjustment Procedures  
This chapter contains adjustment procedures for the TekScope instrument.  
Only qualified personnel should perform service procedures. Read this Service  
Safety Summary and the General Safety Summary before performing any service  
procedures. Also refer to the chapter Operating Information for information  
about using the TekScope instrument.  
NOTE. The voltage references inside the TekScope instrument are very stable over  
time and should not require routine adjustment. Before performing any proce-  
dure in this chapter, first verify that the instrument does not meet specifications.  
Refer to the chapter Performance Verification for procedures to verify the  
specifications.  
Required Equipment  
The following equipment, or a suitable equivalent, is required to complete these  
procedures.  
Minimum  
Requirements  
Description  
Examples  
DC Voltage Source  
400 mV to 800 V, ±0.1%  
Wavetek 9100 Universal  
Calibration System with Oscil-  
loscope Calibration Module  
(Option 250)  
accuracy  
AC Voltage Source  
Resistance Standard  
400 mV to 600 V, ±0.5%  
accuracy at 500 Hz  
Fluke 5500A Multi-product  
Calibrator with Oscilloscope  
Calibration Option (Option  
5500A-SC)  
100 W to 10 MW, ±0.1%  
accuracy  
Fast-Rise Square Wave  
Generator  
300 mV step, 20 ns risetime,  
0.5% flattness from 500 ns  
to 200 ms, 500 Hz or 950 Hz,  
nominal 50% duty cycle  
Banana to Banana Cable (two Shielded banana jacks on  
Tektronix Deluxe Meter Lead  
Set (ATLDX1)  
required)  
each end  
50 W BNC Cable  
BNC male to BNC male,  
36 in (1 m) long  
Tektronix part number  
012-0482-00  
50 W BNC Cable  
BNC male to BNC male,  
10 in (25 cm) long  
Tektronix part number  
012-0208-00  
50 W Feedthrough  
Termination  
BNC male and female con-  
nectors  
Tektronix part number  
011-0049-01  
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Adjustment Procedures  
Minimum  
Requirements  
Description  
Examples  
Dual Banana to BNC Adapter Banana plugs to BNC female Tektronix part number  
103-0090-XX  
BNC T  
One male and two female  
BNC connectors  
Tektronix part number  
103-0030-XX  
Overview of the Adjustment Process  
The TekScope instrument is protected from inadvertent adjustment by an internal  
adjustment-lockout jumper. Some disassembly is required to access and remove  
the jumper before you can adjust the instrument. After adjustment is complete,  
the jumper should be replaced to protect the calibration of the instrument.  
Oscilloscope adjustment and meter adjustment are independent procedures. You  
can choose to adjust either or both. Each procedure consists of a series of steps;  
as you move through these steps, the TekScope instrument display provides  
instructions that describe the specific input signal requirements for each step.  
NOTE. During some steps, the instrument may appear to be idle for several  
minutes while it is processing information internally. Please have patience.  
If all steps in the procedure are completed successfully, a “Pass” message is  
displayed and the new calibration constants take affect. If any step fails, the  
procedure is aborted and the current calibration is not affected. You can also  
choose to abort the procedure at any step.  
Before performing adjustment procedures, you must warm up the instrument at  
least ten minutes in an ambient temperature between 20° C and 30° C. Adjust-  
ments performed prior to warm-up or outside this temperature range may result  
in poor performance.  
In this manual, TekScope instrument setups are shown in tables. Refer to  
Conventions on page x for information about how to use these tables.  
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Adjustment Procedures  
Accessing the Adjustment-Lockout Jumper  
Before adjusting the instrument you must (temporarily) remove the internal  
adjustment-lockout jumper. You will need a 12 in lb (1.3 N m) torque-limiting  
screwdriver with Torx T-15 tip and a pair of needle-nose pliers to access and  
remove the jumper.  
WARNING. Before doing this or any other procedure in this manual, read the  
General Safety Summary and Service Safety Summary found at the beginning of  
this manual. Also, to prevent possible injury to service personnel or damage to  
electrical components, read Preventing ESD on page 6–1.  
Use this procedure to access and remove the adjustment-lockout jumper.  
1. Disconnect all probes, cables, or meter leads from the instrument.  
2. Disconnect the AC adapter, open the battery door, and remove the battery.  
3. Place the TekScope instrument face down on a soft surface (such as an  
anti-static mat).  
4. Use the torque-limiting Torx T-15 screwdriver to remove the four screws  
that hold the case together.  
5. Holding the case together, pick it up and place it back side down on a soft  
surface.  
6. As you lift the front cover off the instrument, press the buttons as necessary  
to prevent the switch mat from coming off with the front cover.  
7. To remove the switch mat, lift it off the switch flex-circuit assembly. Place it  
button-side down on a clean surface.  
CAUTION. To avoid contamination of switch contacts, do not touch the carbon  
contacts on the switch flex-circuit assembly or on the back side of the switch  
mat.  
8. Fold the switch flex-circuit assembly toward you to expose the display  
module, inverter board, and adjustment-lockout jumper. The jumper location  
is shown in Figure 5–1.  
9. Use the needle nose pliers to remove the adjustment-lockout jumper from the  
instrument. Set the jumper aside for replacement after the adjustment is  
complete.  
10. To reassemble the instrument, fold the switch flex-circuit assembly back  
over the display module and inverter board.  
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Adjustment Procedures  
Adjustment-lockout  
jumper  
Figure 5–1: Location of adjustment-lockout jumper  
11. To install the switch mat, place it (contact side down) on the switch  
flex-circuit assembly. The five rubber guideposts fit into holes in the circuit  
board.  
12. Place the front cover assembly onto the instrument. Taking care not to pinch  
the handle, align it into the guides in the front cover. Align the buttons so  
they all protrude through the holes in the front cover.  
13. Holding the case together, pick it up and place it front side down on a soft  
surface.  
CAUTION. To avoid cross-threading or cutting new threads with the screws,  
carefully follow the procedure in the next step.  
14. To install the four screws, follow these steps:  
a. Place the screws into their holes in the back cover.  
b. Using the torque-limiting Torx T-15 screwdriver, slowly turn each  
screw backward (counterclockwise) until you feel the thread drop and  
then gently tighten the screw (turn clockwise) into the existing thread.  
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Adjustment Procedures  
c. When all four all screws are in, hold a corner of the case together firmly  
to compress the gasket while tightening its screw until snug. Repeat for  
the other corners. Do not overtighten the screws (14 in lbs or 1.5 N m  
maximum torque).  
15. Replace the battery as shown on page 2–2, and then close the battery door.  
Oscilloscope Adjustment  
Three equipment setups, shown in Figure 5–2, are required to complete this  
adjustment procedure. For each step in the procedure, the specific input signal  
required by that step is described in the TekScope instrument display. Refer to  
these diagrams as necessary during the procedure. Table 5–1 summarizes the  
steps in the procedure and the signal requirement for each step.  
Table 5–1: Summary of oscilloscope adjustment steps  
Step  
Uses Equipment Setup  
Signal Source Setting  
1
Square wave generator setup  
Fast rise output, 300 mV amplitude,  
500 Hz or 950 Hz frequency  
p-p  
2
Zero voltage setup  
DC voltage setup  
DC voltage setup  
DC voltage setup  
DC voltage setup  
DC voltage setup  
DC voltage setup  
None  
5
+7.000 V  
6
–7.000 V  
7
+700.0 mV  
–700.0 mV  
+70.00 mV  
–70.00 mV  
8
9
10  
5–5  
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Adjustment Procedures  
Square wave generator setup  
10 inch BNC cable  
50 W feedthrough  
terminator  
BNC ‘T’ connector  
Ch 1  
Fast rise square  
wave generator  
Ch 2  
Output  
36 inch BNC cable  
Zero voltage setup  
10 inch BNC cable  
50 W feedthrough  
terminator  
BNC ‘T’ connector  
Ch 1  
Ch 2  
DC voltage setup  
10 inch BNC cable  
DC voltage  
source  
BNC ‘T’ connector  
Ch 1  
Ch 2  
+
Dual banana  
to bnc adapter  
36 inch BNC cable  
Figure 5–2: Oscilloscope adjustment setups  
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Adjustment Procedures  
Oscilloscope Adjustment  
Procedure  
After removing the adjustment-lockout jumper, use this procedure to adjust the  
oscilloscope voltage references.  
1. Turn on the TekScope instrument and let it warm up for at least ten minutes.  
2. Connect the fast rise square wave generator to the instrument as shown in the  
Square wave generator setup of Figure 5–2.  
3. Set the fast rise square wave generator to produce an amplitude between  
250 mVp-p and 300 mVp-p, and frequency between 450 Hz and 950 Hz  
(inclusive).  
4. Use the TekScope instrument setup below to start the oscilloscope adjust-  
ment process. For each step, follow the specific instructions displayed by the  
instrument to connect the correct signal source and then confirm that you are  
ready to proceed to the next step.  
System  
Cal  
SCOPE  
UTILITY  
Factory Scope  
OK Factory Cal Scope  
NOTE. During some steps, the instrument may appear to be idle for several  
minutes while it is processing information internally. Please have patience.  
If any step in the procedure fails, the procedure terminates. Failure will result if  
an incorrect signal source is connected. If this happens, you must start the  
procedure over from the beginning.  
If the procedure completes successfully, a “Pass” message is displayed and the  
new adjustment takes effect.  
Completing the  
After adjusting the oscilloscope, continue with one of the following steps:  
Adjustment Process  
H
H
Proceed to Meter Adjustment on page 5–8 to adjust the meter voltage  
references.  
Proceed to Replacing the Adjustment-Lockout Jumper on page 5–11 to  
protect the instrument from inadvertent readjustment.  
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Adjustment Procedures  
Meter Adjustment  
Three equipment setups, shown in Figure 5–3, are required to complete this  
adjustment procedure. For each step in the procedure, the specific input signal  
required by that step is described in the TekScope instrument display. Refer to  
these diagrams as necessary during the procedure. Table 5–2 summarizes the  
steps in the procedure and the signal requirement for each step.  
Table 5–2: Summary of meter adjustment steps  
Step  
1
Uses Equipment Setup  
DC voltage setup  
Signal or Resistance Source Setting  
+400.0 mV  
4.000 V  
40.00 V  
400.0 V  
850.0 V  
2
DC voltage setup  
3
DC voltage setup  
4
DC voltage setup  
5
DC voltage setup  
6
AC voltage setup  
400.0 mV , 500 Hz  
RMS  
7
AC voltage setup  
4.000 V , 500 Hz  
RMS  
8
AC voltage setup  
40.00 V , 500 Hz  
RMS  
9
AC voltage setup  
400.0 V , 500 Hz  
RMS  
10  
11  
12  
13  
14  
15  
16  
17  
AC voltage setup  
600.0 V , 500 Hz  
RMS  
Resistance standard setup  
Resistance standard setup  
Resistance standard setup  
Resistance standard setup  
Resistance standard setup  
Resistance standard setup  
100.0 W  
1.000 kW  
10.00 kW  
100.0 kW  
1.000 MW  
10.00 MW  
500.0 mV  
1.000 V  
1
DC voltage setup  
1
18  
DC voltage setup  
1
In steps 17 and 18, the DC voltage source must be able to sink approximately 1 mA  
supplied by the TekScope instrument. You must determine whether or not your DC  
voltage source is capable of sinking current supplied by a device under test. If the  
1
DC voltage source cannot sink current, you can connect a 470 W, ? W shunt  
8
resistor across the output of the DC voltage source during steps 17 and 18 only. The  
shunt resistor will accommodate the current supplied by the TekScope instrument.  
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Adjustment Procedures  
DC voltage setup  
DC voltage  
source  
+
Banana cables  
AC voltage setup  
AC voltage  
source  
Banana cables  
Resistance standard setup  
Resistance  
standard  
Banana cables  
Figure 5–3: Meter adjustment setups  
5–9  
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Adjustment Procedures  
Meter Adjustment  
After removing the adjustment-lockout jumper, use this procedure to adjust the  
meter voltage references.  
Procedure  
1. Turn on the TekScope instrument and let it warm up for at least ten minutes.  
2. Connect the DC voltage source to the instrument as shown in the DC voltage  
setup of Figure 5–3.  
3. Set the DC voltage source amplitude to 400 mV.  
4. Use the TekScope instrument setup below to start the meter adjustment  
process. For each step, follow the specific instructions displayed by the  
instrument to connect the correct signal source and confirm that you are  
ready to proceed to the next step.  
System  
Cal  
METER  
UTILITY  
Factory DMM  
OK Factory Cal DMM  
If any step in the procedure fails, the procedure terminates. Failure will result if  
an incorrect signal source is connected. If this happens, you must start the  
procedure over from the beginning.  
If the procedure completes successfully, a “Pass” message is displayed and the  
new adjustment takes effect.  
Completing the  
After adjusting the meter, continue with one of the following steps:  
Adjustment Process  
H
H
Return to Oscilloscope Adjustment on page 5–5 to adjust the oscilloscope  
voltage references.  
Proceed to Replacing the Adjustment-Lockout Jumper on page 5–11 to  
protect the instrument from inadvertent readjustment.  
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Adjustment Procedures  
Replacing the Adjustment-Lockout Jumper  
After you complete the adjustment process, you should reinstall the adjustment-  
lockout jumper to prevent inadvertent loss of calibrration. To replace the jumper,  
repeat the procedure Accessing the Adjustment-Lockout Jumper on page 5–3.  
However, in place of step 9, reinstall the jumper onto pins 1 and 2 as shown in  
Figure 5–4.  
Adjustment-lockout  
jumper position  
Figure 5–4: Relocating the adjustment-lockout jumper  
This completes the adjustment procedure.  
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Adjustment Procedures  
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Maintenance  
This chapter contains the information needed to do periodic and corrective  
maintenance on the TekScope instrument. The following sections are included:  
H
H
H
H
Preparation refers you to important information contained elsewhere in this  
manual.  
Preventing ESD provides general information on preventing damage to  
internal modules when doing maintenance.  
Inspection and Cleaning provides procedures for inspecting the TekScope  
instrument and cleaning its external and internal modules.  
Removal and Installation Procedures provide procedures for the removal and  
installation of modules.  
H
H
Troubleshooting provides information for isolating failed modules.  
Unpacking and Repacking Instructions provides packaging information for  
shipment or storage.  
Preparation  
Only qualified personnel should perform service procedures. Read the Service  
Safety Summary and the General Safety Summary before performing any service  
procedures. Also refer to the chapter Operating Information for information  
about using the TekScope instrument.  
Preventing ESD  
When performing any service which requires internal access to the TekScope  
instrument, adhere to the following precautions to avoid damaging internal  
modules and their components due to electrostatic discharge (ESD).  
CAUTION. Static discharge can damage any semiconductor component in this  
instrument.  
1. Minimize handling of static-sensitive modules.  
2. Transport and store static-sensitive modules in their static protected  
containers or on a metal rail. Label any package that contains static-sensitive  
modules.  
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Maintenance  
3. Discharge the static voltage from your body by wearing a grounded antistatic  
wrist strap while handling these modules. Do service of static-sensitive  
modules only at a static-free work station.  
4. Nothing capable of generating or holding a static charge should be allowed  
on the work station surface.  
5. Handle circuit boards by the edges when possible.  
6. Do not slide the modules over any surface.  
7. Avoid handling modules in areas that have a floor or work-surface covering  
capable of generating a static charge.  
Inspection and Cleaning  
This section describes how to inspect for dirt and damage, and how to clean the  
TekScope instrument. Inspection and cleaning are done as preventive mainte-  
nance. Preventive maintenance, when done regularly, may prevent malfunctions  
and enhance reliability.  
Preventive maintenance consists of visually inspecting and cleaning the  
TekScope instrument, and using general care when operating it. How often to do  
maintenance depends on the severity of the environment in which the instrument  
is used. A proper time to perform preventive maintenance is just before  
adjustment of the instrument.  
General Care  
Protect the TekScope instrument from adverse weather conditions. The instru-  
ment is not waterproof.  
Do not store or leave the instrument where the LCD display will be exposed to  
direct sunlight for long periods of time.  
The front and back covers help keep dust out of the TekScope instrument and  
must be in place during normal operation.  
CAUTION. To avoid damage to the TekScope instrument, do not expose it to any  
sprays, liquids, or solvents.  
Inspection and Cleaning  
Procedures  
Inspect and clean the TekScope instrument as often as operating conditions  
require. The collection of dirt on internal components can cause them to overheat  
and breakdown. Dirt acts as an insulating blanket, preventing efficient heat  
dissipation. Dirt also provides an electrical conduction path that could cause an  
instrument failure, especially under high-humidity conditions.  
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Maintenance  
Inspection — Exterior. Inspect the outside of the TekScope instrument for  
damage, wear, and missing parts. Instruments that appear to have been dropped  
or otherwise abused should be checked thoroughly to verify correct operation  
and performance. Immediately repair defects that could cause personal injury or  
lead to further damage to the instrument.  
Cleaning Procedure — Exterior. To clean the TekScope instrument exterior,  
perform the following steps:  
1. Remove loose dust on the outside of the instrument with a lint free cloth.  
Use care to avoid scratching the clear plastic display filter.  
2. Use a soft cloth or paper towel dampened with water to clean the instrument.  
You can use a 75% isopropyl alcohol solution for more efficient cleaning.  
CAUTION. To avoid damage to the surface of the TekScope instrument, do not use  
any abrasive or chemical cleaning agents.  
Inspection — Interior. During normal use, the TekScope instrument case seals the  
internal components against common dust and dirt. However, if it appears that  
the instrument may have been damaged or has been exposed to an unusually  
dirty or wet environment, you should inspect and clean the interior.  
To inspect and clean the interior, disassemble the instrument according to the  
procedure Complete Disassembly on page 6–23.  
Inspect the internal portions of the instrument for damage and wear using  
Table 6–1 as a guide. Defects found should be repaired immediately.  
Table 6–1: Internal inspection check list  
Item  
Inspect For  
Repair Action  
Front and Back  
Cover  
Cracks or deformations. Scratched Repair or replace defective hard-  
lettering or display filter. Loose  
connectors or labels.  
ware.  
Hole Plugs, Gasket  
and Foam Pads  
Misplaced or missing pieces.  
Relocate or replace defective  
pieces.  
Circuit boards  
Loose, broken, or corroded solder Remove failed module and replace  
connections. Burned circuit  
boards. Burned, broken, or  
cracked circuit-run plating.  
with a new module.  
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Maintenance  
Table 6–1: Internal inspection check list (Cont.)  
Item  
Inspect For  
Repair Action  
Solder connections  
Cold solder or rosin joints.  
Resolder joint and clean with  
isopropyl alcohol.  
Wiring and cables  
Loose plugs or connectors.  
Burned, broken, or frayed wiring.  
Firmly seat connectors. Repair or  
replace modules with defective  
wires or cables.  
Cleaning Procedure — Interior. To clean the TekScope instrument interior,  
perform the following steps:  
1. Blow off dust with dry, low-pressure, deionized air (approximately 9 psi).  
2. Remove any remaining dust with a lint-free cloth dampened in isopropyl  
alcohol (75% solution) and rinse with warm deionized water. (A cotton-  
tipped applicator is useful for cleaning in narrow spaces and on circuit  
boards.)  
STOP. If, after performing steps 1 and 2, a module is clean upon inspection, skip  
steps 3 and 4. Proceed with step 5.  
If steps 1 and 2 do not remove all the dust or dirt, all modules in the instrument  
except the Display Module may be spray washed using a solution of 75%  
isopropyl alcohol. Proceed with step 3.  
3. Spray wash dirty parts with the 75% isopropyl alcohol solution and wait  
60 seconds for the majority of the alcohol to evaporate.  
4. Use hot (49_ C to 60_ C / 120_ F to 140_ F) deionized water to thoroughly  
rinse the parts.  
5. Dry all parts with low-pressure, deionized air.  
6. Dry all components and assemblies in an oven or drying compartment using  
low-temperature (52_ C to 66_ C / 125_ F to 150_ F) circulating air.  
Lubrication. There is no periodic lubrication required for the TekScope instru-  
ment.  
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Maintenance  
Removal and Installation Procedures  
This section describes how to remove and install the major mechanical and  
electrical modules. It provides the following information:  
H
H
H
H
List of Modules on page 6–5 describes where to locate a list of replaceable  
modules.  
Summary of Procedures on page 6–6 lists the procedures for removal and  
installation of modules.  
Tools Required on page 6–7 describes the tools needed to perform the  
procedures.  
Tilt Stand, on page 6–8, begins a series of procedures that describe the  
removal and installation of modules.  
Preparation  
Please read the following warning statement. Then read the following general  
instructions before removing a module.  
WARNING. Only qualified personnel should perform service procedures. Before  
doing this or any other procedure in this manual, read the General Safety  
Summary and Service Safety Summary found at the beginning of this manual.  
Also, to prevent possible injury to service personnel or damage to electrical  
components, read Preventing ESD on page 6–1.  
1. Read the Summary of Procedures on page 6–6 to understand which  
procedure to use to access a given module. Then read Tools Required on  
page 6–7 for a list of tools needed to remove and install modules in the  
TekScope instrument.  
2. If you are disassembling the TekScope instrument for cleaning, refer to the  
Inspection and Cleaning procedure on page 6–2 for cleaning instructions.  
List of Modules  
The Mechanical Parts List chapter provides a list of all replaceable modules.  
Any electrical or mechanical module, assembly, or part listed in the parts list is  
referred to as a module.  
6–5  
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Maintenance  
Summary of Procedures  
Table 6–2 lists the removal and installation procedures in order of increasing  
complexity.  
Table 6–2: Removal and installation procedures  
Procedure  
Modules Accessed  
Tilt stand  
Begins on Page  
Tilt Stand  
6–8  
Front-Panel Label  
Front Cover  
Front-panel label  
Front cover  
6–10  
6–11  
Display shield  
Switch mat  
Gasket  
Handle  
Battery door  
Screws  
Display Module  
Back Cover  
Display module  
6–16  
6–19  
Inverter board  
DC power hole plug  
I/O port hole plug  
Back cover / back label / battery contact  
assembly  
Complete Disassembly  
Chassis / BNC connectors / banana jacks  
Main board  
6–23  
Switch flex-circuit assembly  
Display cable  
Inverter board cable  
2
Foam pad set  
2
Some pieces in the foam pad set are accessed by the Front Cover and Back Cover  
procedures.  
6–6  
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Maintenance  
Tools Required  
You will need the following tools to remove and replace all the modules in the  
TekScope instrument.  
H
H
H
H
H
Torque-limiting screwdriver, 12 in lb (1.3 N m) range with Torx T-15 tip  
Screwdriver with 1  
Screwdriver with 1  
Needle-nose pliers  
@
4 inch flat blade  
8@ inch flat blade  
Sharp knife (X-ACTO knife or equivalent)  
6–7  
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Maintenance  
Tilt Stand  
You will need a 1  
4@ inch flat-bladed screwdriver to remove the tilt stand.  
STOP. You do not have to remove the tilt stand to access internal modules. In  
most cases, you do not have to remove the tilt stand to clean the TekScope  
instrument exterior.  
Removal. Use this procedure to remove a defective tilt stand.  
1. Place the TekScope instrument face down on a soft surface (such as an  
anti-static mat).  
2. Insert the 1  
4@ inch flat-bladed screwdriver into the gap between the tilt stand  
and instrument case as shown in Figure 6–1.  
3. Twist the screwdriver gently to release one side of the tilt stand from the  
instrument case. Take care not to damage the case.  
Figure 6–1: Removing the tilt stand  
6–8  
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Maintenance  
Installation. Use this procedure to install a new tilt stand.  
1. Orient the tilt stand to the back of the instrument case with the hinge pins  
toward the top and the side bump toward the handle.  
2. Insert one hinge pin into its socket and place the other into the cavity in the  
back of the instrument case as shown in Figure 6–2.  
3. Rotate the tilt stand to slide the second hinge pin upward and into its socket.  
1
Insert hinge pin into the socket.  
2
Rotate the tilt stand to slide the  
second hinge pin into its socket.  
Figure 6–2: Installing the tilt stand  
6–9  
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Maintenance  
Front-Panel Label  
You will need a sharp knife and needle-nose pliers to remove a defective  
front-panel label.  
CAUTION. Removal of a front-panel label will destroy it. Do not remove it unless  
it is defective and needs to be replaced.  
Removal. Use this procedure to remove a defective front-panel label.  
1. Use the sharp knife to pry up a corner of the label.  
2. Use the needle-nose pliers to peel the label off.  
Installation. Use this procedure to install a new front-panel label in either a new  
or the existing front cover.  
1. Peel the paper off the back side of the new label.  
2. Handling the label by its edges only, align it with the recess in the front  
cover as shown in Figure 6–3.  
3. When properly aligned, press the new label into place.  
Front-panel label  
Recess in the front cover  
Figure 6–3: Installing a new front-panel label  
6–10  
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Maintenance  
Front Cover  
You will need a torque-limiting Torx T-15 screwdriver, needle-nose pliers, and  
sharp knife to remove the front cover and other immediately accessible modules.  
CAUTION. Attempting to remove the display shield from the front cover will likely  
destroy both pieces. If one or the other are defective, both must be replaced.  
Removal. Use this procedure to remove the front cover and access the handle,  
switch mat, battery door, and gasket.  
1. Disconnect all probes, cables, or meter leads from the instrument.  
2. Disconnect the AC adapter, open the battery door, and remove the battery.  
3. Place the TekScope instrument face down on a soft surface (such as an  
anti-static mat).  
4. Use the Torx T-15 screwdriver to remove the four screws that hold the case  
together.  
5. Holding the case together, pick it up and place it back side down on a soft  
surface.  
6. As you lift the front cover off the instrument, press the buttons as necessary  
to prevent the switch mat from coming off with the front cover.  
7. To remove the handle, slip it off its guides.  
8. To remove the switch mat, lift it off the switch flex-circuit assembly. Place it  
button-side down on a clean surface.  
CAUTION. To avoid contamination of switch contacts, do not touch the carbon  
contacts on the switch flex-circuit assembly or on the back side of the switch  
mat.  
9. To remove the battery door, use the needle-nose pliers to slip the retaining  
tether off of the post inside the instrument case as shown in Figure 6–4.  
6–11  
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Maintenance  
Figure 6–4: Removing the battery door  
NOTE. In most cases, the gasket does not have to be removed from the front cover  
for interior cleaning.  
10. To remove the gasket from the front cover, use the needle-nose priers to lift  
it out of the groove in the front cover, starting with the accessible tail at the  
bottom of the front cover.  
Installation. Use this procedure to install the battery door, switch mat, handle,  
gasket, and front cover.  
1. Place the TekScope instrument back side down on a soft surface (such as an  
anti-static mat).  
2. To install the battery door, pass the retaining tether through the battery  
opening from the outside and then use the needle-nose pliers to slip the  
retaining strap onto the post (see Figure 6–4).  
3. To install the switch mat, place it (contact side down) on the switch  
flex-circuit assembly. The five rubber guideposts fit into holes in the circuit  
board.  
6–12  
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Maintenance  
4. If you are installing a new front cover, follow these steps to assemble it  
before installation. Refer to Figure 6–5.  
a. Install a new label using the procedure on page 6–10.  
b. Install a new display shield into the inside of the new front cover.  
Remove the backing paper from the adhesive on the display shield, align  
it over the two diagonal posts, and then press it into place. The blue  
border should be even when viewed from the face of the front cover.  
c. Install new foam pad as shown in Figure 6–5.  
Display shield  
Foam pad  
Front cover  
Figure 6–5: Assembling a new front cover  
d. Install a new gasket into the groove around the edge of the front cover.  
As shown in Figure 6–6, start the gasket at the bottom of the cover  
leaving a short (1  
@
8 inch) tail through the slot. Carefully press the gasket  
into place around the rim with the 1  
8@ inch flat-bladed screwdriver. To  
finish the installation, overlap the starting point and then pass the end of  
the gasket through the remaining slot. Trim the ending tail to 1  
length with the sharp knife.  
8@ inch  
6–13  
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Maintenance  
Gasket material  
Front cover  
1
Trim tails to  
@
inch  
8
Overlap gasket material  
Figure 6–6: Installing the gasket  
5. Slip the handle into the guides of the back cover as shown in Figure 6–7.  
6. Place the front cover assembly onto the instrument. Taking care not to pinch  
the handle, align it into the guides in the front cover. Align the buttons so  
they all protrude through the holes in the front cover.  
7. Holding the case together, pick it up and place it front side down on a soft  
surface.  
6–14  
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Maintenance  
Velcro strip  
Fold end of handle over  
Figure 6–7: Installing the handle  
6–15  
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Maintenance  
CAUTION. To avoid cross-threading or cutting new threads with the screws,  
carefully follow the procedure in the next step.  
8. To install the four screws, follow these steps:  
a. Place the screws into their holes in the back cover.  
b. Using the torque-limiting Torx T-15 screwdriver, slowly turn each  
screw backward (counterclockwise) until you feel the thread drop and  
then gently tighten the screw (turn clockwise) into the existing thread.  
c. When all four all screws are in, hold a corner of the case together firmly  
to compress the gasket while tightening its screw until snug. Repeat for  
the other corners. Do not overtighten the screws (12 in lbs or 1.m N m  
maximum torque).  
9. Replace the battery as shown on page 2–2, and then close the battery door.  
Display Module  
You will need a 1  
8@ inch flat-bladed screwdriver to remove the display module  
and inverter board.  
Removal. First remove the front cover and switch mat using the procedure on  
page 6–11. Then, use the following procedure to remove the display module and  
inverter board.  
1. Fold the switch flex-circuit assembly toward you to expose the display  
module and inverter board.  
CAUTION. To avoid scratching the surface of the display module, do not let it  
touch any hard object.  
The display module surface may scratch easily. To clean it, first try pressurized  
air. If a soft cloth is required to clean it, use very light pressure.  
2. To remove the inverter board, unplug the input and output connectors and  
then lift the inverter board off the two guideposts. You may want to use the  
1
8@ inch flat-bladed screwdriver to help release the connectors from their  
sockets.  
3. To remove the display module, follow these steps:  
a. Disconnect the cable from the display module to the inverter board, if it  
is not already disconnected.  
b. Lift the right side of the display module out of the chassis and fold the  
display module to the left, as shown in Figure 6–8.  
6–16  
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Maintenance  
Display module  
Display cable connector  
Inverter board  
Spring  
Switch flex-circuit board  
Figure 6–8: Removing the display module  
c. Using the 1  
cable connector as shown in Figure 6–9.  
8@ inch flat-bladed screwdriver, carefully open the display-  
d. When the connector is open, slip the display cable out of the connector  
to free the display module.  
6–17  
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Maintenance  
Contact side of cable  
Figure 6–9: Opening the display cable connector  
Installation. Use this procedure to install the display module and inverter board.  
1. Open the display-cable connector on the back of the display module.  
2. Hold the display module upright as shown in Figure 6–8.  
3. Insert the display cable into its connector and then use the 1  
8@ inch flat-bladed  
screwdriver to close the connector. Check that the display cable is fully  
inserted into the connector.  
4. Fold the display module back into the chassis and seat it between the foam  
pads.  
5. Plug the cable from the display module into the inverter board and then route  
the cable in the channels as shown in Figure 6–10.  
6. Place the inverter board into its cavity over the guideposts in the chassis.  
7. Reconnect the connector to the bottom of the inverter board and route the  
wires as shown in Figure 6–10.  
8. If you just installed a new display module, peel off the protective plastic  
sheet.  
9. Fold the switch flex-circuit assembly back over the display module and  
inverter board.  
10. Install the switch mat and front cover using the procedure on page 6–12.  
6–18  
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Maintenance  
Display module  
Inverter output  
connector  
Route cable  
through channels  
Inverter board  
Inverter input  
connector  
Route cable  
through channel  
Route cable  
under clip  
Figure 6–10: Routing cables to the inverter board  
You will need a 1  
8@ inch flat-bladed screwdriver and needle-nose pliers to remove  
Back Cover  
the chassis assembly and hole plugs from the back cover.  
NOTE. The back labels and battery contacts are an integral part of the back  
cover. If any of these parts are defective, the back cover must be replaced.  
Removal. First remove the front cover and switch mat using the procedure on  
page 6–11. Then, use the following procedure to remove the chassis assembly.  
1. Place the instrument back-side down on a soft surface.  
2. Lift the battery connector, located on the handle-side of the chassis, off its  
retaining pins and disconnect the connector.  
3. Insert the 1  
at the location shown in Figure 6–11.  
8@ inch flat-bladed screwdriver between the back cover and chassis  
6–19  
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Maintenance  
4. Carefully lift the bottom of the chassis out of the back cover. As the chassis  
assembly comes out, pull it toward you to back the BNC connectors out of  
their holes in the back cover.  
Figure 6–11: Lifting the chassis  
5. When the chassis is free from the back cover, set it aside with the main board  
facing down on a soft, static-free surface.  
6. To remove a defective DC power hole plug or I/O port hole plug, follow  
these steps:  
a. From the outside of the back cover, pull on the hole plug.  
b. From the inside of the back cover, use the 1  
8@ inch flat-bladed screwdriver  
to work each retaining tab out of its hole in the back cover.  
Installation. Use this procedure to install the hole plugs and chassis assembly into  
the back cover.  
1. To install a new hole plug, insert the retaining tabs into their holes in the  
back cover. While pushing on the plug from the outside, pull gently on the  
tabs from the inside with the needle-nose pliers until they lock into place.  
2. To install the chassis assembly into the back cover, follow these steps:  
a. If the instrument was completely disassembled, check that the chassis is  
properly assembled.  
b. Check that all foam pads inside the back cover are correctly installed.  
Refer to Figure 6–12 for the correct locations.  
6–20  
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Maintenance  
Install DC power  
hole plug  
Install foam pads  
Install foam pad  
Install I/O port  
hole plug  
Install foam pad  
Install foam pads  
Figure 6–12: Foam pad and hole plug locations on the back cover  
c. Place the back cover on a soft surface with the BNC connector openings  
facing away from you.  
d. Dress the battery wires to the left side of the back cover to provide  
clearance for the chassis.  
e. While inserting the BNC connectors into their openings, lower the  
chassis into the back cover.  
f. Reconnect the battery wire connector and press it onto its retaining pins.  
Check that the polarity of the connector is correct. Dress the wires into  
the channel on the chassis as shown in Figure 6–13.  
3. Install the switch mat and front cover using the procedure on page 6–12.  
6–21  
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Maintenance  
Retain connectors  
between pins  
Locate ferrite  
bead in cavity  
Dress wires from battery  
pack through slots  
Figure 6–13: Routing the battery wires  
6–22  
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Maintenance  
Complete Disassembly  
You will need a 1  
8@ inch flat-bladed screwdriver and needle-nose pliers to remove  
modules mounted to the the chassis.  
Removal. First, remove the front cover and switch mat using the procedure on  
page 6–11. Next, remove the chassis assembly using the procedure on page  
6–19. Then, use the following procedure to disassemble the chassis.  
STOP. If you are disassembling only for cleaning, inspect the chassis assembly to  
determine whether further disassembly is required to perform internal cleaning.  
If so, then proceed.  
1. Remove the display module and inverter board using the procedure on  
page 6–16.  
2. With the switch flex-circuit assembly folded toward you, place the chassis  
assembly on a soft, static-free surface with the main board side facing up.  
3. To remove the main board and switch flex-circuit assembly from the chassis,  
follow these steps:  
a. Use the needle-nose pliers to remove both coaxial connectors from the  
back side of the BNC connectors. Be careful not to crush the cable.  
b. Use the 1  
8@ inch flat-bladed screwdriver to open the display cable  
connector on the main board and then disconnect the display cable. Refer  
to Figure 6–9 on page 6–18 if necessary.  
c. Dress the battery cable outward to free it from obstructions.  
d. Following the sequence (circled numbers) shown in Figure 6–14, lift  
gently on the edges of the main board while releasing the board-retaining  
snaps.  
CAUTION. To prevent damage to the flex circuit, take care not to twist the flex  
circuit at its connection to the main board.  
e. When all six snaps are released, lift the main board and switch flex-cir-  
cuit assembly out of the chassis enough to access the back side of the  
banana jacks.  
f. Use the needle-nose pliers to remove both wires from the back side of  
the banana jacks. Be careful not to deform the connectors attached to the  
wires.  
g. Complete the removal of the main board and switch flex-circuit  
assembly and then place it on a soft, static-free surface with the two  
metal shields facing up.  
6–23  
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Maintenance  
Unplug connectors  
Battery cable  
Unplug connectors  
6
5
4
3
1
2
Display  
module cable  
Lift here  
Figure 6–14: Removing the main board and switch flex-circuit assembly  
4. To remove the switch flex-circuit assembly from the main board, follow  
these steps:  
a. With the main board laying flat from the previous step, raise the switch  
flex-circuit assembly to an upright position.  
b. While holding the flex-circuit assembly upright, use both thumbs and  
forefingers to grasp the left and right sides of the connector.  
c. Carefully, alternate pulling on the left and right sides of the connector to  
work it out of its socket. Do not pull one side out much farther than the  
other or bent pins may result.  
5. To remove the inverter board cable from the main board, unplug it.  
NOTE. The BNC connectors and banana jacks are an integral part of the chassis.  
If any of these connectors are defective, the chassis must be replaced.  
6–24  
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Maintenance  
Installation. Use this procedure to reassemble the entire instrument.  
1. Check that the ten foam pads on the chassis are correctly installed. The foam  
pads that surround the display module should be aligned to locating marks in  
the chassis. Refer to Figure 6–15 for the locations of all the foam pads.  
Typical locating marks  
Align this foam pad with  
bottom edge of chassis  
Figure 6–15: Foam pad locations on the chassis  
2. Place the main board on a soft, static-free surface with the two metal shields  
facing up and away from you.  
3. Install the inverter board cable (either end) into its connector (J7) on the  
main board.  
4. To reconnect the switch flex-circuit assembly to the main board, follow these  
steps:  
a. Hold the switch flex-circuit assembly upright with the carbon contacts  
facing you.  
b. Use both thumbs and forefingers to grasp the left and right sides of the  
connector.  
c. From both sides, push the connector into its socket. You may need to  
alternate pushing on the left and right sides to insert the connector.  
6–25  
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Maintenance  
5. To prepare the main board and switch flex circuit board for installation into  
the chassis, follow these steps:  
a. Fold the switch flex-circuit assembly toward you.  
b. Dress the battery wires away from you.  
c. Dress the two coaxial cables that will connect to the BNC connectors to  
a position under the main board.  
d. Dress the two wires that will connect to the banana jacks to a position  
under the main board.  
6. To install the main board and switch flex-circuit assembly into the chassis,  
follow these steps:  
a. Place the chassis on a soft, static-free surface with the BNC connectors  
facing away from you and the banana jacks facing left.  
b. Lift the main board and switch flex-circuit assembly together and turn  
them over keeping the switch flex-circuit assembly facing you.  
c. Place the main board and switch flex-circuit assembly on the chassis so  
that you can attach the two wires to the back of the banana jacks.  
d. Use the needle-nose pliers to attach both wires to the back side of the  
banana jacks. Be careful not to deform the connectors attached to the  
wires. Dress the wires so that they will fit between the main baord and  
the chassis.  
e. Insert the four tabs on the left side of the main board into their rectangu-  
lar holes in the chassis as shown in Figure 6–16.  
f. While lowering the right side of the main board, dress the battery wires  
into the slot in the chassis.  
g. When the main board is lowered in place, snap it into the six retaining  
snaps of the chassis.  
h. Use the needle-nose pliers to insert both coaxial connectors into the back  
side of the BNC connectors. Be careful not to crush the cable or bend the  
center conductor.  
6–26  
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Maintenance  
Insert circuit board tabs  
into chassis holes  
Route battery cable into  
slot in chassis (not shown)  
Figure 6–16: Reassembling the chassis  
7. To install the display cable, follow these steps:  
a. Use the 1  
8@ inch flat-bladed screwdriver to open the connector on the  
main board.  
b. With the conductive contacts facing away from the main board, insert the  
display cable into its connector.  
c. Use the 1  
8@ inch flat-bladed screwdriver to close the connector and then  
check that the display cable is fully inserted into the connector.  
d. Dress the display cable down through the slot in the chassis.  
8. Turn the chassis assembly over so that the main board is facing down.  
9. Install the display module and inverter board using steps 1 through 9 of the  
procedure on page 6–18.  
10. Install the chassis assembly into the back cover using steps 1 and 2 of the  
procedure on page 6–20.  
11. Install the switch mat and front cover using the procedure on page 6–12.  
12. If detached, install the tilt stand using the procedure on page 6–9.  
This completes the reassembly of the instrument.  
6–27  
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Maintenance  
Troubleshooting  
This section contains information and procedures to help you isolate a defective  
module in the TekScope instrument.  
WARNING. Before doing this or any other procedure in this manual, read the  
General Safety Summary and Service Safety Summary found at the beginning of  
this manual. Also, to prevent possible injury to service personnel or damage to  
electrical components, read Preventing ESD on page 6–1.  
Adjustment After Repair  
If you replace the main board, you must adjust the instrument after repair. Refer  
to the chapter Adjustment Procedures for information about adjustment.  
Required Tools and  
Equipment  
You may need the the following tools and equipment to troubleshoot the  
instrument.  
Tools and Equipment  
AC adapter  
Example  
Standard accessory to TekScope instrument  
Standard accessory to TekScope instrument  
Battery pack, fully charged  
Oscilloscope with 10X probe  
Tektronix TDS 300- or TDS 400-series with standard  
accessory probe  
DMM  
Tektronix DMM200- or DMM300-series handheld  
multimeter  
1
@
inch flat-bladed screwdriver  
Hunter 30312  
8
Metal paper clip  
Common office accessory  
Begin Here  
Begin with these steps to isolate a defective module. Some steps direct you to  
other procedures in this section.  
1. Install a charged battery, connect the AC adapter, and then turn on the  
TekScope instrument. If (after a short wait) the display backlight turns on  
and the display appears to operate normally, then skip to Executing  
Diagnostics on page 6–35.  
2. If (after a short wait) the display backlight turns on but the display shows  
any of the following symptoms, turn off the instrument immediately. Skip to  
Display on page 6–33.  
H
H
Display color is dark blue or violet when viewed straight on  
Display color is abnormal (green or orange) when viewed straight on  
6–28  
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Maintenance  
H
Displayed information is interrupted by static horizontal or vertical lines  
or stripes  
3. If (after a short wait) you can see that the display operates normally but the  
display backlight does not turn on, then skip to Backlight on page 6–32.  
4. If the instrument does not appear to turn on (no display backlight, no sound  
of relay clicks, no displayed information), then continue with step 5.  
5. Disconnect the AC adapter from the instrument. Remove the front cover  
using the procedure Front Cover on page 6–11.  
6. Reinstall the battery (removed in the Front Cover procedure).  
7. Verify that the battery connector is properly connected. See Figure 6–17.  
CAUTION. To avoid damage to the battery or battery contacts, be careful not to  
short the conductors at the battery connector.  
Test here  
Figure 6–17: Battery connector location  
6–29  
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Maintenance  
8. With the AC adapter still disconnected, use a DMM to measure the DC  
voltage at the battery connector. Follow the instructions in the table below.  
Voltage Measurement at Battery  
Connector  
Instructions  
Approximately 0 V  
Check that the battery is installed correctly.  
DC  
Remove the battery and measure its voltage. You  
should measure an open-circuit voltage >4.8 V  
across a fully charged battery.  
DC  
If the battery is charged, the battery contacts inside  
the back cover are probably defective. Replace the  
back cover assembly.  
Greater than 0 V but less than 4 V  
Remove the battery and measure its voltage. The  
open-circuit voltage across a good battery should  
DC  
DC  
measure >4 V , even if not fully charged. If it  
DC  
.
remains <4 V , the battery may be defective.  
DC  
Replace it.  
If the battery is fully charged (open-circuit voltage  
>4.8 V ) but the voltage under load is <4 V , the  
DC  
DC  
main board is drawing excessive current. Replace  
the main board.  
Greater than 4 V (check both mating  
Remove the battery and then proceed with step 9.  
DC  
connectors)  
9. With the battery removed from the instrument, reattach the AC adapter to the  
instrument. Measure the DC voltage at the battery connector. Follow the  
instructions in the table below.  
Voltage Measurement at Battery  
Connector  
Instructions  
Less than 1 V  
Check that the AC adapter is connected correctly.  
DC  
Disconnect the AC adapter and measure its output  
voltage. If the voltage is less than 12 V , the AC  
DC  
adapter is probably defective. Replace it.  
Greater than 1 V  
Proceed with step 10.  
DC  
10. Reinstall the battery. Leave the AC adapter connected to the instrument.  
11. Use a 1  
8 inch flat-bladed screwdriver to lift the lower edge of the chassis  
@
assembly out of the back cover just until the connector from the flex-circuit  
assembly to the main board is accessible.  
6–30  
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Maintenance  
12. Using a bent paper clip, momentarily short pins 15 and 17 of the connector  
to bypass the ON/STBY switch as shown in Figure 6–18. Follow the  
instructions in the table below.  
Instrument Behavior  
Instructions  
Instrument turns on  
Inspect and/or clean the switch flex-circuit assembly  
and the switch mat. If cleaning does not solve the  
problem, one or the other are defective. Replace  
them both.  
Instrument does not turn on  
The main board is probably defective.  
Replace it.  
Figure 6–18: Bypassing the ON/STBY switch  
6–31  
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Maintenance  
Backlight  
Follow these steps to troubleshoot a nonfunctional backlight.  
1. Remove the front cover using the procedure Front Cover on page 6–11.  
2. Turn the instrument on, remove the switch mat, and then fold the switch  
flex-circuit assembly toward you to access the inverter board.  
WARNING. To avoid electrical shock, do not touch the two-wire output connector  
of the inverter board. The output connector is the one closest to the display  
module.  
3. Using a DMM, measure the DC voltage across pins 1 and 2 of the input  
connector on the inverter board. Follow the instructions in the table below.  
Voltage Measurement at Inverter  
Input Connector  
Instructions  
Approximately 0 V  
Check that the inverter input cable is properly  
connected at both ends.  
DC  
Fold the switch flex-circuit assembly back over the  
1
instrument. Use a  
@
inch flat-bladed screwdriver to  
8
lift the lower edge of the chassis assembly out of  
the back cover until you access the edge of the  
main board.  
Remove the inverter input cable from the main  
board. Measure the DC voltage on pins 1 and 2 of  
the connector on the main board.  
If the measured voltage is approximately 12 V  
,
DC  
the inverter input cable is defective. Replace it.  
If the measured voltage is approximately 0 V , the  
DC  
main board is probably defective. Replace it.  
Approximately 12 V  
Proceed with step 4.  
DC  
4. Using an oscilloscope and 10X probe, attach the probe ground lead to the  
ground terminal on the right side of the instrument. Set the oscilloscope time  
base to 1 ms/div and vertical sensitivity to 1 V/div.  
NOTE. The inverter output voltage is approximately a 250 VRMS, 40 kHz sine  
wave. Capacitive coupling to the oscilloscope probe tip is sufficient to determine  
if the inverter output voltage is present.  
6–32  
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Maintenance  
5. Hold the probe tip above the output connector of the inverter board. Do not  
touch the probe tip to either of the conductors in the connector. Follow the  
instructions in the table below.  
Oscilloscope Display  
Instructions  
No signal displayed  
The inverter board is probably defective.  
Replace it.  
Approximately 40 kHz sinewave dis-  
played  
The display module is probably defective.  
Replace it.  
Display  
Follow these steps to troubleshoot a nonfunctional display.  
1. Remove the front cover using the procedure Front Cover on page 6–11.  
2. Remove the display module and inverter board using the procedure Display  
Module on page 6–16.  
3. Fold the switch flex-circuit board back over the instrument and reinstall the  
switch mat.  
4. Connect the AC adapter to the instrument  
5. Turn the instrument on, remove the switch mat, and then fold the switch  
flex-circuit assembly toward you to access display cable.  
NOTE. Without the display module installed, the simplest way to verify that the  
instrument is on is to probe the PROBE COMP output with an oscilloscope. If  
the instrument is on, the PROBE COMP output generates approximately a 5 V,  
1.2 kHz squarewave.  
6. Use an oscilloscope and 10X probe to probe the contacts on the loose end of  
the display cable. The table below describes the signals you should expect to  
see. If some or all of the signals are not present, then skip to step 9.  
Signal at Loose End of Display Cable  
Description  
Pin 1 (closest to bottom of  
instrument)  
No signal, might appear noisy  
Pin 2  
Pin 3  
Pin 4  
Pin 5  
Pin 6  
No signal, might appear noisy  
Digital data, high = 5 V, low = 0 V  
Digital data, high = 5 V, low = 0 V  
Digital data, high = 5 V, low = 0 V  
Digital data, high = 5 V, low = 0 V  
6–33  
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Maintenance  
Signal at Loose End of Display Cable  
Description  
Pin 7  
Pin 8  
Pin 9  
Pin 10  
–10 V to –22 V  
DC  
DC  
0 V (ground)  
+5 V  
DC  
1.89 MHz clock (528 ns period), 50% duty cycle,  
appears in bursts, high = 5 V, low = 0 V  
Pin 11  
19.3 kHz clock (51.7 ms period), 16% duty cycle,  
high = 5 V, low = 0 V  
Pin 12 (closest to BNC end of  
instrument)  
75.5 Hz clock (13.2 ms period), 0.4% duty cycle,  
high = 5 V, low = 0 V  
7. If all the signals are present on the loose end of the connector, turn the  
instrument off and then reinstall the display module using the procedure on  
page 6–18.  
8. Turn the instrument on. If the problem persists, the display module is  
probably defective. Replace it.  
9. Remove the chassis assembly from the back cover using the procedure Back  
Cover on page 6–19.  
10. Place the chassis assembly on a soft, static-free surface with the main board  
facing up and the switch flex-circuit assembly folded out toward you. Install  
the switch mat on the switch flex-circuit assembly.  
11. Check, and if necessary, reconnect the display cable connection to the main  
board. Inspect the display cable for any sign of damage; if damage is  
evident, replace it.  
12. Connect the AC adapter to the instrument and turn it on. Verify that the  
instrument is on by probing the PROBE COMP output.  
13. Probe the display signals at the display connector of the main board as was  
done in step 6.  
14. If some or all of the signals are not present at the main board display  
connector, the main board is probably defective. Replace it.  
6–34  
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Maintenance  
Executing Diagnostics  
Follow these steps to troubleshoot using diagnostics.  
1. To execute the internal diagnostic tests, remove all input signals from the  
instrument and then perform the following steps:  
System  
Diag  
Once  
SCOPE  
UTILITY  
Loop  
Execute  
OK Run Test  
2. A dialog box displays the result when the diagnostic tests completes. If any  
test fails, the main board is probably defective. Replace it.  
3. If all tests pass, press the CLEAR MENU button to continue operation.  
4. You should be able to compensate the signal path of a functioning instru-  
ment. To execute Signal Path Compensation, remove all input signals from  
the instrument and then perform the following steps:  
System  
Cal  
SCOPE  
UTILITY  
Signal Path  
OK Compensate Signal  
Paths  
5. If Signal Path Compensation does not complete successfully, perform the  
Factory Cal Scope adjustment on page 5–5 and then repeat step 4.  
6. If all tests pass, press the CLEAR MENU button to continue operation.  
7. If trouble persists, proceed to Input Connections.  
6–35  
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Maintenance  
Input Connections  
Follow these steps to troubleshoot the input connections only if the following  
condition is true: the instrument appears to function normally in every way  
except you have determined that the channel 1, channel 2, or DMM signal is not  
getting into the instrument as expected.  
1. Remove the front cover using the procedure Front Cover on page 6–11.  
2. Remove the chassis assembly from the back cover using the procedure Back  
Cover on page 6–19.  
3. Check that the coaxial connections to the back side of the channel 1 and  
channel 2 BNC connectors are intact. Use the DMM to measure continuity  
from the BNC connector to the end of the coaxial cable where it attaches to  
the main board.  
4. Check that the wire connections to the back side of the DMM and COM  
banana jacks are intact. Use the DMM to measure continuity from the  
banana jacks to the end of the wire where it attaches to the main board.  
5. If no problem is found and the trouble persists, the main board is probably  
defective in some way that the internal diagnostics cannot detect. Replace it.  
6–36  
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Maintenance  
Other Troubleshooting  
Use these techniques to troubleshoot other parts of the instrument.  
Buttons. Press each of the front-panel buttons to verify that it operates properly.  
The table below lists the buttons that depend on a particular instrument state for  
you to see an effect when the button is pressed. Unless noted otherwise, the  
instrument should be in scope mode for this test.  
Button  
Precondition  
Expected Behavior  
HARD COPY  
None  
With no connection to the  
RS-232 port, a message  
will appear approximately  
10 seconds after HARD  
COPY is pressed  
Any bezel button  
CLEAR MENU  
SCOPE  
Press DISPLAY first  
Press DISPLAY first  
Press METER first  
Displays pop-up menu  
Removes menu  
Changes to scope mode  
Cursor moves  
+
/– Rocker  
Press CURSOR and then  
choose Function V Bars first  
TOGGLE  
Press CURSOR and then  
choose Function V Bars first  
Changes active cursor  
WAVEFORM OFF  
VERTICAL MENU  
VOLTS/DIV  
Press CH 1 first  
Press CH 1 first  
Press CH 1 first  
Press CH 1 first  
Press CH 1 first  
Removes waveform  
Displays menu  
Changes sensitivity  
Repositions waveform  
Changes trigger level  
VERTICAL POSITION  
TRIGGER LEVEL  
SET LEVEL TO 50%  
Adjust TRIGGER LEVEL first Resets trigger level  
If any button fails to operate, inspect and/or clean the switch flex-circuit  
assembly and the switch mat. If cleaning does not solve the problem, the switch  
flex-circuit assembly, switch mat, or main board may be defective. Use the  
procedure below to isolate the problem:  
1. Replace the switch flex-circuit assembly and then retest the buttons. If the  
problem persists, proceed to step 2.  
2. Replace the switchmat and then retest the buttons. If the problem persists,  
proceed to step 3.  
3. Replace the main board.  
6–37  
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Maintenance  
PROBE COMP Output. When the instrument is on, the PROBE COMP output  
should generate a square wave, approximately 5 V in amplitude, at a 1.2 kHz  
frequency. Use the oscilloscope and a 10X probe to probe this output. If the  
signal is not present, the main board is probably defective. Replace it.  
RS-232 Port. Verify that the RS-232 port operates properly. The easiest way to  
test the port is to make a hard copy with a compatible printer and RS-232 cable.  
To prepare to make a hard copy, verify the following statements:  
H
The printer is compatible with one of the supported formats: Deskjet,  
DPU 411/II, DPU 412, Epson 9-pin, Epson 24-pin, Laserjet, or Thinkjet.  
H
H
The printer is equipped with a serial (RS-232) port.  
The printer is connected to the instrument through a known good RS-232  
cable and adapter (if needed).  
H
H
The printer is powered on and paper is loaded.  
The printer baud rate setting is known.  
Set up the instrument and start the hard copy with the following steps:  
System  
RS-232  
SCOPE  
UTILITY  
Set RS232 Param-  
eters To Defaults  
Baud rate  
Set baud rate to  
match printer baud  
rate  
System  
Format  
Hard Copy  
Choose format to  
match printer  
1
OK Select Format  
HARD COPY  
1
You may need to press Select Page to display additional printer formats.  
If the RS-232 port is defective, replace the main board.  
6–38  
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Maintenance  
Battery and External Power. Verify the battery and external power with the  
following procedure:  
NOTE. If the instrument runs normally under battery power but only for a short  
time, the battery may have lost its capacity to hold a charge. You may be able to  
recover some of its capacity by repeatedly charging and then completely  
discharging the battery several times. If several charge/discharge cycles do not  
improve the battery life, it should be replaced.  
1. Install a fully charged battery and connect the AC adapter to the instrument.  
2. Turn the instrument on.  
3. Disconnect the AC adapter plug from the instrument. If the instrument turns  
off, then battery power is not working. Go back to step 5 on page 6–29 to  
troubleshoot the problem.  
4. While the instrument is running, reconnect the AC adapter and then remove  
the battery. If the instrument turns off then external power is not working.  
Disconnect the AC power adapter from the instrument and use a DMM to  
measure its DC output voltage. Follow the instructions in the table below.  
AC Adapter Voltage Measurement  
Less than 12 V  
Instructions  
The AC adapter is probably defective.  
Replace it.  
DC  
Greater than 12 V  
The main board is probably defective.  
Replace it.  
DC  
6–39  
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Maintenance  
Unpacking and Repacking Instructions  
This section contains the information needed to unpack the TekScope instrument  
and repack it for shipment or storage.  
Unpacking  
The TekScope instrument and its standard accessories are carefully packed at the  
factory in a padded case, which is enclosed in a shipping carton. If, upon receipt,  
damage to the shipping carton is evident, notify the shipper. Tektronix, Inc. is  
not responsible for damage caused during shipping.  
If you have not already done so, carefully remove the TekScope instrument and  
its accessories from the padded case and inspect them for damage. Save the  
shipping carton for repacking or storage.  
Repacking  
Use a corrugated cardboard shipping carton having a test strength of at least  
275 pounds (125 kg) and with an inside dimension at least six inches (15.25 cm)  
greater than the instrument dimensions.  
If the instrument is being shipped to a Tektronix Service Center, enclose the  
following information:  
H
H
H
H
H
The owner’s address  
Name and phone number of a contact person  
Type and serial number of the instrument  
Reason for returning  
A complete description of the service required  
Seal the shipping carton with an industrial stapler or strapping tape.  
Mark the address of the Tektronix Service Center and also your own return  
address on the shipping carton in two prominent locations.  
Storage  
The TekScope instrument should be stored in a clean, dry environment. The  
following environmental characteristics apply for both shipping and storage  
(instrument not operating):  
H
H
Temperature range: –20° C to +60° C  
Altitude: To 15,000 m  
See the chapter Specifications for a complete listing of the environmental  
charactertistics.  
6–40  
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Options  
The TekScope instrument options provide AC adapters, User Manuals, and  
Reference Manuals for international customers. Table 7–1 describes these  
options.  
Table 7–1: TekScope instrument options  
Option  
A1  
A2  
A6  
L1  
Description  
Universal European AC adapter, 220 V  
United Kingdom AC adapter, 240 V  
Japan AC adapter, 100 V  
French-language User and Reference Manuals  
Italian-language User and Reference Manuals  
German-language User and Reference Manuals  
Spanish-language User and Reference Manuals  
Japanese-language User Manual, English-language Reference  
Portuguese-language User and Reference Manuals  
Simple Chinese-language User and Reference Manuals  
Standard Chinese-language User and Reference Manuals  
Korean-language User and Reference Manuals  
Russian-language User Manual  
L2  
L3  
L4  
L5  
L6  
L7  
L8  
L9  
LR  
1B  
2B  
3B  
Includes THS7BAT and THS7CHG for European 220 V  
Includes THS7BAT and THS7CHG for United Kingdom 240V  
Includes THS7BAT and THS7CHG for North American 120V  
7–1  
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Options  
7–2  
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Electrical Parts List  
Refer to the Mechanical Parts List chapter for a complete listing and description  
of replaceable parts for the TekScope instrument.  
8–1  
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Electrical Parts List  
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Diagrams  
See Figure 3–1 on page 3–2 for a block/interconnect diagram of the TekScope  
instrument. There are no additional diagrams in this chapter.  
9–1  
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Diagrams  
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Mechanical Parts List  
This section contains a list of the replaceable modules for the TekScope  
instrument. Use this list to identify and order replacement parts.  
Parts Ordering Information  
Replacement parts are available through your local Tektronix field office or  
representative.  
Changes to Tektronix products are sometimes made to accommodate improved  
components as they become available and to give you the benefit of the latest  
improvements. Therefore, when ordering parts, it is important to include the  
following information in your order.  
H
H
H
H
Part number (see Part Number Revision Level below)  
Instrument type or model number  
Instrument serial number  
Instrument modification number, if applicable  
If you order a part that has been replaced with a different or improved part, your  
local Tektronix field office or representative will contact you concerning any  
change in part number.  
Change information, if any, is located at the rear of this manual.  
Part Number Revision  
Level  
Tektronix part numbers contain two digits that show the revision level of the  
part. For most parts in this manual, you will find the letters XX in place of the  
revision level number.  
Part Number Revision Level  
Revision Level May Show as XX  
670-7918-03  
670-7918-XX  
When you order parts, Tektronix will provide you with the most current part for  
your product type, serial number, and modification (if applicable). At the time of  
your order, Tektronix will determine the part number revision level needed for  
your product, based on the information you provide.  
10–1  
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Mechanical Parts List  
Module Servicing  
Modules can be serviced by selecting one of the following three options. Contact  
your local Tektronix service center or representative for repair assistance.  
Module Exchange. In some cases you may exchange your module for a reman-  
ufactured module. These modules cost significantly less than new modules and  
meet the same factory specifications. For more information about the module  
exchange program, call 1-800-TEK-WIDE, extension 6630.  
New Modules. You may purchase replacement modules in the same way as other  
replacement parts.  
Using the Replaceable Parts List  
This section contains a list of the mechanical and/or electrical components that  
are replaceable for the TekScope instrument. Use this list to identify and order  
replacement parts. The following table describes each column in the parts list.  
Parts List Column Descriptions  
Column Column Name  
Description  
1
Figure & Index Number  
Items in this section are referenced by figure and index numbers to the exploded view  
illustrations that follow.  
2
Tektronix Part Number  
Serial Number  
Use this part number when ordering replacement parts from Tektronix.  
3 and 4  
Column three indicates the serial number at which the part was first effective. Column four  
indicates the serial number at which the part was discontinued. No entries indicates the part is  
good for all serial numbers.  
5
6
Qty  
This indicates the quantity of parts used.  
Name & Description  
An item name is separated from the description by a colon (:). Because of space limitations, an  
item name may sometimes appear as incomplete. Use the U.S. Federal Catalog handbook  
H6-1 for further item name identification.  
7
8
Mfr. Code  
This indicates the code of the actual manufacturer of the part.  
This indicates the actual manufacturer’s or vendor’s part number.  
Mfr. Part Number  
Abbreviations  
Abbreviations conform to American National Standard ANSI Y1.1–1972.  
Mfr. Code to Manufacturer  
Cross Index  
The table titled Manufacturers Cross Index shows codes, names, and addresses  
of manufacturers or vendors of components listed in the parts list.  
10–2  
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Mechanical Parts List  
Manufacturers Cross Index  
Mfr.  
Code  
Manufacturer  
Address  
City, State, Zip Code  
0BL82  
0KB01  
1DM20  
22670  
53279  
80009  
85471  
8X345  
TK1163  
TK2469  
TK2539  
CRT SCIENTIFIC  
14746 RAYMER ST  
VAN NUYS, CA 91405  
STAUFFER SUPPLY CO.  
PARLEX CORP.  
810 SE SHERMAN  
PORTLAND, OR 97214-4657  
SALEM, NH 03079  
7 INDUSTRIAL WAY  
GM NAMEPLATE, INC.  
XENTEK, INC  
2040 15TH AVENUE WEST  
1770 LA COSTA MEADOW DR.  
P.O. BOX 500  
SEATTLE, WA 98119-2783  
SAN MARCOS, CA 92069  
BEAVERTON, OR, 97077-0001  
PORTLAND, OR 97220  
LAKE OSWEGO, OR 97035  
TIGARD, OR 97223  
TEKTRONIX, INC.  
BOYD CORP.  
6136 NE 87TH AVENUE  
5858 SW WILLOW LANE  
9898 SW TIGARD ST.  
NORTHWEST SPRING AND MFG., INC.  
POLY–CAST, INC.  
UNITREK CORP.  
3000 LEWIS AND CLARK HWY., SUITE #2  
315 S. MONTGOMERY, P.O. BOX 2231  
VANCOUVER, WA 98661  
SHERMAN, TX 75070-5070  
ROYAL CASE COMPANY, INC.  
10–3  
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Mechanical Parts List  
Replaceable Parts List  
Fig. &  
Tektronix Part Serial No. Serial No.  
Mfr.  
Index  
Number  
Effective  
Discont’d  
Code  
Qty Name & Description  
Mfr. Part Number  
334-9310-00  
Number  
10–1  
–1  
334-9310-00  
334-9310-10  
334-9310-20  
334-9310-30  
437-0451-10  
437-0451-20  
337-4010-00  
348-1475-00  
260-2615-00  
259-0098-00  
119-4985-11  
214-4706-00  
348-1441-00  
671-3923-0X  
671-3923-1X  
671-4010-0X  
671-3923-2X  
200-4214-00  
200-4267-00  
213-1099-00  
334-8998-00  
348-1426-00  
437-0453-10  
174-3487-01  
174-3366-01  
174-3367-00  
441-2066-01  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
B010100  
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
1
1
1
1
1
1
LABEL: FRONT PANEL (THS710A)  
LABEL: FRONT PANEL (THS720A)  
LABEL: FRONT PANEL (THS730A)  
LABEL: FRONT PANEL (THS720P)  
FRONT COVER (THS710A, THS720A, THS730A)  
FRONT COVER (THS720P)  
22670  
22670  
22670  
22670  
334-9310-10  
–1  
334-9310-20  
–1  
334-9310-30  
–2  
TK1163 437-0451-10  
TK1163 437-0451-20  
–2  
–3  
DISPLAY SHIELD: CLEAR LEXAN  
GASKET: NEOPRENE, 35.0 X 0.045 OD  
SWITCH MAT: ELASTOMERIC  
85471  
337-4010-00  
–4  
0KB01 348-1475-00  
–5  
0BL82  
22670  
80009  
8X345  
85471  
80009  
80009  
80009  
80009  
260-2615-00  
259-0098-00  
119-4985-11  
214-4706-00  
348-1441-00  
671-3923-0X  
671-3923-1X  
671-4010-0X  
671-3923-2X  
–6  
SWITCH FLEX CIRCUIT ASSY  
–7  
DISPLAY MODULE: LCD W/ BACKLIGHT  
SPRING: 0.74 X 0.185 OD  
–8  
–9  
FOAM PAD SET  
–10  
–10  
–10  
–10  
–11  
–12  
–13  
–14  
–15  
–16  
–17  
–18  
–19  
–20  
CIRCUIT BD ASSY: MAIN (THS710A)  
CIRCUIT BD ASSY: MAIN (THS720A)  
CIRCUIT BD ASSY: MAIN (THS730A)  
CIRCUIT BD ASSY: MAIN (THS720P)  
BATTERY DOOR  
TK1163 200-4214-00  
TK1163 200-4267-00  
0KB01 213-1099-00  
HOLE PLUG SET: DC POWER AND I/O PORT  
SCREW: THREAD FORMING, 1.79 X 31 MM, T-15 TORX  
LABEL: BACK COVER, MARKED UL AND CE  
TILT STAND ASSY  
22670  
334-8998-00  
TK1163 348-1426-00  
TK1163 437-0453-10  
TK2469 174-3487-01  
TK2469 174-3366-01  
1DM20 1.00MM–12–3.5–B  
TK1163 441-2066-01  
BACK COVER  
CONTACT ASSY: BATTERY  
CABLE ASSY: INVERTER TO MAIN BD, 5-CONDUCTOR  
CABLE ASSY: DISPLAY TO MAIN BD, 12-CONDUCTOR  
CHASSIS ASSY: INCLUDES BNC CONNECTORS AND  
BANANA JACKS  
–21  
–22  
–22  
671-3673-XX  
346-0280-00  
346-0280-20  
B010100  
B010100  
B010100  
1
1
1
CIRCUIT BD ASSY: INVERTER  
80009  
671-3673-XX  
HANDLE: BLACK WEBBING (THS710A, THS720A, THS730A)  
HANDLE: YELLOW WEBBING (THS720P)  
TK2539 346-0280-00  
TK2539 346-0280-20  
10–4  
THS710A, THS720A, THS730A & THS720P Service Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Mechanical Parts List  
1
2
3
4
22  
9
5
6
7
8
9
21  
9
20  
9
9
19  
10  
11  
12  
18  
17  
9
16  
13  
12  
14  
15  
Figure 10–1: Exploded diagram  
10–5  
THS710A, THS720A, THS730A & THS720P Service Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Mechanical Parts List  
Table 10–1 lists the replaceable standard accessories for the TekScope instrument  
and the instrument options that included them in the original shipment. These  
accessories are not shown in Figure 10–1.  
Table 10–1: Replaceable standard accessories  
Tektronix Part Number or  
Nomenclature  
Instrument Options That  
Include the Accessory  
Description of Accessory  
Passive 10X probes  
Meter lead set  
P6117  
All  
All  
All  
012-1482-00  
THS7BAT  
119-4812-01  
119-4813-01  
Battery pack  
AC adapter (North American) All except A1, A2, and A6  
AC adapter (Universal Euro-  
pean)  
A1 only  
119-4922-01  
119-4923-01  
012-1364-00  
103-0403-00  
016-1399-01  
070-9731-XX  
AC adapter (UK)  
AC adapter (Japan)  
2 m RS-232 cable  
A2 only  
A6 only  
All  
RJ-45 to 9-pin female adapter All  
Soft case All  
User and Reference Manuals All except L1 through L9  
(English)  
070-9732-XX  
070-9733-XX  
070-9734-XX  
070-9735-XX  
070-9736-XX  
070-9737-XX  
070-9738-XX  
070-9739-XX  
070-9740-XX  
071-0011-XX  
User and Reference Manuals L1  
(French)  
User and Reference Manuals L3  
(German)  
User and Reference Manuals L2  
(Italian)  
User and Reference Manuals L9  
(Korean)  
User and Reference Manuals L6  
(Portuguese)  
User and Reference Manuals L4  
(Spanish)  
User and Reference Manuals L7  
(Simplified Chinese)  
User and Reference Manuals L8  
(Traditional Chinese)  
User and Reference Manuals L5  
(Japanese)  
User Manual (Russian)  
LR  
10–6  
THS710A, THS720A, THS730A & THS720P Service Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Mechanical Parts List  
Table 10–1: Replaceable standard accessories (Cont.)  
Tektronix Part Number or  
Instrument Options That  
Include the Accessory  
Nomenclature  
Description of Accessory  
070-9741-XX  
Replacement Reference  
Manual only (English)  
None  
None  
None  
None  
None  
None  
None  
None  
070-9742-XX  
070-9743-XX  
070-9744-XX  
070-9745-XX  
070-9746-XX  
070-9747-XX  
070-9748-XX  
Replacement Reference  
Manual only (French)  
Replacement Reference  
Manual only (German)  
Replacement Reference  
Manual only (Italian)  
Replacement Reference  
Manual only (Korean)  
Replacement Reference  
Manual only (Portuguese)  
Replacement Reference  
Manual only (Spanish)  
Replacement Reference  
Manual only (Simplified Chi-  
nese)  
070-9749-XX  
070-9799-XX  
Replacement Reference  
Manual only (Traditional  
Chinese)  
None  
None  
Replacement Reference  
Manual only (Japanese)  
10–7  
THS710A, THS720A, THS730A & THS720P Service Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Mechanical Parts List  
10–8  
THS710A, THS720A, THS730A & THS720P Service Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Download from Www.Somanuals.com. All Manuals Search And Download.  

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