Tektronix THS730A, THS710A, THS720P, THS720A User Manual

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Service Manual

THS710A, THS720A, THS730A & THS720P TekScope

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.

that in all previously published material. Specifications and price change privileges reserved. Printed in the U.S.A. T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000 TEKTRONIX and TEK are registered trademarks of T ektronix, Inc. T ek Secure is a registered trademark of Tektronix, Inc. T ekTools, TekScope, and IsolatedChannel are trademarks of Tektronix, Inc. Pursuant to DFARS 252.227-7013(e), T ektronix Inc. hereby grants to the Government a nonexclusive, paid-up license

throughout the world of the scope set forth therein for Government purposes for any commercial manuals provided by T ektronix Inc. under this contract.

WARRANTY

T ektronix 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 T ektronix distributor. If any such product proves defective during this warranty period, T ektronix, 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 T ektronix, with shipping charges prepaid. T ektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the T ektronix 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. T ektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by personnel other than T ektronix 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 CUST OMER 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.

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 T ektronix representative and provide the information below. Service Assurance may not be available in locations outside the United States of America.

Name VISA or Master Card number and expiration Company date or purchase order number Address Repair Protection (1,2, or 3 years) City , State, Postal code Calibration Services (1,2,3,4, or 5 years) Country Instrument model and serial number Phone Instrument purchase date

T o 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.

Specifications

Operating Information

Theory of Operation

General Safety Summary v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preface ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Related Manuals ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Conventions x. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Internal and External Power Sources 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Understanding the Front Panel 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connecting and Using the Probes 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Main Board 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inverter Board 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Display Module 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Switch Assembly 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance Verification

T est Record 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance Verification Procedures 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment Procedures

Required Equipment 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Overview of the Adjustment Process 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Accessing the Adjustment-Lockout Jumper 5–3. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Oscilloscope Adjustment 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Meter Adjustment 5–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replacing the Adjustment-Lockout Jumper 5–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance

Preparation 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preventing ESD 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inspection and Cleaning 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal and Installation Procedures 6–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting 6–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Unpacking and Repacking Instructions 6–40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

THS710A, THS720A, THS730A & THS720P Service Manual

Table of Contents

Options

Electrical Parts List

Diagrams

Mechanical Parts List

Options 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Parts List 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diagrams 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts Ordering Information 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using the Replaceable Parts List 10–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

THS710A, THS720A, THS730A & THS720P Service Manual

List of Figures

Table of Contents

Figure 2–1: Removing and replacing the battery 2–2. . . . . . . . . . . . . . . . .

Figure 2–2: AC adapter attachment 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–3: Typical scope-mode display 2–3. . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–4: Typical meter-mode display 2–4. . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–5: Connector locations 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3–1: Module-level block diagram 3–2. . . . . . . . . . . . . . . . . . . . . . .

Figure 5–1: Location of adjustment-lockout jumper 5–4. . . . . . . . . . . . . .

Figure 5–2: Oscilloscope adjustment setups 5–6. . . . . . . . . . . . . . . . . . . . .

Figure 5–3: Meter adjustment setups 5–9. . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 5–4: Relocating the adjustment-lockout jumper 5–11. . . . . . . . . . .

Figure 6–1: Removing the tilt stand 6–8. . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–2: Installing the tilt stand 6–9. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–3: Installing a new front-panel label 6–10. . . . . . . . . . . . . . . . . . .

Figure 6–4: Removing the battery door 6–12. . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–5: Assembling a new front cover 6–13. . . . . . . . . . . . . . . . . . . . . .

Figure 6–6: Installing the gasket 6–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–7: Installing the handle 6–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–8: Removing the display module 6–17. . . . . . . . . . . . . . . . . . . . . .

Figure 6–9: Opening the display cable connector 6–18. . . . . . . . . . . . . . . .

Figure 6–10: Routing cables to the inverter board 6–19. . . . . . . . . . . . . . .

Figure 6–11: Lifting the chassis 6–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–12: Foam pad and hole plug locations on the back cover 6–21. .

Figure 6–13: Routing the battery wires 6–22. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–14: Removing the main board and switch flex-circuit

assembly 6–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–15: Foam pad locations on the chassis 6–25. . . . . . . . . . . . . . . . . .

Figure 6–16: Reassembling the chassis 6–27. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–17: Battery connector location 6–29. . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–18: Bypassing the ON/STBY switch 6–31. . . . . . . . . . . . . . . . . . .

Figure 10–1: Exploded diagram 10–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

THS710A, THS720A, THS730A & THS720P Service Manual

iii

Table of Contents

List of Tables

Table 1–1: Oscilloscope specifications 1–1. . . . . . . . . . . . . . . . . . . . . . . . .

Table 1–2: DMM specifications 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 1–3: General specifications 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 5–1: Summary of oscilloscope adjustment steps 5–5. . . . . . . . . . . .

Table 5–2: Summary of meter adjustment steps 5–8. . . . . . . . . . . . . . . . .

Table 6–1: Internal inspection check list 6–3. . . . . . . . . . . . . . . . . . . . . . .

Table 6–2: Removal and installation procedures 6–6. . . . . . . . . . . . . . . . .

Table 7–1: TekScope instrument options 7–1. . . . . . . . . . . . . . . . . . . . . . .

Table 10–1: Replaceable standard accessories 10–6. . . . . . . . . . . . . . . . . . .

THS710A, THS720A, THS730A & THS720P Service Manual

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.

THS710A, THS720A, THS730A & THS720P Service Manual

General Safety Summary

Symbols and Terms

T erms 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.

T erms 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:

Battery Recycling

CAUTION

Refer to Manual

WARNING

High Voltage

Double

Insulated

Protective Ground

(Earth) Terminal

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 Rechargeable Battery Recycling Corp. (800) 227-7379 P.O. Box 141870 www.rbrc.com Gainesville, Florida 32614

THS710A, THS720A, THS730A & THS720P Service Manual

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.

THS710A, THS720A, THS730A & THS720P Service Manual

vii

Service Safety Summary

viii

THS710A, THS720A, THS730A & THS720P Service Manual

Preface

Related Manuals

This is the Service Manual for the THS710A, THS720A, THS730A, and THS720P TekScope instruments. This manual provides information to troubleshoot and repair the instrument to the module level.

Additional documentation for the instrument is contained in the related manuals listed below.

User Manual

Language

English 070-9731-XX 070-9741-XX 070-9751-XX French 070-9732-XX 070-9742-XX German 070-9733-XX 070-9743-XX Italian 070-9734-XX 070-9744-XX Korean 070-9735-XX 070-9745-XX Portuguese 070-9736-XX 070-9746-XX Spanish 070-9737-XX 070-9747-XX Simplified Chinese 070-9738-XX 070-9748-XX Traditional

Chinese Japanese 070-9740-XX 070-9799-00

Part Number

070-9739-XX 070-9749-XX

Reference Part Number

Programmer Manual Part Number

THS710A, THS720A, THS730A & THS720P Service Manual

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 mode or meter mode.

2. Press this button on the front panel.

3. Press this bezel button.

6. 7. —

8. 9. 10.

4. Press the bezel button again until this selection is highlighted.

5. Use the

the value for a parameter.

/– rocker to set

THS710A, THS720A, THS730A & THS720P Service Manual

Specifications

Sequence

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 The TekScope instrument must have been operating continuously for ten

minutes within the operating temperature range specified. H You must perform the Compensate Signal Path operation, accessible through

the utility menu, if the ambient temperature changes by more than 5° C.

T able 1–1: Oscilloscope specifications

Acquisition

Acquisition Modes Sample (Normal), Peak detect, Envelope, and Average Acquisition Rate,

typical

ingle

Inputs

Input Coupling DC, AC, or GND Input Impedance,

DC Coupled Maximum Voltag

Between Signal an Common at Input B

Up to 25 waveforms per second (2 channels, sample acquisition mode, MAG on, no measurements)

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 ∞

1 M ±1% in parallel with 25 pF ±2 pF

Overvoltage Category Maximum Voltage

CA T II Environment (refer to page 1–13)

CA T III Environment (refer to page 1–13)

For steady-state sinusoidal waveforms, derate at 20 dB/decade above 100 kHz to 13 V Category description on page 1–13.

at 3 MHz and above. Also, refer to Overvoltage

300 V

150 V

RMS

THS710A, THS720A, THS730A & THS720P Service Manual

1–1

Specifications

pe d d

Rise Time

T able 1–1: Oscilloscope specifications (Cont.)

Inputs

Maximum Voltage Between Common and Earth Ground at BNC

Maximum Voltage, Channel-to-Channel Commons

Channel-to-Channel Common Mode Rejection, typical

Channel-to-Channel Crosstalk, typical

Common to Chassis Capacitance, typical

Vertical

Number of Channels 2 Digitizers 8 bit resolution, separate digitizers for each channel sample

VOL TS/DIV Range 5 mV/div to 50 V/div at input BNC Polarity Normal and Invert Position Range ±10 divisions n Analog Bandwidth

at BNC, DC Coupl (typical at 5 mV/div, guaranteed at all other settings)

Peak Detect or Env lope Bandwidth, typical (25 MS/s or slower)

600 V

(CAT II) or 300 V

RMS

(CAT III), using rated connectors or

RMS

accessories 30 V

30 V

, 42.4 Vpk, using noninsulated connectors and acessories

RMS

, 42.4 Vpk, using noninsulated connectors and acessories

RMS

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

≥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 VOL TS/DIV and coupling settings on each channel

55 pF

simultaneously

THS710A THS720A THS720P THS730A

60 MHz at input BNC

100 MHz at input BNC

(90 MHz above 35° C)

100 MHz at input BNC

(90 MHz above 35° C)

THS710A THS720A THS720P THS730A

50 MHz

75 MHz 75 MHz 85 MHz

200 MHz at input BNC

(180 MHz above 35° C)

1–2

Analog Bandwidth

Selectable between 20 MHz or full

Limit, typical Lower Frequency

Limit, AC Coupled,

≤10 Hz at BNC, reduced by a factor of ten when using a 10X passive probe

typical

at BNC,

typical Peak Detect or Enve-

lope Pulse Response,

THS710A THS720A THS720P THS730A

5.8 ns

3.5 ns 3.5 ns 1.75 ns

Captures 50% or greater amplitude of pulses ≥ 8 ns wide (≥ 20 ns wide at 500 ns/div)

typical

THS710A, THS720A, THS730A & THS720P Service Manual

T able 1–1: Oscilloscope specifications (Cont.)

reme

forms

Sample Rate R

SEC/DIV R

Type

Vertical

DC Gain Accuracy ±2% for Sample or Average acquisition mode Position Accuracy ±[0.4% × |(position × volts/div)| + (0.1 div × volts/div)] n DC Measu

ccuracy, Averag Acquisition Mode Using ≥16 Wave-

DC Measurement Accuracy , Sample Acq. Mode, typical

Horizontal

Record Length 2500 samples for each channel

(including MAG)

n Sample Rate and Delay Time Accuracy

Delay Time Range Zero to 50 s

Internal Trigger

n Trigger Sensitivity, Edge Trigger (THS710A, THS720A, and THS720P)

n Trigger Sensitivity, Edge Trigger (THS730A)

ang

Measurement Type Accuracy Absolute voltage measurements ±[2% × |reading +

(position × volts/div)| + (0.1 div × volts/div)]

Delta voltage between any two waveforms acquired under same setup

±[2% × |reading + (position × volts/div)| + (0.15 div × volts/div) +

0.6 mV]

THS710A THS720A THS720P THS730A

5 S/s to 250 MS/s, in a

1.25, 2.5, 5 sequence

THS710A THS720A THS720P THS730A

10 ns/div to 50 s/div

±200 ppm over any ≥1 ms time interval

Coupling Sensitivity

DC 0.35 div from DC to 50 MHz,

Coupling Sensitivity

DC 0.35 div from DC to 50 MHz,

5 S/s to 500 MS/s, in a

1.25, 2.5, 5 sequence

5 ns/div to 50 s/div

±[2% × |reading| + (0.05 div × volts/div)]

5 S/s to 500 MS/s, in a

1.25, 2.5, 5 sequence

5 ns/div to 50 s/div

increasing to 1 div at 100 MHz (90 MHz above 35° C)

increasing to 1.5 div at 200 MHz (180 MHz above 35° C)

Specifications

5 S/s to 1 GS/s, in a 1.25, 2.5, 5 sequence

2 ns/div to 50 s/div

THS710A, THS720A, THS730A & THS720P Service Manual

1–3

Specifications

Type

T able 1–1: Oscilloscope specifications (Cont.)

Internal Trigger

igger Sensitivity, Edge Trigger typical

Trigger Level Range ±4 divisions from center of screen Motor Trigger Level

Range (THS720P) Trigger Level

Accuracy , typical SET LEVEL TO 50%,

typical Width Range, Pulse

Trigger T ype, typical Width Tolerance

Range, Pulse Trigger Type, typical

Sensitivity, Video Trigger T ype, typical

ignal Formats an

Field Rates, Video

igger

Holdoff Range 495 ns to 10 s

External Trigger

External Trigger , Maximum Input Voltage

External Trigger Coupling

External Trigger Levels

External Trigger Sensitivity

Coupling Sensitivity

NOISE REJ 3.5 times the DC-coupled limits HF REJ

LF REJ 1.5 times the DC-coupled limits

0.1 to 5 divisions from center screen, polarity depends on slope selection

±0.2 divisions, for signals having rise and fall times ≥20 ns

Operates with input signals ≥50 Hz

99 ns to 1 s, with resolution of 33 ns or approximately 1% of setting (whichever is greater)

5%, 10%, 15%, or 20%

Composite video signal with negative sync pulse amplitude from 0.6 to 2.5 divisions

Broadcast systems Supports NTSC, PAL, and

Interlaced Trigger on selected line of odd

Non-interlaced T rigger on selected line or any line Line Rates 15 kHz to 65 kHz, in five ranges

600 V

CAT II or 300 V

RMS

CAT III (refer to page 1–13)

RMS

DC only

+0.2 V or +2 V, selectable

500 mV

from DC to 1 MHz, increasing to 1 V

p-p

signal centered at selected trigger level

1.5 times the DC-coupled limit from DC to 30 kHz, attenuates signals above 30 kHz

for frequencies above 1 kHz, attenuates signals below 1 kHz

SECAM

field, selected line of even field, or any line

at 5 MHz, with

p-p

1–4

THS710A, THS720A, THS730A & THS720P Service Manual

Specifications

Amp

T able 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

Voltage and Current Harmonics (THS720P)

Number of Harmonics First 31 harmonics of signal with fundamental frequency between

Harmonics

litu

Accuracy

Harmonics Pha

ccurac

THD-F Measurement Total harmonic distortion relative to the fundamental amplitude

THD-F Accuracy ±4% THD-R Measurement Total harmonic distortion relative to the RMS amplitude

THD-R Accuracy ±4% Frequency Accuracy ±0.2% of reading

Power Measurements (THS720P)

True Power Measurement

Apparent Power Measurement

Reactive Power Measurement

Power Measurements

Accuracy

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

30 Hz and 450 Hz Accuracies below are stated as a percent of the fundamental amplitude

and are valid only if peak-to-peak amplitude is ≥4 divisions and number of averages ≥16

Fundamental 2 – 11 12 – 21 22 – 31 ±2.5% ±2.5% ±4% ±4% Fundamental 2 – 11 12 – 21 22 – 31 — ±4 ° ±8 ° ±8 °

THD-F 

THD-R 

W 







RMS

 V

RMS

Vn A



RMS



RMS

 A

measured over an integral number of cycles that contain n sample points

VA  V

VAR  (VA)2 W

RMS



 A

RMS

±4% at the BNCs (not including probe uncertainty)

THS710A, THS720A, THS730A & THS720P Service Manual

1–5

Specifications

DC Coupled

T able 1–1: Oscilloscope specifications (Cont.)

Power Measurements (THS720P)

PF Measurement

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  Power Factor Mea-

±0.05 surements Accuracy

With P6117 Probe

nalog Bandwidth,

THS710A THS720A THS720P THS730A

60 MHz 100 MHz

true p owe r

apparent power

100 MHz



200 MHz

Probe Attenuation 10X Maximum Voltag

Between Probe Ti and Reference Lead

Overvoltage Category Maximum Voltage

CA T II Environment (refer to

page 1–13)

CA T III Environment (refer to

page 1–13)

For steady-state sinusoidal waveforms, derate at 20 dB/decade above

900 kHz to 13 V

Category description on page 1–13. Maximum Voltage

30 V Between Reference Lead and Earth Ground Using P6117 Probe

Maximum Voltage,

30 V Channel-to-Channel Reference Leads Using P6117 Probe

RMS

, 42.4 V

(90 MHz above 35° C)

at 27 MHz and above. Also, refer to Overvoltage

(90 MHz above 35° C)

300 V

RMS

150 V

RMS

(180 MHz above 35° C)

1–6

THS710A, THS720A, THS730A & THS720P Service Manual

T able 1–1: Oscilloscope specifications (Cont.)

DC Coupled

Reference Lead

Reference

With P5102 Probe

nalog Bandwidth,

THS710A THS720A THS720P THS730A

60 MHz 100 MHz

100 MHz

Specifications

100 MHz

Probe Attenuation 10X Maximum Voltag

Between Probe Ti and Reference Lead,

Overvoltage Category Maximum Voltage

CA T II Environment (refer to page 1–13)

CA T III Environment (refer to page 1–13)

Maximum Voltag Between Probe Ti and AC Coupled

Maximum Voltag Between Lead and Earth Ground

Overvoltage Category Maximum Voltage

CA T II Environment ±1000 V

CA T III Environment

Overvoltage Category Maximum Voltage

CA T II Environment 600 V CA T III Environment 300 V

(90 MHz above 35° C)

1000 V

RMS

600 V

RMS

±600 V

RMS RMS

THS710A, THS720A, THS730A & THS720P Service Manual

1–7

Specifications

Res

T able 1–2: DMM specifications

General

Resolution 33⁄4 digit, 4000 count full scale reading except as noted Input Resistance, AC

or DC Voltage Input Capacitance,

AC or DC Voltage, typical

Maximum Voltag Between DMM an COM Inputs

Maximum Voltag Between DMM o COM Input and Earth

oun

DC Voltage

anges and

olution

n Accuracy ±(0.5% of reading + 5 counts) Normal Mode

Rejection, typical Common Mode

Rejection, typical

10 M ±10%

≤100 pF

Overvoltage Category Maximum Voltage

CA T I Environment (refer to

640 V

RMS

(880 VDC)

page 1–13)

CA T II Environment (refer to

600 V

RMS

page 1–13)

CA T III Environment (refer to

300 V

RMS

page 1–13)

Overvoltage Category Maximum Voltage

CA T I Environment (refer to

640 V

RMS

(880 VDC)

page 1–13)

CA T II Environment (refer to

600 V

RMS

page 1–13)

CA T III Environment (refer to

300 V

RMS

page 1–13)

Range Resolution

400.0 mV

0.1 mV

4.000 V 1 mV

40.00 V 10 mV

400.0 V 100 mV

880 V 1 V

Rejects AC signals by >60 dB at 50 Hz or 60 Hz (user selectable)

Rejects AC signals by >100 dB at 50 Hz or 60 Hz (user selectable)

1–8

THS710A, THS720A, THS730A & THS720P Service Manual

Specifications

Res

500

Res

Resis

reme

T able 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

anges and

olution

n Accurac (40 Hz to

Common Mode Rejection, typical

/Resistance

anges and

olution

n Accurac

Bias Voltage for Full

cale

Measu

Hz)

tanc nt, typical

Range Resolution

400.0 mV

4.000 V 1 mV

40.00 V 10 mV

400.0 V 100 mV 640 V 1 V

Input Waveform Maximum Error

Sinusoidal waveforms Nonsinusoidal waveforms with

crest factor up to 3 Rejects AC signals by >60 dB at DC, 50 Hz, and 60 Hz

Range Resolution

400.0 

4.000 k 1 

40.00 k 10 

400.0 k 100 

4.000 M 1 k

40.00 M 10 k

Range Maximum Error

All ranges except 40 M ±(0.5% of reading + 2 counts) 40 M ±(2% of reading + 5 counts) for

Range Full Scale Bias Voltage

400.0  350 mV

4.000 k

40.00 k 350 mV

400.0 k 350 mV

4.000 M 400 mV

40.00 M 1.10 V

0.1 mV

±(2% of reading + 5 counts) ±(4% of reading + 5 counts)

0.1 

≤60% relative humidity

200 mV

THS710A, THS720A, THS730A & THS720P Service Manual

1–9

Specifications

Open Cir

T able 1–2: DMM specifications (Cont.)

/Resistance

cuit Voltage,

typical

Continuity Check

Indication An audible tone is generated when measured resistance is below 50 ,

Open Circuit Voltage, typical

Test Current, typical 1 mA

Diode Check

Range Zero to 2 V, measures forward voltage drop of semiconductor junction Voltage Accuracy,

typical Open Circuit Voltage,

typical Test Current, typical 1 mA

Data Logger

Horizontal Scale Range

Vertical Zoom Range 2X, 5X, or 10X

Range Open Circuit Voltage

400.0 

All other ranges ≤1.2 V

typical

4 V

±25%

4 V

30 s/div to 24 hours/div (4 minutes to 8 days, full scale)

4.8 V

1–10

T able 1–3: General specifications

Display

Display Type 4.7 in (120 mm) diagonal liquid crystal Display Resolution 320 horizontal by 240 vertical pixels Display Contrast Adjustable, temperature compensated Backlight Intensity,

typical

35 cd/m

THS710A, THS720A, THS730A & THS720P Service Manual

Specifications

ery Char

T able 1–3: General specifications (Cont.)

RS-232 Interface

Device Type DTE. at RJ-45 connector Pinout Signal Pin Number at

9-pin Null Modem Adapter

RTS out 1 8 TXD out 2 6 RXD in 3 5 GND 5 4 DTR out 6 3 CTS in 7 7 RTS out 8 8 DSR in (not used) 4 2 DCD in (not used) 7 1

Probe Compensator Output

Output Voltage, typical

Frequency, typical 1.2 kHz

Power Source

Battery Replaceable Ni-Cd battery pack Battery Life, typical Approximately two hours of continuous use from a full charge Low Battery Indica-

tion, typical Battery Saver Standby Time-out and Backlight Time-out extend battery life. Time-out

Batt Time, typical

External Power 12 VDC nominal, center positive; Operates with input from 10 VDC to

ging

5.0 V into ≥1 M load

Low battery message first appears approximately ten minutes before the instrument powers off automatically

ranges from 1 minute to 15 minutes, or off. With T ekScope instrument operat-

ing With T ekScope instrument turned

off In external charger 1.5 hours

15 VDC

9 hours

Pin Number at RJ-45 Connector

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

Fuse This instrument has no user-replaceable fuses

All memory is retained indefinitely with battery removed and without external power applied.

THS710A, THS720A, THS730A & THS720P Service Manual

1–11

Specifications

Temper

Random Size

T able 1–3: General specifications (Cont.)

Environmental

atu

Humidit

ltitu

Vibration Operating 2.66 g

Drop Resistance, typical

Moisture Resistance Meets IEC529, IP43 with DC input hole plug, I/O port hole plug, and

Mechanical

ight With battery installed 3.2 lbs (1.5 kg)

Adjustment Interval

The recommended adjustment interval is one year

Operating –10° C to +50° C

Nonoperating –20° C to +60° C

+40° C or below ≤95% relative humidity

+41° C to +50° C ≤75% relative humudity

Operating 2,000 m

Nonoperating 15,000 m

from 5 Hz to 500 Hz,

RMS

10 minutes on each axis

Nonoperating 3.48 g

10 minutes on each axis

Survives a 30 in (76 cm) drop onto concrete with only cosmetic damage

battery door installed.

Height 8.53 in (217 mm)

Width 6.95 in (177 mm)

Depth 2.00 in (50.8 mm)

With all standard accessories in

soft carry case

When packaged for domestic

shipment

7.5 lbs (3.4 kg)

9.0 lbs (4.1 kg)

from 5 Hz to 500 Hz,

RMS

1–12

THS710A, THS720A, THS730A & THS720P Service Manual

Specifications

Over

T able 1–3: General specifications (Cont.)

Certifications and Compliances

Certifications Listed UL31 11-1 and CAN/CSA-C22.2 No. 1010.1-92, complies with

EN61010-1/A2

voltage CategoryCategory Examples

CA T 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.

CA T II 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.

CA T I A typical CAT II environment is

circuitry inside electrical or electronic 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:

EN 55011 Class A: Radiated and Conducted Emissions

EN 50081–1 Emissions:

EN 50082–1 Immunity:

EN 61010–1 Safety

Tektronix-supplied ferrite bead required on instrument end of RS-232 cable

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

THS710A, THS720A, THS730A & THS720P Service Manual

EN 60555–2 Power Harmonics

IEC 801–2 Electrostatic Discharge IEC 801–3 RF Radiated

IEC 801–4 Fast Transients IEC 801–5 Surge

1–13

Specifications

1–14

THS710A, THS720A, THS730A & THS720P Service Manual

Operating Information

This chapter provides a quick overview of the following topics:

H Internal and external power sources H Understanding the front panel H 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

Battery pack in TekScope instrument 9 hours 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.

THS710A, THS720A, THS730A & THS720P Service Manual

2–1

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

2–2

Figure 2–2: AC adapter attachment

THS710A, THS720A, THS730A & THS720P Service Manual

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.

Operator Information

Using Scope Mode

Press the front-panel SCOPE button to enter scope mode. Then, press AUTORANGE 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

Waveform readout lines

Measurement readout area

Figure 2–3: Typical scope-mode display

THS710A, THS720A, THS730A & THS720P Service Manual

2–3

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

THS710A, THS720A, THS730A & THS720P Service Manual

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.

THS710A, THS720A, THS730A & THS720P Service Manual

2–5

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.

2–6

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.

THS710A, THS720A, THS730A & THS720P Service Manual

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.

16 15

87910111213

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.

THS710A, THS720A, THS730A & THS720P Service Manual

2–7

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

Figure 2–5: Connector locations

Side panel

2–8

THS710A, THS720A, THS730A & THS720P Service Manual

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.

THS710A, THS720A, THS730A & THS720P Service Manual

2–9

Operator Information

Attaching the Reference

Leads Correctly

Beware of High Voltages

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.

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

THS710A, THS720A, THS730A & THS720P Service Manual

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

Meter Signal Path

Processor System

Display System

Power Supply

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.

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.

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.

THS710A, THS720A, THS730A & THS720P Service Manual

3–1

Theory of Operation

Display Module

Switch Assembly

The display module consists of a liquid crystal display (LCD), a display driver, and a flourescent backlight.

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.

Battery

Adjustment-

lockout

Not used

EXT

PWR

CH 1 CH 2

Main board

J7 J6

PROBE

COMP

RS-232

COM

DMM

3–2

Inverter boardDisplay assembly Switch assembly

Figure 3–1: Module-level block diagram

THS710A, THS720A, THS730A & THS720P Service Manual

Performance Verification

Wavetek 9100 U

ers

5500A

-prod

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.

Description

DC Voltage Source 60 mV to 800 V, ±0.1% accu-

AC Voltage Source 300 mV to 640 V, ±0.5%

Resistance Standard 360  to 36 M, ±0.1%

Leveled Sine Wave Generator 50 kHz and 100 MHz, ±3%

Time Mark Generator 10 ms period, ±50 ppm accu-

Minimum Requirements

racy

accuracy at 500 Hz

accuracy

amplitude accuracy

racy

Examples

niv

al Calibration System with Oscilloscope Calibration Modul (Option 250)

luke

Calibrator with Oscilloscope

alibration Option (Option

5500A-SC)

Multi

uct

Banana to Banana Cable (two required)

50  BNC Cable BNC male to BNC male,

50  Feedthrough Termination

Dual Banana to BNC Adapter Banana plugs to BNC female Tektronix part number

Shielded banana jacks on each end

≈ 36 in (1 m) long BNC male and female con-

nectors

Tektronix Deluxe Meter Lead Set (ATLDX1)

Tektronix part number 012-0482-00

Tektronix part number 01 1-0049-01

103-0090-00

THS710A, THS720A, THS730A & THS720P Service Manual

4–1

Performance Verification

re-

Test Record

Serial Number

Test Passed Failed

Self Test

Oscilloscope Tests Low Limit Test Result High Limit

hannel 1 DC Measu

nt Accurac

Procedure Performed by Date

5 mV/div 34.05 mV 35.95 mV 500 mV/div 3.405 V 3.595 V 2 V/div 13.62 V 14.38 V 10 V/div 68.1 V 71.9 V

hannel 2 DC Measu

nt Accurac

Channel 1 Bandwidth 425 mV — Channel 2 Bandwidth 425 mV — Sample Rate and Delay Time Accuracy –4 divs +4 divs Channel 1 Edge Trigger Sensitivity Stable trigger — Channel 2 Edge Trigger Sensitivity Stable trigger —

5 mV/div 34.05 mV 35.95 mV 500 mV/div 3.405 V 3.595 V 2 V/div 13.62 V 14.38 V 10 V/div 68.1 V 71.9 V

4–2

THS710A, THS720A, THS730A & THS720P Service Manual

Performance Verification

Resis

DMM Tests Low Limit Test Result High Limit

Voltage Accurac

400 mV range, 60 mV input

59.2 mV 60.8 mV

Voltage Accurac

tance Accurac

400 mV range, 360 mV input

4 V range 3.577 V 3.623 V 40 V range 35.77 V 36.23 V 400 V range 357.7 V 362.3 V 880 V range 783 V 801 V 400 mV range 352.3 mV 367.7 mV 4 V range,

600 mV input 4 V range,

3.6 V input 40 V range 35.23 V 36.77 V 400 V range 352.3 V 367.7 V 640 V range 559 V 593 V 400  range 358.0  362.0  4 k range 3.580 k 3.620 k 40 k range,

6 k input 40 k range,

36 k input

357.7 mV 362.3 mV

0.583 V 0.617 V

3.523 V 3.677 V

5.95 k 6.05 k

35.80 k 36.20 k

400 k range 358.0 k 362.0 k 4 M range 3.580 M 3.620 M 40 M range 35.23 M 36.77 M

THS710A, THS720A, THS730A & THS720P Service Manual

4–3

Performance Verification

SCOPEUTILITY

—

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 The TekScope instrument must have been operating continuously for ten

minutes within the operating temperature range specified.

H 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 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

THS710A, THS720A, THS730A & THS720P Service Manual

Performance Verification

SCOPEUTILITY

—

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 Loop Once Execute OK Run Test

A dialog box displays the result when the self test completes. Press the CLEAR MENU button to continue operation.

THS710A, THS720A, THS730A & THS720P Service Manual

4–5

Performance Verification

SCOPESA

—

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:

VE/

RECALL

CH 1 — VERTICAL

MENU ACQUIRE Mode Average Set to 16 ME

* You may need to press Select Page to display this selection.

Recall Saved Setup

OK Recall Factory

Probe Type Voltage Probe Set to 1X

Select Measrmnt Mean* OK Select

Measrmnt

Recall Factory Setup

—

3. Connect the TekScope instrument to the DC voltage source as shown below.

DC voltage

source

+–

Dual banana to bnc adapter

BNC cable

Ch 1

4–6

THS710A, THS720A, THS730A & THS720P Service Manual

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 V

pos

b. Reverse the polarity of the DC voltage source and then record the mean

measurement as V

neg

c. Calculate V

diff

= V

pos

– V

and then compare V

neg

to the accuracy

diff

limits in the table.

DC Voltage Source Output

VOL TS/DIV Setting

5 mV/div +17.5 mV, –17.5 mV 34.05 mV to 35.95 mV 500 mV/div +1.75 V, –1.75 V 3.405 V to 3.595 V 2 V/div +7.00 V, –7.00 V 13.62 V to 14.38 V 10 V/div +35.0 V, –35.0 V 68.1 V to 71.9 V

Levels

Accuracy Limits for V

diff

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.

THS710A, THS720A, THS730A & THS720P Service Manual

4–7

Performance Verification

SCOPESA

—

Check Oscilloscope

Channel 1 Bandwidth

This test checks the bandwidth of channel 1.

1. Set up the TekScope instrument using the following steps:

VE/

RECALL

ACQUIRE Mode Average Set to 16 TRIGGER Coupling Noise Reject — ME

* You may need to press Select Page to display this selection.

Recall Saved Setup

OK Recall Factory

Gating & High-Low Setup

Select Measrmnt Pk-Pk* OK Select

Measrmnt

Recall Factory Setup

—

High-Low Method Min/Max

—

2. Connect the TekScope instrument to the leveled sine wave generator as

shown below.

Leveled sine wave generator

Output

BNC cable

50  feedthrough

terminator

Ch 1

4–8

THS710A, THS720A, THS730A & THS720P Service Manual

Performance Verification

3. Set the TekScope instrument VOLTS/DIV to 100 mV/div.

4. Set the TekScope instrument SEC/DIV to 10 s/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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4–9

Performance Verification

SCO

———

—

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:

* You may need to press Select Page to display this selection.

CH 1 WAVEFORM

OFF CH 2 TRIGGER Trigger Source Ch2 ME

Gating & High-Low Setup

Select Measrmnt Pk-Pk* OK Select

Measrmnt

High-Low Method Min/Max

—

2. Connect the TekScope instrument to the leveled sine wave generator as

shown below.

Leveled sine wave generator

Output

BNC cable

50  feedthrough

terminator

Ch 2

4–10

THS710A, THS720A, THS730A & THS720P Service Manual

Performance Verification

3. Set the TekScope instrument VOLTS/DIV to 100 mV/div.

4. Set the TekScope instrument SEC/DIV to 10 s/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.

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Performance Verification

SCOPESA

—

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:

VE/

RECALL

VERTICAL MENU

Recall Saved Setup

OK Recall Factory

Probe Type Voltage Probe Set to 1X

Recall Factory Setup

—

2. Connect the TekScope instrument to the time mark generator as shown

below.

Time mark

generator

50  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

THS710A, THS720A, THS730A & THS720P Service Manual

Performance Verification

SCO

—

SCO

6. Press SET LEVEL TO 50%.

7. Press MAG.

8. Change the TekScope instrument setup using the following steps:

HORIZONTAL MENU

CLEAR MENU

Time Base Delayed Runs After

Main

— —

9. Set the delayed time base SEC/DIV to 50 ms/div.

10. Change the TekScope instrument setup using the following steps:

HORIZONTAL MENU

CLEAR MENU

Time Base Delayed Runs After

Main

— — —

Set delay time to 10 ms

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.

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4–13

Performance Verification

SCOPESA

—

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:

VE/

RECALL

ACQUIRE Mode Average Set to 16 TRIGGER Mode Normal — ME

* You may need to press Select Page to display this selection.

Recall Saved Setup

OK Recall Factory

Gating & High-Low Setup

Select Measrmnt Ampl* OK Select

Measrmnt

Recall Factory Setup

—

High-Low Method Min/Max

—

2. Connect the TekScope instrument to the leveled sine wave generator as

shown below.

Leveled sine wave generator

Output

BNC cable

50  feedthrough

terminator

Ch 1

4–14

THS710A, THS720A, THS730A & THS720P Service Manual

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 mV

p-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.

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4–15

Performance Verification

SCO

———

—

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:

* You may need to press Select Page to display this selection.

CH 1 WAVEFORM

OFF CH 2 TRIGGER Trigger Source Ch2 ME

Gating & High-Low Setup

Select Measrmnt Ampl* OK Select

Measrmnt

High-Low Method Min/Max

—

2. Connect the TekScope instrument to the leveled sine wave generator as

shown below.

Leveled sine wave generator

Output

BNC cable

50  feedthrough

terminator

Ch 2

4–16

THS710A, THS720A, THS730A & THS720P Service Manual

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 mV

p-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.

THS710A, THS720A, THS730A & THS720P Service Manual

4–17

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

THS710A, THS720A, THS730A & THS720P Service Manual

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

Range

400 mV 60 mV 59.2 mV to 60.8 mV 400 mV 360 mV 357.7 mV to 362.3 mV 4 V 3.6 V 3.577 V to 3.623 V 40 V 36 V 35.77 V to 36.23 V 400 V 360 V 357.7 V to 362.3 V 880 V 792 V 783 V to 801 V

Output Level

Accuracy Limits

5. Set the DC voltage source output level to 0 V.

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4–19

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

4–20

THS710A, THS720A, THS730A & THS720P Service Manual

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

Range

400 mV 360 mV 352.3 mV to 367.7 mV 4 V 600 mV 0.583 V to 0.617 V 4 V 3.6 V 3.523 V to 3.677 V 40 V 36 V 35.23 V to 36.77 V 400 V 360 V 352.3 V to 367.7 V 640 V 576 V 559 V to 593 V

Output Level

Accuracy Limits

6. Set the AC voltage source output level to 0 V.

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4–21

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 —  —

2. Connect the TekScope instrument to the resistance standard as shown below.

Resistance

standard

Banana cables

4–22

THS710A, THS720A, THS730A & THS720P Service Manual

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

Range

400  360  358.0  to 362.0  4 k 3.6 k 3.580 k to 3.620 k 40 k 6 k 5.95 k to 6.05 k 40 k 36 k 35.80 k to 36.20 k 400 k 360 k 358.0 k to 362.0 k 4 M 3.6 M 3.580 M to 3.620 M 40 M* 36 M* 35.23 M to 36.77 M

* These limits apply only when the relative humidity is ≤ 60%.

Setting

Accuracy Limits

This completes the performance verification procedure.

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4–23

Performance Verification

4–24

THS710A, THS720A, THS730A & THS720P Service Manual

Adjustment Procedures

Wavetek 9100 U

ers

5500A

-prod

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 procedure 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

Description

DC Voltage Source 400 mV to 800 V, ±0.1%

AC Voltage Source 400 mV to 600 V, ±0.5%

Resistance Standard 100 W to 10 MW, ±0.1%

Fast-Rise Square Wave Generator

Banana to Banana Cable (two required)

50 W BNC Cable BNC male to BNC male,

50 W Feedthrough Termination

Requirements

accuracy

accuracy at 500 Hz

accuracy 300 mV step, ≤20 ns risetime,

≤0.5% flattness from 500 ns to 200 ms, 500 Hz or 950 Hz, nominal 50% duty cycle

Shielded banana jacks on each end

≈ 36 in (1 m) long

≈ 10 in (25 cm) long

BNC male and female connectors

Examples

niv

al Calibration System with Oscilloscope Calibration Modul (Option 250)

luke

Calibrator with Oscilloscope

alibration Option (Option

5500A-SC)

Tektronix Deluxe Meter Lead Set (ATLDX1)

Tektronix part number 012-0482-00

Tektronix part number 012-0208-00

Tektronix part number 01 1-0049-01

Multi

uct

THS710A, THS720A, THS730A & THS720P Service Manual

5–1

Adjustment Procedures

Minimum

Description Examples

Dual Banana to BNC Adapter Banana plugs to BNC female Tektronix part number

Requirements

103-0090-XX

BNC T One male and two female

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.

BNC connectors

Tektronix part number 103-0030-XX

5–2

Before performing adjustment procedures, you must warm up the instrument at least ten minutes in an ambient temperature between 20° C and 30° C. Adjustments 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.

THS710A, THS720A, THS730A & THS720P Service Manual

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).

Adjustment Procedures

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.

THS710A, THS720A, THS730A & THS720P Service Manual

5–3

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.

5–4

THS710A, THS720A, THS730A & THS720P Service Manual

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.

T able 5–1: Summary of oscilloscope adjustment steps

Step Uses Equipment Setup Signal Source Setting

1 Square wave generator setup Fast rise output, 300 mV

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).

amplitude,

500 Hz or 950 Hz frequency

p-p

2 Zero voltage setup None 5 DC voltage setup +7.000 V 6 DC voltage setup –7.000 V 7 DC voltage setup +700.0 mV 8 DC voltage setup –700.0 mV 9 DC voltage setup +70.00 mV 10 DC voltage setup –70.00 mV

THS710A, THS720A, THS730A & THS720P Service Manual

5–5

Adjustment Procedures

Square wave generator setup

Fast rise square wave generator

Output

36 inch BNC cable

Zero voltage setup

BNC ‘T’ connector

10 inch BNC cable

Ch 1

10 inch BNC cable

Ch 1

50  feedthrough terminator

Ch 2

50  feedthrough terminator

Ch 2

5–6

DC voltage setup

DC voltage

source

BNC ‘T’ connector

+–

Dual banana to bnc adapter

36 inch BNC cable

Figure 5–2: Oscilloscope adjustment setups

THS710A, THS720A, THS730A & THS720P Service Manual

10 inch BNC cable

Ch 1

Ch 2

Adjustment Procedures

SCOPEUTILITY

—

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 mV

and 300 mV

p-p

, and frequency between 450 Hz and 950 Hz

p-p

(inclusive).

4. Use the TekScope instrument setup below to start the oscilloscope adjustment 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 Factory Scope OK Factory Cal Scope

Completing the

Adjustment Process

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.

After adjusting the oscilloscope, continue with one of the following steps: H Proceed to Meter Adjustment on page 5–8 to adjust the meter voltage

references.

H Proceed to Replacing the Adjustment-Lockout Jumper on page 5–11 to

protect the instrument from inadvertent readjustment.

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5–7

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.

T able 5–2: Summary of meter adjustment steps

Step Uses Equipment Setup Signal or Resistance Source Setting

1 DC voltage setup +400.0 mV 2 DC voltage setup 4.000 V 3 DC voltage setup 40.00 V 4 DC voltage setup 400.0 V 5 DC voltage setup 850.0 V 6 AC voltage setup 400.0 mV 7 AC voltage setup 4.000 V 8 AC voltage setup 40.00 V 9 AC voltage setup 400.0 V 10 AC voltage setup 600.0 V

RMS RMS RMS RMS RMS

, 500 Hz , 500 Hz , 500 Hz , 500 Hz , 500 Hz

11 Resistance standard setup 100.0  12 Resistance standard setup 1.000 k 13 Resistance standard setup 10.00 k 14 Resistance standard setup 100.0 k 15 Resistance standard setup 1.000 M 16 Resistance standard setup 10.00 M 17 DC voltage setup 18 DC voltage setup

In steps 17 and 18, the DC voltage source must be able to sink approximately 1 mA

1 1

500.0 mV

1.000 V

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



DC voltage source cannot sink current, you can connect a 470 ,

W shunt

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.

5–8

THS710A, THS720A, THS730A & THS720P Service Manual

DC voltage setup

AC voltage setup

Adjustment Procedures

DC voltage

source

+–

Banana cables

AC voltage

source

Banana cables

Resistance standard setup

Banana cables

Figure 5–3: Meter adjustment setups

Resistance

standard

THS710A, THS720A, THS730A & THS720P Service Manual

5–9

Adjustment Procedures

UTILITY

—

Meter Adjustment

Procedure

After removing the adjustment-lockout jumper, use this procedure to adjust the meter voltage references.

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.

METE

System Cal 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.

Completing the

Adjustment Process

If the procedure completes successfully, a “Pass” message is displayed and the new adjustment takes effect.

After adjusting the meter, continue with one of the following steps: H Return to Oscilloscope Adjustment on page 5–5 to adjust the oscilloscope

voltage references.

H Proceed to Replacing the Adjustment-Lockout Jumper on page 5–11 to

protect the instrument from inadvertent readjustment.

5–10

THS710A, THS720A, THS730A & THS720P Service Manual

Replacing the Adjustment-Lockout Jumper

After you complete the adjustment process, you should reinstall the adjustmentlockout 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 Procedures

Adjustment-lockout

jumper position

Figure 5–4: Relocating the adjustment-lockout jumper

This completes the adjustment procedure.

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5–11

Adjustment Procedures

5–12

THS710A, THS720A, THS730A & THS720P Service Manual

Maintenance

This chapter contains the information needed to do periodic and corrective maintenance on the TekScope instrument. The following sections are included:

H Preparation refers you to important information contained elsewhere in this

manual.

H Preventing ESD provides general information on preventing damage to

internal modules when doing maintenance.

H Inspection and Cleaning provides procedures for inspecting the TekScope

instrument and cleaning its external and internal modules.

H Removal and Installation Procedures provide procedures for the removal and

installation of modules.

H Troubleshooting provides information for isolating failed modules. H Unpacking and Repacking Instructions provides packaging information for

shipment or storage.

Preparation

Preventing ESD

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.

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.

THS710A, THS720A, THS730A & THS720P Service Manual

6–1

Maintenance

Inspection and Cleaning

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.

This section describes how to inspect for dirt and damage, and how to clean the TekScope instrument. Inspection and cleaning are done as preventive maintenance. Preventive maintenance, when done regularly, may prevent malfunctions and enhance reliability.

General Care

Inspection and Cleaning

Procedures

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.

Protect the TekScope instrument from adverse weather conditions. The instrument 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.

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 instrument failure, especially under high-humidity conditions.

that could cause an

6–2

THS710A, THS720A, THS730A & THS720P Service Manual

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.

T able 6–1: Internal inspection check list

Item Inspect For Repair Action

Front and Back Cover

Hole Plugs, Gasket and Foam Pads

Circuit boards Loose, broken, or corroded solder

Cracks or deformations. Scratched lettering or display filter. Loose connectors or labels.

Misplaced or missing pieces. Relocate or replace defective

connections. Burned circuit boards. Burned, broken, or cracked circuit-run plating.

Repair or replace defective hardware.

pieces. Remove failed module and replace

with a new module.

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Maintenance

T able 6–1: Internal inspection check list (Cont.)

Item Repair ActionInspect For

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 cottontipped 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.

6–4

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 instrument.

THS710A, THS720A, THS730A & THS720P Service Manual

Removal and Installation Procedures

This section describes how to remove and install the major mechanical and electrical modules. It provides the following information:

H List of Modules on page 6–5 describes where to locate a list of replaceable

modules.

H Summary of Procedures on page 6–6 lists the procedures for removal and

installation of modules.

H Tools Required on page 6–7 describes the tools needed to perform the

procedures.

H Tilt Stand, on page 6–8, begins a series of procedures that describe the

removal and installation of modules.

Maintenance

Preparation

List of Modules

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.

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.

THS710A, THS720A, THS730A & THS720P Service Manual

6–5

Maintenance

Summary of Procedures

Table 6–2 lists the removal and installation procedures in order of increasing complexity.

T able 6–2: Removal and installation procedures

Procedure Modules Accessed Begins on Page

Tilt Stand Tilt stand 6–8 Front-Panel Label Front-panel label 6–10 Front Cover Front cover

Display shield Switch mat Gasket Handle Battery door Screws

Display Module Display module

Inverter board

Back Cover DC power hole plug

6–1 1

6–16

6–19 I/O port hole plug Back cover / back label / battery contact

assembly

Complete Disassembly Chassis / BNC connectors / banana jacks

Main board Switch flex-circuit assembly Display cable Inverter board cable Foam pad set

Some pieces in the foam pad set are accessed by the Front Cover and Back Cover procedures.

6–23

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 Torque-limiting screwdriver, 12 in ⋅ lb (1.3 N ⋅ m) range with Torx T-15 tip H Screwdriver with H Screwdriver with

inch flat blade

H Needle-nose pliers H Sharp knife (X-ACTO knife or equivalent)

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6–7

Maintenance

Tilt Stand

You will need a

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

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.

6–8

Figure 6–1: Removing the tilt stand

THS710A, THS720A, THS730A & THS720P Service Manual

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.

Insert hinge pin into the socket.

Rotate the tilt stand to slide the second hinge pin into its socket.

Figure 6–2: Installing the tilt stand

THS710A, THS720A, THS730A & THS720P Service Manual

6–9

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

THS710A, THS720A, THS730A & THS720P Service Manual

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.

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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

THS710A, THS720A, THS730A & THS720P Service Manual

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

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 (

inch) tail through the slot. Carefully press the gasket

into place around the rim with the finish the installation, overlap the starting point and then pass the end of the gasket through the remaining slot. Trim the ending tail to length with the sharp knife.

THS710A, THS720A, THS730A & THS720P Service Manual

Front cover

inch flat-bladed screwdriver. To

inch

6–13

Maintenance

Gasket material

Front cover

Trim tails to

Overlap gasket material

inch

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.

6–14

7. Holding the case together, pick it up and place it front side down on a soft

surface.

THS710A, THS720A, THS730A & THS720P Service Manual

Velcro strip

Maintenance

Fold end of handle over

Figure 6–7: Installing the handle

THS710A, THS720A, THS730A & THS720P Service Manual

6–15

Maintenance

Display Module

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.

You will need a

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

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.

6–16

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.

THS710A, THS720A, THS730A & THS720P Service Manual

Display cable connector

Maintenance

Display module

Inverter board

Spring

Switch flex-circuit board

Figure 6–8: Removing the display module

c. Using the

inch flat-bladed screwdriver, carefully open the display-

cable connector as shown in Figure 6–9.

d. When the connector is open, slip the display cable out of the connector

to free the display module.

THS710A, THS720A, THS730A & THS720P Service Manual

6–17

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

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.

6–18

10. Install the switch mat and front cover using the procedure on page 6–12.

THS710A, THS720A, THS730A & THS720P Service Manual

Tektronix THS730A, THS710A, THS720P, THS720A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Service Manual

Table of Contents

Specifications

Operating Information

Theory of Operation

Performance Verification

Adjustment Procedures

Maintenance

Options

Electrical Parts List

Diagrams

Mechanical Parts List

List of Figures

List of Tables

General Safety Summary

Service Safety Summary

Preface

Related Manuals

Conventions

Specifications

Operating Information

Internal and External Power Sources

Understanding the Front Panel

Connecting and Using the Probes

Theory of Operation

Main Board

Inverter Board

Display Module

Switch Assembly

Performance Verification

Test Record

Performance Verification Procedures

Adjustment Procedures

Required Equipment

Overview of the Adjustment Process

Accessing the Adjustment-Lockout Jumper

Oscilloscope Adjustment

Meter Adjustment

Replacing the Adjustment-Lockout Jumper

Maintenance

Preparation

Preventing ESD

Inspection and Cleaning

Removal and Installation Procedures