Tektronix THS 710A, THS 720A, THS 730A, THS 720P TekScope Service Manual

Service Manual
THS710A, THS720A,
THS730A & THS720P
TekScope
070-9752-00
This document applies to to serial number
B010100 and above and firmware version 1.00
and above.
First printing: November 1996
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.
Copyright E Tektronix, Inc. All rights reserved.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
Tek Secure is a registered trademark of Tektronix, Inc.
TekTools, TekScope, and IsolatedChannel are trademarks of Tektronix, Inc.
Pursuant to DFARS 252.227-7013(e), Tektronix 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
Tektronix Inc. under this contract.
WARRANTY
Tektronix warrants that this product will be free from defects in materials and workmanship for a period of three (3) years
from the date of purchase from an authorized Tektronix distributor. If any such product proves defective during this
warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will
provide a replacement in exchange for the defective product. Batteries are excluded from this warranty.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for
packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid.
Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the
Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any
other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair
damage resulting from improper use or connection to incompatible equipment; or c) to service a product that has been
modified or integrated with other products when the effect of such modification or integration increases the time or
difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY
OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX
AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
Service Assurance
If you have not already purchased Service Assurance for this product, you may do so at any time during the product’s
warranty period. Service Assurance provides Repair Protection and Calibration Services to meet your needs.
Repair Protection extends priority repair services beyond the product’s warranty period; you may purchase up to three
years of Repair Protection.
Calibration Services provide annual calibration of your product, standards compliance and required audit documentation,
recall assurance, and reminder notification of scheduled calibration. Coverage begins upon registration; you may purchase
up to five years of Calibration Services.
Service Assurance Advantages
H Priced well below the cost of a single repair or calibration
H Avoid delays for service by eliminating the need for separate purchase authorizations from your company
H Eliminates unexpected service expenses
For Information and Ordering
For more information or to order Service Assurance, contact your local Tektronix representative and provide the information below. Service Assurance may not be available in locations outside the United States of America.
Name
Company
Address
City, State, Postal code
Country
Phone
VISA or Master Card number and expiration
date or purchase order number
Repair Protection (1,2, or 3 years)
Calibration Services (1,2,3,4, or 5 years)
Instrument model and serial number
Instrument purchase date
To learn the location of your nearest Tektronix representative, please call 1-800-TEK-WIDE in North America,
1-503-627-7111 elsewhere, or look us up on the World Wide Web at http://www.tek.com.
Table of Contents
General Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
v
vii
ix
Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ix
x
Specifications
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–1
Internal and External Power Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Understanding the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting and Using the Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1
2–3
2–8
Main Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inverter Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switch Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1
3–1
3–2
3–2
Operating Information
Theory of Operation
Performance Verification
Test Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–2
4–4
Adjustment Procedures
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview of the Adjustment Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessing the Adjustment-Lockout Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oscilloscope Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Meter Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Adjustment-Lockout Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5–1
5–2
5–3
5–5
5–8
5–11
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventing ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal and Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking and Repacking Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6–1
6–1
6–2
6–5
6–28
6–40
Maintenance
THS710A, THS720A, THS730A & THS720P Service Manual
i
Table of Contents
Options
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7–1
Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–1
Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9–1
Parts Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10–1
10–2
Electrical Parts List
Diagrams
Mechanical Parts List
ii
THS710A, THS720A, THS730A & THS720P Service Manual
Table of Contents
List of Figures
Figure 2–1: Removing and replacing the battery . . . . . . . . . . . . . . . . .
Figure 2–2: AC adapter attachment . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–3: Typical scope-mode display . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–4: Typical meter-mode display . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–5: Connector locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2
2–2
2–3
2–4
2–8
Figure 3–1: Module-level block diagram . . . . . . . . . . . . . . . . . . . . . . .
3–2
Figure 5–1: Location of adjustment-lockout jumper . . . . . . . . . . . . . .
Figure 5–2: Oscilloscope adjustment setups . . . . . . . . . . . . . . . . . . . . .
Figure 5–3: Meter adjustment setups . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–4: Relocating the adjustment-lockout jumper . . . . . . . . . . .
5–4
5–6
5–9
5–11
Figure 6–1: Removing the tilt stand . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–2: Installing the tilt stand . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–3: Installing a new front-panel label . . . . . . . . . . . . . . . . . . .
Figure 6–4: Removing the battery door . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–5: Assembling a new front cover . . . . . . . . . . . . . . . . . . . . . .
Figure 6–6: Installing the gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–7: Installing the handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–8: Removing the display module . . . . . . . . . . . . . . . . . . . . . .
Figure 6–9: Opening the display cable connector . . . . . . . . . . . . . . . .
Figure 6–10: Routing cables to the inverter board . . . . . . . . . . . . . . .
Figure 6–11: Lifting the chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–12: Foam pad and hole plug locations on the back cover . .
Figure 6–13: Routing the battery wires . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–14: Removing the main board and switch flex-circuit
assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–15: Foam pad locations on the chassis . . . . . . . . . . . . . . . . . .
Figure 6–16: Reassembling the chassis . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–17: Battery connector location . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–18: Bypassing the ON/STBY switch . . . . . . . . . . . . . . . . . . .
6–8
6–9
6–10
6–12
6–13
6–14
6–15
6–17
6–18
6–19
6–20
6–21
6–22
Figure 10–1: Exploded diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10–5
THS710A, THS720A, THS730A & THS720P Service Manual
6–24
6–25
6–27
6–29
6–31
iii
Table of Contents
List of Tables
iv
Table 1–1: Oscilloscope specifications . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–2: DMM specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–3: General specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–1
1–8
1–10
Table 5–1: Summary of oscilloscope adjustment steps . . . . . . . . . . . .
Table 5–2: Summary of meter adjustment steps . . . . . . . . . . . . . . . . .
5–5
5–8
Table 6–1: Internal inspection check list . . . . . . . . . . . . . . . . . . . . . . .
Table 6–2: Removal and installation procedures . . . . . . . . . . . . . . . . .
6–3
6–6
Table 7–1: TekScope instrument options . . . . . . . . . . . . . . . . . . . . . . .
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.
Only qualified personnel should perform service procedures.
Injury Precautions
Avoid Electric Overload
Avoid Electric Shock
Do Not Operate Without
Covers
Do Not Operate in
Explosive Atmosphere
To avoid injury or fire hazard, do not apply a voltage to any input, including the
common inputs, that varies from ground by more than the maximum rating for
that input.
To avoid injury or loss of life, do not connect or disconnect probes or test leads
while they are connected to a voltage source.
To avoid electric shock or fire hazard, do not operate this product with covers or
panels removed.
To avoid injury or fire hazard, do not operate this product in an explosive
atmosphere.
Product Damage Precautions
Use Proper Power Source
Do Not Operate With
Suspected Failures
Do not operate this product from a power source that applies more than the
voltage specified.
If you suspect there is damage to this product, have it inspected by qualified
service personnel.
THS710A, THS720A, THS730A & THS720P Service Manual
v
General Safety Summary
Safety Terms and Symbols
Terms in This Manual
These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
Terms on the Product
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product
The following symbols may appear on the product:
DANGER
High Voltage
Protective Ground
(Earth) Terminal
ATTENTION
Refer to Manual
Double
Insulated
Certifications and Compliances
CSA Certified AC Adapter
CSA Certification includes the AC adapters appropriate for use in the North
America power network. All other AC adapters supplied are approved for the
country of use.
Compliances
Consult the product specifications for Installation Category, Pollution Degree,
and Safety Class.
vi
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
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.
Related Manuals
Additional documentation for the instrument is contained in the related manuals
listed below.
Language
User Manual
Part Number
Reference
Part Number
Programmer Manual
Part Number
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
070-9739-XX
070-9749-XX
Japanese
070-9740-XX
070-9799-00
THS710A, THS720A, THS730A & THS720P Service Manual
ix
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.
x
2. Press this button on the front
panel.
3. Press this
bezel button.
4. Press the
bezel button
again until this
selection is highlighted.
5. Use the
+/– rocker to set
the value for a
parameter.
6.
7.
—
8.
9.
10.
THS710A, THS720A, THS730A & THS720P Service Manual
Specifications
This chapter contains the oscilloscope, DMM, and general specifications for the
THS710A, THS720A, THS730A, and THS720P TekScope instruments. All
specifications are guaranteed unless noted “typical.” Typical specifications are
provided for your convenience but are not guaranteed. Specifications that are
marked with the n symbol are checked in the chapter Performance Verification.
All specifications apply to all four instruments unless noted otherwise. All
specifications assume horizontal MAG is off, unless noted otherwise. To meet
specifications, two conditions must first be met:
H
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.
Table 1–1: Oscilloscope specifications
Acquisition
Acquisition Modes
Sample (Normal), Peak detect, Envelope, and Average
Acquisition Rate,
typical
Up to 25 waveforms per second (2 channels, sample acquisition mode,
MAG on, no measurements)
Single Sequence
Acquisition Mode
Acquisition Stops After
Sample, Peak Detect
Single acquisition, one or two
channels simultaneously
Average, Envelope
N acquisitions, one or two channels simultaneously, N is settable
from 2 to 256 or ∞
Inputs
Input Coupling
DC, AC, or GND
Input Impedance,
DC Coupled
1 M ±1% in parallel with 25 pF ±2 pF
Maximum Voltage
et ee Si
Between
Signall and
Common at Input
N
BNC
Overvoltage Category
Maximum Voltage
CAT II Environment (refer to
page 1–13)
300 VRMS
CAT III Environment (refer to
page 1–13)
150 VRMS
For steady-state sinusoidal waveforms, derate at 20 dB/decade above
100 kHz to 13 Vpk at 3 MHz and above. Also, refer to Overvoltage
Category description on page 1–13.
THS710A, THS720A, THS730A & THS720P Service Manual
1–1
Specifications
Table 1–1: Oscilloscope specifications (Cont.)
Inputs
Maximum Voltage
Between Common
and Earth Ground
at BNC
600 VRMS (CAT II) or 300 VRMS (CAT III), using rated connectors or
accessories
Maximum Voltage,
Channel-to-Channel
Commons
30 VRMS, 42.4 Vpk, using noninsulated connectors and acessories
Channel-to-Channel
Common Mode
Rejection, typical
100:1 at frequencies ≤50 MHz, measured on MATH Ch1 – Ch2
waveform, with test signal applied between signal and common of both
channels, and with the same VOLTS/DIV and coupling settings on each
channel
Channel-to-Channel
Crosstalk, typical
≥100:1 at 50 MHz, measured on one channel, with test signal applied
between signal and common of the other channel, and with the same
VOLTS/DIV and coupling settings on each channel
Common to Chassis
Capacitance, typical
55 pF
30 VRMS, 42.4 Vpk, using noninsulated connectors and acessories
Vertical
1–2
Number of Channels
2
Digitizers
8 bit resolution, separate digitizers for each channel sample
simultaneously
VOLTS/DIV Range
5 mV/div to 50 V/div at input BNC
Polarity
Normal and Invert
Position Range
±10 divisions
n Analog Bandwidth
att BNC,
N DC
D Coupled
o ple
(typical at 5 mV/div,
guaranteed at all
other settings)
THS710A
THS720A
THS720P
THS730A
60 MHz at input
BNC
100 MHz at
input BNC
100 MHz at
input BNC
200 MHz at
input BNC
(90 MHz above
35° C)
(90 MHz above
35° C)
(180 MHz
above 35° C)
Peak Detect or Envelope Bandwidth,
i t
typic l (25
typical
25 MS/s
S s or
slower)
THS710A
THS720A
THS720P
THS730A
50 MHz
75 MHz
75 MHz
85 MHz
Analog Bandwidth
Limit, typical
Selectable between 20 MHz or full
Lower Frequency
Limit, AC Coupled,
typical
≤10 Hz at BNC, reduced by a factor of ten when using a 10X passive
probe
Rise Time at BNC,
typic l
typical
THS710A
THS720A
THS720P
THS730A
5.8 ns
3.5 ns
3.5 ns
1.75 ns
Peak Detect or Envelope Pulse Response,
typical
Captures 50% or greater amplitude of pulses ≥ 8 ns wide (≥ 20 ns wide
at 500 ns/div)
THS710A, THS720A, THS730A & THS720P Service Manual
Specifications
Table 1–1: Oscilloscope specifications (Cont.)
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 Measurement
Acc
r cy Average
Aver e
Accuracy,
Acquisition Mode
Using ≥16 Waveforms
orms
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| +
(0.05 div × volts/div)]
DC Measurement
Accuracy, Sample
Acq. Mode, typical
±[2% × |reading + (position × volts/div)| + (0.15 div × volts/div) +
0.6 mV]
Horizontal
Sample Rate Range
THS710A
THS720A
THS720P
THS730A
5 S/s to
250 MS/s, in a
1.25, 2.5, 5
sequence
5 S/s to
500 MS/s, in a
1.25, 2.5, 5
sequence
5 S/s to
500 MS/s, in a
1.25, 2.5, 5
sequence
5 S/s to 1 GS/s,
in a 1.25, 2.5, 5
sequence
Record Length
2500 samples for each channel
SEC/DIV Range
i cl i MAG)
A
(including
THS710A
THS720A
THS720P
THS730A
10 ns/div to
50 s/div
5 ns/div to
50 s/div
5 ns/div to
50 s/div
2 ns/div to
50 s/div
n Sample Rate and
Delay Time Accuracy
±200 ppm over any ≥1 ms time interval
Delay Time Range
Zero to 50 s
Internal Trigger
n Trigger Sensitivity, Coupling
Edgee Trigger
ri er Type
ype
DC
(THS710A, THS720A,
and THS720P)
Sensitivity
n Trigger Sensitivity,
Edgee Trigger
ri er Type
ype
(THS730A)
Coupling
Sensitivity
DC
0.35 div from DC to 50 MHz,
increasing to 1.5 div at 200 MHz
(180 MHz above 35° C)
THS710A, THS720A, THS730A & THS720P Service Manual
0.35 div from DC to 50 MHz,
increasing to 1 div at 100 MHz
(90 MHz above 35° C)
1–3
Specifications
Table 1–1: Oscilloscope specifications (Cont.)
Internal Trigger
Trigger Sensitivity,
ri er Type,
ype
Edgee Trigger
typic l
typical
Coupling
Sensitivity
NOISE REJ
3.5 times the DC-coupled limits
HF REJ
1.5 times the DC-coupled limit
from DC to 30 kHz, attenuates
signals above 30 kHz
LF REJ
1.5 times the DC-coupled limits
for frequencies above 1 kHz,
attenuates signals below 1 kHz
Trigger Level Range
±4 divisions from center of screen
Motor Trigger Level
Range (THS720P)
0.1 to 5 divisions from center screen, polarity depends on slope
selection
Trigger Level
Accuracy, typical
±0.2 divisions, for signals having rise and fall times ≥20 ns
SET LEVEL TO 50%,
typical
Operates with input signals ≥50 Hz
Width Range, Pulse
Trigger Type, typical
99 ns to 1 s, with resolution of 33 ns or approximately 1% of setting
(whichever is greater)
Width Tolerance
Range, Pulse Trigger
Type, typical
5%, 10%, 15%, or 20%
Sensitivity, Video
Trigger Type, typical
Composite video signal with negative sync pulse amplitude from 0.6
to 2.5 divisions
Signal Formats and
Field Rates, Video
Trigger
ri er Type
ype
Broadcast systems
Supports NTSC, PAL, and
SECAM
Interlaced
Trigger on selected line of odd
field, selected line of even field, or
any line
Non-interlaced
Trigger on selected line or any line
Line Rates
15 kHz to 65 kHz, in five ranges
Holdoff Range
495 ns to 10 s
External Trigger
1–4
External Trigger, Maximum Input Voltage
600 VRMS CAT II or 300 VRMS CAT III (refer to page 1–13)
External Trigger
Coupling
DC only
External Trigger
Levels
+0.2 V or +2 V, selectable
External Trigger
Sensitivity
500 mVp-p from DC to 1 MHz, increasing to 1 Vp-p at 5 MHz, with
signal centered at selected trigger level
THS710A, THS720A, THS730A & THS720P Service Manual
Specifications
Table 1–1: Oscilloscope specifications (Cont.)
Measurements
Cursors
Voltage difference between cursors (DV)
Time difference between cursors (DT)
Reciprocal of DT in Hertz (1/DT)
Phase difference between cursors (DDegrees)
Automated
Measurements
Amplitude, Burst Width, Cycle Mean, Cycle RMS, Fall Time,
Frequency, High, Low, Max, Mean, Min, Negative Duty Cycle, Negative
Overshoot, Negative Width, Pk – Pk, Period, Positive Duty Cycle,
Positive Overshoot, Positive Width, Rise Time, and RMS
Voltage and Current Harmonics (THS720P)
Number of Harmonics
First 31 harmonics of signal with fundamental frequency between
30 Hz and 450 Hz
Harmonics Amplitude
Accuracy
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%
Harmonics Phase
Acc r cy
Accuracy
Fundamental
2 – 11
12 – 21
22 – 31
—
±4 °
±8 °
±8 °
THD-F Measurement
Total harmonic distortion relative to the fundamental amplitude
THD-F 2
V RMS
V f2
Vf
or
2
A RMS
A f2
Af
THD-F Accuracy
±4%
THD-R Measurement
Total harmonic distortion relative to the RMS amplitude
THD-R 2
V RMS
V f2
V RMS
THD-R Accuracy
±4%
Frequency Accuracy
±0.2% of reading
or
2
A RMS
A f2
A RMS
Power Measurements (THS720P)
True Power
Measurement
W 1n V A
n
n
n
measured over an integral number of cycles that
contain n sample points
Apparent Power
Measurement
VA V RMS A RMS
Reactive Power
Measurement
VAR (VA) 2 W 2
Power Measurements
Accuracy
±4% at the BNCs (not including probe uncertainty)
THS710A, THS720A, THS730A & THS720P Service Manual
1–5
Specifications
Table 1–1: Oscilloscope specifications (Cont.)
Power Measurements (THS720P)
PF Measurement
Power factor (PF) true power
W
VA
apparent power
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 Measurements Accuracy
±0.05
With P6117 Probe
Analog Bandwidth,
D Coupled
DC
o ple
THS710A
THS720A
THS720P
THS730A
60 MHz
100 MHz
100 MHz
200 MHz
(90 MHz above
35° C)
(90 MHz above
35° C)
(180 MHz
above 35° C)
Probe Attenuation
10X
Maximum Voltage
et ee Probe Tip
ip
Between
and Reference Lead
Overvoltage Category
Maximum Voltage
CAT II Environment (refer to
page 1–13)
300 VRMS
CAT III Environment (refer to
page 1–13)
150 VRMS
For steady-state sinusoidal waveforms, derate at 20 dB/decade above
900 kHz to 13 Vpk at 27 MHz and above. Also, refer to Overvoltage
Category description on page 1–13.
1–6
Maximum Voltage
Between Reference
Lead and Earth
Ground Using P6117
Probe
30 VRMS, 42.4 Vpk
Maximum Voltage,
Channel-to-Channel
Reference Leads
Using P6117 Probe
30 VRMS, 42.4 Vpk
THS710A, THS720A, THS730A & THS720P Service Manual
Specifications
Table 1–1: Oscilloscope specifications (Cont.)
With P5102 Probe
Analog Bandwidth,
D Coupled
DC
o ple
THS710A
THS720A
THS720P
THS730A
60 MHz
100 MHz
100 MHz
100 MHz
(90 MHz above
35° C)
(90 MHz above
35° C)
Probe Attenuation
10X
Maximum Voltage
et ee Probe Tip
ip
Between
and Reference Lead,
D Coupled
DC
o ple
Overvoltage Category
Maximum Voltage
CAT II Environment (refer to
page 1–13)
1000 VRMS
CAT III Environment (refer to
page 1–13)
600 VRMS
Overvoltage Category
Maximum Voltage
CAT II Environment
±1000 VDC
CAT III Environment
±600 VDC
Overvoltage Category
Maximum Voltage
CAT II Environment
600 VRMS
CAT III Environment
300 VRMS
Maximum Voltage
et ee Probe Tip
ip
Between
and Reference
e ere ce Lead,
e
AC Coupled
Maximum Voltage
Between
et ee Reference
e ere ce
Lead
e and Earth
rt
Ground
THS710A, THS720A, THS730A & THS720P Service Manual
1–7
Specifications
Table 1–2: DMM specifications
General
Resolution
33⁄4 digit, 4000 count full scale reading except as noted
Input Resistance, AC
or DC Voltage
10 M ±10%
Input Capacitance,
AC or DC Voltage,
typical
≤100 pF
Maximum Voltage
et ee DMM
D
Between
and
COM Inputs
Overvoltage Category
Maximum Voltage
CAT I Environment (refer to
page 1–13)
640 VRMS (880 VDC)
CAT II Environment (refer to
page 1–13)
600 VRMS
CAT III Environment (refer to
page 1–13)
300 VRMS
Overvoltage Category
Maximum Voltage
CAT I Environment (refer to
page 1–13)
640 VRMS (880 VDC)
CAT II Environment (refer to
page 1–13)
600 VRMS
CAT III Environment (refer to
page 1–13)
300 VRMS
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
1V
Maximum Voltage
et ee DMM
D
or
Between
COM Input and Earth
Ground
ro
DC Voltage
Ranges and
Resolution
esol tio
1–8
n Accuracy
±(0.5% of reading + 5 counts)
Normal Mode
Rejection, typical
Rejects AC signals by >60 dB at 50 Hz or 60 Hz (user selectable)
Common Mode
Rejection, typical
Rejects AC signals by >100 dB at 50 Hz or 60 Hz (user selectable)
THS710A, THS720A, THS730A & THS720P Service Manual
Specifications
Table 1–2: DMM specifications (Cont.)
AC Voltage
Conversion Type
AC conversions are true RMS. The AC measurement is based on the
AC and DC components of the signal as shown below:
AC Measurement = RMS(AC+DC) – DC
Ranges and
Resolution
esol tio
n Accuracy
40 Hz to 500 Hz)
(40
Common Mode
Rejection, typical
Range
Resolution
400.0 mV
0.1 mV
4.000 V
1 mV
40.00 V
10 mV
400.0 V
100 mV
640 V
1V
Input Waveform
Maximum Error
Sinusoidal waveforms
±(2% of reading + 5 counts)
Nonsinusoidal waveforms with
crest factor up to 3
±(4% of reading + 5 counts)
Rejects AC signals by >60 dB at DC, 50 Hz, and 60 Hz
/Resistance
Ranges and
Resolution
esol tio
n Accuracy
Bias Voltage for Full
Sc
le Resistance
esist ce
Scale
e s reme t typical
typic l
Measurement,
Range
Resolution
400.0 0.1 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
≤60% relative humidity
Range
Full Scale Bias Voltage
400.0 350 mV
4.000 k
200 mV
40.00 k
350 mV
400.0 k
350 mV
4.000 M
400 mV
40.00 M
1.10 V
THS710A, THS720A, THS730A & THS720P Service Manual
1–9
Specifications
Table 1–2: DMM specifications (Cont.)
/Resistance
Open Circuit Voltage,
typic l
typical
Range
Open Circuit Voltage
400.0 4.8 V
All other ranges
≤1.2 V
Continuity Check
Indication
An audible tone is generated when measured resistance is below 50 ,
typical
Open Circuit Voltage,
typical
4V
Test Current, typical
1 mA
Diode Check
Range
Zero to 2 V, measures forward voltage drop of semiconductor junction
Voltage Accuracy,
typical
±25%
Open Circuit Voltage,
typical
4V
Test Current, typical
1 mA
Data Logger
Horizontal Scale
Range
30 s/div to 24 hours/div (4 minutes to 8 days, full scale)
Vertical Zoom Range
2X, 5X, or 10X
Table 1–3: General specifications
Display
1–10
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/m2
THS710A, THS720A, THS730A & THS720P Service Manual
Specifications
Table 1–3: General specifications (Cont.)
RS-232 Interface
Device Type
DTE. at RJ-45 connector
Pinout
Signal
Pin Number at
Pin Number at
9-pin Null
RJ-45
Modem Adapter Connector
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
5.0 V into ≥1 M load
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 Indication, typical
Low battery message first appears approximately ten minutes before
the instrument powers off automatically
Battery Saver
Standby Time-out and Backlight Time-out extend battery life. Time-out
ranges from 1 minute to 15 minutes, or off.
Battery Charging
Time, typical
With TekScope instrument operating
9 hours
With TekScope instrument turned
off
9 hours
In external charger
1.5 hours
External Power
12 VDC nominal, center positive; Operates with input from 10 VDC to
15 VDC
The DC INPUT disconnects itself automatically if >15 VDC is applied.
If this occurs, disconnect the overvoltage and then reconnect to a
voltage in the proper range.
Memory Retention,
typical
All memory is retained indefinitely with battery removed and without
external power applied.
Fuse
This instrument has no user-replaceable fuses
THS710A, THS720A, THS730A & THS720P Service Manual
1–11
Specifications
Table 1–3: General specifications (Cont.)
Environmental
Temperature
Humidity
Altitude
Random Vibration
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
Operating
2.66 gRMS from 5 Hz to 500 Hz,
10 minutes on each axis
Nonoperating
3.48 gRMS from 5 Hz to 500 Hz,
10 minutes on each axis
Drop Resistance,
typical
Survives a 30 in (76 cm) drop onto concrete with only cosmetic damage
Moisture Resistance
Meets IEC529, IP43 with DC input hole plug, I/O port hole plug, and
battery door installed.
Mechanical
Size
Weight
Height
8.53 in (217 mm)
Width
6.95 in (177 mm)
Depth
2.00 in (50.8 mm)
With battery installed
3.2 lbs (1.5 kg)
With all standard accessories in
soft carry case
7.5 lbs (3.4 kg)
When packaged for domestic
shipment
9.0 lbs (4.1 kg)
Adjustment Interval
The recommended adjustment interval is one year
1–12
THS710A, THS720A, THS730A & THS720P Service Manual
Specifications
Table 1–3: General specifications (Cont.)
Certifications and Compliances
Certifications
Listed UL3111-1 and CAN/CSA-C22.2 No. 1010.1-92, complies with
EN61010-1 /A2
Overvoltage Category
Category
Examples
CAT III
A typical CAT III environment is
the power distribution system
within a building or factory. These
environments are somewhat
protected from lightning strikes,
but susceptible to switching
transients and other disturbances
that may generate high voltage
impulses.
CAT II
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.
CAT 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 Emissions1 3
EN 50081–1 Emissions:
EN 60555–2
Power Harmonics
EN 50082–1 Immunity:
IEC 801–2
IEC 801–3
IEC 801–4
IEC 801–5
Electrostatic Discharge
RF Radiated2
Fast Transients
Surge3
EN 61010–1 Safety
1
Tektronix-supplied ferrite bead required on instrument end of
RS-232 cable
2
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
3
Applies to instrument operating with Tektronix-supplied AC
adapter
THS710A, THS720A, THS730A & THS720P Service Manual
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
Figure 2–2: AC adapter attachment
2–2
THS710A, THS720A, THS730A & THS720P Service Manual
Operator Information
CAUTION. To avoid overheating, do not connect external power while the
instrument is in a confined space, such as in the soft case.
Understanding the Front Panel
The SCOPE and METER buttons select the operating mode. The front panel has
additional buttons for the functions you use most often and menus to access the
more specialized functions.
Using Scope Mode
Press the front-panel SCOPE button to enter scope mode. Then, press 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
Measurement
readout area
Waveform readout lines
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.
NOTE. In the Performance Verification, Adjustments, and Maintenance chapters
of this manual, TekScope instrument setups are shown in tables. Refer to
Conventions on page x for information about reading these tables.
2–6
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.
1
3
2
4
16
15
5
14
6
13
12
11
10
9
8
7
1. HARD COPY. Initiates a hard copy using the RS-232 port.
2. HOLD. Stops/restarts oscilloscope acquisition or holds/resets meter readout.
3. AUTORANGE. Selects oscilloscope or meter autorange function.
4. CLEAR MENU. Clears menu from display.
5. TRIGGER LEVEL. Adjusts trigger level.
6. SET LEVEL TO 50%. Sets trigger level to midpoint of oscilloscope
waveform.
7. HORIZONTAL POSITION. Adjusts oscilloscope waveform horizontal
position.
8. MAG. Turns 10X horizontal magnification on and off.
9. SEC/DIV. Adjusts waveform horizontal scale factor for oscilloscope or data
logger.
10. VERTICAL POSITION. Adjusts oscilloscope waveform vertical position.
11. WAVEFORM OFF. Removes selected oscilloscope waveform from display.
12. VOLTS/DIV. Adjusts oscilloscope vertical scale factor or meter range.
13. ON/STBY. Selects on or standby. Does not disconnect power from the
instrument.
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
Side panel
Figure 2–5: Connector locations
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
If you are using both of the oscilloscope channels, you must attach the probe
reference lead for each channel directly to your circuit. These attachments are
required because the oscilloscope channels are electrically isolated; they do not
share a common chassis connection. If you are also using the DMM, you must
also attach the DMM common lead to your circuit for the same reason as above.
Beware of High Voltages
Understand the voltage ratings for the probes you are using and do not exceed
those ratings. Two ratings are important to know and understand:
H
The maximum measurement voltage from the probe tip to the probe
reference lead
H
The maximum floating voltage from the probe reference lead to earth ground
These two voltage ratings depend on the probe and your application. Refer to
Specifications beginning on page 1–1 for more information.
WARNING. To prevent electrical shock, do not exceed the measurement or
floating voltage ratings for the oscilloscope input BNC connector, probe tip,
probe reference lead, DMM input connector, or DMM lead.
2–10
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
Each of the two oscilloscope input signals enters the main board and passes
through an attenuator and buffer amplifier. Then each signal passes through an
isolation interface before reaching the trigger circuitry, a sampler, and a digitizer.
The digitized signals are written into system memory for transfer to the display
system.
Meter Signal Path
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.
Processor System
The processor system contains a 68331 microprocessor that controls the entire
instrument. The processor passes waveforms, meter readings, and text on to the
display system. The processor system also contains flash ROM, system RAM,
and the RS-232, keyboard, and probe compensation interfaces.
Display System
Power Supply
The display system, consisting of a display controller and video memory,
processes text and waveforms to refresh the display.
The power supply provides DC power to ciruits on the main board and generates
an AC voltage to provide power to the attenuators and buffer amplifiers across
the isolation interfaces. It also provides +12 V and –20 V for the display module.
Inverter Board
The inverter board generates an AC voltage for the display backlight.
THS710A, THS720A, THS730A & THS720P Service Manual
3–1
Theory of Operation
Display Module
The display module consists of a liquid crystal display (LCD), a display driver,
and a flourescent backlight.
Switch Assembly
The switch assembly is a matrix of switches that form the front-panel buttons.
The switch assembly consists of a flex-circuit board and an elastomeric switch
mat. Switch closures are read by the processor system.
EXT
PWR
CH 1
CH 2
2
J8
Battery
Main board
2
PROBE
COMP
J9
Adjustmentlockout
J5
12
8
RS-232
J3
COM
Not used
80
J1
DMM
J7
5
Display assembly
Inverter board
J6
17
Switch assembly
2
Figure 3–1: Module-level block diagram
3–2
THS710A, THS720A, THS730A & THS720P Service Manual
Performance Verification
This chapter contains performance verification procedures for the specifications
marked with the n symbol. The following equipment, or a suitable equivalent,
is required to complete these procedures.
Description
Minimum
Requirements
Examples
DC Voltage Source
60 mV to 800 V, ±0.1% accuracy
AC Voltage Source
300 mV to 640 V, ±0.5%
accuracy at 500 Hz
Resistance Standard
360 to 36 M, ±0.1%
accuracy
Leveled Sine Wave Generator
50 kHz and 100 MHz, ±3%
amplitude accuracy
Time Mark Generator
10 ms period, ±50 ppm accuracy
Banana to Banana Cable (two
required)
Shielded banana jacks on
each end
Tektronix Deluxe Meter Lead
Set (ATLDX1)
50 BNC Cable
BNC male to BNC male,
≈ 36 in (1 m) long
Tektronix part number
012-0482-00
50 Feedthrough Termination
BNC male and female connectors
Tektronix part number
011-0049-01
Dual Banana to BNC Adapter
Banana plugs to BNC female
Tektronix part number
103-0090-00
THS710A, THS720A, THS730A & THS720P Service Manual
Wavetek 9100 Universal
Calibration System with Oscilloscope Calibration
libr tio Module
o le
(Option 250)
Fl e 5500A Multi-product
lti-pro ct
Fluke
Calibrator with Oscilloscope
Calibration Option (Option
5500A-SC)
4–1
Performance Verification
Test Record
Serial
Number
Procedure Performed by
Date
Test
Passed
Failed
Test Result
High Limit
Self Test
Oscilloscope Tests
Channel 1 DC Measureme
r cy
mentt Acc
Accuracy
Low Limit
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
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
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
—
Channel 2 DC Measureme
r cy
mentt Acc
Accuracy
4–2
THS710A, THS720A, THS730A & THS720P Service Manual
Performance Verification
DMM Tests
DC Voltage Accuracy
AC Voltage Accuracy
Resistance Accuracy
Low Limit
Test Result
High Limit
400 mV range,
60 mV input
59.2 mV
60.8 mV
400 mV range,
360 mV input
357.7 mV
362.3 mV
4 V range
3.577 V
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
0.583 V
0.617 V
4 V range,
3.6 V input
3.523 V
3.677 V
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
5.95 k
6.05 k
40 k range,
36 k input
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
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:
SCOPE
UTILITY
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
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:
SCOPE
UTILITY
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
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:
SCOPE
*
SAVE/
RECALL
Recall Saved
Setup
Recall Factory
Setup
OK Recall
Factory
—
—
CH 1
—
VERTICAL
MENU
Probe Type
Voltage Probe
Set to 1X
ACQUIRE
Mode
Average
Set to 16
MEAS
Select Measrmnt
Mean*
—
OK Select
Measrmnt
—
You may need to press Select Page to display this selection.
3. Connect the TekScope instrument to the DC voltage source as shown below.
DC voltage
source
Ch 1
– +
Dual banana
to bnc adapter
BNC cable
4–6
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 Vpos.
b. Reverse the polarity of the DC voltage source and then record the mean
measurement as Vneg.
c. Calculate Vdiff = Vpos – Vneg and then compare Vdiff to the accuracy
limits in the table.
VOLTS/DIV Setting
DC Voltage Source Output
Levels
Accuracy Limits for Vdiff
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
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
Check Oscilloscope
Channel 1 Bandwidth
This test checks the bandwidth of channel 1.
1. Set up the TekScope instrument using the following steps:
SCOPE
*
Recall Saved
Setup
Recall Factory
Setup
OK Recall
Factory
—
ACQUIRE
Mode
Average
Set to 16
TRIGGER
Coupling
Noise Reject
—
MEAS
High-Low Setup
Min-Max
Select Measrmnt
Pk-Pk*
OK Select
Measrmnt
—
SAVE/
RECALL
—
—
You may need to press Select Page to display this selection.
2. Connect the TekScope instrument to the leveled sine wave generator as
shown below.
Leveled
sine wave
generator
50 feedthrough
terminator
Ch 1
Output
BNC cable
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.
THS710A, THS720A, THS730A & THS720P Service Manual
4–9
Performance Verification
Check Oscilloscope
Channel 2 Bandwidth
This test checks the bandwidth of channel 2.
1. First check the channel 1 bandwidth using the previous test. Then, perform
these additional steps to check the channel 2 bandwidth:
SCOPE
CH 1
—
—
TRIGGER
Source
Ch2
MEAS
High-Low Setup
Min-Max
Select Measrmnt
Pk-Pk*
OK Select Measrmnt
—
WAVEFORM OFF
CH 2
*
You may need to press Select Page to display this selection.
2. Connect the TekScope instrument to the leveled sine wave generator as
shown below.
Leveled
sine wave
generator
50 feedthrough
terminator
Ch 2
Output
BNC cable
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.
THS710A, THS720A, THS730A & THS720P Service Manual
4–11
Performance Verification
Check Oscilloscope
Sample Rate and Delay
Time Accuracy
This test checks the oscilloscope time base accuracy.
1. Set up the TekScope instrument using the following steps:
SCOPE
SAVE/
RECALL
VERTICAL
MENU
Recall Saved
Setup
Recall Factory
Setup
OK Recall
Factory
—
Probe Type
Voltage Probe
—
Set to 1X
2. Connect the TekScope instrument to the time mark generator as shown
below.
50 feedthrough
terminator
Time mark
generator
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
6. Press SET LEVEL TO 50%.
7. Press MAG.
8. Change the TekScope instrument setup using the following steps:
SCOPE
HORIZONTAL MENU
Time Base
Delayed Runs After —
Main
CLEAR
MENU
—
—
9. Set the delayed time base SEC/DIV to 50 ms/div.
10. Change the TekScope instrument setup using the following steps:
SCOPE
HORIZONTAL MENU
Time Base
Delayed Runs After Set delay time to
Main
10 ms
CLEAR
MENU
—
—
—
11. Set the delayed time base SEC/DIV to 500 ns/div.
12. Check that the rising edge of the marker crosses the center horizontal
graticule line within ±4 divisions of center graticule.
NOTE. One division of displacement from graticule center corresponds to
a 50 ppm time base error.
THS710A, THS720A, THS730A & THS720P Service Manual
4–13
Performance Verification
Check Oscilloscope
Channel 1 Edge Trigger
Sensitivity
This test checks the edge trigger sensitivity for channel 1.
1. Set up the TekScope instrument using the following steps:
SCOPE
*
Recall Saved
Setup
Recall Factory
Setup
OK Recall
Factory
—
ACQUIRE
Mode
Average
Set to 16
TRIGGER
Mode
Normal
—
MEAS
High-Low Setup
Min-Max
Select Measrmnt
Ampl*
OK Select
Measrmnt
—
SAVE/
RECALL
—
You may need to press Select Page to display this selection.
2. Connect the TekScope instrument to the leveled sine wave generator as
shown below.
Leveled
sine wave
generator
50 feedthrough
terminator
Ch 1
Output
BNC cable
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. Set the TekScope instrument SEC/DIV to 10 ns/div.
6. Set the leveled sine wave generator output level to approximately 50 mVp-p
so that the measured amplitude is approximately 500 mV. (The measured
amplitude can fluctuate around 500 mV.)
7. Press SET LEVEL TO 50%. Adjust TRIGGER LEVEL as necessary and
then check that triggering is stable.
8. Change the TekScope instrument setup using the following steps:
SCOPE
TRIGGER
Slope
\ (falling edge)
9. Press SET LEVEL TO 50%. Adjust TRIGGER LEVEL as necessary and
then check that triggering is stable.
10. Change the TekScope instrument setup using the following steps:
SCOPE
TRIGGER
Slope
/ (rising edge)
11. Proceed to the next test to check the channel 2 edge trigger sensitivity.
THS710A, THS720A, THS730A & THS720P Service Manual
4–15
Performance Verification
Check Oscilloscope
Channel 2 Edge Trigger
Sensitivity
This test checks the edge trigger sensitivity for channel 2.
1. First check the channel 1 edge trigger sensitivity using the previous test.
Then, perform these additional steps to check the channel 2 edge trigger
sensitivity:
SCOPE
CH 1
—
—
TRIGGER
Source
Ch2
MEAS
High-Low Setup
Min-Max
Select Measrmnt
Ampl*
OK Select Measrmnt
—
WAVEFORM OFF
CH 2
*
You may need to press Select Page to display this selection.
2. Connect the TekScope instrument to the leveled sine wave generator as
shown below.
Leveled
sine wave
generator
50 feedthrough
terminator
Ch 2
Output
BNC cable
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 TekScope instrument SEC/DIV to 10 ns/div.
6. Set the leveled sine wave generator output level to approximately 50 mVp-p
so that the measured amplitude is approximately 500 mV. (The measured
amplitude can fluctuate around 500 mV.)
7. Press SET LEVEL TO 50%. Adjust TRIGGER LEVEL as necessary and
then check that triggering is stable.
8. Change the TekScope instrument setup using the following steps:
SCOPE
TRIGGER
Slope
\ (falling edge)
9. 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.
Range
DC Voltage Source
Output Level
Accuracy Limits
400 mV
60 mV
59.2 mV to 60.8 mV
400 mV
360 mV
357.7 mV to 362.3 mV
4V
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
5. Set the DC voltage source output level to 0 V.
THS710A, THS720A, THS730A & THS720P Service Manual
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.
Range
AC Voltage Source
Output Level
Accuracy Limits
400 mV
360 mV
352.3 mV to 367.7 mV
4V
600 mV
0.583 V to 0.617 V
4V
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
6. Set the AC voltage source output level to 0 V.
THS710A, THS720A, THS730A & THS720P Service Manual
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.
Range
Resistance Standard
Setting
Accuracy Limits
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%.
This completes the performance verification procedure.
THS710A, THS720A, THS730A & THS720P Service Manual
4–23
Performance Verification
4–24
THS710A, THS720A, THS730A & THS720P Service Manual
Adjustment Procedures
This chapter contains adjustment procedures for the TekScope instrument.
Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service
procedures. Also refer to the chapter Operating Information for information
about using the TekScope instrument.
NOTE. The voltage references inside the TekScope instrument are very stable over
time and should not require routine adjustment. Before performing any 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.
Description
Minimum
Requirements
Examples
DC Voltage Source
400 mV to 800 V, ±0.1%
accuracy
AC Voltage Source
400 mV to 600 V, ±0.5%
accuracy at 500 Hz
Resistance Standard
100 W to 10 MW, ±0.1%
accuracy
Fast-Rise Square Wave
Generator
300 mV step, ≤20 ns risetime,
≤0.5% flattness from 500 ns
to 200 ms, 500 Hz or 950 Hz,
nominal 50% duty cycle
Banana to Banana Cable (two
required)
Shielded banana jacks on
each end
Tektronix Deluxe Meter Lead
Set (ATLDX1)
50 W BNC Cable
BNC male to BNC male,
≈ 36 in (1 m) long
Tektronix part number
012-0482-00
50 W BNC Cable
BNC male to BNC male,
≈ 10 in (25 cm) long
Tektronix part number
012-0208-00
50 W Feedthrough
Termination
BNC male and female connectors
Tektronix part number
011-0049-01
THS710A, THS720A, THS730A & THS720P Service Manual
Wavetek 9100 Universal
Calibration System with Oscilloscope Calibration
libr tio Module
o le
(Option 250)
Fl e 5500A Multi-product
lti-pro ct
Fluke
Calibrator with Oscilloscope
Calibration Option (Option
5500A-SC)
5–1
Adjustment Procedures
Description
Minimum
Requirements
Dual Banana to BNC Adapter
Banana plugs to BNC female
Tektronix part number
103-0090-XX
BNC T
One male and two female
BNC connectors
Tektronix part number
103-0030-XX
Examples
Overview of the Adjustment Process
The TekScope instrument is protected from inadvertent adjustment by an internal
adjustment-lockout jumper. Some disassembly is required to access and remove
the jumper before you can adjust the instrument. After adjustment is complete,
the jumper should be replaced to protect the calibration of the instrument.
Oscilloscope adjustment and meter adjustment are independent procedures. You
can choose to adjust either or both. Each procedure consists of a series of steps;
as you move through these steps, the TekScope instrument display provides
instructions that describe the specific input signal requirements for each step.
NOTE. During some steps, the instrument may appear to be idle for several
minutes while it is processing information internally. Please have patience.
If all steps in the procedure are completed successfully, a “Pass” message is
displayed and the new calibration constants take affect. If any step fails, the
procedure is aborted and the current calibration is not affected. You can also
choose to abort the procedure at any step.
Before performing adjustment procedures, you must warm up the instrument at
least ten minutes in an ambient temperature between 20° C and 30° C. 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.
5–2
THS710A, THS720A, THS730A & THS720P Service Manual
Adjustment Procedures
Accessing the Adjustment-Lockout Jumper
Before adjusting the instrument you must (temporarily) remove the internal
adjustment-lockout jumper. You will need a 12 in ⋅ lb (1.3 N ⋅ m) torque-limiting
screwdriver with Torx T-15 tip and a pair of needle-nose pliers to access and
remove the jumper.
WARNING. Before doing this or any other procedure in this manual, read the
General Safety Summary and Service Safety Summary found at the beginning of
this manual. Also, to prevent possible injury to service personnel or damage to
electrical components, read Preventing ESD on page 6–1.
Use this procedure to access and remove the adjustment-lockout jumper.
1. Disconnect all probes, cables, or meter leads from the instrument.
2. Disconnect the AC adapter, open the battery door, and remove the battery.
3. Place the TekScope instrument face down on a soft surface (such as an
anti-static mat).
4. Use the torque-limiting Torx T-15 screwdriver to remove the four screws
that hold the case together.
5. Holding the case together, pick it up and place it back side down on a soft
surface.
6. As you lift the front cover off the instrument, press the buttons as necessary
to prevent the switch mat from coming off with the front cover.
7. To remove the switch mat, lift it off the switch flex-circuit assembly. Place it
button-side down on a clean surface.
CAUTION. To avoid contamination of switch contacts, do not touch the carbon
contacts on the switch flex-circuit assembly or on the back side of the switch
mat.
8. Fold the switch flex-circuit assembly toward you to expose the display
module, inverter board, and adjustment-lockout jumper. The jumper location
is shown in Figure 5–1.
9. Use the needle nose pliers to remove the adjustment-lockout jumper from the
instrument. Set the jumper aside for replacement after the adjustment is
complete.
10. To reassemble the instrument, fold the switch flex-circuit assembly back
over the display module and inverter board.
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
Adjustment Procedures
c. When all four all screws are in, hold a corner of the case together firmly
to compress the gasket while tightening its screw until snug. Repeat for
the other corners. Do not overtighten the screws (14 in ⋅ lbs or 1.5 N ⋅ m
maximum torque).
15. Replace the battery as shown on page 2–2, and then close the battery door.
Oscilloscope Adjustment
Three equipment setups, shown in Figure 5–2, are required to complete this
adjustment procedure. For each step in the procedure, the specific input signal
required by that step is described in the TekScope instrument display. Refer to
these diagrams as necessary during the procedure. Table 5–1 summarizes the
steps in the procedure and the signal requirement for each step.
Table 5–1: Summary of oscilloscope adjustment steps
Step
Uses Equipment Setup
Signal Source Setting
1
Square wave generator setup
Fast rise output, 300 mVp-p amplitude,
500 Hz or 950 Hz frequency
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
10 inch BNC cable
BNC ‘T’ connector
Fast rise square
wave generator
50 feedthrough
terminator
Ch 1
Ch 2
Output
36 inch BNC cable
Zero voltage setup
10 inch BNC cable
BNC ‘T’ connector
50 feedthrough
terminator
Ch 1
Ch 2
DC voltage setup
10 inch BNC cable
DC voltage
source
BNC ‘T’ connector
Ch 1
Ch 2
– +
Dual banana
to bnc adapter
36 inch BNC cable
Figure 5–2: Oscilloscope adjustment setups
5–6
THS710A, THS720A, THS730A & THS720P Service Manual
Adjustment Procedures
Oscilloscope Adjustment
Procedure
After removing the adjustment-lockout jumper, use this procedure to adjust the
oscilloscope voltage references.
1. Turn on the TekScope instrument and let it warm up for at least ten minutes.
2. Connect the fast rise square wave generator to the instrument as shown in the
Square wave generator setup of Figure 5–2.
3. Set the fast rise square wave generator to produce an amplitude between
250 mVp-p and 300 mVp-p, and frequency between 450 Hz and 950 Hz
(inclusive).
4. Use the TekScope instrument setup below to start the oscilloscope 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.
SCOPE
UTILITY
System
Cal
Factory Scope
—
OK Factory Cal Scope
NOTE. During some steps, the instrument may appear to be idle for several
minutes while it is processing information internally. Please have patience.
If any step in the procedure fails, the procedure terminates. Failure will result if
an incorrect signal source is connected. If this happens, you must start the
procedure over from the beginning.
If the procedure completes successfully, a “Pass” message is displayed and the
new adjustment takes effect.
Completing the
Adjustment Process
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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Adjustment Procedures
Meter Adjustment
Three equipment setups, shown in Figure 5–3, are required to complete this
adjustment procedure. For each step in the procedure, the specific input signal
required by that step is described in the TekScope instrument display. Refer to
these diagrams as necessary during the procedure. Table 5–2 summarizes the
steps in the procedure and the signal requirement for each step.
Table 5–2: Summary of meter adjustment steps
Step
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 mVRMS, 500 Hz
7
AC voltage setup
4.000 VRMS, 500 Hz
8
AC voltage setup
40.00 VRMS, 500 Hz
9
AC voltage setup
400.0 VRMS, 500 Hz
10
AC voltage setup
600.0 VRMS, 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 setup1
500.0 mV
18
DC voltage setup1
1.000 V
1
5–8
In steps 17 and 18, the DC voltage source must be able to sink approximately 1 mA
supplied by the TekScope instrument. You must determine whether or not your DC
voltage source is capable of sinking current supplied by a device under test. If the
DC voltage source cannot sink current, you can connect a 470 , 18 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.
THS710A, THS720A, THS730A & THS720P Service Manual
Adjustment Procedures
DC voltage setup
DC voltage
source
– +
Banana cables
AC voltage setup
AC voltage
source
Banana cables
Resistance standard setup
Resistance
standard
Banana cables
Figure 5–3: Meter adjustment setups
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Adjustment Procedures
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.
METER
UTILITY
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.
If the procedure completes successfully, a “Pass” message is displayed and the
new adjustment takes effect.
Completing the
Adjustment Process
5–10
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.
THS710A, THS720A, THS730A & THS720P Service Manual
Adjustment Procedures
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-lockout
jumper position
Figure 5–4: Relocating the adjustment-lockout jumper
This completes the adjustment procedure.
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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
Only qualified personnel should perform service procedures. Read the Service
Safety Summary and the General Safety Summary before performing any service
procedures. Also refer to the chapter Operating Information for information
about using the TekScope instrument.
Preventing ESD
When performing any service which requires internal access to the TekScope
instrument, adhere to the following precautions to avoid damaging internal
modules and their components due to electrostatic discharge (ESD).
CAUTION. Static discharge can damage any semiconductor component in this
instrument.
1. Minimize handling of static-sensitive modules.
2. Transport and store static-sensitive modules in their static protected
containers or on a metal rail. Label any package that contains static-sensitive
modules.
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Maintenance
3. Discharge the static voltage from your body by wearing a grounded antistatic
wrist strap while handling these modules. Do service of static-sensitive
modules only at a static-free work station.
4. Nothing capable of generating or holding a static charge should be allowed
on the work station surface.
5. Handle circuit boards by the edges when possible.
6. Do not slide the modules over any surface.
7. Avoid handling modules in areas that have a floor or work-surface covering
capable of generating a static charge.
Inspection and Cleaning
This section describes how to inspect for dirt and damage, and how to clean the
TekScope instrument. Inspection and cleaning are done as preventive maintenance. Preventive maintenance, when done regularly, may prevent malfunctions
and enhance reliability.
Preventive maintenance consists of visually inspecting and cleaning the
TekScope instrument, and using general care when operating it. How often to do
maintenance depends on the severity of the environment in which the instrument
is used. A proper time to perform preventive maintenance is just before
adjustment of the instrument.
General Care
Protect the TekScope instrument from adverse weather conditions. The 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.
Inspection and Cleaning
Procedures
6–2
Inspect and clean the TekScope instrument as often as operating conditions
require. The collection of dirt on internal components can cause them to overheat
and breakdown. Dirt acts as an insulating blanket, preventing efficient heat
dissipation. Dirt also provides an electrical conduction path that could cause an
instrument failure, especially under high-humidity conditions.
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.
Table 6–1: Internal inspection check list
Item
Inspect For
Repair Action
Front and Back
Cover
Cracks or deformations. Scratched
lettering or display filter. Loose
connectors or labels.
Repair or replace defective hardware.
Hole Plugs, Gasket
and Foam Pads
Misplaced or missing pieces.
Relocate or replace defective
pieces.
Circuit boards
Loose, broken, or corroded solder
connections. Burned circuit
boards. Burned, broken, or
cracked circuit-run plating.
Remove failed module and replace
with a new module.
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Maintenance
Table 6–1: Internal inspection check list (Cont.)
Item
Inspect For
Repair Action
Solder connections
Cold solder or rosin joints.
Resolder joint and clean with
isopropyl alcohol.
Wiring and cables
Loose plugs or connectors.
Burned, broken, or frayed wiring.
Firmly seat connectors. Repair or
replace modules with defective
wires or cables.
Cleaning Procedure — Interior. To clean the TekScope instrument interior,
perform the following steps:
1. Blow off dust with dry, low-pressure, deionized air (approximately 9 psi).
2. Remove any remaining dust with a lint-free cloth dampened in isopropyl
alcohol (75% solution) and rinse with warm deionized water. (A 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.
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.
6–4
THS710A, THS720A, THS730A & THS720P Service Manual
Maintenance
Removal and Installation Procedures
This section describes how to remove and install the major mechanical and
electrical modules. It provides the following information:
Preparation
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.
Please read the following warning statement. Then read the following general
instructions before removing a module.
WARNING. Only qualified personnel should perform service procedures. Before
doing this or any other procedure in this manual, read the General Safety
Summary and Service Safety Summary found at the beginning of this manual.
Also, to prevent possible injury to service personnel or damage to electrical
components, read Preventing ESD on page 6–1.
1. Read the Summary of Procedures on page 6–6 to understand which
procedure to use to access a given module. Then read Tools Required on
page 6–7 for a list of tools needed to remove and install modules in the
TekScope instrument.
2. If you are disassembling the TekScope instrument for cleaning, refer to the
Inspection and Cleaning procedure on page 6–2 for cleaning instructions.
List of Modules
The Mechanical Parts List chapter provides a list of all replaceable modules.
Any electrical or mechanical module, assembly, or part listed in the parts list is
referred to as a module.
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6–5
Maintenance
Summary of Procedures
Table 6–2 lists the removal and installation procedures in order of increasing
complexity.
Table 6–2: Removal and installation procedures
Procedure
Modules Accessed
Begins on Page
Tilt Stand
Tilt stand
6–8
Front-Panel Label
Front-panel label
6–10
Front Cover
Front cover
6–11
Display shield
Switch mat
Gasket
Handle
Battery door
Screws
Display Module
Display module
6–16
Inverter board
Back Cover
DC power hole plug
6–19
I/O port hole plug
Back cover / back label / battery contact
assembly
Complete Disassembly
Chassis / BNC connectors / banana jacks
6–23
Main board
Switch flex-circuit assembly
Display cable
Inverter board cable
Foam pad set2
2
6–6
Some pieces in the foam pad set are accessed by the Front Cover and Back Cover
procedures.
THS710A, THS720A, THS730A & THS720P Service Manual
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 1@4 inch flat blade
H
Screwdriver with 1@8 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 1@4 inch flat-bladed screwdriver to remove the tilt stand.
STOP. You do not have to remove the tilt stand to access internal modules. In
most cases, you do not have to remove the tilt stand to clean the TekScope
instrument exterior.
Removal. Use this procedure to remove a defective tilt stand.
1. Place the TekScope instrument face down on a soft surface (such as an
anti-static mat).
2. Insert the 1@4 inch flat-bladed screwdriver into the gap between the tilt stand
and instrument case as shown in Figure 6–1.
3. Twist the screwdriver gently to release one side of the tilt stand from the
instrument case. Take care not to damage the case.
Figure 6–1: Removing the tilt stand
6–8
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.
1 Insert hinge pin into the socket.
2 Rotate the tilt stand to slide the
second hinge pin into its socket.
Figure 6–2: Installing the tilt stand
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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.
THS710A, THS720A, THS730A & THS720P Service Manual
6–11
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
Front cover
Figure 6–5: Assembling a new front cover
d. Install a new gasket into the groove around the edge of the front cover.
As shown in Figure 6–6, start the gasket at the bottom of the cover
leaving a short (18@ inch) tail through the slot. Carefully press the gasket
into place around the rim with the 1@8 inch flat-bladed screwdriver. To
finish the installation, overlap the starting point and then pass the end of
the gasket through the remaining slot. Trim the ending tail to 18@ inch
length with the sharp knife.
THS710A, THS720A, THS730A & THS720P Service Manual
6–13
Maintenance
Gasket material
Front cover
Trim tails to 1@8 inch
Overlap gasket material
Figure 6–6: Installing the gasket
5. Slip the handle into the guides of the back cover as shown in Figure 6–7.
6. Place the front cover assembly onto the instrument. Taking care not to pinch
the handle, align it into the guides in the front cover. Align the buttons so
they all protrude through the holes in the front cover.
7. Holding the case together, pick it up and place it front side down on a soft
surface.
6–14
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Maintenance
Velcro strip
Fold end of handle over
Figure 6–7: Installing the handle
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6–15
Maintenance
CAUTION. To avoid cross-threading or cutting new threads with the screws,
carefully follow the procedure in the next step.
8. To install the four screws, follow these steps:
a. Place the screws into their holes in the back cover.
b. Using the torque-limiting Torx T-15 screwdriver, slowly turn each
screw backward (counterclockwise) until you feel the thread drop and
then gently tighten the screw (turn clockwise) into the existing thread.
c. When all four all screws are in, hold a corner of the case together firmly
to compress the gasket while tightening its screw until snug. Repeat for
the other corners. Do not overtighten the screws (12 in ⋅ lbs or 1.m N ⋅ m
maximum torque).
9. Replace the battery as shown on page 2–2, and then close the battery door.
Display Module
You will need a 18@ inch flat-bladed screwdriver to remove the display module
and inverter board.
Removal. First remove the front cover and switch mat using the procedure on
page 6–11. Then, use the following procedure to remove the display module and
inverter board.
1. Fold the switch flex-circuit assembly toward you to expose the display
module and inverter board.
CAUTION. To avoid scratching the surface of the display module, do not let it
touch any hard object.
The display module surface may scratch easily. To clean it, first try pressurized
air. If a soft cloth is required to clean it, use very light pressure.
2. To remove the inverter board, unplug the input and output connectors and
then lift the inverter board off the two guideposts. You may want to use the
1@ inch flat-bladed screwdriver to help release the connectors from their
8
sockets.
3. To remove the display module, follow these steps:
a. Disconnect the cable from the display module to the inverter board, if it
is not already disconnected.
b. Lift the right side of the display module out of the chassis and fold the
display module to the left, as shown in Figure 6–8.
6–16
THS710A, THS720A, THS730A & THS720P Service Manual
Maintenance
Display module
Display cable connector
Inverter board
Spring
Switch flex-circuit board
Figure 6–8: Removing the display module
c. Using the 1@8 inch flat-bladed screwdriver, carefully open the displaycable 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 1@8 inch flat-bladed
screwdriver to close the connector. Check that the display cable is fully
inserted into the connector.
4. Fold the display module back into the chassis and seat it between the foam
pads.
5. Plug the cable from the display module into the inverter board and then route
the cable in the channels as shown in Figure 6–10.
6. Place the inverter board into its cavity over the guideposts in the chassis.
7. Reconnect the connector to the bottom of the inverter board and route the
wires as shown in Figure 6–10.
8. If you just installed a new display module, peel off the protective plastic
sheet.
9. Fold the switch flex-circuit assembly back over the display module and
inverter board.
10. Install the switch mat and front cover using the procedure on page 6–12.
6–18
THS710A, THS720A, THS730A & THS720P Service Manual
Maintenance
Display module
Inverter output
connector
Route cable
through channels
Inverter board
Inverter input
connector
Route cable
through channel
Route cable
under clip
Figure 6–10: Routing cables to the inverter board
Back Cover
You will need a 18@ inch flat-bladed screwdriver and needle-nose pliers to remove
the chassis assembly and hole plugs from the back cover.
NOTE. The back labels and battery contacts are an integral part of the back
cover. If any of these parts are defective, the back cover must be replaced.
Removal. First remove the front cover and switch mat using the procedure on
page 6–11. Then, use the following procedure to remove the chassis assembly.
1. Place the instrument back-side down on a soft surface.
2. Lift the battery connector, located on the handle-side of the chassis, off its
retaining pins and disconnect the connector.
3. Insert the 1@8 inch flat-bladed screwdriver between the back cover and chassis
at the location shown in Figure 6–11.
THS710A, THS720A, THS730A & THS720P Service Manual
6–19
Maintenance
4. Carefully lift the bottom of the chassis out of the back cover. As the chassis
assembly comes out, pull it toward you to back the BNC connectors out of
their holes in the back cover.
Figure 6–11: Lifting the chassis
5. When the chassis is free from the back cover, set it aside with the main board
facing down on a soft, static-free surface.
6. To remove a defective DC power hole plug or I/O port hole plug, follow
these steps:
a. From the outside of the back cover, pull on the hole plug.
b. From the inside of the back cover, use the 1@8 inch flat-bladed screwdriver
to work each retaining tab out of its hole in the back cover.
Installation. Use this procedure to install the hole plugs and chassis assembly into
the back cover.
1. To install a new hole plug, insert the retaining tabs into their holes in the
back cover. While pushing on the plug from the outside, pull gently on the
tabs from the inside with the needle-nose pliers until they lock into place.
2. To install the chassis assembly into the back cover, follow these steps:
a. If the instrument was completely disassembled, check that the chassis is
properly assembled.
b. Check that all foam pads inside the back cover are correctly installed.
Refer to Figure 6–12 for the correct locations.
6–20
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Maintenance
Install DC power
hole plug
Install foam pads
Install foam pad
Install I/O port
hole plug
Install foam pad
Install foam pads
Figure 6–12: Foam pad and hole plug locations on the back cover
c. Place the back cover on a soft surface with the BNC connector openings
facing away from you.
d. Dress the battery wires to the left side of the back cover to provide
clearance for the chassis.
e. While inserting the BNC connectors into their openings, lower the
chassis into the back cover.
f.
Reconnect the battery wire connector and press it onto its retaining pins.
Check that the polarity of the connector is correct. Dress the wires into
the channel on the chassis as shown in Figure 6–13.
3. Install the switch mat and front cover using the procedure on page 6–12.
THS710A, THS720A, THS730A & THS720P Service Manual
6–21
Maintenance
Retain connectors
between pins
Locate ferrite
bead in cavity
Dress wires from battery
pack through slots
Figure 6–13: Routing the battery wires
6–22
THS710A, THS720A, THS730A & THS720P Service Manual
Maintenance
Complete Disassembly
You will need a 1@8 inch flat-bladed screwdriver and needle-nose pliers to remove
modules mounted to the the chassis.
Removal. First, remove the front cover and switch mat using the procedure on
page 6–11. Next, remove the chassis assembly using the procedure on page
6–19. Then, use the following procedure to disassemble the chassis.
STOP. If you are disassembling only for cleaning, inspect the chassis assembly to
determine whether further disassembly is required to perform internal cleaning.
If so, then proceed.
1. Remove the display module and inverter board using the procedure on
page 6–16.
2. With the switch flex-circuit assembly folded toward you, place the chassis
assembly on a soft, static-free surface with the main board side facing up.
3. To remove the main board and switch flex-circuit assembly from the chassis,
follow these steps:
a. Use the needle-nose pliers to remove both coaxial connectors from the
back side of the BNC connectors. Be careful not to crush the cable.
b. Use the 1@8 inch flat-bladed screwdriver to open the display cable
connector on the main board and then disconnect the display cable. Refer
to Figure 6–9 on page 6–18 if necessary.
c. Dress the battery cable outward to free it from obstructions.
d. Following the sequence (circled numbers) shown in Figure 6–14, lift
gently on the edges of the main board while releasing the board-retaining
snaps.
CAUTION. To prevent damage to the flex circuit, take care not to twist the flex
circuit at its connection to the main board.
e. When all six snaps are released, lift the main board and switch flex-circuit assembly out of the chassis enough to access the back side of the
banana jacks.
f.
Use the needle-nose pliers to remove both wires from the back side of
the banana jacks. Be careful not to deform the connectors attached to the
wires.
g. Complete the removal of the main board and switch flex-circuit
assembly and then place it on a soft, static-free surface with the two
metal shields facing up.
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6–23
Maintenance
Unplug connectors
Battery cable
Unplug connectors
6
5
4
3
1
2
Display
module cable
Lift here
Figure 6–14: Removing the main board and switch flex-circuit assembly
4. To remove the switch flex-circuit assembly from the main board, follow
these steps:
a. With the main board laying flat from the previous step, raise the switch
flex-circuit assembly to an upright position.
b. While holding the flex-circuit assembly upright, use both thumbs and
forefingers to grasp the left and right sides of the connector.
c. Carefully, alternate pulling on the left and right sides of the connector to
work it out of its socket. Do not pull one side out much farther than the
other or bent pins may result.
5. To remove the inverter board cable from the main board, unplug it.
NOTE. The BNC connectors and banana jacks are an integral part of the chassis.
If any of these connectors are defective, the chassis must be replaced.
6–24
THS710A, THS720A, THS730A & THS720P Service Manual
Maintenance
Installation. Use this procedure to reassemble the entire instrument.
1. Check that the ten foam pads on the chassis are correctly installed. The foam
pads that surround the display module should be aligned to locating marks in
the chassis. Refer to Figure 6–15 for the locations of all the foam pads.
Typical locating marks
Align this foam pad with
bottom edge of chassis
Figure 6–15: Foam pad locations on the chassis
2. Place the main board on a soft, static-free surface with the two metal shields
facing up and away from you.
3. Install the inverter board cable (either end) into its connector (J7) on the
main board.
4. To reconnect the switch flex-circuit assembly to the main board, follow these
steps:
a. Hold the switch flex-circuit assembly upright with the carbon contacts
facing you.
b. Use both thumbs and forefingers to grasp the left and right sides of the
connector.
c. From both sides, push the connector into its socket. You may need to
alternate pushing on the left and right sides to insert the connector.
THS710A, THS720A, THS730A & THS720P Service Manual
6–25
Maintenance
5. To prepare the main board and switch flex circuit board for installation into
the chassis, follow these steps:
a. Fold the switch flex-circuit assembly toward you.
b. Dress the battery wires away from you.
c. Dress the two coaxial cables that will connect to the BNC connectors to
a position under the main board.
d. Dress the two wires that will connect to the banana jacks to a position
under the main board.
6. To install the main board and switch flex-circuit assembly into the chassis,
follow these steps:
a. Place the chassis on a soft, static-free surface with the BNC connectors
facing away from you and the banana jacks facing left.
b. Lift the main board and switch flex-circuit assembly together and turn
them over keeping the switch flex-circuit assembly facing you.
c. Place the main board and switch flex-circuit assembly on the chassis so
that you can attach the two wires to the back of the banana jacks.
d. Use the needle-nose pliers to attach both wires to the back side of the
banana jacks. Be careful not to deform the connectors attached to the
wires. Dress the wires so that they will fit between the main baord and
the chassis.
e. Insert the four tabs on the left side of the main board into their rectangular holes in the chassis as shown in Figure 6–16.
f.
While lowering the right side of the main board, dress the battery wires
into the slot in the chassis.
g. When the main board is lowered in place, snap it into the six retaining
snaps of the chassis.
h. Use the needle-nose pliers to insert both coaxial connectors into the back
side of the BNC connectors. Be careful not to crush the cable or bend the
center conductor.
6–26
THS710A, THS720A, THS730A & THS720P Service Manual
Maintenance
Insert circuit board tabs
into chassis holes
Route battery cable into
slot in chassis (not shown)
Figure 6–16: Reassembling the chassis
7. To install the display cable, follow these steps:
a. Use the 18@ inch flat-bladed screwdriver to open the connector on the
main board.
b. With the conductive contacts facing away from the main board, insert the
display cable into its connector.
c. Use the 1@8 inch flat-bladed screwdriver to close the connector and then
check that the display cable is fully inserted into the connector.
d. Dress the display cable down through the slot in the chassis.
8. Turn the chassis assembly over so that the main board is facing down.
9. Install the display module and inverter board using steps 1 through 9 of the
procedure on page 6–18.
10. Install the chassis assembly into the back cover using steps 1 and 2 of the
procedure on page 6–20.
11. Install the switch mat and front cover using the procedure on page 6–12.
12. If detached, install the tilt stand using the procedure on page 6–9.
This completes the reassembly of the instrument.
THS710A, THS720A, THS730A & THS720P Service Manual
6–27
Maintenance
Troubleshooting
This section contains information and procedures to help you isolate a defective
module in the TekScope instrument.
WARNING. Before doing this or any other procedure in this manual, read the
General Safety Summary and Service Safety Summary found at the beginning of
this manual. Also, to prevent possible injury to service personnel or damage to
electrical components, read Preventing ESD on page 6–1.
Adjustment After Repair
Required Tools and
Equipment
Begin Here
If you replace the main board, you must adjust the instrument after repair. Refer
to the chapter Adjustment Procedures for information about adjustment.
You may need the the following tools and equipment to troubleshoot the
instrument.
Tools and Equipment
Example
AC adapter
Standard accessory to TekScope instrument
Battery pack, fully charged
Standard accessory to TekScope instrument
Oscilloscope with 10X probe
Tektronix TDS 300- or TDS 400-series with standard
accessory probe
DMM
Tektronix DMM200- or DMM300-series handheld
multimeter
1@ inch flat-bladed screwdriver
8
Hunter 30312
Metal paper clip
Common office accessory
Begin with these steps to isolate a defective module. Some steps direct you to
other procedures in this section.
1. Install a charged battery, connect the AC adapter, and then turn on the
TekScope instrument. If (after a short wait) the display backlight turns on
and the display appears to operate normally, then skip to Executing
Diagnostics on page 6–35.
2. If (after a short wait) the display backlight turns on but the display shows
any of the following symptoms, turn off the instrument immediately. Skip to
Display on page 6–33.
6–28
H
Display color is dark blue or violet when viewed straight on
H
Display color is abnormal (green or orange) when viewed straight on
THS710A, THS720A, THS730A & THS720P Service Manual
Maintenance
H
Displayed information is interrupted by static horizontal or vertical lines
or stripes
3. If (after a short wait) you can see that the display operates normally but the
display backlight does not turn on, then skip to Backlight on page 6–32.
4. If the instrument does not appear to turn on (no display backlight, no sound
of relay clicks, no displayed information), then continue with step 5.
5. Disconnect the AC adapter from the instrument. Remove the front cover
using the procedure Front Cover on page 6–11.
6. Reinstall the battery (removed in the Front Cover procedure).
7. Verify that the battery connector is properly connected. See Figure 6–17.
CAUTION. To avoid damage to the battery or battery contacts, be careful not to
short the conductors at the battery connector.
Test here
Figure 6–17: Battery connector location
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6–29
Maintenance
8. With the AC adapter still disconnected, use a DMM to measure the DC
voltage at the battery connector. Follow the instructions in the table below.
Voltage Measurement at Battery
Connector
Instructions
Approximately 0 VDC
Check that the battery is installed correctly.
Remove the battery and measure its voltage. You
should measure an open-circuit voltage >4.8 VDC
across a fully charged battery.
If the battery is charged, the battery contacts inside
the back cover are probably defective. Replace the
back cover assembly.
Greater than 0 VDC but less than 4 VDC
Remove the battery and measure its voltage. The
open-circuit voltage across a good battery should
measure >4 VDC, even if not fully charged.. If it
remains <4 VDC, the battery may be defective.
Replace it.
If the battery is fully charged (open-circuit voltage
>4.8 VDC) but the voltage under load is <4 VDC, the
main board is drawing excessive current. Replace
the main board.
Greater than 4 VDC (check both mating
connectors)
Remove the battery and then proceed with step 9.
9. With the battery removed from the instrument, reattach the AC adapter to the
instrument. Measure the DC voltage at the battery connector. Follow the
instructions in the table below.
Voltage Measurement at Battery
Connector
Instructions
Less than 1 VDC
Check that the AC adapter is connected correctly.
Disconnect the AC adapter and measure its output
voltage. If the voltage is less than 12 VDC, the AC
adapter is probably defective. Replace it.
Greater than 1 VDC
Proceed with step 10.
10. Reinstall the battery. Leave the AC adapter connected to the instrument.
11. Use a 1@8 inch flat-bladed screwdriver to lift the lower edge of the chassis
assembly out of the back cover just until the connector from the flex-circuit
assembly to the main board is accessible.
6–30
THS710A, THS720A, THS730A & THS720P Service Manual
Maintenance
12. Using a bent paper clip, momentarily short pins 15 and 17 of the connector
to bypass the ON/STBY switch as shown in Figure 6–18. Follow the
instructions in the table below.
Instrument Behavior
Instructions
Instrument turns on
Inspect and/or clean the switch flex-circuit assembly
and the switch mat. If cleaning does not solve the
problem, one or the other are defective. Replace
them both.
Instrument does not turn on
The main board is probably defective.
Replace it.
Pin 15
Pin 17
Figure 6–18: Bypassing the ON/STBY switch
THS710A, THS720A, THS730A & THS720P Service Manual
6–31
Maintenance
Backlight
Follow these steps to troubleshoot a nonfunctional backlight.
1. Remove the front cover using the procedure Front Cover on page 6–11.
2. Turn the instrument on, remove the switch mat, and then fold the switch
flex-circuit assembly toward you to access the inverter board.
WARNING. To avoid electrical shock, do not touch the two-wire output connector
of the inverter board. The output connector is the one closest to the display
module.
3. Using a DMM, measure the DC voltage across pins 1 and 2 of the input
connector on the inverter board. Follow the instructions in the table below.
Voltage Measurement at Inverter
Input Connector
Approximately 0 VDC
Instructions
Check that the inverter input cable is properly
connected at both ends.
Fold the switch flex-circuit assembly back over the
instrument. Use a 1@8 inch flat-bladed screwdriver to
lift the lower edge of the chassis assembly out of
the back cover until you access the edge of the
main board.
Remove the inverter input cable from the main
board. Measure the DC voltage on pins 1 and 2 of
the connector on the main board.
If the measured voltage is approximately 12 VDC,
the inverter input cable is defective. Replace it.
If the measured voltage is approximately 0 VDC, the
main board is probably defective. Replace it.
Approximately 12 VDC
Proceed with step 4.
4. Using an oscilloscope and 10X probe, attach the probe ground lead to the
ground terminal on the right side of the instrument. Set the oscilloscope time
base to 1 ms/div and vertical sensitivity to 1 V/div.
NOTE. The inverter output voltage is approximately a 250 VRMS , 40 kHz sine
wave. Capacitive coupling to the oscilloscope probe tip is sufficient to determine
if the inverter output voltage is present.
6–32
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Maintenance
5. Hold the probe tip above the output connector of the inverter board. Do not
touch the probe tip to either of the conductors in the connector. Follow the
instructions in the table below.
Display
Oscilloscope Display
Instructions
No signal displayed
The inverter board is probably defective.
Replace it.
Approximately 40 kHz sinewave displayed
The display module is probably defective.
Replace it.
Follow these steps to troubleshoot a nonfunctional display.
1. Remove the front cover using the procedure Front Cover on page 6–11.
2. Remove the display module and inverter board using the procedure Display
Module on page 6–16.
3. Fold the switch flex-circuit board back over the instrument and reinstall the
switch mat.
4. Connect the AC adapter to the instrument
5. Turn the instrument on, remove the switch mat, and then fold the switch
flex-circuit assembly toward you to access display cable.
NOTE. Without the display module installed, the simplest way to verify that the
instrument is on is to probe the PROBE COMP output with an oscilloscope. If
the instrument is on, the PROBE COMP output generates approximately a 5 V,
1.2 kHz squarewave.
6. Use an oscilloscope and 10X probe to probe the contacts on the loose end of
the display cable. The table below describes the signals you should expect to
see. If some or all of the signals are not present, then skip to step 9.
Signal at Loose End of Display Cable
Description
Pin 1 (closest to bottom of
instrument)
No signal, might appear noisy
Pin 2
No signal, might appear noisy
Pin 3
Digital data, high = 5 V, low = 0 V
Pin 4
Digital data, high = 5 V, low = 0 V
Pin 5
Digital data, high = 5 V, low = 0 V
Pin 6
Digital data, high = 5 V, low = 0 V
THS710A, THS720A, THS730A & THS720P Service Manual
6–33
Maintenance
Signal at Loose End of Display Cable
Description
Pin 7
–10 VDC to –22 VDC
Pin 8
0 V (ground)
Pin 9
+5 VDC
Pin 10
1.89 MHz clock (528 ns period), ≈ 50% duty cycle,
appears in bursts, high = 5 V, low = 0 V
Pin 11
19.3 kHz clock (51.7 ms period), ≈ 16% duty cycle,
high = 5 V, low = 0 V
Pin 12 (closest to BNC end of
instrument)
75.5 Hz clock (13.2 ms period), ≈ 0.4% duty cycle,
high = 5 V, low = 0 V
7. If all the signals are present on the loose end of the connector, turn the
instrument off and then reinstall the display module using the procedure on
page 6–18.
8. Turn the instrument on. If the problem persists, the display module is
probably defective. Replace it.
9. Remove the chassis assembly from the back cover using the procedure Back
Cover on page 6–19.
10. Place the chassis assembly on a soft, static-free surface with the main board
facing up and the switch flex-circuit assembly folded out toward you. Install
the switch mat on the switch flex-circuit assembly.
11. Check, and if necessary, reconnect the display cable connection to the main
board. Inspect the display cable for any sign of damage; if damage is
evident, replace it.
12. Connect the AC adapter to the instrument and turn it on. Verify that the
instrument is on by probing the PROBE COMP output.
13. Probe the display signals at the display connector of the main board as was
done in step 6.
14. If some or all of the signals are not present at the main board display
connector, the main board is probably defective. Replace it.
6–34
THS710A, THS720A, THS730A & THS720P Service Manual
Maintenance
Executing Diagnostics
Follow these steps to troubleshoot using diagnostics.
1. To execute the internal diagnostic tests, remove all input signals from the
instrument and then perform the following steps:
SCOPE
UTILITY
System
Diag
Loop
Once
Execute
—
OK Run Test
2. A dialog box displays the result when the diagnostic tests completes. If any
test fails, the main board is probably defective. Replace it.
3. If all tests pass, press the CLEAR MENU button to continue operation.
4. You should be able to compensate the signal path of a functioning instrument. To execute Signal Path Compensation, remove all input signals from
the instrument and then perform the following steps:
SCOPE
UTILITY
System
Cal
Signal Path
—
OK Compensate Signal
Paths
5. If Signal Path Compensation does not complete successfully, perform the
Factory Cal Scope adjustment on page 5–5 and then repeat step 4.
6. If all tests pass, press the CLEAR MENU button to continue operation.
7. If trouble persists, proceed to Input Connections.
THS710A, THS720A, THS730A & THS720P Service Manual
6–35
Maintenance
Input Connections
Follow these steps to troubleshoot the input connections only if the following
condition is true: the instrument appears to function normally in every way
except you have determined that the channel 1, channel 2, or DMM signal is not
getting into the instrument as expected.
1. Remove the front cover using the procedure Front Cover on page 6–11.
2. Remove the chassis assembly from the back cover using the procedure Back
Cover on page 6–19.
3. Check that the coaxial connections to the back side of the channel 1 and
channel 2 BNC connectors are intact. Use the DMM to measure continuity
from the BNC connector to the end of the coaxial cable where it attaches to
the main board.
4. Check that the wire connections to the back side of the DMM and COM
banana jacks are intact. Use the DMM to measure continuity from the
banana jacks to the end of the wire where it attaches to the main board.
5. If no problem is found and the trouble persists, the main board is probably
defective in some way that the internal diagnostics cannot detect. Replace it.
6–36
THS710A, THS720A, THS730A & THS720P Service Manual
Maintenance
Other Troubleshooting
Use these techniques to troubleshoot other parts of the instrument.
Buttons. Press each of the front-panel buttons to verify that it operates properly.
The table below lists the buttons that depend on a particular instrument state for
you to see an effect when the button is pressed. Unless noted otherwise, the
instrument should be in scope mode for this test.
Button
Precondition
Expected Behavior
HARD COPY
None
With no connection to the
RS-232 port, a message
will appear approximately
10 seconds after HARD
COPY is pressed
Any bezel button
Press DISPLAY first
Displays pop-up menu
CLEAR MENU
Press DISPLAY first
Removes menu
SCOPE
Press METER first
Changes to scope mode
+/– Rocker
Press CURSOR and then
choose Function V Bars first
Cursor moves
TOGGLE
Press CURSOR and then
choose Function V Bars first
Changes active cursor
WAVEFORM OFF
Press CH 1 first
Removes waveform
VERTICAL MENU
Press CH 1 first
Displays menu
VOLTS/DIV
Press CH 1 first
Changes sensitivity
VERTICAL POSITION
Press CH 1 first
Repositions waveform
TRIGGER LEVEL
Press CH 1 first
Changes trigger level
SET LEVEL TO 50%
Adjust TRIGGER LEVEL first
Resets trigger level
If any button fails to operate, inspect and/or clean the switch flex-circuit
assembly and the switch mat. If cleaning does not solve the problem, the switch
flex-circuit assembly, switch mat, or main board may be defective. Use the
procedure below to isolate the problem:
1. Replace the switch flex-circuit assembly and then retest the buttons. If the
problem persists, proceed to step 2.
2. Replace the switchmat and then retest the buttons. If the problem persists,
proceed to step 3.
3. Replace the main board.
THS710A, THS720A, THS730A & THS720P Service Manual
6–37
Maintenance
PROBE COMP Output. When the instrument is on, the PROBE COMP output
should generate a square wave, approximately 5 V in amplitude, at a 1.2 kHz
frequency. Use the oscilloscope and a 10X probe to probe this output. If the
signal is not present, the main board is probably defective. Replace it.
RS-232 Port. Verify that the RS-232 port operates properly. The easiest way to
test the port is to make a hard copy with a compatible printer and RS-232 cable.
To prepare to make a hard copy, verify the following statements:
H
The printer is compatible with one of the supported formats: Deskjet,
DPU 411/II, DPU 412, Epson 9-pin, Epson 24-pin, Laserjet, or Thinkjet.
H
The printer is equipped with a serial (RS-232) port.
H
The printer is connected to the instrument through a known good RS-232
cable and adapter (if needed).
H
The printer is powered on and paper is loaded.
H
The printer baud rate setting is known.
Set up the instrument and start the hard copy with the following steps:
SCOPE
UTILITY
HARD COPY
1
System
RS-232
Set RS232 Parameters To Defaults
—
Baud rate
—
Set baud rate to
match printer baud
rate
System
Hard Copy
—
Format
Choose format to
match printer 1
OK Select Format
—
—
—
You may need to press Select Page to display additional printer formats.
If the RS-232 port is defective, replace the main board.
6–38
THS710A, THS720A, THS730A & THS720P Service Manual
Maintenance
Battery and External Power. Verify the battery and external power with the
following procedure:
NOTE. If the instrument runs normally under battery power but only for a short
time, the battery may have lost its capacity to hold a charge. You may be able to
recover some of its capacity by repeatedly charging and then completely
discharging the battery several times. If several charge/discharge cycles do not
improve the battery life, it should be replaced.
1. Install a fully charged battery and connect the AC adapter to the instrument.
2. Turn the instrument on.
3. Disconnect the AC adapter plug from the instrument. If the instrument turns
off, then battery power is not working. Go back to step 5 on page 6–29 to
troubleshoot the problem.
4. While the instrument is running, reconnect the AC adapter and then remove
the battery. If the instrument turns off then external power is not working.
Disconnect the AC power adapter from the instrument and use a DMM to
measure its DC output voltage. Follow the instructions in the table below.
AC Adapter Voltage Measurement
Instructions
Less than 12 VDC
The AC adapter is probably defective.
Replace it.
Greater than 12 VDC
The main board is probably defective.
Replace it.
THS710A, THS720A, THS730A & THS720P Service Manual
6–39
Maintenance
Unpacking and Repacking Instructions
This section contains the information needed to unpack the TekScope instrument
and repack it for shipment or storage.
Unpacking
The TekScope instrument and its standard accessories are carefully packed at the
factory in a padded case, which is enclosed in a shipping carton. If, upon receipt,
damage to the shipping carton is evident, notify the shipper. Tektronix, Inc. is
not responsible for damage caused during shipping.
If you have not already done so, carefully remove the TekScope instrument and
its accessories from the padded case and inspect them for damage. Save the
shipping carton for repacking or storage.
Repacking
Use a corrugated cardboard shipping carton having a test strength of at least
275 pounds (125 kg) and with an inside dimension at least six inches (15.25 cm)
greater than the instrument dimensions.
If the instrument is being shipped to a Tektronix Service Center, enclose the
following information:
H
The owner’s address
H
Name and phone number of a contact person
H
Type and serial number of the instrument
H
Reason for returning
H
A complete description of the service required
Seal the shipping carton with an industrial stapler or strapping tape.
Mark the address of the Tektronix Service Center and also your own return
address on the shipping carton in two prominent locations.
Storage
The TekScope instrument should be stored in a clean, dry environment. The
following environmental characteristics apply for both shipping and storage
(instrument not operating):
H
Temperature range: –20° C to +60° C
H
Altitude: To 15,000 m
See the chapter Specifications for a complete listing of the environmental
charactertistics.
6–40
THS710A, THS720A, THS730A & THS720P Service Manual
Options
The TekScope instrument options provide AC adapters, User Manuals, and
Reference Manuals for international customers. Table 7–1 describes these
options.
Table 7–1: TekScope instrument options
Option
Description
A1
Universal European AC adapter, 220 V
A2
United Kingdom AC adapter, 240 V
A6
Japan AC adapter, 100 V
L1
French-language User and Reference Manuals
L2
Italian-language User and Reference Manuals
L3
German-language User and Reference Manuals
L4
Spanish-language User and Reference Manuals
L5
Japanese-language User Manual, English-language Reference
L6
Portuguese-language User and Reference Manuals
L7
Simple Chinese-language User and Reference Manuals
L8
Standard Chinese-language User and Reference Manuals
L9
Korean-language User and Reference Manuals
1B
Includes THS7BAT and THS7CHG for European 220 V
2B
Includes THS7BAT and THS7CHG for United Kingdom 240V
3B
Includes THS7BAT and THS7CHG for North American 120V
THS710A, THS720A, THS730A & THS720P Service Manual
7–1
Options
7–2
THS710A, THS720A, THS730A & THS720P Service Manual
Electrical Parts List
Refer to the Mechanical Parts List chapter for a complete listing and description
of replaceable parts for the TekScope instrument.
THS710A, THS720A, THS730A & THS720P Service Manual
8–1
Electrical Parts List
8–2
THS710A, THS720A, THS730A & THS720P Service Manual
Diagrams
See Figure 3–1 on page 3–2 for a block/interconnect diagram of the TekScope
instrument. There are no additional diagrams in this chapter.
THS710A, THS720A, THS730A & THS720P Service Manual
9–1
Diagrams
9–2
THS710A, THS720A, THS730A & THS720P Service Manual
Mechanical Parts List
This section contains a list of the replaceable modules for the TekScope
instrument. Use this list to identify and order replacement parts.
Parts Ordering Information
Replacement parts are available through your local Tektronix field office or
representative.
Changes to Tektronix products are sometimes made to accommodate improved
components as they become available and to give you the benefit of the latest
improvements. Therefore, when ordering parts, it is important to include the
following information in your order.
H
Part number (see Part Number Revision Level below)
H
Instrument type or model number
H
Instrument serial number
H
Instrument modification number, if applicable
If you order a part that has been replaced with a different or improved part, your
local Tektronix field office or representative will contact you concerning any
change in part number.
Change information, if any, is located at the rear of this manual.
Part Number Revision
Level
Tektronix part numbers contain two digits that show the revision level of the
part. For most parts in this manual, you will find the letters XX in place of the
revision level number.
Part Number Revision Level
670-7918-03
Revision Level May Show as XX
670-7918-XX
When you order parts, Tektronix will provide you with the most current part for
your product type, serial number, and modification (if applicable). At the time of
your order, Tektronix will determine the part number revision level needed for
your product, based on the information you provide.
THS710A, THS720A, THS730A & THS720P Service Manual
10–1
Mechanical Parts List
Module Servicing
Modules can be serviced by selecting one of the following three options. Contact
your local Tektronix service center or representative for repair assistance.
Module Exchange. In some cases you may exchange your module for a remanufactured module. These modules cost significantly less than new modules and
meet the same factory specifications. For more information about the module
exchange program, call 1-800-TEK-WIDE, extension 6630.
New Modules. You may purchase replacement modules in the same way as other
replacement parts.
Using the Replaceable Parts List
This section contains a list of the mechanical and/or electrical components that
are replaceable for the TekScope instrument. Use this list to identify and order
replacement parts. The following table describes each column in the parts list.
Parts List Column Descriptions
Column
Column Name
Description
1
Figure & Index Number
Items in this section are referenced by figure and index numbers to the exploded view
illustrations that follow.
2
Tektronix Part Number
Use this part number when ordering replacement parts from Tektronix.
3 and 4
Serial Number
Column three indicates the serial number at which the part was first effective. Column four
indicates the serial number at which the part was discontinued. No entries indicates the part is
good for all serial numbers.
5
Qty
This indicates the quantity of parts used.
6
Name & Description
An item name is separated from the description by a colon (:). Because of space limitations, an
item name may sometimes appear as incomplete. Use the U.S. Federal Catalog handbook
H6-1 for further item name identification.
7
Mfr. Code
This indicates the code of the actual manufacturer of the part.
8
Mfr. Part Number
This indicates the actual manufacturer’s or vendor’s part number.
Abbreviations
Mfr. Code to Manufacturer
Cross Index
10–2
Abbreviations conform to American National Standard ANSI Y1.1–1972.
The table titled Manufacturers Cross Index shows codes, names, and addresses
of manufacturers or vendors of components listed in the parts list.
THS710A, THS720A, THS730A & THS720P Service Manual
Mechanical Parts List
Manufacturers Cross Index
Mfr.
Code
Manufacturer
Address
City, State, Zip Code
0BL82
CRT SCIENTIFIC
14746 RAYMER ST
VAN NUYS, CA 91405
0KB01
STAUFFER SUPPLY CO.
810 SE SHERMAN
PORTLAND, OR 97214-4657
1DM20
PARLEX CORP.
7 INDUSTRIAL WAY
SALEM, NH 03079
22670
GM NAMEPLATE, INC.
2040 15TH AVENUE WEST
SEATTLE, WA 98119-2783
53279
XENTEK, INC
1770 LA COSTA MEADOW DR.
SAN MARCOS, CA 92069
80009
TEKTRONIX, INC.
P.O. BOX 500
BEAVERTON, OR, 97077-0001
85471
BOYD CORP.
6136 NE 87TH AVENUE
PORTLAND, OR 97220
8X345
NORTHWEST SPRING AND MFG., INC.
5858 SW WILLOW LANE
LAKE OSWEGO, OR 97035
TK1163
POLY–CAST, INC.
9898 SW TIGARD ST.
TIGARD, OR 97223
TK2469
UNITREK CORP.
3000 LEWIS AND CLARK HWY., SUITE #2
VANCOUVER, WA 98661
TK2539
ROYAL CASE COMPANY, INC.
315 S. MONTGOMERY, P.O. BOX 2231
SHERMAN, TX 75070-5070
THS710A, THS720A, THS730A & THS720P Service Manual
10–3
Mechanical Parts List
Replaceable Parts List
Fig. &
Index
Number
Tektronix Part
Number
Serial No.
Effective
Serial No.
Discont’d
Qty
Name & Description
Mfr.
Code
Mfr. Part Number
10–1
334-9310-00
B010100
1
LABEL: FRONT PANEL (THS710A)
22670
334-9310-00
–1
334-9310-10
B010100
1
LABEL: FRONT PANEL (THS720A)
22670
334-9310-10
–1
334-9310-20
B010100
1
LABEL: FRONT PANEL (THS730A)
22670
334-9310-20
–1
334-9310-30
B010100
1
LABEL: FRONT PANEL (THS720P)
22670
334-9310-30
–2
437-0451-10
B010100
1
FRONT COVER (THS710A, THS720A, THS730A)
TK1163
437-0451-10
–2
437-0451-20
B010100
1
FRONT COVER (THS720P)
TK1163
437-0451-20
–3
337-4010-00
B010100
1
DISPLAY SHIELD: CLEAR LEXAN
85471
337-4010-00
–4
348-1475-00
B010100
1
GASKET: NEOPRENE, 35.0 X 0.045 OD
0KB01
348-1475-00
–5
260-2615-00
B010100
1
SWITCH MAT: ELASTOMERIC
0BL82
260-2615-00
–6
259-0098-00
B010100
1
SWITCH FLEX CIRCUIT ASSY
22670
259-0098-00
–7
119-4985-11
B010100
1
DISPLAY MODULE: LCD W/ BACKLIGHT
80009
119-4985-11
–8
214-4706-00
B010100
1
SPRING: 0.74 X 0.185 OD
8X345
214-4706-00
–9
348-1441-00
B010100
1
FOAM PAD SET
85471
348-1441-00
–10
671-3923-0X
B010100
1
CIRCUIT BD ASSY: MAIN (THS710A)
80009
671-3923-0X
–10
671-3923-1X
B010100
1
CIRCUIT BD ASSY: MAIN (THS720A)
80009
671-3923-1X
–10
671-4010-0X
B010100
1
CIRCUIT BD ASSY: MAIN (THS730A)
80009
671-4010-0X
–10
671-3923-2X
B010100
1
CIRCUIT BD ASSY: MAIN (THS720P)
80009
671-3923-2X
–11
200-4214-00
B010100
1
BATTERY DOOR
TK1163
200-4214-00
–12
200-4267-00
B010100
1
HOLE PLUG SET: DC POWER AND I/O PORT
TK1163
200-4267-00
–13
213-1099-00
B010100
4
SCREW: THREAD FORMING, 1.79 X 31 MM, T-15 TORX
0KB01
213-1099-00
–14
334-8998-00
B010100
1
LABEL: BACK COVER, MARKED UL AND CE
22670
334-8998-00
–15
348-1426-00
B010100
1
TILT STAND ASSY
TK1163
348-1426-00
–16
437-0453-10
B010100
1
BACK COVER
TK1163
437-0453-10
–17
174-3487-01
B010100
1
CONTACT ASSY: BATTERY
TK2469
174-3487-01
–18
174-3366-01
B010100
1
CABLE ASSY: INVERTER TO MAIN BD, 5-CONDUCTOR
TK2469
174-3366-01
–19
174-3367-00
B010100
1
CABLE ASSY: DISPLAY TO MAIN BD, 12-CONDUCTOR
1DM20
1.00MM–12–3.5–B
–20
441-2066-01
B010100
1
CHASSIS ASSY: INCLUDES BNC CONNECTORS AND
BANANA JACKS
TK1163
441-2066-01
–21
671-3673-XX
B010100
1
CIRCUIT BD ASSY: INVERTER
80009
671-3673-XX
–22
346-0280-00
B010100
1
HANDLE: BLACK WEBBING (THS710A, THS720A, THS730A)
TK2539
346-0280-00
–22
346-0280-20
B010100
1
HANDLE: YELLOW WEBBING (THS720P)
TK2539
346-0280-20
10–4
THS710A, THS720A, THS730A & THS720P Service Manual
Mechanical Parts List
1
2
3
22
4
9
5
6
7
8
21
9
9
20
9
9
19
10
11
18
9
12
17
16
13
12
14
15
Figure 10–1: Exploded diagram
THS710A, THS720A, THS730A & THS720P Service Manual
10–5
Mechanical Parts List
Table 10–1 lists the replaceable standard accessories for the TekScope instrument
and the instrument options that included them in the original shipment. These
accessories are not shown in Figure 10–1.
Table 10–1: Replaceable standard accessories
10–6
Tektronix Part Number or
Nomenclature
Description of Accessory
Instrument Options That
Include the Accessory
P6117
Passive 10X probes
All
012-1482-00
Meter lead set
All
THS7BAT
Battery pack
All
119-4812-01
AC adapter (North American)
All except A1, A2, and A6
119-4813-01
AC adapter (Universal European)
A1 only
119-4922-01
AC adapter (UK)
A2 only
119-4923-01
AC adapter (Japan)
A6 only
012-1364-00
2 m RS-232 cable
All
103-0403-00
RJ-45 to 9-pin female adapter
All
016-1399-01
Soft case
All
070-9731-XX
User and Reference Manuals
(English)
All except L1 through L9
070-9732-XX
User and Reference Manuals
(French)
L1
070-9733-XX
User and Reference Manuals
(German)
L3
070-9734-XX
User and Reference Manuals
(Italian)
L2
070-9735-XX
User and Reference Manuals
(Korean)
L9
070-9736-XX
User and Reference Manuals
(Portuguese)
L6
070-9737-XX
User and Reference Manuals
(Spanish)
L4
070-9738-XX
User and Reference Manuals
(Simplified Chinese)
L7
070-9739-XX
User and Reference Manuals
(Traditional Chinese)
L8
070-9740-XX
User and Reference Manuals
(Japanese)
L5
THS710A, THS720A, THS730A & THS720P Service Manual
Mechanical Parts List
Table 10–1: Replaceable standard accessories (Cont.)
Tektronix Part Number or
Nomenclature
Description of Accessory
Instrument Options That
Include the Accessory
070-9741-XX
Replacement Reference
Manual only (English)
None
070-9742-XX
Replacement Reference
Manual only (French)
None
070-9743-XX
Replacement Reference
Manual only (German)
None
070-9744-XX
Replacement Reference
Manual only (Italian)
None
070-9745-XX
Replacement Reference
Manual only (Korean)
None
070-9746-XX
Replacement Reference
Manual only (Portuguese)
None
070-9747-XX
Replacement Reference
Manual only (Spanish)
None
070-9748-XX
Replacement Reference
Manual only (Simplified Chinese)
None
070-9749-XX
Replacement Reference
Manual only (Traditional
Chinese)
None
070-9799-XX
Replacement Reference
Manual only (Japanese)
None
THS710A, THS720A, THS730A & THS720P Service Manual
10–7
Mechanical Parts List
10–8
THS710A, THS720A, THS730A & THS720P Service Manual