Tektronix 7B53A User manual

Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077
070-1342-01
Product Group 42
lI!ktron~
COMMITTED TO EXCELLENCE
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAl.
7B53A/7B53AN
DUAL TIME BASE
INSTRUCTION MANUAL
/;< 1/:;-" t?~ ,)'-
First Printing SEP 1980
Revised MAY 1988

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Copyright @) 1972, 1980 Tektronix, Inc. All rights reserved.
Contents of this publication may not be reproduced in any
form without the written permission of Tektronix, Inc.
Products of Tektronix, Inc. and its subsidiaries are covered
by U.S. and foreign patents and/or pending patents.
TEKTRONIX, TEK, SCOPE-MOBILE, and " are
registered trademarks of Tektronix, Inc. TELEQUIPMENT
is a registered trademark of Tektronix U.K. Limited.
Printed in U.S.A. Specification and price change privileges
are reserved.
INSTRUMENT SERIAL NUMBERS
Each instrument has a serial number on a panel insert, tag,
or stamped on the chassis. The first number or letter
designates the country of manufacture. The last five digits
of the serial number are assigned sequentially and are
unique to each instrument. Those manufactured in the
United States have six unique digits. The country of
manufacture is identified as follows:
BOOOOOO
100000
200000
300000
700000
Tektronix, Inc., Beaverton, Oregon, USA
Tektronix Guernsey, Ltd., Channel Islands
Tektronix United Kingdom, Ltd., London
Sony/Tektronix, Japan
Tektronix Holland, NV, Heerenveen,
The Netherlands

7B53A/7B53AN
TABLE OF CONTENTS
Page
LIST OF ILLUSTRATIONS ................... . iii
LIST OF TABLES .......................... . iv
OPERATORS SAFETY SUMMARY ............ . v
SERVICE SAFETY SUMMARY ................ . vii
Section 1 SPECIFICATION. . . . . . . . . . . . . . . . .. 1-1
Section 2 OPERATING INSTRUCTIONS. . . . . . .. 2-1
Controls and Connectors .... . . . . . .. 2-1
Operating Checkout ..... . . . . . . . . .. 2-3
General Operating Instructions. . . . .
.. 2-6
Applications. . . . . . . . . . . . . . . . . . . .
.. 2-13
Repackaging for Shipment . . . . . . . .
.. 2-20
I WARNING I
The remaining portion of this Table of Contents lists the
servicing instructions. These servicing instructions are for
use
by qualified personnel only. To avoid electrical shock,
do
not perform anyservicing otherthan that called out in the
operating instructions unless qualified to do so.
Section 3 THEORY OF OPERATION
3-1
Simplified Block Diagram. . . . . . . . . 3-1
Circuit Operation .................. 3-3
Main Trigger
Preamp. . . . . . . . . . . . . .. 3-4
Main Trigger Generator
(SN B210000
& Up 7B53A Only) . . . . . . . . . . . . . . . .. 3-4
Main Trigger Generator (SN B209999
& Below) . . . . . . . . . . . . . . . . . . . . . . . .. 3-7
Main Sweep
Generator. . . . . . . . . . . .. 3-9
Delayed Trigger Generator
(SN B210000 & Up 7B53A Only) . . . .. 3-12
REV DEC 1982
Section 3 THEORY OF OPERATION
(cont'd)
Delayed Trigger Generator
Page
(SN B209999 & Below). . . . . . . . . . . .. 3-12
Delayed Sweep Generator . . . . . . . .
.. 3-12
Horizontal Preamp. . . . . . . . . . . . . . .
.. 3-17
Readout Switching
.... . . . . . . . . . . .. 3-18
Section 4 CALIBRATION. . . . . . . . . . . . . . . . . . .. 4-1
Test Equipment Required .. . . . . . . . .. 4-1
PART 1 PERFORMANCE CHECK. . .. 4-6
Trigger System Check. . . . . . . . . . . .
.. 4-7
Horizontal System Check . . . . . . . . .
.. 4-13
PART 2 ADJUSTMENT
............ 4-20
Trigger System Adjustment.
........ , 4-21
Horizontal System Adjustment. . . . . .. 4-24
Section 5 MAINTENANCE. . . . . . . . . . . . . . . . .. 5-1
Preventive Maintenance. . . . . . . . . . .. 5-1
Troubleshooting. . . . . . . . . . . . . . . . . .. 5-2
Corrective Maintenance
............ 5-4
Section 6 OPTIONS. . . . . . . . . . . . . . . . . . . . . . .. 6-1
Section 7 REPLACEABLE ELECTRICAL PARTS
Section 8 DIAGRAMS AND CIRCUIT BOARD
DESCRIPTIONS
Section 9 REPLACEABLE MECHANICAL PARTS

7B53AJ7B53AN
LIST OF ILLUSTRATIONS
Fig.
No.
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2-11
2-12
2-13
2-14
2-15
2-16
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
4-1
Page
7B53A17B53AN Dual Time Base ........ viii
Location of release latch. ........... 2-1
Front-panel controls and connectors. . .. 2-2
Frequency range of each COUPLING
switch position. .................. 2-7
Effect
of LEVEL control and SLOPE switch
on CRT display. . . . . . . . . . . . . . . . . .. 2-9
Composite Time/Division switch ....... 2-10
Area
of graticule used for accurate time
measurements. . . . . . . . . . . . . . . . . . .. 2-11
Operation of Sweep Magnifier. ....... 2-11
(A)
Intensified Sweep display; (B) Delayed
Sweep display .................. " 2-12
Typical Mixed Sweep display (DELAYTIME
MUL T dial set to 3.55) .............. 2-12
DELAY TIME MUL T dial. Reading shown
3.55 ........................... 2-12
Measuring the time duration between
points on a waveform. . . . . . . . . . . . .
.. 2-15
Measuring risetime ................ 2-16
Measuring time difference using delayed
sweep
........................ " 2-17
Using delayed sweep
for magnification. 2-18
Displaying a complex signal using delayed
sweep. . . . . . . . . . . . . . . . . . . . . . . .
.. 2-19
Measuring pulse jitter. ............. 2-20
7B53A17B53AN Simplified Block Diagram. 3-2
Trigger Preamp and Input Switching Block
Diagram. . . . . . . . . . . . . . . . . . . . . . .. 3-5
Main
Trigger Generator Block Diagram
(SN B210000 and up 7B53A only) ...... 3-6
Main
Trigger Generator Block Diagram
(SN B209999 and below). ........... 3-8
Main Sweep
Generator Block Diagram. 3-10
Delayed
Trigger Generator Block Diagram
(SN B210000 and up 7B53A only) ...... 3-13
Delayed
Trigger Generator Block Diagram
(SN B209999 and below) ............ 3-14
Delayed Sweep
Generator Block Diagram. 3-15
Horizontal Preamp Block Diagram ..... 3-17
Location of Delayed Gate Out and Variable
Selector mUlti-pin connectors ......... 4-2
@ JUN 1980
Fig.
No. Page
4-2
4-3
4-4
4-5
Typical delay time error measurement. .. 4-16
Typical Delay Time Error Figures ...... 4-17
Allowable Delay Time Error .......... 4-17
Typical CRT display when checking sweep
length. . . . . . . . . . . . . . . . . . . . . . . .
.. 4-25
4-6
5-1
5-2
Typical CRT display for adjIIIstment of Dly'd
Sweep Start and Dly'd Sweep Stop. . . .. 4-26
Location of pins on interface connector .. 5-3
Cam
Switch Removal. . . . . . . . . . . . . .. 5-7
The illustrations in Section 8 are located near their
associated diagrams on the foldout page.
8-1 Electrode configuration for
semiconductors in the instrument.
8-2 Location of circuit boards in the
7B53A17B54AN.
8-3 Partial
A1-lnterface circuit board
component locator (SN B090000 and up).
8-4 Partial A
1-lnterface circuit board
component locator (SN B089999 and
below).
8-5
A2-Source Switch circuit board
8-6
8-7
8-8
8-9
8-10
8-11
8-12
8-13
8-14
component locator.
A3-Coupling Switch circuit board
component locator.
Partial
A4- Trigger circuit board
component locator 7B53A only
(SN B210000 and up).
Partial
A4- Trigger circuit board
component locator (SN B209999 and
below).
Partial
A6-Sweep circuit board
component locator (SN B090000 and up).
Partial
A6-Sweep circuit board
component locator (SN B089999 and
below).
A5-Mode Switch circuit board.
Partial
A4- Trigger circuit board
component locator 7B53A only
(SN B210000 and up).
A7-Delayed Trigger Switch circuit board
com ponent locator.
Partial A4- Trigger circuit board
component locator (SN B209999 and
below).
iii

7B53A17B53AN
Fig.
No.
8-15
8-16
8-17
8-18
8-19
8-20
iv
LIST OF ILLUSTRATIONS (cont)
Fig.
No.
Partial A6-Sweep circuit board
component locator (SN 8090000 and up).
Partial A6-Sweep circuit board
component locator (SN 8089999 and
below).
8-21 Partial A6-Sweep circuit board
component locator (SN 8089999 and
below).
Partial A1-lnterface circuit board (7853A
only) component locator.
Partial A1-lnterface circuit board
(7853AN only) com ponent locator.
A8-Readout circuit board (7853A only)
component locator.
8-22
8-23
8-24
Partial A6-Sweep circuit board
component locator (SN 8090000 and up).
Location of adjustments in the
7853A17853AN (SN 8209999 and below).
Location of adjustments in the 7853A
(SN 8210000 and up).
8-25
Location of adjustments in the
7853A17853AN.
Partial A6-Sweep circuit board
component locator (SN 8090000 and up).
LIST OF TABLES
Table
No.
1-1
1-2
1-3
2-1
2-2
4-1
4-2
4-3
4-4
4-5
5-1
Page
Electrical ....................... 1-1
Environmental ................... 1-6
Physical ....................... 1-6
Deflection Factor of the X Signal ...... 2-13
Risetime Measurements
............ 2-16
Test
Equipment . . . . . . . . . . . . . . . . .. 4-3
Main Sweep
Timing ............... 4-13
Delayed Sweep
Timing ............. 4-14
Main Sweep
Magnifier Accuracy ...... 4-15
Delayed Sweep
Magnifier Accuracy .... 4-15
Relative
Susceptibility to Static Discharge
Damage ........................ 5-2
@ JUN 1980

OPERATORS SAFETY SUMMARY
The general safety information in this part of the summary is for both operating and servicing personnel. Specific
warnings and cautions will be found throughout the manual where they apply, but may not appear in this summary.
TERMS
IN THIS MANUAL
CAUTION statements identify conditions or practices that could result in damage to the equipment or other property.
WARNING statements identify conditions or practices that could result in personal injury or loss of life.
AS MARKED ON EQUIPMENT
CAUTION indicates a personal injury hazard not immediately accessible as one reads the marking, or a hazard to
property including the equipment itself.
DANGER indicates a personal injury hazard immediately accessible as one reads the marking.
SYMBOLS
IN THIS MANUAL
Static-Sensitive Devices.
This symbol indicates where applicable cautionary or other information is to be found.
AS MARKED ON EQUIPMENT
~ DANGER-High voltage.
ffi_
'-:::=:) Protective ground (earth) terminal.
& ATTENTION-refer to manual.
WARNINGS
POWER SOURCE
This product is intended to operate in a mainframe connected to a power source that will not apply more than 250 volts
rms between the supply conductors or between either supply conductor and ground. A protective ground connection by
way of the grounding conductor in the mainframe power cord is essential for safe operation.
GROUNDING THE PRODUCT
This product is grounded through the grounding conductor of the mainframe power cord. To avoid electrical shock, plug
the mainframe power cord into a properly wired receptacle before connecting to the product input or output terminals. A
protective ground connection by way of the grounding conductor in the mainframe power cord is essential for safe
operation.
REV JAN 1985 v

7B53A17B53AN
DANGER ARISING FROM LOSS OF GROUND
Upon loss of the protective-ground connection, all accessible conductive parts (including knobs and controls that may
appear to be insulating), can render an electric shock.
DO NOT OPERATE IN EXPLOSIVE ATMOSPHERES
To avoid explosion, do not operate this product in an atmosphere of explosive gases unless it has been specifically
certified for such operation.
DO NOT OPERATE PLUG-IN UNIT WITHOUT COVERS
To avoid personal injury, do not operate this product without covers or panels installed. Do not apply power to the plug-in
unit via a plug-in extender.
vi
@ JUN 1980

7B53A17B53AN
SERVICING SAFETY SUMMARY
FOR QUALIFIED SERVICE PERSONNEL ONLY
Refer also to the preceding Operators Safety Summary
DO NOT SERVICE ALONE
Do not perform internal service or adjustment of this product unless another person capable of rendering first aid and
resuscitation is present.
USE CARE WHEN SERVICING WITH POWER ON
Dangerous voltages exist at several points in this product. To avoid personal injury. do not touch exposed connections
and components while power is on.
Disconnect power before removing protective panels. soldering. or replacing components.
POWER SOURCE
This product is intended to operate in a mainframe connected to a power source that will not apply more than 250 volts
rms between the supply conductors or between either supply conductor and ground. A protective ground connection by
way of the grounding conductor in the mainframe power cord is essential for safe operation.
@ JUN 1980 vii

7B53A/7B53AN
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II ~ II
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iii
IJ
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.. -•
II iii
• -.
..
..
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1342 · 01
The 7B53 A/ 7B53AN Duat Tlm e Base.
viii
@ JUN 1980