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PLEASE CHECK Fi3R CHANGE fNFOT"IMA"I"ION
AT THE REAR OF THlS MANUAL,
"P853AI7B53AN
DUAL TIME BASE
INSTRUCTION MANUAL
Tektranlx, tnc.
F- . Box 50Q
'0
Beavertan, Oregon 970n
070-1342-02 First Printing SEP 1980
Product Group 42 Revised MAY f 988
7B53A
Copyright "41972, 1980 Tektronix, fne. All rights reserved.
Contents of this publication may not be reproduced in any
form without the written permission of Tektronix, Inc.
Products of Tektrcmix, tnc. and its subsidiaries are cgvered
by US,and foreign patents and/or pending patents.
TEKTRONiX, TEK, SCOPE-MOBILE, and
registered trademarks of Tekrronix. Inc IELE%MLNI
is a registered trademark of Tektronix U.K. Limited,
Printed in t1.5,A. Spcification and price change priviteges
are resewed.
INSTRUMENT SERIAL NUMBERS
Each instrument has a serial number on a panel inseft, tag,
or starnm on the chassis, The first numwr or letter
designates the country ofmanufacture. "i"hs last five digits
of the, serial nurnbr are assigned sequentially and are
unique to each instrument. Those manufaciur& in the
United States have six unique digits. Tha country of
manufacture is identified as follows:
BOOQOOO Tektronix, Inc., Beave~on, Orwon, USA
100000 Tektronix Guernsey, Ltd,, Channel isrands
ZOOOOQ "Taktronix Unit& Kingdom, ttd., Landon
300000 Sonynektronix, Japan
7OOQOQ Tektranix Holland, NV, Heerenvwn,
The Netherlands
7B53A
TABLE OF CONTENTS
Page Page
LIST OF ILLUSTRATIONS .................... iii Section 3 'THEORY OF OPERATION
(cont'd)
LIST OF SABLES ........................... iv
Delayed Trigger Generator
OPERATORS SAFETY SUMMARY ............. (SN 8209999 & Below) . . . . . . . . . . . . .
SERVICE SAFETY SUMMARY ................. vii Delayed Sweep Generator . . . . . . . . .
Horizontal Preamp . . . . . . . . . . . . . . . . . 3-17
Section 1 SPECIFICATION . . . . . . . . . . . . . . . . . .
Readout Switching . . . . . . . . . . . . . . . . 3-18
Section 2 OPERATING INSTRUCTIONS. . . . . . . . 2-1
Section 4 CALIBRATION . . . . . . . . . . . . . . . . . . . .
Controls and Connectors . . . . . . . . . . . 2-1
Test Equipment Required . . . . . . . . . . .
Operating Checkout . . . . . . . . . . . . . . . 2-3
PART 1 PERFORMANCE CHECK . . . .
General Operating Instructions . . . . . . . 2-6
Trigger System Check . . . . . . . . . . . . . .
Applications . . . . . . . . . . . . . . . . . . . . . . 2-13
Horizontal System Check . . . . . . . . . . .
Repackaging for Shipment . . . . . . . . . . 2-20
PART 2 ADJUSTMENT . . . . . . . . . . . .
Trigger System Adjustment . . . . . . . . . . 4-21
Horizontal System Adjustment . . . . . . . 4-24
7Be remaining portion of this Table of Contents lists the
Section 5 MAINTENANCE . . . . . . . . . . . . . . . . . . 5-1
servicing instructions. These servicing instructions are for
use by qualified personnel only. To avoid electrical shock. Preventive Maintenance . . . . . . . . . . . . 5-1
do not perform any sewicing other than that called out in the Troubleshooting . . . . . . . . . . . . . . . . . . . 5-2
operating instructions unless qualified to do so. Corrective Maintenance . . . . . . . . . . . . 5-4
Section 3 THEORY OF OPERATION... . . . . . . . . . . 3-1 Section 6 OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Simplified Block Diagram . . . . . . . . . . . . 3-1
Circuit Operation . . . . . . . . . . . . . . . . . . 3-3
Main Trigger Preamp . . . . . . . . . . . . . . . 3-4 Section 7 REPLACEABLE ELECTRICAL PARTS
Main Trigger Generator (SN B210000
& Up 7B53A Only) . . . . . . . . . . . . . . . . . 3-4
Main Trigger Generator (SN 8209999 Section 8 DIAGRAMS AND CIRCUIT BOARD
& Below) . . . . . . . . . . . . . . . . . . . . . . . . .
3-7 DESCRIPTIONS
Main Sweep Generator . . . . . . . . . . . . . 3-9
Delayed Trigger Generator
Section 9 REPLACEABLE MECHANICAL PARTS
(SN B210000 & Up 7B53A Only) . . . . . 3-12
REV DEC 1982
7B53A
Fig. Fig.
No. Page No. Page
7B53N7B53AN Dual Time Base . . . . . . . .viii 4-2 Typical delay time error measurement. .. 4-16
Location of release latch. . . . . . . . . . . . 2-1 4-3 Typical Delay Time Error Figures. ..... 4-17
Front-panel controls and connectors. ... 2-2 4-4 Allowable Delay Time Error. ......... 4-17
Frequency range of each COUPLING 4-5 Typical CRT display when checking sweep
switch position. . . . . . . . . . . . . . . . . . . 2-7 length.. . . . . . . . . . . . . . . . . . . . . . . . . 4-25
Effect of LEVEL control and SLOPE switch 4-6 Typical CRTdisplayfor adjustment of DIy'd
on CRT display. . . . . . . . . . . . . . . . . . . 2-9 Sweep Start and Dly'd Sweep Stop. . . . . 4-26
Composite T'ime/Division switch. ...... 2-10 5-1 Location of pins on interface connector. . 5-3
Area of graticule used for accurate time 5-2 Cam Switch Removal. .............. 5-7
measurements. . . . . . . . . . . . . . . . . . . . 2-1 1
Operation of Sweep Magnifier. ....... 2-71 The illustrations in Section 8 are located near their
associated diagrams on the foldout page.
(A) Intensified Sweep display; (B) Delayed
Sweep display. . . . . . . . . . . . . . . . . . . . 2-12 8-1 Electrode configuration for
Typical Mixed Sweepdisplay (DELAY TIME semiconductors in the instrument.
MULT dial set to 3.55). . . . . . . . . . . . . . 2-12 8-2 Location of circuit boards in the
DELAY "TIME MULT dial. Reading shown 7B53A/7B54AN.
3.55. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 8-3 Partial Al--.Interface circuit board
component locator (SN B090000 and up).
Measuring the time duration between
8-4 Partial Al--Interface circuit board
points on a waveform. . . . . . . . . . . . . . . 2-15
component locator (SN 8089999 and
Measuring risetime. ............... 2-16 below).
Measuring time difference using delayed 8-5 A2-Source Switch circuit board
sweep. . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 component locator.
Using delayed sweep for magnification. . 2-18 8-6 A3-.-Coupling Switch circuit board
Displaying a complex signal using delayed component locator.
sweep. . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 8-7 Partial A4----Triggercircuit board
Measuring pulse jitter. ............. 2-20 component locator 7B53A only
(SN B210000 and up).
7B53A/7B53AN Simplified Block Diagram. 3-2
8-8 Partial A4-Trigger circuit board
Trigger Preamp and Input Switching Block component locator (SN 8209999 and
Diagram. . . . . . . . . . . . . . . . . . . . . . . . 3-5 below).
Main Trigger Generator Block Diagram 8-9 Partial A6-.-Sweep circuit board
(SN B210000 and up 7B53A only). . . . . . 3-6 component locator (SN B090000 and up).
Main Trigger Generator Block Diagram 8-10 Partial A6---Sweep circuit board
(SN B209999 and below). . . . . . . . . . . . 3-8 component locator (SN 8089999 and
Main Sweep Generator Block Diagram. . 3-10 below).
Delayed Trigger Generator Block Diagram 8-1 1 AS-Mode Switch circuit board.
(SN B210000 and up 7B53A only). . . . . . 3-13 8-12 Partial A4.--Trigger circuit board
component locator 7B53A only
Delayed Trigger Generator Block Diagram
(SN B210000 and up).
(SN B209999and below). . . . . . . . . . . . 3-14
8-13 A7--Delayed Trigger Switch circuit board
Delayed Sweep Generator Block Diagram. 3-15 component locator.
Horizontal Preamp Block Diagram. .... 3-17 8-14 Partial A4---Trigger circuit board
Location of Delayed Gate Out and Variable component locator (SN 8209999 and
Selector multi-pin connectors. . . . . . . . . 4-2 below).
@? JUN 1980
7B53A
Fig. Fig.
No. No.
Partial A6--Sweep circuit board 8-21 Partial A6---Sweep circuit board
component locator (SN 8090000 and up). component locator (SN 8089999 and
Partial A6-Sweep circuit board below).
component locator (SN 3089999 and 8-22 Partial AG.--Sweep circuit board
below). component locator (SN 8090000 and up).
Partial Al--Interface circuit board (7653A 8-23 Location of adjustments in the
on1y) component locator. 7653A/7853AN (SN 6209999 and below).
Partial A1 --Interface circuit board 8-24 Location of adjustments in the 7853A
(7653AN only) component locator. (SN 8210000 and up).
A8---Readout circuit board (7853A only) 8-25 Location of adjustments in the
component locator. 7853A/7 B53AN.
Partial A6--Sweep circuit board
component locator (SN 8090000 and up).
LIST OF TABLES
Table
No. 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 t o Static Discharge
Damage . . . . . . . . . . . . . . . . . . . . . . . . 5-2
@? JUN 1980
7B53A
OPERATORS SAFETY SUMMARY
The general safety information i n this part of the summary is for both operating and servicing personnel. Specific
warnlngs and cautions will be found throughout the manual where they apply, but may not appear in this summary.
I N THlS MANUAL
CAUTION statements identify conditions or practices that could result i n damage to the equipment or other property.
WARNING statements identify conditions or practices that could result i n personal injury or loss of life
AS MARKED O N 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
I N THlS MANUAL
@ Static-Sensitive Devices.
This symbol indicates where applicable cautionary or other information is to be found
AS MARKED O N EQUIPMENT
D A N G E R - H ~ g hvoltage.
@ Protective ground (earth) terminal.
A ATTENTION----refer to manual.
WARNINGS
POWER SOURCE
This product is intended t o operate i n a mainframe connected t o a power source that w i l l 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 g r o u n d ~ n gconductor i n the mainframe power cord is essential for safe operation.
GROUNDING THE PRODUCT
'This product is grounded throirgh the grounding conductor of the mainframe power cord. To avoid electrical shock, plug
the mainframe power cord into a properly w ~ r e d
receptacle before connecting to the product input or output t e r m ~ n a l sA
.
protective ground connection by way of the grounding conductor in the mainframe power cord is essential for safe
operation.
REV JAN 1985
7B53A
DANGER ARISING FROM LOSS OF GROUND
Upon loss of the protectwe-ground connection, all access~biecondijctrve parts (~ncludrng
knobs and controls that may
appear to be rnsulat~ng),can render an e l e c t r ~ cshock
D O NOT OPERATE I N EXPLOSIVE ATMOSPHERES
To avoid explosion, d o not operate this product i n a n atmosphere of explosive gases unless it has been specifically
certified for such operation.
D O 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 p l u g - ~ n
unlt via a plug-in extender.
@ JUN 1980
7B53A
SERVICING SAFETY SUMMARY
FOR QUALIFIED SERVICE PERSONNEL ONLY
Refer also to the preceding Operators Safety Summary
D O 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 O N
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 removlng protective panels, soldering, or replacing components.
POWER SOURCE
This product is intended to operate in a mainframe connected to a power source that w i l l 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 i n the mainframe power cord is essential for safe operation.
@ JUN 1980
7B53A
7B53A
Section 1-.--7B53A/7B53AN
The 7B53A and 7B53AN are electrically identical except that only the 785314 is compatible with the
alphanumeric readout system provided for the 7000-series oscilloscopes.
This instrument will meet the electrical characteristics listed under Performance Requirement i n Table 1-1, following
complete calibration. The following electrical characteristics apply over an ambient temperature range of 0