Service Manuals, User Guides, Schematic Diagrams or docs for : Tektronix 7b15_sm
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COMMI1`T"ED TO EXCELLENCE
K CHANGE INFORMATION
2 OF THIS MANUAL.
IN N MANUAL
Tektronix, Inc.
P.O . Box 500
Beaverton, Oregon 97077 Serial Number ___
070-2318-00 First Printing OCT 1978
Product Group 42 Revised APR 1984
Copyright '~) 1978 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 . TEL-EQUIPMENT
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 parcel 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 :
8000000 Tektronix, Inc., Beaverton, Oregon, USA
100000 Tektronix Guernsey, Ltd ., Channel Islands
200000 Tektronix United Kingdom, Ltd ., London
300000 Sony/Tektronix, Japan
700000 Tektronix Holland, NV, Heerenveen,
The Netherlands
7B15
PAGE PAGE
LIST OF ILLUSTRATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii SECTION 3 THEORY OF OPERATION
LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv BLOCK DIAGRAM DESCRIPTION . . . . . . . . . . . . . . . . . . . . . 3-1
OPERATORS SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . .v TRIGGER GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
SERVICE SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . vi SWEEP GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
PICKOFF COMPARATORS AND
SECTION 1 GENERAL INFORMATION DELAY GATE GENERATOR . . . . . . . . . . . . . . . . . . . . . . . 3-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 LOGIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
OPERATORS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 DIGITAL VOLTMETER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
INSTRUCTION MANUAL . . . . . . . . . . . . . . . . . . . . . . . . 1-1 DETAILED CIRCUIT DESCRIPTION . . . . . . . . . . . . . . . . . . . . 3-3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 LOGIC FUNDAMENTALS . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
INSTRUMENT PACKAGING . . . . . . . . . . . . . . . . . . . . . . . . 1-1 SYMBOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 LOGIC POLARITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
STANDARD ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 INPUT/OUTPUT TABLES . . . . . . . . . . . . . . . . . . . . . . . 3-3
NON-DIGITAL DEVICES . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
SECTION 2 OPERATING INSTRUCTIONS FRONT-PANEL. WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
CONTROLS, CONNECTORS AND INDICATORS . . . . . 2-1 TRIGGER GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
OPERATORS CHECKOUT . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 EXTERNAL TRIGGER AMPLIFIER . . . . . . . . . . . . . . . 3-3
SETUP PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 TRIGGER AMPLIFIER AND
SWEEP FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 SOURCE SELECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
TRIGGERING FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . 2-4 SLOPE SELECTOR AND
DETAILED OPERATING INFORMATION . . . . . . . . . . . . 2-5 TRIGGER GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
TRIGGERING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 GATE GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
TRIGGER COUPLING . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 LOGIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
TRIGGER SOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 TRIGGER MODE SWITCHING . . . . . . . . . . . . . . . . . . 3-7
TRIGGER SLOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 HOLD OFF TIMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
TRIGGER LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 LOCKOUT BUFFER AMPLIFIER . . . . . . . . . . . . . . . . . 3-9
HORIZONTAL SWEEP RATES . . . . . . . . . . . . . . . . . . 2-8 HOLD OFF GENERATOR . . . . . . . . . . . . . . . . . . . . . . . 3-9
TIME MEASUREMENTS . . . . . . . . . . . . . . . . . . . . . . . . 2-8 DELAY MODE CONTROL . . . . . . . . . . . . . . . . . . . . . . 3-9
SWEEP MAGNIFICATION . . . . . . . . . . . . . . . . . . . . . . . 2-8 AUXILIARY Y-AXIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
VARIABLE HOLD OFF . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 SWEEP GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
DELAY-TIME OPERATION . . . . . . . . . . . . . . . . . . . . . . 2-8 TIMING CURRENT SOURCE . . . . . . . . . . . . . . . . . . . 3-10
A TIME OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 RAMP GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
MAINFRAME OPERATING MODES . . . . . . . . . . . . -10 OUTPUT PREAMPLIFIER . . . . . . . . . . . . . . . . . . . . . . 3-11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2APLICTONS -10 AUXILIARY SWEEP PREAMPLIFIER . . . . . . . . . . . . 3-11
MEASUREMENTS . . . . . . . . . . . . . . 2DELAY-SWP -10 SWEEP GATE GENERATOR . . . . . . . . . . . . . . . . . . . 3-11
MEASUREMENTS 2TIME-NRVAL PICKOFF COMPARATORS AND DELAY
(DELAY-TIME MODE) . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 GATE GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
DIFFERENTIAL TIME-INTERVAL DELAY PICKOFF COMPARATORS . . . . . . . . . . . . . 3-11
MEASUREMENTS (A TIME MODE) . . . . . . . . . . . . 2-12 DELAY AND 0 TIME REFERENCE
DELAYED-SWEEP MAGNIFICATION . . . . . . . . . . . . 2-14 VOLTAGE SOURCES . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
TRIGGERED DELAYED-SWEEP DELAY GATE GENERATOR . . . . . . . . . . . . . . . . . . . 3-12
MAGNIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16 DIGITAL VOLTMETER . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
INDEPENDENT TIME-INTERVAL DELAY COMPARISON VOLTAGE TO
MEASUREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16 RAMP CONVERTER . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
COMPARATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
REFERENCE CURRENT SOURCE . . . . . . . . . . . . . . . 3-14
REFERENCE CURRENT INVERTER . . . . . . . . . . . . 3-14
THE REMAINING PORTION OF THIS TABLE OF COUNTER AND ENCODER . . . . . . . . . . . . . . . . . . . . 3-14
CONTENTS LISTS THE SERVICING INSTRUCTIONS . TIME/DIVISION AND READOUT SWITCHING . . . . . 3-14
THESE SERVICING INSTRUCTIONS ARE FOR USE BASIC READOUT SYSTEM . . . . . . . . . . . . . . . . . . . . 3-14
BY QUALIFIED PERSONNEL ONLY . T O AVOID TIME/DIVISION READOUT . . . . . . . . . . . . . . . . . . . . 3-14
ELECTRICAL SHOCK, DO NOT PERFORM ANY DELAY TIME READOUT . . . . . . . . . . . . . . . . . . . . . . . 3-15
SERVICING OTHER THAN THAT CALLED OUT IN A SYMBOL ENABLE . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
THE OPERATING INSTRUCTIONS UNLESS INTERFACE CONNECTORS AND
QUALIFIED TO DO SO . POWER SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
PAGE PAGE
SECTION 4 MAINTENANCE COMPONENT REMOVAL AND REPLACEMENT . . . . . 4-9
PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 CIRCUIT BOARDS . . . . . . . . . ............... . . . . . 4-9
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 SWITCHES . . . . . . . . . . . . . . . . ............... . . . . 4-10
EXTERIOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 HYPCON CONNECTORS . . . . ............... . . . . 4-12
INTERIOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 INTERCONNECTING PINS . . ............... . . . . 4-13
SWITCH CONTACTS . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 FRONT-PANEL LIGHTS . . . . . ............... . . . . 4-16
VISUAL INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 ADJUSTMENT AFTER REPAIR . ............... . . . . 4-16
LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 INSTRUMENT REPACKAGING . ............... . . . . 4-16
CAM SWITCH LUBRICATION . . . . . . . . . . . . . . . . . . . 4-1
SEMICONDUCTOR CHECKS . . . . . . . . . . . . . . . . . . . . . . . 4-2
SECTION 5 CALIBRATION
ADJUSTMENT AFTER REPAIR . . . . . . . . . . . . . . . . . . . . . 4-2
CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
PRELIMINARY INFORMATION . . . . . . . . . . . . . . . . . . . . . 5-1
TROUBLESHOOTING AIDS . . . . . . . . . . . . . . . . . . . . . . . . 4-3
USING THESE PROCEDURES . . . . . . . . . . . . . . . . . . 5-1
DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
ADJUSTMENT INTERVAL . . . . . . . . . . . . . . . . . . . . . . 5-2
TROUBLESHOOTING CHART . . . . . . . . . . . . . . . . . . . 4-3 TEKTRONIX FIELD SERVICE . . . . . . . . . . . . . . . . . . . . 5-2
VOLTAGES AND WAVEFORMS . . . . . . . . . . . . . . . . 4-3
TEST EQUIPMENT REQUIRED . . . . . . . . . . . . . . . . . . . . . 5-6
CIRCUIT-BOARD ILLUSTRATIONS . . . . . . . . . . . . . . . 4-3
SPECIAL FIXTURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
SWITCH CAM IDENTIFICATION . . . . . . . . . . . . . . . . . 4-3 1- EST EQUIPMENT ALTERNATIVES . . . . . . . . . . . . . 5-6
DIODE COLOR CODE . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 PART I-PERFORMANCE CHECK . . . . . . . . . . . . . . . . . . . . . . 5-8
WIRING COLOR CODE . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 PERFORMANCE CHECK PROCEDURE INDEX . . . . . . 5-8
SEMICONDUCTOR BASING . . . . . . . . . . . . . . . . . . . . 4-3 PERFORMANCE CHECK POWER-UP
INTER-BOARD PIN CONNECTOR SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 A . TRIGGERING SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
MULTI-PIN CONNECTOR IDENTIFICATION . . . . . . . 4-3 B . HORIZONTAL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
INTERFACE CONNECTOR PIN LOCATIONS . . . . . . 4-3 PART II-ADJUSTMENT AND PERFORMANCE
ADJUSTMENT AND PERFORMANCE CHECK . . . . . . . 4-3 CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23
TROUBLESHOOTING EQUIPMENT . . . . . . . . . . . . . . 4-5 ADJUSTMENT AND PERFORMANCE
TROUBLESHOOTING TECHNIQUES . . . . . . . . . . . . . . . . 4-6 CHECK INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23
1 . CHECK CONTROL SETTINGS . . . . . . . . . . . . . . . . 4-6 ADJUSTMENT AND PERFORMANCE CHECK
2 . CHECK ASSOCIATED EQUIPMENT . . . . . . . . . . 4-6 POWER-UP SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23
3 . VISUAL CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 A . TRIGGERING SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24
4. CHECK INSTRUMENT ADJUSTMENT . . . . . . . . 4-6 B . HORIZONTAL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-29
5 . ISOLATE TROUBLE TO A CIRCUIT . . . . . . . . . . 4-6
6 . CHECK VOLTAGES AND WAVEFORMS . . . . . . 4-6 SECTION 6 INSTRUMENT OPTIONS
7 . CHECK INDIVIDUAL COMPONENTS . . . . . . . . . 4-6
TRANSISTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
INTEGRATED CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . 4-7 SECTION 7 REPLACEABLE ELECTRICAL PARTS
DIODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
RESISTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7 SECTION 8 DIAGRAMS AND CIRCUIT BOARD
INDUCTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7 ILLUSTRATIONS
CAPACITORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
8 . REPAIR AND ADJUSTMENT . . . . . . . . . . . . . . . . . 4-7
SECTION 9 REPLACEABLE MECHANICAL PARTS
CORRECTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
OBTAINING REPLACEMENT' PARTS . . . . . . . . . . . . . . . 4-8 CHANGE INFORMATION
SOLDERING TECHNIQUES . . . . . . . . . . . . . . . . . . . . . . . . 4-8
71115
FIGURE FIGURE
NO . PAGE NO . PAGE
Frontis-
piece 7815 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii Basic block diagram of the 7815 Delaying
1-1 Location of release latch . . . . . . . . . . . . . . . . . . . . . . 1-1 Time Base unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ., 3-2
1-2 71315 dimensional drawing . . . . . . . . . . . . . . . . . . . . 1-5 3-2 Timing diagram for Gate Generator stages
Front-panel controls, connectors, Q160, Q164, and Q174 . . . . . . . . . . . . . . . . . . . . . . . 3-8
3-3 Timing diagram for Delay Pickoff
and indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Inhibit stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
2-2 Effects of LEVEL control and SLOPE
3-4 Digital Voltmeter timing diagram . . . . . . . . . . . . . . 3-13
switch on crt display . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2-3 Area of graticule used for most accurate 4-1 Lubrication procedure for a typical cam switch 4-2
time measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 4-2 Semiconductor lead configuration . . . . . . . . . . . . . . 4-4
2-4 Effect of sweep magnifier on crt display . . . . . . . 2-9 4-3 Inter-board multi-pin connector assembly . . . . . . . 4-5
2-5 (A) Delaying-sweep display produced by 7815 4-4 End-lead multi-pin connector assembly . . . . . . . . . 4-5
in the A horizontal compartment . (B) Delayed- 4-5 Location of pin numbers on Interface connector 4-5
sweep display produced bycompanion 4-6 P38 cable dress illustration . . . . . . . . . . . . . . . . . . . 4-10
time-base unit in the B horizontal 4-7 Readout board removal procedure . . . . . . . . . . . . . 4-11
compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 4-8 Coaxial end-lead connector assembly . . . . . . . . . 4-12
2-6 Typical A (Differential Time Operation . . . . . . . . 2-11 4-9 Cam switch removal procedure . . . . . . . . . . . . . . . 4-14
2-7 Measuring time intervals from a triggering 4-10 Removal procedure for typical push-
event (start of sweep) to any point on button switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
4-11 Hypcon connector removal and replacement . . . 4-18
2-8 Measuring risetime, fall time, period, 4-12 Exploded view of circuit-board pin
frequency, or pulse width in the L (differential) and ferrule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
time mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 4-13 Front-panel light socket assembly . . . . . . . . . . . . . 4-20
2-9 Magnifying a selected segment of the delaying
(A) sweep in the delay-time mode with 8-1 Semiconductor lead configuration .
mainframe alternate or chopped horizontal 8-2 Location of circuit boards in the 7815 .
operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14 8-3 A1-Interface circuit board assembly .
2-10 Time-interval measurements in the delay-time 8-4 A2-Trigger circuit board assembly.
and A (differential) time mode with mainframe 8-5 A3-Readout circuit board assembly .
alternate or chopped operation . . . . . . . . . . . . . . . 2-15 8-6 A4-Digital Voltmeter circuit board assembly .
2-11 Examining an event that occurs within a 8-7 Location of Sweep Timing adjustments .
selected time interval after a known delay 8-8 Location of Digital Voltmeter adjustments .
time in the delay-time mode . . . . . . . . . . . . . . . . . 2-16 8-9 Location of Triggering adjustments .
REV A MAY 1979
TABLE
NO . PAGE
1-1 Electrical Characteristics . . . . . . . . . . . . . . . . . 1-2
1-2 Environmental Characteristics . . . . . . . . . . . . . 1-5
1-3 Physical Characteristics . . . . . . . . . . . . . . . . . . 1-5
3-1 Basic Logic Reference . . . . . . . . . . . . . . . . . . . 3-4
3-2 Readout Character Selection . . . . . . . . . . . . . . 3-15
5-1 Performance Check Summary . . . . . . . . . . . . . . 5-2
5-2 Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . 5-6
5-3 A Time Accuracy . . . . . . . . . . . . . . . . . . . . . . 5-19
5-4 Sweep Timing . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
5-5 Magnified Sweep Timing . . . . . . . . . . . . . . . . . 5-22
5-6 A Time Accuracy . . . . . . . . . . . . . . . . . . . . . . 5-37
5-7 Sweep Timing . . . . . . . . . . . . . . . . . . . . . . . . . 5-39
5-8 Magnified Sweep Timing . . . . . . . . . . . . . . . . . 5-40
7B15
The following general safety information applies to all operators and service personnel . Specific warnings and cautions
will be found throughout the manual where they apply and should be followed in each instance .
WARNING statements identify conditions or practices which could result in personal injury or loss of life .
CAUTION statements identify conditions or practices which could result in damage to the equipment or other property .
[6+0+A RNING
GROUNDING THE INSTRUMENT
To reduce electrical-shock hazard, the mainframe (oscilloscope) chassis must be properly grounded. Refer to
the mainframe manual for grounding information.
DO NOT REMOVE INSTRUMENT COVERS
To avoid electric-shock hazard, operating personnel must not remove the protective instrument covers.
Component replacement and internal adjustments must be made by qualified service personnel only.
DO NOT OPERATE IN EXPLOSIVE ATMOSPHERE
To avoid explosion, do not operate this instrument in an explosive atmosphere unless it has been certified for
such operation.
PREVENT INSTRUMENT DAMAGE
Plug-in units should not be installed or removed without first turning the instrument power off, to prevent instrument
damage .
7815
VI I . !B I,Vrrr
FOR QUALIFIED SERVICE PERSONNEL ONLY
Refer also to the preceding Operators Safety Summary
The following are safety precautions which appear in the servicing information sections of this manual . This Servicing
Safety Summary is in addition to the Operators Safety Summary given previously.
DO NOT SERVICE ALONE
Do not attempt internal service or adjustment unless another person, capable of rendering first aid and
resuscitation, is present.
DISCONNECT INSTRUMENT POWER
To avoid electric-shock disconnect the instrument from the power source before removing protective panels,
soldering, or replacing components .
SILICONE GREASE HANDLING
Handle silicone grease with care. Avoid getting the silicone grease in your eyes . Wash hands thoroughly after
use.
AVOID EXCESSIVE MOISTURE
Circuit boards and components must be dry before applying power to prevent damage from electrical arcing.
EXERCISE CARE WHEN CHECKING DIODES
When checking diodes, do not use an ohmmeter scale that has a high internal current, since high currents
may damage the diodes under test.
EXERCISE CARE WHEN SOLDERING ON MULTI-LAYER BOARDS
All but the Readout circuit board in the instrument are mufti-layer type boards with a conductive path
laminated between the top and bottom board layers. All soldering on these boards should be done with
extreme care to prevent breaking the connections to this center conductor. Only experienced maintenance
personnel should attempt repair of these boards .
USE PROPER CLEANING AGENTS
Avoid the use of chemical cleaning agents which might damage the plastics used in this instrument . Use a
non-residue type of cleaner, preferably isopropyl alcohol, totally denatured ethyl alcohol, or Freon TF Before
using any other type of cleaner, consult your Tektronix Service Center or representative.
DO NOT USE PIN SOCKETS FOR CONNECTION POINTS
The spring tension of the pin sockets ensures a good connection between the circuit board and the pin. This
spring tension can be destroyed by using the pin sockets as a connecting point for spring-loaded probe tips,
alligator clips, etc.
Vi
7815
2319-1
71315 Features
The 71315 Delaying Time-Base unit provides calibrated sweep rates from .2 seconds to 2 nanoseconds and triggering
to 1 Gigahertz for 7100-, 7700-, 7800-, and 7900-series oscilloscopes. The X10 Magnifier increases each sweep rate by
a factor of 10 and a VARIABLE control allows continuously variable sweep rates between calibrated steps. Variable
hold off and alpha-numeric readouts are provided . Also, when operating in the AUTO TRIGGERING MODE, a bright
baseline trace is displayed in the absence of a trigger signal .
Other features include independent sweep operation of continuously variable sweep delay (DELAY TIME) and
differential sweep delay (A TIME) with a companion time-base unit . Delay time or differential delay time readout is
displayed on the mainframe cathode-ray tube .
Section 1---7815
INTRODUCTION with the front panel of the mainframe. Even though the
gain of the mainframe is standardized, the sweep
OPERATORS MANUAL calibration of the unit should be checked when installed.
The procedure for checking the unit is given under
The Operators Manual contains information necessary to Sweep Functions in the Operators Checkout procedure in
effectively operate the 71315 Time Base and is divided section 2 .
into three sections : Section 1 provides a basic
description of the 71315 with instrument specifications
and accessories; section 2 contains operating To remove the unit, pull the release latch (see Fig. 1-1 ) to
information for the instrument ; instrument option disengage the unit from the mainframe, and pull it out of
information is located in section 3 of the manual . the plug-in compartment.
INSTRUCTION MANUAL
INSTRUMENT PACKAGING
The Instruction Manual provides both operating and If this instrument is to be shipped for long distances by
servicing information for the 71315 Time Base . The commercial means of transportation, it is recommended
Instruction Manual is divided into nine sections .
that it be repackaged in the original manner for
Operating information is covered in the first two sections; maximum protection . The original shipping carton should
servicing information for use by qualified service
be saved and used for this purpose. If more information is
personnel is contained in the remaining seven sections
needed, contact your local Tektronix Field Office or
of the manual . Schematic diagrams are located at the
representative.
rear of the manual and can be unfolded for reference
while reading other parts of the manual . The reference
designators and symbols used on the schematics are
defined on the first page of the Diagrams and Circuit
Board Illustrations section. All abbreviations used in this
manual, with the exception of the parts lists and
schematic diagrams, comply with the American National
Institute Y1 .1-1972 publication . The parts lists are
computer printouts and use computer-supplied
abbreviations . Instrument option information is located in
section 6 of the Instruction Manual .
INSTALLATION
The time-base unit is designed to operate in the
horizontal plug-in compartment of the mainframe. This
instrument can also be installed in a vertical plug-in
compartment to provide a vertical sweep on the crt.
However, when used in this manner, there are no
internal triggering or retrace blanking provisions, and the
unit may not meet specifications .
RELEASE
To install the unit in a plug-in compartment, align the LATCH (196013)2319
upper and lower rails of the plug-in with the mainframe
tracks and push it in until it fits firmly into the
compartment. The front panel of the unit should be flush Figure 1-1 . Location of release latch.
General Information-_-71315
This instrument will meet the electrical characteristics listed in Table 1-1, following complete adjustment . The following
electrical characteristics are valid over the stated environmental range for instruments calibrated at an ambient
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