Tektronix 7B92A User manual

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ARMY TM 11-6625-2925-24
AIR FORCE TO 33A1-10-242-2
ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT
MAINTENANCE MANUAL
DUAL TIME BASE, TEKTRONIX MODEL 7B92A
(NSN 6625-01-027-0265)
DEPARTMENTS OF THE ARMY AND THE AIR FORCE 21 JULY 1980

WARNING
DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT
Dangerous potentials exist at several points throughout this equipment. When the equipment is operated
with the covers removed DO NOT touch exposed connections or components. Some transistors have
voltages present on their cases. Disconnect power before cleaning the equipment or replacing parts.
DON’T TAKE CHANCES!

Copyright 1974 (new material 1978) by Tektronix Inc.
REPRODUCED BY PERMISSION OF THE COPYRIGHT OWNER, TEKTRONIX INC.
TM 11-6625-2925-24
TO 33A1-10-242-2
Technical Manual ) DEPARTMENTS OF THE ARMY
No. 11-6625-2925-24 ) AND THE AIR FORCE
TO 33A1-10-242-2 ) Washington, DC, 21 July 1980
ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT
MAINTENANCE MANUAL
DUAL TIME BASE, TEKTRONIX MODEL 7B92A
(NSN 6625-01-027-0265)
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS
You can help improve this manual. If you find any mistakes or if you know of a way to improve the
procedures, please let us know. Mail your letter or DA Form 2028 (Recommended Changes to
Publications and Blank Forms) direct to: Commander, US Army Communications and Electronics
Materiel Readiness Command and Fort Monmouth, ATTN: DRSEL-ME-MQ, Fort Monmouth, New Jersey
07703.
For Air Force, submit AFTO Form 22 (Technical Order System Publication Improvement Report and
Reply) in accordance with paragraph 6-5, Section VI, T.O. 00-5-1. Forward direct to prime ALC/MST.
In either case, a reply will be furnished direct to you.
TABLE OF CONTENTS
Page
SECTION 0 INTRODUCTION
Scope............................................................................................................................................ 0-1
Indexes of Publications ................................................................................................................. 0-1
Maintenance Forms, Records, and Reports ................................................................................. 0-1
Reporting Equipment Improvement
Recommendations (EIR)............................................................................................................ 0-1
Destruction of Army Electronics Materiel ...................................................................................... 0-1
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7B92A
TABLE OF CONTENTS
Page
LIST OF ILLUSTRATIONS........................................................................................................... v
SAFETY SUMMARY..................................................................................................................... vii
SECTION 1 OPERATING INSTRUCTIONS
INTRODUCTION........................................................................................................................... 1-1
INSTALLATION............................................................................................................................. 1-1
FRONT-PANEL CONTROLS, CONNECTORS, AND INDICATORS ........................................... 1-2
Main Triggering Controls............................................................................................................ 1-2
Sweep Controls.......................................................................................................................... 1-4
Delayed Triggering Controls ...................................................................................................... 1-5
Front-Panel Inputs...................................................................................................................... 1-5
FUNCTIONAL CHECK.................................................................................................................. 1-5
Setup Procedure........................................................................................................................ 1-6
Sweep Functions........................................................................................................................ 1-6
Triggering Functions .................................................................................................................. 1-7
GENERAL OPERATING INFORMATION..................................................................................... 1-8
Main Triggering.......................................................................................................................... 1-8
Main Trigger Modes................................................................................................................... 1-8
Main Trigger Coupling................................................................................................................ 1-9
Main Trigger Source................................................................................................................... 1-10
Input Impedance ........................................................................................................................ 1-10
Trigger Slope.............................................................................................................................. 1-10
Trigger Level.............................................................................................................................. 1-10
Selecting Sweep Rates.............................................................................................................. 1-12
Time Measurement.................................................................................................................... 1-12
Display Modes............................................................................................................................ 1-12
Delay Time Multiplier.................................................................................................................. 1-13
Delayed Sweep Triggering......................................................................................................... 1-13
SECTION 2 SPECIFICATION........................................................................................................................... 2-1
THE FOLLOWING SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY.
TO AVOID PERSONAL INJURY, DO NOT PERFORM ANY SERVICING OTHER THAN THAT
CONTAINED IN OPERATING INSTRUCTIONS UNLESS YOU ARE
QUALIFIED TO DO SO.
SECTION 3 THEORY OF OPERATION
Block Diagram Description............................................................................................................ 3-1
Detailed Circuit Description........................................................................................................... 3-1
Main Trigger Generator............................................................................................................ 3-1
Delaying Sweep Generator...................................................................................................... 3-3
Delayed Trigger Generator.......................................................................................................3-4
Delayed Sweep Generator....................................................................................................... 3-6
Horizontal Logic........................................................................................................................ 3-6
Output Amplifier........................................................................................................................ 3-7
Readout.................................................................................................................................... 3-7
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7B92A
TABLE OF CONTENTS (cont)
SECTION 4 MAINTENANCE............................................................................................................................ Page
Preventive Maintenance................................................................................................................ 4-1
Cleaning ................................................................................................................................... 4-1
Visual Inspection ...................................................................................................................... 4-1
Lubrication................................................................................................................................ 4-1
Semiconductor Checks ............................................................................................................ 4-2
Adjustment After Repair........................................................................................................... 4-2
Troubleshooting............................................................................................................................. 4-3
Troubleshooting Aids................................................................................................................ 4-3
Troubleshooting Equipment ..................................................................................................... 4-6
Troubleshooting Techniques.................................................................................................... 4-6
Corrective Maintenance ................................................................................................................ 4-8
Obtaining Replacement Parts .................................................................................................. 4-8
Soldering Techniques............................................................................................................... 4-8
Component Removal and Replacement .................................................................................. 4-9
Adjustment After Repair........................................................................................................... 4-11
Repackaging For Shipment...................................................................................................... 4-11
SECTION 5 PERFORMANCE CHECK/CALIBRATION
Preliminary Information ............................................................................................................ 5-1
Test Equipment Required......................................................................................................... 5-1
Part I Performance Check............................................................................................................. 5-4
Outline for Part I Performance Check ...................................................................................... 5-4
A. Trigger Sensitivity........................................................................................................... 5-4
B. Horizontal System.......................................................................................................... 5-4
Preliminary Procedure.............................................................................................................. 5-4
A. Trigger Sensitivity................................................................................................................ 5-5
B. Horizontal System............................................................................................................... 5-10
Part II Calibration........................................................................................................................... 5-16
Outline for Part II Calibration.................................................................................................... 5-16
A. Trigger Sensitivity (SN B070000-above)........................................................................ 5-16
B. Trigger Sensitivity (SN B069999-below)........................................................................ 5-16
C. Horizontal System.......................................................................................................... 5-17
Preliminary Procedure......................................................................................................... 5-17
A. Trigger Sensitivity (SN B070000-above)............................................................................. 5-18
B. Trigger Sensitivity (SN B069999-below)............................................................................. 5-25
C. Horizontal System............................................................................................................... 5-33
SECTION 6 OPTIONS
SECTION 7 REPLACEABLE ELECTRICAL PARTS
SECTION 8 DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS
SECTION 9 REPLACEABLE MECHANICAL PARTS
Change Information
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iii

TM 11-6625-2925-24/TO 33A1-10-242-2
TABLE OF CONTENTS (CONT)
Page
APPENDIX A REFERENCES................................................................................................................. A-1
APPENDIX B MAINTENANCE ALLOCATION
Section I. Introduction....................................................................................................................... B-1
II. Maintenance Allocation Chart for Dual Time
Base, Tektronix Model 7B92A..................................................................................... B-3
III. Tool and Test Equipment Requirements for Dual
Time Base, Tektronix Model 7B92A............................................................................ B-4
IV. Remarks........................................................................................................................... B-5
APPENDIX C REPAIR PARTS AND SPECIAL TOOLS LIST (RPSTL)
(Not applicable)
APPENDIX D EXPENDABLE SUPPLIES AND MATERIALS LIST
(Not applicable)
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7B92A
LIST OF ILLUSTRATIONS
Figure No. Page
Frontispiece 7B92A Dual Time Base
1-1 Location of Variable and Mainframe Selector multi-pin connectors ....................................... 1-1
1-2 Location of release latch......................................................................................................... 1-2
1-3 Front-panel controls and connectors...................................................................................... 1-3
1-4 Effect of MAIN TRIGGERING LEVEL and SLOPE controls on crt display............................. 1-11
1-5 Area of graticule used for most accurate time measurements ............................................... 1-12
1-6 Typical alternate sweep display.............................................................................................. 1-13
2-1 Dimensional drawing............................................................................................................... 2-5
4-1 Lubrication procedure for a typical cam switch....................................................................... 4-2
4-2 Semiconductor lead configurations......................................................................................... 4-4
4-3 Inter-board multi-pin connector assembly............................................................................... 4-5
4-4 End-lead multi-pin connector assembly.................................................................................. 4-5
4-5 Location of pin numbers of Interface connector ..................................................................... 4-5
5-1 Main Triggering level range.................................................................................................... 5-6
5-2 Delayed Triggering level range............................................................................................... 5-6
5-3 Variable Time/Division range.................................................................................................. 5-13
5-4 Fast delay time accuracy........................................................................................................ 5-14
5-5 DC balance. (Circle denotes correct trigger point.)................................................................ 5-19
5-6 Trigger Sensitivity. (Circle denotes correct trigger point.)...................................................... 5-19
5-7 Main Triggering level range. (Circle denotes triggering limits.).............................................. 5-19
5-8 Delayed Triggering level range. (Circle denotes triggering limits.)........................................ 5-21
5-9 DC balance. (Circle denotes correct trigger point.)................................................................ 5-26
5-10 Trigger sensitivity. (Circle denotes correct trigger point.) ...................................................... 5-26
5-11 Main Triggering level range. (Circle denotes triggering limits.).............................................. 5-27
5-12 Delayed Triggering level range. (Circle denotes triggering limits.)........................................ 5-29
5-13 Correct DTM Scale and Delay Start adjustment (circle)......................................................... 5-34
5-14 Variable Time/Division range.................................................................................................. 5-38
5-15 Fast delay time accuracy........................................................................................................ 5-39
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7B92A
LIST OF ILLUSTRATIONS (cont)
The illustrations in Section 8 are located near their associated
diagrams on the foldout pages.
Figure No.
8-1 Circuit board locations
8-2 Block diagram
8-3 A3 Coupling Switch circuit board
8-4 A5 Delayed Triggering Switch circuit board
8-5 A2 Source Switch circuit board
8-6 A4 Mode Switch circuit board
8-7 Al External Input circuit board
8-8 A8 Main Trigger circuit board (SN B070000-above)
8-9 A8 Main Trigger circuit board (SN B069999-below)
8-10 A9 Delayed Trigger circuit board (SN B070000-above)
8-11 A9 Delayed Trigger circuit board (SN B069999-below)
8-12 A6 Interface circuit board
8-13 A6 Interface circuit board
8-14 A6 Interface circuit board
8-15 A7 Logic circuit board (SN B059999-below)
8-16 A7 Logic circuit board (SN B060000-above)
8-17 A12 Readout circuit board
8-18 Location of Sweep Timing adjustments
8-19 Location of Main Trigger adjustments (SN B069999-below)
8-20 Location of Delayed Trigger adjustments (SN B069999-below)
8-21 Location of Main Trigger adjustments (SN B070000-above)
8-22 Location of Delayed Trigger adjustments (SN B070000-above)
LIST OF TABLES
Table No. Page No.
2-1 Electrical Characteristics..........................................................................................................................2-1
2-2 Environmental...........................................................................................................................................2-4
2-3 Physical.....................................................................................................................................................2-4
3-1 7B92A Readout Character Selection........................................................................................................3-8
5-1 Test Equipment.........................................................................................................................................5-2
5-2 Sweep Timing...........................................................................................................................................5-11
5-3 Fast Timing...............................................................................................................................................5-12
5-4 Fast Sweep Linearity.................................................................................................................................5-12
5-5 Differential Delay Time Accuracy..............................................................................................................5-13
5-6 Fast Differential Delay Time Accuracy......................................................................................................5-14
5-7 Sweep Timing...........................................................................................................................................5-36
5-8 Fast Timing...............................................................................................................................................5-37
5-9 Fast Sweep Linearity.................................................................................................................................5-37
5-10 Differential Delay Time Accuracy..............................................................................................................5-39
5-11 Fast Differential Delay Time Accuracy......................................................................................................5-39
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vi

7B92A
SAFETY SUMMARY
This manual contains safety information that the user must follow to ensure safe operation of this instrument.
WARNING information is intended to protect the operator; CAUTION information is intended to protect the instrument.
The following are general safety precautions that must be observed during all phases of operation and maintenance.
Ground 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 Operate in Explosive Atmosphere
Do not operate this instrument in an area where flammable gases or fumes are present. Such
operation could cause an explosion.
Avoid Live Circuits
Electrical-shock hazards are present in this instrument. The protective instrument covers must
not be removed by operating personnel. Component replacement and internal adjustments must
be referred to qualified service personnel.
Do Not Service or Adjust Alone
Do not service or make internal adjustments to this instrument unless another person, capable of
giving first aid and resuscitation, is present.
Warning Statements
Warning statements accompany potentially dangerous procedures in this manual. The following
warnings appear in this manual and are listed here for additional emphasis.
To avoid electrical shock, disconnect the instrument from the power source before soldering.
To avoid electrical shock, disconnect the instrument from the power source before replacing
components.
Handle silicone grease with care. Avoid getting silicone grease in eyes. Wash hands thoroughly
after use.
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