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TM 11-6625-2750-14&P
TECHNICAL MANUAL
OPERATOR'S, ORGANIZATIONAL, DIRECT SUPPORT
AND GENERAL SUPPORT MAINTENANCE MANUAL
INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
FOR
VERTICAL AMPLIFIER AM-6787(P)/U
(TEKTRONIX MODEL 7Sll SAMPLING UNIT)
(NSN 6625-00-489-6449)
HEADQUARTERS, DEPARTMENT OF THE ARMY
30 JULY 1980
TM 11-6625-2750-14&P
TM 11-6625-2750-14&P
This manual contains copyright material reproduced by permission the Tektronix Company. All rights are reserved.
TECHNICAL MANUAL HEADQUARTERS
No. 11-6625-2750-14&P } DEPARTMENT OF THE ARMY
WASHINGTON, DC, July 30, 1980
OPERATOR'S, ORGANIZATIONAL, DIRECT SUPPORT
AND GENERAL SUPPORT MAINTENANCE MANUAL
INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
FOR
VERTICAL AMPLIFIER AM-6787(P)/U
(TEKTRONIX MODEL 7S11 SAMPLING UNIT)
(NSN 6625-00-489-6449)
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 ATTN:
DRSEL-ME-MQ, Fort Monmouth, New Jersey 07703. 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
Administrative Storage....................................................................................................... 0-1
Destruction Army Electronics Materiel............................................................................... 0-1
i
7S11
TABLE OF CONTENTS
SECTION 1 SPECIFICATION Page
General Information 1-1
Electrical 1-1
Environmental Characteristics 1-2
Physical Characteristics 1-2
SECTION 2 OPERATING INSTRUCTIONS
General Information 2-1
Installation 2-1
Mating 2-1
First-Time Operation 2-2
Equivalent-Time Sampling Operation 2-2
Controls and Connectors 2-2
Basic Operating Information 2-2
Basic Applications 2-9
SECTION 3 BASIC SAMPLING PRINCIPLES
Introduction 3-1
Basic Sampling Techniques 3-1
Effective Sampling Time 3-4
Traveling Wave Sampling Gate 3-5
Dot Response (Loop Gain) 3-5
Smoothing 3-5
Smoothing of Random Noise 3-6
Tangential Noise 3-7
Display Sensitivity-Deflection Factor 3-7
DC Offset 3-7
Real-Time Sampling 3-8
Sweep Rates 3-8
SECTION 4 CIRCUIT DESCRIPTION
Introduction 4-1
Block Diagram 4-1
Feedback Loop and Pulse Amplifier Chain 4-1
Vertical Output Amplifier 4-1
ii
7S11
TABLE OF CONTENTS (cont)
Sweep Unit Drive 4-1
Readout Logic 4-3
Circuit Description 4-3
Trigger Logic 4-3
Post Amplifier and Attenuators 4-3
Memory 4-5
Output Amplifier 4-8
Real Time Oscillator 4-8
Gate Generator 4-9
Readout Logic 4-11
Power Distribution and Decoupling 4-11
SECTION 5 MAINTENANCE
Introduction 5-1
Preventive Maintenance 5-1
General 5-1
Cleaning 5-1
Lubrication 5-1
Visual Inspection 5-1
Calibration 5-1
Parts Identification 5-1
Parts Replacement 5-2
Troubleshooting 5-4
Introduction 5-4
Troubleshooting Aids 5-4
Troubleshooting Techniques 5-5
Transistor Checks 5-5
Diode Checks 5-5
Field Effect Transistors (FET) 5-6
SECTION 6 PERFORMANCE CHECK/CALIBRATION
Introduction 6-1
Test Equipment Required 6-1
Short Form Procedure- 6-2
Preliminary Procedure 6-3
Check -12.2-Volt Power Supply 6-5
Check Interdot Blanking 6-6
Check Dot Response and Smoothing 6-7
Adjust Memory Gate Width (R460) and
Memory Gain (C275) With Normalizer Head 6-7
iii
7S11
TABLE OF CONTENTS (cont)
Adjust Memory Gate Width (R460) and
Memory Gain (C275) With Sampling Head 6-8
Adjust Variable Balance (R305) and
Smoothing Balance (R245) 6-9
Check Deflection Factor Accuracies,
Variable Control Range and Adjust GAIN 6-10
Check Memory Overdrive Recovery 6-11
Check Vertical Signal Out 6-11
Check Vertical Gain Change in SMOOTH 6-11
Check Memory Slash 6-11
Check Delay 6-12
Check/Adjust Real Time Sampling (R415) 6-12
Check DC Offset and Adjust Position (R325) 6-12
Check Real-Time Trigger Amplifier Output 6-14
SECTION 7 ELECTRICAL PARTS LIST
Abbreviations and Symbols
Parts Ordering Information
Index of Electrical Parts List
Electrical Parts List
Parts List Abbreviations
SECTION 8 DIAGRAMS AND MECHANICAL PARTS ILLUSTRATIONS
Diagrams
Mechanical Parts Illustrations
Repackaging Instructions
SECTION 9 MECHANICAL PARTS LIST
Mechanical Parts List Information
Index of Mechanical Parts Illustrations
Mechanical Parts List
Accessories
CHANGE INFORMATION
Abbreviations and symbols used in this manual are based on or
taken directly from IEEE Standard 260 "Standard Symbols for
Units", MIL-STD-12B and other standards of the electronics
industry. Change information, if any, is located at the rear of this
manual.
iv
TM 11-6625-2750-14&P
Page
APPENDIX A. REFERENCES....................................................................................................................... A-1
APPENDIX B. COMPONENTS OF END ITEM LIST (Not Applicable)
APPENDIX C. ADDITIONAL AUTHORIZATION LIST (Not Applicable)
APPENDIX D. MAINTENANCE ALLOCATON
Section I. Introduction ............................................................................................................................ D-1
II. Maintenance Allocation Chart for Vertical Amplifier AM-6787(P)/U........................................ D-3
III. Tools and Test Equipment Requirements for Amplifier AM-6787P)/U ................................... D-4
IV. Remarks (Not Applicable)
APPENDIX E. EXPENDABLE SUPPLIES AND MATERIALS (Not Applicable)
v
TM 11-6625-2750-14&P
Fig. 1-1. 7S11 Sampling Unit.
TM 11-6625-2750-14&P
SECTION 0
INTRODUCTION
and DLAR 4500.15.
0-1. Scope
This manual describes Vertical Amplifier AM-6787(P)/- 0-4. Reporting Equipment Improvement
U, which is identified throughout this manual as Recommendations (EIR)
Tektronix Model 7S11 Sampling Unit. The manual in- If your AM-6787 (P)/U needs improvement, let us know.
cludes technical data, installation, operation and Send us an EIR. You, the user, are the only one who
maintenance instructions. Section 7 includes a Cross- can tell us what you don't like about your equipment. Let
Reference Index between the Tektronix part numbers us know why you don't like the design. Tell us why a
and the equivalent NATO/National Stock Number NSN). procedure is hard to perform. Put on an SF 368
Appendix A contains a list technical manuals and other (Quality Deficiency Report). Mail it to Commander, US
publications that pertain to the AM-6787P)/U and to Army Communications and Electronics Materiel
equipments that support it. Appendix D contains the Readiness Command, ATTN: DRSEL-ME-MQ, Fort
Maintenance Allocation Chart (MAC) which defines the Monmouth, New Jersey 07703. We'll send you a reply.
levels and scope of maintenance functions for the
equipment the Army system. 0-5. Administrative Storage
The AM-6787(P)/U can be stored in stockrooms
0-2. Indexes of Publications warehouses, or other protected facilities The equipment
a. DA Pam 310-4. Refer to the test issue of DA Pam should be protected from excessive humidity, sand, dust
310-4 to determine if there are any new editions, and chemical contaminants. Before putting the AM-
changes, or additional publications pertaining to the 6787P)/U into administrative storage, make the following
equipment. preparations:
b. DA Pam 310-7. Refer to DA Pam 310-7 to deter-
mine if the re any modification work orders (MWO's) a. Perform the preventive maintenance inspections
pertaining to he equipment. prescribed in Section 5 of this manual.
0-3. Maintenance Forms, Records, and Reports b. Refer to Section 8 of the manual for repackaging
instructions. If the required materials are available,
a . Reports of Maintenance and Unsatisfactory repackage as indicated in Section 8. If complete
Equipment. Department of the Army forms and repackaging materials are not available, at least protect
procedures used for equipment maintenance will be the unit with protective plastic or paper wrapping. Store
those prescribed by TM 38-750, The Army Maintenance the equipment in a cardboard or wooden carton with
Management System. protective packing material around it.
b. Report of item and Packaging Discrepancies. Fill c. Store the equipment indoor, protected from the
out and forward SF 364 (Report of Discrepancy (ROD)) elements. Maintain the equipment at moderate
as prescribed in AR 735-11-2/DLAR 4140.55/- temperature and humidity.
NAVSUPINST 4440.127E/AFR 400.54MCO 4430.E.
0-6. Destruction of Army Electronics Materiel
c. Discrepancy Shipment Report (DISREP)
(SF36D1).Fill out and forward Discrepancy in Shipment Destruction of Army electronics materiel to prevent
Re-port (DISREP) (SF 361) a prescribed in AR 55-38/- enemy use shall be in accordance with TM 750-244-2
NAVUPNST 4610 33B/AFR 75 18/MCO P4610 19C
0-1
7S11
SECTION 1
7S11 SPECIFICATION
Change information, if any, affecting this section will be found at the rear of the manual.
General Information TABLE 1-1 (cont)
The 7S11 Sampling Unit is a single channel vertical Characteristic Performance
amplifier plug-in unit designed for operation in Tektronix 7000- Gain Accuracy (Ratio to add Within 3% when
Series Oscilloscopes. The 7S11 accepts the S-Series to accuracies of source, NORMAL/SMOOTH function is
Sampling Heads. The Sampling Head determines the input oscilloscope, attenuators, NORMAL, with GAIN adjusted at
characteristics and the availability of a trigger pickoff. etc.) any Units/Division switch setting
Within6% when NORMAL
/SMOOTH function is SMOOTH
The S-Series Sampling Head used can be plugged into the Units/Divsion Variable Extends deflection factor from 1
7S11 or used remotely on an optional extender cable unit. The Range unit/division or less to at least 400
7S11 provides the power for the sampling head unit/division
Interconnections to the sampling head circuits are provided by
the connector in the sampling head compartment of the7S11.
GAIN Range Permits adjustment of deflection
factor at any Units/Division switch
setting for all 7000-series
oscilloscopes.
DELAY Range At leas 10 ns.
Memory Slash 0.1 division or less at 20 Hz for
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