Tektronix 7S11 User manual

Tektronix, Inc.
It!ktron~
COMMITTED TO EXCELLENCE
WARNING
THE FOLLOWING SERVICING INSTRUCTIONS
ARE FOR USE BY QUALIFIED PERSONNEL
ONLY. TO AVOID PERSONAL INJURY,
DO NOT
PERFORMANYSERVICING OTHERTHANTHAT
CONTAINED
IN OPERATING INSTRUCTIONS
UNLESS YOU ARE QUALIFIED TO
DO SO.
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL.
7S11
SAMPLING
UNIT
INSTRUCTION MANUAL
P.O. Box 500
Beaverton,Oregon 97077 Serial Number:
____ _
070-0985-00
Product Group 42
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First Printing FEB 1970
Revised FEB 1989

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Copyright @ 1970 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
pa~el 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
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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
WARNING'
THE FOLLOWING SERVICEINSTRUCTIONS 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 QUALI-
FIED
TO DO So.
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
3-6
Display Sensitivity-Deflection Factor
3-7
DC Offset
3-7
Real-Time
Sampling
3-8
Sweep Rates 3-8
REV FEB 1984
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7811
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7S11
TABLE
OF CONTENTS
(cont)
SECTION 4 CIRCUIT DESCRIPTION Page
Introduction 4-1
Block Diagram 4-1
Feedback Loop and Pulse Amplifier Chain 4-1
Vertical
Output Amplifier
4-1
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
Repackaging for Shipment
5-7
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 Smooting
6-7
Adjust Memory Gate Width (R460) and
Memory Gain (C275) With Normalizer Head 6-7
Adjust Memory Gate Width (R460) and
Memory Gain (C275) With Sampling Head 6-8
ii
REV FEB 1984
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REV FEB 1984
TABLE OF CONTENTS (cont)
SECTION 7
SECTION 8
SECTION 9
Adjust Variable Balance (R30S) and
Smooting Balance (R24S)
Check Deflection Factor Accuracies,
Variable Control Range and Adjust GAIN
Check Memory Overdrive Recovery
Check Vertical Signal Out
Check Vertical Gain Change in SMOOTH
Check Memory Slash
Check Delay
Check/Adjust Real Time Sampling (R41S)
Check DC Offset and Adjust Position (R32S)
Check Real-Time Trigger Amplifier Output
ELECTRICAL PARTS LIST
Abbreviations and Symbols
Parts Ordering Information
Index of Electrical Parts List
Electrical Parts List
DIAGRAMS AND MECHANICAL PARTS ILLUSTRATIONS
Diagrams
Mechanical Parts Illustrations
Repackaging Instructions
MECHANICAL PARTS LIST
Mechanical Parts List Information
Index of Mechanical Parts Illustrations
Mechanical Parts List
Accessories
CHANGE INFORMATION
Page
6-9
6-10
6-11
6-11
6-11
6-11
6-12
6-12
6-12
6-14
Abbreviations and symbols used in this manual are based on or taken di-
rectly 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.
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7511
iii
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7S11
SAFETY SUMMARY
The general safety information contained in this summary is for 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.
Protective ground (earth) terminal.
ATTENTION-refer to manual.
WARNINGS
POWER SOURCE
This product is intended to operate from a power source that will not apply mare than 250 volts rms between the supply
conductors or between either supply conductor and ground. A protective ground connection by way of the grounding conduc-
tor
in the power cord is essential for safe operation.
USE THE PROPER POWER CORD
Use only the power cord and connector specified for your product. Use only a power cord that is in good condition.
GROUNDING THE PRODUCT
This product is grounded through the grounding conductor of the power cord. To avoid electrical shock, plug the power cord
into a properly wired receptacle before making connections to the product input or output terminals. A protective ground
connection
by way of the grounding conductor in the power cord is essential for safe operation.
iv ADD FEB 1984
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7511
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.
USE THE PROPER FUSE
To avoid hazard, use only the fuse specified in the parts list for your product, and which is identical in type, voltage rating, and
current rating.
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 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.
SILICONE GREASE HANDLING
Handle silicone grease with care. Avoid getting the silicone grease in your eyes. Wash hands thoroughly after using silicone
grease.
ADD FEB 1984 v
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-
DElAV
' ...... "#Io H QII
•. ~
, .. ..-.
SAMPUNO UNIT
7511
Fi9. 1·1. 7511 Sim pli ng Unit.
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7811
SECTION 1
7S11 SPECIFICA TION
Change information, if any, affecting this section will be found at the rear of the manual.
General Information
The 7S11 Sampling Unit is a single channel vertical
amplifier plug-in
unit designed for operation in Tektronix
7000-Series Oscilloscopes. The 7S11 accepts the S-Series
Sampling Heads. The Sampling
Head determines the input
characteristics and the availability of a trigger pickoff.
The S-Series Sampling Head used can be plugged into the
7S11 or used remotely on an optional extender cable unit.
The 7S11 provides the power for the sampling head.
Interconnections
to the sampling head circuits are provided
by the connector in the sampling head compartment of the
7S11.
The
7S11 and a 7Tll Sampling Sweep Unit operated in
the center plug-in compartments
of a 7000-Series
oscilloscope provide a single channel sampling system.
Two
7S11's and one 7Tll provide dual-trace sampling, using the
electronic switching in the oscilloscope vertical amplifier.
X-Y operation is provided by two 7S11's operated in the
center plug-in compartments
of the oscilloscope.
If a trigger pickoff is provided in the sampling head,
interconnections between
two 7S11's and the 7Tll
through the fixed and movable shoes provide a trigger
selection
circuit to trigger the 7Tl1. An internally
reconstructed signal
is provided to trigger a real-time
time-base
such as the 7850.
Sampled signals are presented to both the oscilloscope
vertical
amplifier and to the front panel connectors for
external use with auxiliary equipment such as pen
recorders.
Characteristic
Deflection Factor
Units/Division
Range
®I
TABLE 1-1
ELECTRICAL
Performance
2
to 200 in seven steps in 1, 2, 5
sequence. The Units/Division are
those labeled on the sampling head.
TABLE 1-1 (cont)
Characteristic Performance
Gain Accuracy
Within 3%
when
NORMAL/
(Ratio to add SMOOTH function
is I\IORMAL,
to accuracies of
with GAl N adjusted at any Units/
source, oscillo- Division switch setting.
Within 6%
scope, attenu- when NORMAL/SMOOTH
func-
ators, etc.)
tion is SMOOTH.
Units/Division Extends deflection
factor from
1
Variable Range
unit/division or less to at least 400
units/division.
GAIN Range
Permits adjustment of deflection
factor at any Units/Division switch
setti
ng for all 7000-series oscillo-
scopes.
DELAY Range
At least 10 ns.
Memory Slash
0.1 division or less at 20 Hz for
ambient temperature of O°C to less
than 30°C.
DC OFFSET
+1 volt to -1 volt or more.1
Range
OFFSET OUT
Range +10 volts
to -10 volts or more.
Relation
to
Actual Offset = (0.1) (Offset Out)
actual Offset
within 2%.
Source resistance 10 kn within 1%.
(related to
actual Offset)
VERTical SIGnal
OUT
Amplitude in (Signal input in volts) (U 2?0 /0' )
volts
nits IV
within 2%. 2.4 volts peak-to-peak
( Referenced maximum.
to input)
Deflection factor
200 mV/displayed division within
(Referenced
3% in +UP or INVERT.
to CRT)
Source resistance 10
kn within 0.5%.
1Unless otherwise stated on sampling head front-panel.
1-1
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