Tektronix 7S11 User manual

Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon
070-0985-00
Product Group 42
IbktroniX'
COMMITTED TO EXCELLENCE
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL
7S11
SAMPLING
UNIT
INSTRUCTION MANUAL
97077 Serial Number
First Printing FEB 1970
Revised MAY 1985
vii 'nte’ ti'tm’ P-im- ’•/

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 aregistered trademark of Tektronix U.K. Limited.
Printed in U.S.A. Specification and price change privileges
are reserved.
INSTRUMENT SERIAL NUMBERS
Each instrument has aserial number on apahel 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 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

7S11
TABLE OF CONTENTS
SECTION 1
SECTION 2
SPECIFICATION Page
General Information 1-1
Electrical 1-1
Environmental Characteristics 1-2
Physical Characteristics 1-2
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
THE FOLLOWING SERVICE INSTRUCTIONS ARE FOR USE BY OUALIFIED 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 3BASIC 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 I

7S11
TABLE OF CONTENTS (cont)
SECTION 4CIRCUIT 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 5MAINTENANCE
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 6PERFORMANCE 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

7S11
TABLE OF CONTENTS (cont)
Adjust Variable Balance (R305) and
Smooting Balance (R245)
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 (R415)
Check DC Offset and Adjust Position (R325)
Check Real-Time Trigger Amplifier Output
SECTION 7ELECTRICAL PARTS LIST
Abbreviations and Symbols
Parts Ordering Information
Index of Electrical Parts List
Electrical Parts List
SECTION 8DIAGRAMS AND MECHANICAL PARTS ILLUSTRATIONS
Diagrams
Mechanical Parts Illustrations
Repackaging Instructions
SECTION 9MECHANICAL 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 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.
Page
6-9
6-10
6-11
6-11
6-11
6-11
6-12
6-12
6-12
6-14
REV FEB 1984

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.
IN THIS MANUAL
TERMS
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 apersonal injury hazard not immediately accessible as one reads the marking, or ahazard to property
including the equipment itself.
DANGER indicates apersonal injury hazard immediately accessible as one reads the marking.
IN THIS MANUAL
SYMBOLS
Static-Sensitive Devices
This symbol indicates where applicable cautionary or other information is to be found.
AS MARKED ON EQUIPMENT
DANGER—High voltage.
AProtective ground (earth) terminal. ATTENTION—refer to manual.
WARNINGS
POWER SOURCE
This product is intended to operate from apower source that will not apply mare than 250 volts rms between the supply
conductors or between either supply conductor and ground. Aprotective 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 apower 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 aproperly wired receptacle before making connections to the product input or output terminals. Aprotective ground
connection by way of the grounding conductor in the power cord is essential for safe operation.
IV ADD FEB 1984

7S11
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

FINE
DC OFFSET ±1V
DELAY
nons RANGE)
INVERT
VARIABLE (CAL IN!
DOT RESPONSE
NORMAL
mVOLTS/DIV
TYPE S-5
SAMPLING HEAD
+1V TO -1V
100V MAX DC
COUPLING
VERT SIS OUT
.2V/DIV flJKO
GNO
TEKTHONIX®
TEKTRONIX® SAMPLING UNIT
Fig. 1-1, 7S11 Sampling Unit,
7S11

7S11
SECTION 1
7S11 SPECIFICATION
Change information, if any, affecting this section will be found at the rear of the manual.
General Information
The 7S11 Sampling Unit is asingle 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 atrigger pickoff.
The S-Series Sampling Head used can be plugged into the
7S1 1or 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 a7T11 Sampling Sweep Unit operated in
the center plug-in compartments of a7000-Series
oscilloscope provide a single channel sampling system. Two
7S11's and one 7T11 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 atrigger pickoff is provided in the sampling head,
interconnections between two 7S11's and the 7T11
through the fixed and movable shoes provide atrigger
selection circuit to trigger the 7T11. An internally
reconstructed signal is provided to trigger areal-time
time-base such as the 7B50.
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.
TABLE 1-1
ELECTRICAL
Characteristic Performance
Deflection Factor
Units/Division
Range
2to 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
(Ratio to add
to accuracies of
source, oscillo-
scope, attenu-
ators, etc.)
Within 3% when NORMAL/
SMOOTH function is NORMAL,
with GAIN adjusted at any Units/
Division switch setting. Within 6%
when NORMAL/SMOOTH func-
tion is SMOOTH.
Units/Division
Variable Range Extends deflection factor from 1 unit/division or less to at least 400
units/division.
GAIN Range Permits adjustment of deflection
factor at any Units/Division switch
setting 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 0°C to less
than 30°C.
DC OFFSET
Range
-t1 volt to —1 volt or more.'
OFFSET OUT
Range -flO volts to —10 volts or more.
Relation to
actual Offset
Actual Offset =(0.1) (Offset Out)
within 2%.
Source resistance
(related to
actual Offset)
10 kn within 1%.
VERTical SIGnal
OUT
..,, , 200
(Signal input in volts) (. ,.j
Units/Div
within 2%. 2.4 volts peak-to-peak
maximum.
Amplitude in
volts
(Referenced
to input)
Deflection factor
(Referenced
to CRT)
200 mV/displayed division within
3% in +UP or INVERT.
Source resistance 10 kfii within 0.5%.
'unless otherwise stated on sampling head front-panel.
1-1

Specification—7S1
1
ENVIRONMENTAL CHARACTERISTICS
Storage-altitude up to 50,000 feet or 15,000 meters and
—55 C. Operating characteristics are the same as those
listed in the 7000-series oscilloscope manual.
PHYSICAL CHARACTERISTICS
Dimensions
Height 5inches (12.7 centimeters)
Width 3inches (7.6 centimeters)
Length 14 1/2 inches (37 centimeters)
Approximate dimensions including knobs and connec-
tors.
Finish Front panel is anodized aluminum.
Weight
Net About 2pounds (0.9 kilogram).
Shipping About 31/4 pounds (1.46 kilo-
grams).
STANDARD ACCESSORIES
Standard accessories supplied with the 7S1 1are listed on
the last page of the Mechanical Parts List section. For
optional accessories available for use with this instrument,
see the Tektronix, Inc. catalog.