Tektronix 7S11 Bedienungsanleitung

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- ’•/

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

6-12

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

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

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.

Andere Handbücher für 7S11

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