Tektronix 2236 Bedienungsanleitung

Andere Handbücher für 2236

1

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Tektronix

COMMITTED TO EXCELLENCE

WARNING

THE FOLLOWING SERVICING INSTRUCTIONS ARE

FOR USE B QUALIFIED PERSONNEL ONL . TO

AVOID PERSONAL INJUR , DO NOT PERFORM AN

SERVICING OTHER THAN THAT CONTAINED IN

OPERATING INSTRUCTIONS UNLESS OU ARE

QUALIFIED TO DO SO. REFER TO THE OPERATORS

SAFET SUMMAR AND THE SERVICE SAFET

SUMMAR PRIOR TO PERFORMING AN SERVICE.

PLEASE CHECK FOR CHANGE INFORMATION

AT THE REAR OF THIS MANUAL.

2236

OSCILLOSCOPE

SERVICE

INSTRUCTION MANUAL

Tektronix, Inc.

P.O. Box 500

Beaverton, Oregon 97077 Serial Number

070-4204-00

Product Group 46 First Printing MAR 1983

Revised NOV 1986

Copyright © 1983 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 panel 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:

B000000 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

2236 Service

TABLE OF CONTENTS

Page

LIST OF ILLUSTRATIONS

......................................

iv

LIST OF TABLES ..................................................... v

OPERATORS SAFET SUMMMAR

......................

vi

SERVICING SAFET SUMMAR

............................

vii

SECTION 1 SPECIFICATION

INTRODUCTION

..............................

1-1

ACCESSORIES

................................

1-1

PERFORMANCE CONDITIONS .... 1-1

SECTION 2 OPERATING INSTRUCTIONS

PREPARATION FOR USE

..............

2-1

SAFET

......................................

2-1

LINE VOLTAGE

..........................

2-1

POWER CORD

............................

2-1

LINE FUSE

..................................

2-1

INSTRUMENT COOLING

............

2-2

CONTROLS, CONNECTORS, AND

INDICATORS

....................................

2-2

DISPLA , POWER, AND PROBE

ADJUST

......................................

2-2

VERTICAL

..................................

2-3

HORIZONTAL

..............................

2-4

TRIGGER

....................................

2-6

COUNTER, TIMER, AND

MULTIMETER

............................

2-8

RIGHT SIDE PANEL

....................

2-9

REAR PANEL

..............................

2-9

OPERATING CONSIDERATIONS .. . 2-11

GRATICULE

................................

2-11

GROUNDING

..............................

2-11

SIGNAL CONNECTIONS

............

2-11

INPUT COUPLING CAPACITOR

PRECHARGING

..........................

2-11

POWER-UP CHECKS

................

2-12

CTM MEASUREMENT

CONSIDERATIONS

....................

2-12

STATUS AND ERRORS

MESSAGES

................................

2-12

OPERATOR’S ADJUSTMENTS .... 2-14

INTRODUCTION

........................

2-14

BASELINE TRACE

......................

2-14

TRACE ROTATION

......................

2-14

PROBE COMPENSATION

..........

2-15

Page

SECTION 3 THEOR OF OPERATION

INTRODUCTION

..............................

3-1

SECTION ORGANIZATION

........

3-1

INTEGRATED CIRCUIT

DESCRIPTIONS

..........................

3-1

GENERAL DESCRIPTION

..............

3-2

OSCILLOSCOPE

........................

3-2

CTM

............................................

3-3

DETAILED CIRCUIT DESCRIPTION 3-4

OSCILLOSCOPE

........................

3-4

VERTICAL ATTENUATORS . . 3-4

Input Coupling

....................

3-4

Buffer Amplifier and Gain

Switching Network

............

3-5

Paraphase Amplifier

..........

3-5

VERTICAL PREAMPLIFIERS . 3-5

CHANNEL SWITCH AND

VERTICAL OUTPUT

..............

3-6

Delay Line Driver

................

3-7

Vertical Output Amplifier ... 3-7

A/B Sweep Separation

Circuit

................................

3-8

TRIGGER AMPLIFIERS AND

SWITCHING

............................

3-8

Internal Trigger Amplifier ... 3-9

A External Trigger Amplifier 3-9

Line Trigger Amplifier

........

3-9

A TRIGGER GENERATOR ... 3-9

A Trigger Level Circuit .... 3-9

A Trigger Level Comparator 3-10

A Schmitt Trigger and TV

Trigger Circuit

....................

3-10

A SWEEP GENERATOR AND

LOGIC

....................................

3-10

A Miller Sweep Generator .. 3-11

A Sweep Logic

..................

3-11

ALTERNATE B SWEEP

..........

3-12

B Miller Sweep Generator . 3-12

B Trigger Level Comparator 3-13

Runs After Delay

................

3-13

B Delay Time Position

Comparator

........................

3-13

B Sweep Logic

..................

3-13

Alternate Display Switching

Logic

..................................

3-14

B Z-Axis Logic

..................

3-14

i

2236 Service

SECTION 3

TABLE OF CONTENTS (cont)

Page Page

THEOR OF OPERATION (cont) SECTION 3 THEOR OF OPERATION (cont)

HORIZONTAL

........................

3-14 SCOPE SWEEP S STEM

Horizontal Preamplifier .... 3-14 INTERFACE

............................

3-28

X- Amplifier

......................

3-15 Delay/Delta Time Controller-

Horizontal Output Amplifier . 3-15 Digital Section

....................

3-28

Z-AXIS AMPLIFIER

................

3-16 Delay/Delta Time Controller-

Dc Restorer

........................

3-17 Analog Section

..................

3-29

POWER SUPPL AND PROBE Intensified Zone Controller . 3-29

ADJUST

..................................

3-18 DMM

......................................

3-29

Power Input

........................

3-18 Input Switching Network ... 3-32

Preregulator

......................

3-18 Input Filter

..........................

3-33

Inverter

..............................

3-19 Input Buffer

........................

3-33

Crt Supply

..........................

3-19 Rms Converter

..................

3-34

Focus Circuit

......................

3-19 Ac Compensation

..............

3-34

Low-Voltage Supplies and Multiplexer and Voltage

Fan

....................................

3-19 Reference

..........................

3-34

Probe Adjust

......................

3-20 V/F Converter

....................

3-34

CTM ............................................. 3-20 Ohms Reference

................

3-35

CPU S STEM

........................

3-20 Overload Protection

..........

3-36

Microprocessor Reset

........

3-20 Serial Interface

..................

3-36

CPU Clock and Interrupt Relay Drive

........................

3-36

Timing

................................

3-20 DMM Power Supply

..........

3-37

Address Decoding Logic ... 3-20

ROM

..................................

3-20

Buffered Data Bus Latch .. 3-21

Counter Data Bus Switch .. 3-21

DISPLA S STEM

Display Multiplexing

..........

3-21 SECTION 4 PERFORMANCE CHECK

Display and Filament Driver 3-21 PROCEDURE

INPUT/OUTPUT PORTS INTRODUCTION

..............................

4-1

Sample Counter Read Ports 3-21 PURPOSE

..........

........................

4-1

Time Counter Read Ports .. 3-22 STRUCTURE

..............................

4-1

Pushbutton Read Port .... 3-22 TEST EQUIPMENT

....................

4-1

Oscilloscope Read Port and LIMITS AND TOLERANCES . . . . 4-1

Probe Decoder

..................

3-22 PREPARATION FOR CHECKS .. 4-2

Counter Control Latch .... 3-22 INDEX TO PERFORMANCE

DMM Control Latch

..........

3-22 CHECK STEPS

..........................

4-4

Audio Transducer

..............

3-22 VERTICAL

........................................

4-5

COUNTER S STEM

..............

3-22 HORIZONTAL

..................................

4-9

Input Multiplexer

................

3-22 TRIGGER

........................................

4-12

Synchronizer

......................

3-23 C TM

..................................................

4-15

Oscillators

..........................

3-27

Phase-Locked Loop

..........

3-27

Sample and Time Counter

Chains

................................

3-27

ii

2236 Service

TABLE OF CONTENTS (cont)

Page

SECTION 5 ADJUSTMENT PROCEDURE

INTRODUCTION

..............................

5-1

PURPOSE

..................................

5-1

STRUCTURE

..............................

5-1

TEST EQUIPMENT

....................

5-1

LIMITS AND TOLERANCES .... 5-1

ADJUSTMENT INTERACTION . . 5-1

PREPARATION FOR

ADJUSTMENT

............................

5-1

INDEX TO ADJUSTMENT

PROCEDURE STEPS

................

5-3

POWER SUPPL AND CRT DISPLA 5-4

VERTICAL

........................................

5-6

HORIZONTAL

..................................

5-15

TRIGGER ......................................... 5-20

C TM ................................................... 5-24

SECTION 6 MAINTENANCE

STATIC-SENSITIVE COMPONENTS 6-1

PREVENTIVE MAINTENANCE

........

6-2

INTRODUCTION

........................

6-2

GENERAL CARE

........................

6-2

INSPECTION AND CLEANING . . 6-2

LUBRICATION

............................

6-5

SEMICONDUCTOR CHECKS ... 6-5

PERIODIC READJUSTMENT ... 6-5

TROUBLESHOOTING

......................

6-5

INTRODUCTION

........................

6-5

TROUBLESHOOTING AIDS .... 6-5

TROUBLESHOOTING

EQUIPMENT

..............................

6-7

TROUBLESHOOTING

TECHNIQUES

............................

6-7

CTM TROUBLESHOOTING

PROCEDURE

..............................

6-10

CORRECTIVE MAINTENANCE

___

6-22

INTRODUCTION

........................

6-22

MAINTENANCE PRECAUTIONS . 6-22

Page

SECTION 6 MAINTENANCE (cont)

OBTAINING REPLACEMENT

PARTS

........................................

6-22

MAINTENANCE AIDS

................

6-22

INTERCONNECTIONS

................

6-22

TRANSISTORS AND

INTEGRATED CIRCUITS .... 6-24

SOLDERING TECHNIQUES .... 6-24

REMOVAL AND REPLACEMENT

INSTRUCTIONS

..........................

6-25

Cabinet

....................................

6-25

CTM Circuit Board

..................

6-25

Display Circuit Board

..............

6-27

Cathode-Ray Tube

..................

6-28

Power-Supply Shield

..............

6-29

Filter Circuit Board

..................

6-29

Alt Sweep Circuit Board

........

6-29

Attenuator and Logic Switch

Circuit Board

..........................

6-30

Timing Circuit Board

..............

6-31

Bottom Shield, Attenuator and

Timing Circuit-Board Module .. 6-32

Front-Panel Circuit Board .... 6-32

Main Circuit Board

..................

6-34

REPACKAGING FOR SHIPMENT 6-35

SELECTABLE COMPONENTS .. 6-36

SECTION 7 OPTIONS

SECTION 8 REPLACEABLE ELECTRICAL PARTS

SECTION 9 DIAGRAMS

SECTION 10 REPLACEABLE MECHANICAL

PARTS

ACCESSORIES

CHANGE INFORMATION

2236 Service

LIST OF ILLUSTRATIONS

Figure Page Figure Page

1-1 Maximum input voltage vs frequency 3-12 Typical waveforms for the Delay function

derating curve for CH 1 OR X & DMM, CH 2 with Valt LO

..............................................

3-30

OR .and EXT INPUT connectors

............

1-17 3-13 Typical waveforms for the Delta Time func-

1-2 Physical dimensions of the 2236 Oscillo- tion with Valt HI

........................................

3-31

scope

..........................................................

1-18 3-14 Typical waveforms for the Delta Time func-

tion with Valt L O

........................................

3-32

2-1 Optional power cords

................................

2-1

2-2 Fuse holder and power cord connector ... 2-2 4-1 Test setup for DMM common mode check . 4-21

2-3 Power and display controls and indicators

and PROBE ADJUST output

....................

2-3

2-4 Vertical controls and connectors

................

2-3 6-1 Multi-connector holder orientation

............

6-7

2-5 Horizontal controls

....................................

2-5 6-2 Period measurement loop test waveforms . 6-19

2-6 Trigger controls, connector, and indicator . 2-6 6-3 Width measurement loop test waveforms . 6-20

2-7 Counter, timer, and multimeter controls and 6-4 DMM serial interface loops test waveforms 6-21

indicator

......................................................

2-8

2-8 Multimeter right side panel connectors .... 2-10

2-9 Rear panel connector

................................

2-10 9-1 Color codes for resistors and capacitors

2-10 Graticule measurement markings

..............

2-11 9-2 Semiconductor lead configurations

2-11 Probe compensation

..................................

2-15 9-3 Locating components on schematic dia-

grams and circuit board illustrations

9-4 Oscilloscope basic block diagram

3-1 Block diagram of the Vertical Attenuators . 3-4 9-5 Oscilloscope detailed block diagram

3-2 Block diagram of the Channel Switching 9-6 CTM basic block diagram

circuitry

......................................................

3-6 9-7 CTM detailed block diagram

3-3 Block diagram of the A Sweep Generator 9-8 Circuit board location illustration

and Logic circuitry

......................................

3-11 9-9 A2-Attenuator board

3-4 Block diagram of the Horizontal Amplifier . 3-15 9-10 A15-Logic Switch board

3-5 Simplified diagram of the Dc Restorer 9-11 Al-Main board

circuitry

......................................................

3-17 9-12 Circuit view of Al-Main board

3-6 Simplified diagram of the Period measure- 9-13 A3-Front Panel board

ment circuitry

..............................................

3-23 9-14 Circuit view of A3-Front Panel board

3-7 Typical waveforms for the Nongated Period 9-15 A4-Timing board

function

......................................................

3-24 9-16 A5-Altn Sweep logic board

3-8 Typical waveforms for the Gated Period 9-17 A6-Filter board

function

......................................................

3-25 9-18 A12-Multimeter Control board

3-9 Simplified diagram of the Width measure- 9-19 A10-Counter/Timer/Multimeter board

ment circuitry

..............................................

3-25 9-20 A14-Hot Signal Switch board

3-10 Typical waveforms for the Width function . 3-26 9-21 A13-Display board

3-11 Typical waveforms for the Delay function 9-22 Partial A11-Counter/Timer/Multimeter board

with Valt HI

................................................

3-29 with Option 14

iv REV JAN 1985

2236 Service

LIST OF TABLES

Table Page Table Page

1-1 Electrical Characteristics

..........................

. 1-2 5-3 Deflection Accuracy Limits

......................

. 5-9

1-2 Environmental Characteristics

....................

. 1-16 5-4 Settings for Bandwidth Checks

..............

. 5-12

1-3 Physical Characteristics

..........................

. 1-17 5-5 Settings for Timing Accuracy Checks .... . 5-17

5-6 Switch Combinations for A Triggering

2-1 VERT MODE Trigger Source

....................

. 2-7 Checks

......................................................

. 5-22

2-2 Power-up Checks

......................................

. 2-12 5-7 Dc Voltage Readout Checks

....................

. 5-27

2-3 Equipment Required for 10X Probe 5-8 Ac Voltage Readout Checks

....................

. 5-27

Compensation ............................................. 2-16 5-9 Dc Probe Readout Checks

......................

. 5-28

5-10 Ac Probe Readout Checks

......................

. 5-29

4-1 Test Equipment Required

..........................

. 4-2 5-11 Resistance Readout Checks

....................

. 5-29

4-2 Deflection Accuracy Limits

........................

. 4-5

4-3 Settings for Bandwidth Checks

..............

. 4-7

4-4 Settings for Timing Accuracy Checks .... . 4-10 6-1 Relative Susceptibility to Static-Discharge

4-5 Switch Combinations for A Triggering Damage

......................................................

. 6-1

Checks

......................................................

. 4-12 6-2 External Inspection Checklist

....................

. 6-3

4-6 Dc Voltage Readout Checks

......................

. 4-17 6-3 Internal Inspection Checklist

......................

. 6-3

4-7 Ac Voltage Readout Checks

....................

. 4-17 6-4 Power Supply Limits and Ripple

................

. 6-8

4-8 Dc CH 1 Readout Checks

........................

. 4-18 6-5 Control Switches Verification Readout . . . . 6-12

4-9 Dc Probe Readout Checks

......................

. 4-18 6-6 Channel 1 Logic Verification

....................

. 6-12

4-10 Ac.CH 1 Readout Checks

........................

. 4-18 6-7 Test 1-ROM Check Test Messages

........

. 6-13

4-11 Ac Probe Readout Checks

......................

. 4-18 6-8 Test 2-Counter Error Messages

..............

. 6-14

4-12 Resistance Readout Checks

....................

. 4-19 6-9 Test 3-DMM Test Error Codes

................

. 6-16

6-10 Test 4 Extended Counter Error Messages . 6-17

5-1 Adjustment Interactions

..........................

. 5-2 6-11 Maintenance Aids

....................................

. 6-23

5-2 Power Supply Limits

................................

. 5-4 6-12 Trigger Bandwidth Alternation

................

■ 6-36

v

2236 Service

OPERATORS SAFET SUMMAR

The general safety information in this part of the summary is for tooth operating and servicing personnel. Specific warnings and

cautions will be found throughout the manual where they apply and do 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.

Terms as Marked on Equipment

CAUTION indicates a personal injury hazard not immedi

ately accessible as one reads the markings, or a hazard to

property, including the equipment itself.

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 connecting 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.

Danger Arising From Loss of Ground

Upon loss of the protective-ground connection, all accessi

ble conductive parts (including knobs and controls that may

appear to be insulating) can render an electric shock.

DANGER indicates a personal injury hazard immediately ac

cessible as one reads the marking.

Symbols in This Manual

This symbol indicates where applicable

cautionary or other information is to be found.

For maximum input voltage see Table 1-1.

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.

For detailed information on power cords and connectors see

Figure 2-1.

Symbols As Marked on Equipment

DANGER — High voltage.

Protective ground (earth) terminal.

ATTENTION — Refer to manual.

Power Source

This product is intended to operate from a power source

that does not apply more than 250 volts rms between the

supply conductors or between either supply conductor and

ground. A protective ground connection by way of the

grounding conductor in the power cord is essential for safe

operation.

Use the Proper Fuse

To avoid fire hazard, use only a fuse of the correct type,

voltage rating and current rating as specified in the parts list

for your product.

Do Not Operate in Explosive Atmospheres

To avoid explosion, do not operate this product in an explo

sive atmosphere unless it has been specifically certified for

such operation.

Do Not Remove Covers or Panels

To avoid personal injury, do not remove the product covers

or panels. Do not operate the product without the covers

and panels properly installed.

vi

2236 Service

SERVICING SAFET SUMMAR

FOR Q ALIFIED SERVICE PERSONNEL ONLY

Refer also to the preceding Operators Safety Summary.

Do Not Service Alone

Do not perform internal service or adjustment of this prod

uct 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

or components while power is on.

Disconnect power before removing protective panels, sol

dering, or replacing components.

Power Source

This product is intended to operate from a power source

that does not apply more than 250 volts rms between the

supply conductors or between either supply conductor and

ground. A protective ground connection by way of the

grounding connector in the power cord is essential for safe

operation.

2236 Service

viii

The 2236 Oscilloscope.