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Tektronix*

455/A2/B2

PORTABLE

OSCILLOSCOPE

WITH OPTIONS

I N S T R U C T I O N M A N U A L

Tektronix, Inc.

P.O. Box 500

Be verton, Oregon

070-1907-01

Product Group 40

Tektronix

COMMITTED TO EXCELLENCE

PLEASE CHECK FOR CHANGE INFORMATION

AT THE REAR OF THIS MANUAL.

455/A2/B2

PORTABLE

OSCILLOSCOPE

WITH OPTIONS

I N S T R U C T I O N M A N U A L

97077 Seri l Number

__________________

First Printing MAR 1975

Revised OCT 1983

Copyright © 1975 Tektronix, Inc. All rights reserved.

Contents of this public tion m y not be reproduced in ny

form without the written permission of Tektronix, Inc.

Products of Tektronix, Inc. nd its subsidi ries re covered

by U.S. nd foreign p tents nd/or pending p tents.

TEKTRONIX, TEK, SCOPE-MOBILE, nd re

registered tr dem rks of Tektronix, Inc. TELEQUIPMENT

is registered tr dem rk of Tektronix U.K. Limited.

Printed in U.S.A. Specific tion nd price ch nge privileges

re reserved.

INSTRUMENT SERIAL NUMBERS

E ch instrument h s seri l number on p rtel insert, t g,

or st mped on the ch ssis. The first number or letter

design tes the country of m nuf cture. The l st five digits

of the seri l number re ssigned sequenti lly nd re

unique to e ch instrument. Those m nuf ctured in the

United St tes h ve six unique digits. The country of

m nuf cture is identified s follows:

B000000 Tektronix, Inc., Be verton, Oregon, USA

100000 Tektronix Guernsey, Ltd., Ch nnel Isl nds

200000 Tektronix United Kingdom, Ltd., London

300000 Sony/Tektronix, J p n

700000 Tektronix Holl nd, NV, Heerenveen,

The Netherl nds

TABLE OF CONTENTS

P ge

List of Illustrations iv

List of Tables v

Safety Su ary vii

OPERATOR S INSTRUCTIONS

SECTION 1 — SPECIFICATIONS

455 Main Module 1-1

A2 Vertical Module 1-5

B2 Horizontal Module 1-7

Reco ended Accessories 1-11

SECTION 2 — OPERATING INSTRUCTIONS

Operating Voltage 2-1

Safety Infor ation 2-1

Functions of Controls, Connectors, and Indicators 2-1

455 Main Module 2-1

A2 Vertical Module 2-3

B2 Horizontal Module 2-5

Basic Applications and Measure ents 2-8

Peak-to-Peak A plitude Measure ents 2-8

Instantaneous A plitude Measure ent 2-8

Dual Trace Phase Difference Measure ent 2-8

High Resolution Phase Measure ent 2-9

Co on Mode Rejection 2-10

Cascaded Operation 2-10

Ti e Duration Frequency Measure ents 2-10

Riseti e Measure ents 2-11

Differential Ti e Measure ents 2-11

Delayed Sweep Magnification 2-13

SECTION 3 — PERFORMANCE CHECK

Options 3-1

Test Equip ent Required 3-1

Preli inary Procedure 3-2

Perfor ance Check Procedure 3-2

SERVICING INSTRUCTIONS

FOR QUALIFIED SERVICE PERSONNEL ONLY

SECTION 4 — CIRCUIT DESCRIPTION

Basic Circuit Functions 4-1

455 Main Module 4-1

A2 Vertical Module 4-1

B2 Horizontal Module 4-2

Detailed Circuit Operation 4-3

Calibrator 4-3

Multivibrator 4-3

Output A plifier 4-3

Horizontal Output A plifier 4-3

Sweep Gate A plifier 4-3

455/A2/B2

TABLE OF CONTENTS (cont)

SECTION 4 — CIRCUIT DESCRIPTION (cont) P ge

Crt Circuit 4-4

High-Voltage Oscillator 4-4

High-Voltage Regulator 4-4

High-Voltage Circuitry 4-5

Crt Control Circuits 4-5

Z Axis A plifier 4-5

Low-Voltage Power Supply 4-5

Power Input 4-5

Secondary Circuit 4-6

Channel 1 and Channel 2 Input Circuits 4-7

Scale Factor Control 4-7

Input Coupling and Volts/Division Switching 4-7

FET Input Source Follower 4-7

Vertical Prea plifier and Switching 4-7

Prea plifier and Channel Switching Gates 4-7

Channel Switching Multivibrator 4-10

Vertical Output A plifier 4-11

Delay-Line Driver 4-11

Nor al Trigger Pickoff 4-11

Vertical Output A plifier 4-11

Trigger Input 4-12

Trigger Coupling 4-12

Input Source Follower 4-12

Trigger, Sweep, and Horizontal Prea plifier 4-12

A and B Trigger Generators 4-12

Sweep Generator IC's 4-15

Miller Sweep Generator 4-15

Sweep Control 1C 4-16

Sweep Control Operation 4-17

A Sweep Mode 4-17

B Dly'd Sweep Mode 4-18

A Inten Sweep Mode 4-18

Horizontal Prea plifier 1C 4-19

SECTION 5 — MAINTENANCE

Cabinet Re oval 5-1

Preventive Maintenance 5-1

Cleaning 5-1

Interior 5-1

Switch Contacts 5-2

Exterior 5-2

Crt 5-2

Visual Inspection 5-2

Lubrication 5-2

Se iconductor Checks 5-2

Recalibration 5-2

Corrective Maintenance 5-3

Obtaining Replace ent Parts 5-3

Standard Parts 5-3

Special Parts 5-3

Ordering Parts 5-3

455/A2/B2

TABLE OF CONTENTS (cont)

SECTION 5 — MAINTENANCE (cont) P ge

Soldering Techniques 5-3

Co ponent Re oval and Replace ent 5-4

Rear Panel Asse bly Re oval 5-4

Cabinet Botto Re oval 5-4

Interconnecting Cable and Pin Connector

Replace ent 5-4

Shaft-Knob Re oval 5-6

Cathode Ray Tube (Crt) Re oval 5-6

Vertical Module Re oval 5-7

Scale-Factor LED Replace ent 5-7

VOLTS/DIV Switch Asse bly Re oval 5-9

Substrate or Contact Replace ent

Considerations 5-9

Actuator Asse bly Replace ent

Considerations 5-9

Hybrid 1C Re oval 5-10

Horizontal Module Re oval 5-11

Board Locations 5-11

A and B Ti ing Switch Board Re oval 5-12

Trigger Board Re oval 5-13

Horizontal Board Re oval 5-13

Troubleshooting 5-14

Troubleshooting Aids 5-14

Troubleshooting Chart 5-14

Diagra s 5-14

Circuit Board Illustrations 5-14

Co ponent Value Identification 5-14

Se iconductor Lead Configurations 5-14

Troubleshooting Equip ent 5-14

Troubleshooting Techniques 5-16

Check Control Settings 5-16

Check Associated Equip ent 5-16

Check Instru ent Calibration 5-16

Visual Check 5-16

Isolate Trouble to a Circuit 5-16

Check Circuit Board Interconnections 5-16

Check Voltages and Wavefor s 5-16

Check Individual Co ponents 5-16

Repair and Readjust the Circuit 5-17

Repackaging For Ship ent 5-20

SECTION 6 — ADJUSTMENTS

Tolerances 6-1

Adjust ent Interaction 6-1

Partial Procedures 6-1

Test Equip ent Required 6-1

A. Main Module 6-3

Preli inary Procedure 6-3

Procedure 6-3

B. Vertical Module 6-6

C. Horizontal Module 6-10

in

REV. C, NOV. 1977

TABLE OF CONTENTS (cont)

SECTION 7 — INSTRUMENT OPTIONS

SECTION 8 — REPLACEABLE ELECTRICAL PARTS

SECTION 9 — DIAGRAMS AND CIRCUIT BOARD

ILLUSTRATIONS

SECTION 10 — REPLACEABLE MECHANICAL PARTS

Accessories

CHANGE INFORMATION

LIST OF ILLUSTRATIONS P ge

Fig. 1-1. Di ensional drawing. 1-4

Fig. 1-2. Trigger coupling and sensitivity. 1-7

Fig. 1-3. Differential Ti e Measure ent accuracy. 1-10

Fig. 2-1. 455 Main Module (front). 2-1

Fig. 2-2. 455 Main Module (rear). 2-2

Fig. 2-3. A2 Vertical Module. 2-3

Fig. 2-4. B2 Horizontal Module. 2-5

Fig. 2-5. Peak-to-peak voltage easure ent. 2-8

Fig. 2-6. Instantaneous voltage easure ent. 2-8

Fig. 2-7. Phase difference. 2-9

Fig. 2-8. High-resolution phase difference. 2-9

Fig. 2-9. Co on- ode rejection. 2-10

Fig. 2-10. Ti e duration. 2-11

Fig. 2-11. Riseti e. 2-11

Fig. 2-12. Ti e duration between points on a wavefor . 2-12

Fig. 2-13. Ti e difference between pulses. 2-12

Fig. 2-14. Delayed Sweep agnification. 2-13

Fig. 3-1. A plitude calibrator test setup. 3-3

Fig. 3-2. Fast-rise pulse generator test setup. 3-4

Fig. 3-3. Sine-wave generator test setup #1. 3-5

Fig. 3-4. Low-frequency generator test setup. 3-6

Fig. 3-5. Sine-wave generator test setup #2. 3-7

Fig. 3-6. Ti e- ark generator test setup. 3-10

Fig. 4-1. High-voltage oscillator wavefor relationships. 4-4

Fig. 4-2. Foldback circuit action. 4-6

Fig. 4-3. Attenuator and gain switching sequences. 4-8

Fig. 4-4. Channel Switching gates. 4-9

Fig. 4-5. Trigger 1C functional block diagra . 4-13

Fig. 4-6. Sweep generator 1C functional block diagra . 4-14

Fig. 4-7. Sweep control 1C functional block diagra . 4-17

Fig. 4-8. Sweep operation in A ode. 4-18

Fig. 4-9. Sweep-circuit wavefor relationships. 4-19

Fig. 4-10. Sweep operation in B DLY'D ode. 4-20

455/A2/B2

TABLE OF CONTENTS (cont)

LIST OF ILLUSTRATIONS (cont) P ge

Fig. 5-1. Rear-panel asse bly re oval. 5-4

Fig. 5-2. Cabinet botto re oval. 5-5

Fig. 5-3. Pin connector replace ent. 5-5

Fig. 5-4. Shaft-knob re oval. 5-6

Fig. 5-5. Vertical Module re oval. 5-7

Fig. 5-6. LED replace ent. 5-7

Fig. 5-7. VOLTS/DIV switch disasse bly. 5-8

Fig. 5-8. Hybrid 1C replace ent. 5-10

Fig. 5-9. Horizontal Module re oval. 5-11

Fig. 5-10. Circuit board locations. 5-11

Fig. 5-11. A and B ti ing switch diassse bly. 5-12

Fig. 5-12. Co ponent value identification. 5-15

Fig. 5-13. Troubleshooting chart. 5-18

Fig. 6-1. +32 volt adjust ent location. 6-4

Fig. 6-2. Z axis co pensation adjust ent location. 6-4

Fig. 6-3. Crt and calibrator adjust ent locations. 6-5

Fig. 6-4. Vertical adjust ent locations. 6-9

Fig. 6-5. Sweep adjust ent locations. 6-10

Fig. 6-6A Horizontal and Trigger adjust ent locations

SN B044420-UP. 6-11

Fig. 6-6B. Horizontal and Trigger adjust ent locations

below SN B044420. 6-11

Fig. 6-7. C232 and C233 adjust ent locations. 6-13

Fig. Option 4-1. Partial Power Supply diagra . Option 4 Page 1

Fig. Option 5-1. Block diagra . Option 5 Page 8

Fig. Option 5-2. Inverting/non-inverting a plifier block diagra . Option 5 Page 9

Fig. Option 7-1. Power switch. Option 7 Page 1

Fig. Option 7-2. Dc voltage selector switch and dc input connector. Option 7 Page 2

Fig. Option 7-3. Si plified block diagra . Option 7 Page 3

Fig. Option 7-4. Adjust ent Locations. Option 7 Page 6

LIST OF TABLES

1-1. Electrical (455 Main Module). 1-1

1-2. Environ ental. 1-3

1-3. Physical. 1-3

1-4. Electrical (A2 Vertical Module). 1-5

1-5. Electrical (B2 Horizontal Module). 1-7

3-1. Test Equip ent Required. 3-1

3-2. Vertical Deflection Accuracy. 3-3

3-3. A and B Ti ing Accuracy. 3-10

3-4. A and B Magnified Accuracy. 3-11

3-5. Differential Ti e Accuracy. 3-12

5- 1. Power Supply Tolerance and Ripple. 5-16

6- 1. Test Equip ent Required for Adjust ent Procedure. 6-1

6-2. Low-Frequency Input Co pensation. 6-7

1. Sync Separator Trigger Sensitivity. Option 5 Page 1

1. Option 7 Power Sources. Option 7 Page 2

REV C AUG 1980

V

OPERATORS SAFETY SUMMARY

455/A2/B2

The gener l s fety inform tion in this p rt of the summ ry is for both oper ting nd servicing

personnel. Specific w rnings nd c utions will be found throughout the m nu l where they

pply, but m y not ppe r in this summ ry.

TERMS

In This M nu l

CAUTION st tements identify conditions or pr ctices th t could result in d m ge to the

equipment or other property.

WARNING st tements identify conditions or pr ctices th t could result in person l injury or

loss of life.

As M rked on Equipment

CAUTION indic tes person l injury h z rd not immedi tely ccessible s one re ds the

m rking, or h z rd to property including the equipment itself.

DANGER indic tes person l injury h z rd immedi tely ccessible s one re ds the m rking.

SYMBOLS

In This M nu l

This symbol indic tes where pplic ble c ution ry or other inform tion is to be

found.

As M rked on Equipment

yDANGER — High volt ge.

Protective ground (e rth) termin l.

ATTENTION — refer to m nu l.

Power Source

This product is intended to oper te from power source th t will not pply more th n 250 volts

rms between the supply conductors or between either supply conductor nd ground. A

protective ground connection by w y of the grounding conductor in the power cord is

essenti l for s fe oper tion.