Tektronix 177 Instruction Manual

177 STANDARD

TEST FIXTURE

SERVICE

WARNING

COMMITTED

m EXCELLENCE

THE ARE FOR USE BY QUALI TO PERFORM ANY SERVI CONTAINED

UNLESS YOU

FOLLOWING SERVICING INSTRUCTIONS

AVOID PERSONAL INJURY, DO

CI IN OPERATING INSTRUCTIONS ARE QUALI

PLEASE CHECK FOR CHANGE INFORMATION AT

FI

ED

PERSONNEL ONLY.

NOT

NG OTHER

FI

ED

THAN

TO DO

THAT

SO.

THE REAR OF THIS MANUAL.

Tektronix, P.O. Beaverton,

070-1472-00

Product Group 48

Box

Inc.

500

Oregon

97077

177 STANDARD

TEST FIXTURE

SERVICE

INSTRUCTION

Serial

Number

MANUAL

_____

First Printing JUL 1973 Revised JUN 1983

_

Copyright ® Contents of this form without the written permission of Tektronix,

1973

Tektronix,

publication may not

Inc.

All

rights reserved.

be

reproduced

Inc.

in

any

Products of Tektronix, by U.S.

TEKTRONIX, registered trademarks of Tektronix, is

Printed are reserved.

Each or stamped deSignates the country of manufacture. of the unique to United States have six unique digits. The country of manufacture

and

foreign patents and/or pending patents.

TEK,

a registered trademark of Tektronix

in

U.S.A. Specification

INSTRUMENT SERIAL NUMBERS

instrument has a serial number

on

serial number are assigned sequentially and are

each

is

identified

Inc.

and

its subsidiaries are covered

SCOPE-MOBILE,

and

the chassis. The first number or letter

instrument. Those manufactured

as

follows:

and

Inc.

U.K.

price change privileges

on

~

TELEQUIPMENT

Limited.

a

pa~el

insert, tag,

The

last five digits

in

are

the

BOOOOOO

100000

200000 300000 700000

Tektronix, Inc., Beaverton, Oregon, USA Tektronix Guernsey, Ltd., Tektronix United Kingdom, Ltd., London Sony/Tektronix, Japan Tektronix

The

Holland,

Netherlands

NV,

Channel Islands

Heerenveen,

177 Service

SECTION 1

SECTION 2

SECTION 3

SECTION 4

SECTION 5

TABLE

SPECI

FICATION

Electrical Characteristics

Display

OPERATING Introduction

Preliminary Controls

CIRCUIT DESCRIPTION Introduction

Description

MAINTENANCE

Introduction

Preventive Maintenance

General Cleaning Lubrication Visual Inspection Transistors Recalibration 4-2

Troubleshooting

Introduction Troubleshooting Equipment 4-2 Troubleshooting Aids 4-2

Component Removal and Replacement

Removal Replacement Removal Repackaging

CHECK

Amplifier

of

AND

OF

INFORMATION

and

Integrated Circuits 4-2

the

VERTICAL

of

the

I ndicator Lamps

for

Shipment

ADJUSTMENT PROCEDURE

CONTENTS

CURRENT!DIV

VERTICAL

CURRENT!DIV

Switch 4-3

Switch 4-5

Page

1-1

2-1 2-1 2-1

3-1 3-1

4-1

4-1 4-1 4-1 4-1

4-2

4-5 4-5

REV.

B.

MAY. 1977

SECTION 6

SECTION 7

SECTION 8

CHANGE

INFORMATION

Introduction Services Available Test Equipment Required

Performance Check Adjustment Procedure

ELECTRICAL

DIAGRAMS

Symbols and Reference Designators Voltage and Waveform Test Conditions Circuit Board

Diagrams

MECHANICAL

PARTS LIST

Illustrations

PARTS LIST

AND

ILLUSTRATIONS

5-1 5-1 5-1 5-1

5-4

177

Standard

Tes

t

Fixture.

177 Service

®

SPECIFICATION

The

177

is

a plug-in test fixture designed

the

577

-D

1 or

D2

Curve Tracer

measure the characteristics of a variety of two, three, and

four term ina

The

I devices.

177 features:

to

operate with

to

form a system

to

Section

The 100 V, normally interlocked and are energized by closing protective box cover

button.

Only those voltages

for Emitter-Base Leakage

400

V, and 1600 V collector ranges are

or

by pushing the interlock

that

are

not

interlocked are available

or

Breakdown tests.

1-177

Service

the

defeat

Two switch-selected sets

parison tests.

to

Kelvin sensing

current

the various

2 A/DIV.

step generator emitter

compensation control.

levels.

A term inal selector switch

test

Vertical deflection factors ranging from

External front-panel jacks permitting access

(E) terminals.

A variable

provide accurate measurements at high

configurations.

output

-12,

0,

of

test jacks, perm itting com-

that

perm its easy selection of

and device-under-test base

+12 volt

DC

output

0.2 nA/DIV

to

the 577

(B)

and

and a looping

to

The

electrical and environmental characteristics shown are valid for instruments operated ture

range from +1O°C (+50°F) five-minute warmup, +30°C (+86°F).

E

lECTR

Display

Amplifier

Accuracy (percent of highest on-screen value)

Vertical Collector Current: Total system accuracy of the

577-177-D1

magnified.

Deflection Factor, Vertical

Collector Current: 2 sequence, unmagnified, and DIV, magnified.

if

calibrated

ICAl

CHARACTER ISTICS

or

D2

nA/DIV

in

an ambient tempera-

to

+40°C (104°F) after a

at

+20°C (+68°F)

is

3%, unmagnified, and 4%,

to

2 AlDIV

0.2 nA/DIV

in

to

a 1-2-5

200

mAl

to

®

1-1

Section

2-177

Service

OPERATING

Introduction

The

177 Test Fixture operates with a Tektronix 577

the

D1

or

D2

Curve Tracer and

of

1 or

of

the

front·panel controls of

D2

This section description 577 -177 operating procedure.

-D

the

Operators Manual for a complete

Display

manual gives a brief functional

Preliminary

For initial preparation, refer

tions

section of

The

Operators Manual contains operating instructions,

well

as

general and specific application information.

the

577-177-D1 or D2 Operators Manual.

Unit

the

to

the

Operating Instruc-

as a system.

177. See

INFORMATION

BASE GROUNDED MODE (Base terminal

polarity

Disconnects

generator

minal INPUT Connector.

Applies step generator terminal.

to

the

to

that

output

the

base term

the

are

the

as

step generator is

switched as follows):

EM

ITTER TERM

OPEN (OR EXT)

STEP GEN

EMITTER-BASE BREAKDOWN

Grounds

sweep voltage

voltage

ranges

is

inverted, and

the

emitter

and connects

front-panel EXT BASE OR

inal

emitter terminal. Only

not

interlocked are available.

the

em itter term inal

term inal from

the

output

and applies

to

emitter ter-

the

grounded,

the

step

EM

IT

em itter

collector

collector·

Controls

This

is

a brief description of front-panel controls. More detailed information is given the

Operators Manual.

EMITTER GROUNDED MODE grounded; Base terminal

BASE TERM

STEP GEN

Applies step generator tions

of

OPEN (OR EXT)

Disconnects generator the

front-panel EXT

Connector.

SHORT

Disconnects

generator

the

output

is

switched as follows):

test

fixture.

the

base terminal from

and connects base terminal

the

base terminal from

and grounds

the

functions of

(Emitter terminal

output

BASE

to

the

OR

the

base term inal.

base connec·

the

EM

IT

INPUT

the

in

is

step

to

step

STEP GEN OUTPUT Connector

Provides

EXT

Provides

depending

GROUND

Provides for external ground connection.

LEFT-RIGHT Switch

Three position either center position disconnects all terminals

term ina together and are connected generator, or

position of

Test Adapter

Two sets

for testing various sem icond uctor devices.

external access

BASE

OR

external access

on

the

left

Is.

The

the

of

to

the

step generator

EM

IT

IN

Connector

to

the

base or em itter

the

position of

toggle switch for applying

or

right set of terminal connectors.

em itter term inals are always connected

to

the

Terminal Selector switch.

Terminal Jacks

five recessed jacks accepting various adapters

the

Terminal Selector switch.

to

either ground,

collector sweep depending

test

except

output.

term

signals

the

emitter

to

the

on

ina

The

step

the

Is,

to

®

2-1

Section

3-171

Service

CIRCUIT

DESCRIPTION

Introduction

This section of the manual contains a description of the circuitry schematic diagrams, with values, are shown on manual.

in

the 177 Standard Test Fixture. Complete

component

the

pullout pages at

numbers and parts

the

rear

of

this

Description

The

Standard plifier (variable gain) current-sensing resistor.

The

entire vertical preamplifier, including its power

supply, floats with respect

The

vertical preamplifier consists followers, fier, U616, and an inverting feedback amplifier, U6240626-0628, switching. 577 vertical amplifier.

Current connected between under test.

Test

Fixture contains

that

to

0604A

The

and

B;

a non-inverting feedback ampli-

which provides

inverting amplifier

sensing resistors, R

the

collector supply and

the

vertical pream-

measures voltage across a

ground. See Fig. 3-1.

of

two FET source

the

1-2-5 current per division

output

630

connects

through R636, are

the

to

device

the

for

the

stray capacitance across tors, keeping of

the

U616

R618-R619. This divider horizontal VERTICAL CURRENT/DIV switch 2 mA/DIV). This voltage same test. This method permits monitoring without resistor.

On the high-current ranges horizontal sense terminal of sensing. If Kelvin sensing between attenuator

U616

U624-0626-0628.

feedback resistance

(gain of R627

the

time

constant

stray capacitance and R630 through R636.

output

attenuator

as

the

drawing

attenuator

C and C SENSE terminals connects

to

output

5L

in

parallel with R629 (gain

is

connected

in

to

voltage on

the C term

R627 and R628

the

current

is

connected directly

the

device under

ina

is

connected

The

input

is

composed of three resistors, R627

the

current sensing resis-

sim ilar

to

output

the

collector of

through

is

Is.

is

low-current ranges

horizontal

(5

mA/DIV

test

not

used,

to

the

resistance

in

parallel (gain of

of

1).

to

the

time

constant

a 10: 1 divider,

connected

(2

attenuator

the

collector voltage

the

current-sensing

to

the

inverting amplifier,

is

R621 and

to of

nA/DIV

is

device under

2 A/DIV)

the

collector

permit Kelvin

22.Q

resistor

the

horizontal

2.5L

and

the the

to

the

0604A the puts are fed

R612

(Gain Adj) make up for source-follower

C632, LOOPING COMPENSATION (front-panel troll. the capacitance.

C630 and R660 through R665 (ganged with current-sensing resistors, R630 through R636), compensate

REV.

and B (source followers) are connected across

current-sensing resistors, and

differentially

is

the

input

slightly more than 10,

losses.

compensates for stray capacitance

test

adapter, as well as some

B,

MAR.

1975

to U 616,

resistor for U616; R616 and R615

the

feedback resistor.

the

source-follower out-

the

X 1 0 ampl ifier.

to

compensate for

at

of

the

0604B

device-under-test

The

gain

the

gate and

is

FET

con-

the

set

The inverting

to

21

P129.

prevent signal load

0-15-volt the resistors.

ranges of and 1600 placed over is permits these three ranges

0626-0628

All

power

junction

When using

depressed. When

amplifier,

of

J110,

to

provide low-output impedance

ing

by

is

supplied by

supplies. 0 (test fixture common)

of

the

collector supply and

the

177

the

MAX

PEAK VOLTS switch

V)

are

not

enabled unless

the

test

adapter

the

U624-0626-0628,

the

vertical amplifier via pin 4

the

Test

cover

to

chopper

Fixture

or

be

the

interlock

is

closed,

enabled.

circu it.

floating 0+15 and

is

the

current

in

the

577,

(100V,

the

protective cover

S626

is

connected

sensing

the

highest 400

defeat

button

is

closed and

of to

to

V,

is

3-1

::II

m

<

.tIl

s::

»

::0

VERTICAL

CURRENTI

DIV

DEVICE C

(")

~'

;:+'

COLLECTOR SUPPL Y

FROM 577

____________

Jll0

C630

,

I

r---

I

,

I

I L_

R636

THROUGH

R613

R630

J¥+15

R612

.6'-15

R615

and

GAIN

.Il'+15

.6'-15

R616

R618

i":-C------------------------------~H~I~G;H~C~U~R~R;E~N~T--------------~04~>-------

r--

.l...

T B I

L__

DEVICE UNDER TEST I

(5mAto2A)

1___

24

-----

R619

R621

CURRENT

LOW

A

""iiii---------------------------'

J¥+15

.6'-15

R629

-.,

X5

I

R6Z8

______

R627

.6'+15

,

X2.5

r-

..J

I

Xl

~--~~----~--------------:2~1~1~~t.~VE:ri~:~T~~~~AL

U624,0626

0628

,d-15

L---------------:.6'~=~V~E:R:T~~IC~A~L~S~I~G~N~A~L~C-O~M-M--O-N----~2~2~.~~~~

(2

nA

- 2 rnA)

______________________________________________

I

I I

~,>---,,--..,

I

i SUPPLY

~

I

;>--Jr--f-_-.J

I

I I

I

I I

I

I I

,

I I

I

~A~1'~

I~

Jll0

I

F~~~~~G

AMPLIFIER

• .6'

TO

HORIZONTAL

ATTENUATOR

o

~

...

ii'

...

0'

;:,

I

...

"-I "-I

~

<

~'

5628,

the

177

interlock_

the

safety-interlock

front

panel) may be pressed

defeat

switch (red

to

defeat

button the

safety

on

Circuit

WARNING

Oescription-177

I

Service

The using option

100

V and

the

protective cover

in

the

177 (see Fig. 3-2

400

V supplies may be enabled

or

the

defeat

for

details).

switch

by

without a wiring

To the between

enable

Interlock

point

enable

Interlock

point B and

This modification

supply can

likely lethal. ING note should

the

+l00·volt

Defeat A and

+400-volt Defeat

switch,

point

switch.

point

supply

is

not

be

lethal and the

If

this modification

be

permanently attached to the

without

remove link A

X.

without

remove link B and

X.

using

recommended. The 100 V

400

V supply

is

made a WARN-

is

very

177.

the

protective

and

connect a wire

the

protective

connect

box

or

box

of

a wire

®

Fig.

3-2.

100 V and

400 V Interlock

Defeat

bypass

option.

3-3

Tektronix 177 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual