Tektronix 067-0587-01 User manual

Tektronix,

Inc.

P.O.

Box

500

Beaverton,

Oregon

97077

070-1914-00

TEKTROND©

067-0587-01

SIGNAL”

STANDARDIZER

CALIBRATION

FIXTURE

INSTRUCTION

MANUAL

Serial

Number

First

Printing

NOV.

1974

WARRANTY

All

TEKTRONIX

instruments

are

warranted

against

defective

materials

and

workmanship

for

one

year.

Any

questions

with

respect

to

the

warranty

should

be

taken

up

with

your

TEKTRONIX

Field

Engineer

or

representative.

All

requests

for

repairs

and

replacement

parts

should

be

directed

to

the

TEKTRONIX

Field

Office

or

representative

in

your

area.

This

will

assure

you

the

fastest

possible

service.

Please

include

the

instrument

Type

Number

or

Part

Number

and

Serial

Number

with

all

requests

for

parts

or

service.

Specifications

and

price

change

privileges

reserved.

Copyright

©

1974

by

Tektronix,

Inc.,

Beaverton,

Oregon.

Printed

in

the

United

States

of

America.

All

rights

reserved.

Contents

of

this

publication

may

not

be

reproduced

in

any

form

without

permission

of

Tektronix,

Inc.

U.S.A.

and

foreign

TEKTRONIX

products

covered

by

U.S.

and

foreign

patents

and/or

patents

pending.

TEKTRONIX

is

a

registered

trademark

of

Tektronix,

Inc.

_

ne

é

Section

l

Section

2

Section

3

Section

4

Section

5

Section

6

Section

7

TABLE

OF

CONTENTS

Characteristics

Electrical

Mechanical

Environmental

Front

Panel

Controls

and

Connectors

Operating

Instructions

Circuit

Description

Check-Out

and

Calibration

Procedure

Electrical

Parts

List

Schematic

Diagrams

Mechanical

Parts

List

Mechanical

Parts

List

Illustrations

067-0587-01

CALIBRATION

FIXTURE

Signal

Standardizer

‘

/

The

067-0587-01

Calibration

Fixture

is

a

calibration

aid

for

all

7000-series

mainframes.

The

unit

is

designed

to

standardize

all

main-

frames

to

all

7-series

plug-in

units

both

vertical

and

horizontal.

Test

Functions

permit

calibration

of

deflection

factor,

step

response,

DC

shift

of

display

channels,

and

trigger

channels.

Bandwidth

measure-

ments

of

mainframe

alone

can

be

made

by

applying

a

frequency

standard

to

the

CW

IN

connector.

Calibration

of

time

base

units

is

accomplished

by

applying

signal

from

time-mark

generator

to

the

AUX

IN

connector.

‘

>

Characteristics

VERT

or

HORIZ

Mode

STEP

RESPONSE

Risetime

Amplitude

GAIN

Steps

Accuracy

FREQUENCY

RESPONSE

(CW

IN)

Response

Input

Impedance

Auxiliary

Input

(AUX

IN)

Input

Impedance

REPETITION

RATE

Accuracy

TRIGGERING

Mode

STEP

PRSPONSE

Risetime

Amplitude

GAIN

Steps

Accuracy

ELECTRICAL

SECTION

1

067-0587-01

CHARACTERISTICS

Performance

Requirement

300

ps

or

less

into

display

channel

At

least

8

div

of

display

with

AMPLITUDE

control

fully

cw

Within

0.34

with

no

+50

V,

supply

error

Leveled

from

3

MHz

to

500

MHz

sinewave

input.

50

2

R50

2

Within

20%

of

rate

selected

300

ps

or

less

into

trigger

channel

At

least

8

div

of

display

with

AMPLITUDE

control

fully

cw

Within

0.3%

1-1

Characteristics

067-0587-01

ELECTRICAL

FREQUENCY

RESPONSE

(CW

IN)

Response.

Input

Impedance

REPETITION

RATE

Accuracy

(cont)

Leveled

3

MHz

to

500

MHz

sine-

wave

input

50

2

within

20%

of

rate

selected

Characteristics

Overall

Dimensions

Height

Width

Depth

Weight

Characteristics

Temperature

Operating

Range

Warmup

Time

MECHANICAL

Requirement

_,

#5

inches

w

2-5/8

inches

~14-1/8

inches

~*~

1

pound

ENVIRONMENTAL

Requirement

5

minutes

at

25°C

Characteristics

067-0587-01

Supplemental

Information

Supplemental

Information

Calibrated

at

20°C

30°C

Characteristics

067-0587-00

FRONT

PANEL

CONTROLS

AND

CONNECTORS

AMPLITUDE

Adjusts

amplitude

of

signal

applied

to

AUX

IN

and

CW IN

connector

as

well

as

the

amplitude

of

the

VERT

or

HORZ

Step

Response

and

TRIGGERING

Step

Response.

POSITION

Control

Positions

display

vertically

or

horizontally.

CW

LEVELED

Indicator

When

lit,

indicates

that

a

constant

amplitude

signal

is

applied

to

the

signal

out

or

trigger

out

while

in

FREQ

RESP

mode.

TEST

Switch

VERT

OR

HORIZ

AUX

IN

Displays

signal

applied

to

AUX

IN

connector.

FREQ

RESP

Displays

signal

applied

to

CW

IN

connector.

-

STEP

RESP

Displays

negative-going

step.

+

STEP

RESP

Displays

positive-going

step.

GAIN

Applies

staircase

waveform

to

signal

channel.

COM

MODE

Applies

the

signal

from

the

COM

MODE

connector

to

both

the

+

signal

out

and

—-

signal

out.

TRIGGERING

GAIN

Applies

staircase

waveform

to

trigger

channel.

+

STEP

RESP

Applies

a

positive-going

step

to

trigger

channel.

1-4

Characteristics

067-0587-00

FRONT

PANEL

CONTROLS

AND

CONNECTORS

(cont)

-STEP

RESP

Applies

a

negative-going

step

to

trigger

channel.

FREQ

RESP

Applies

signal

from

CW IN

connector

to

trigger

channel.

REP

RATE

Selects

repetition

rate

for

VERT

or

HORZ

and

TRIGGERING

Step

Response,

also

selects

the

repetition

rate

for

the

staircase

waveform

produced

in

the

GAIN

position.

TRIG

OUT

Connector

Provides

a

trigger

signal

that

is

matched

to

the

VERT

or

HORZ

and

TRIGGERING

Step

Response.

SECTION

2

067-0587-01

OPERATING

INSTRUCTIONS

The

following procedure

describes

the

basic

functions

of

the

Signal

Standardizer

when

operated

in

a

7000-Series

Oscilloscope.

Detailed

information

for

calibrating

or

testing

the

oscilloscope

is

described

in

the

Instruction

Manual

supplied

with

the

Instrument.

The

Signal

Standardizer

is

installed

in

one

of

the

vertical

or

horizontal

compartments

of

the

oscilloscope.

To

measure

the

step

response

of

the

diplay

channel

or

trigger

channel,

the

TEST

switch

is

set

at

the

appropriate

STEP

RESP

position,

+

or

-

polarity.

In

this

mode

of

operation,

a

pulser

circuit

contained

within

the

Signal

Standardizer

provides

a

series

of

fast-rise

pulses

for

checking

the

risetime

of

the

selected

compartment.

An

AMPLITUDE

control

adjusts

the

display

size

and

pushbuttons

select

the REP

RATE

desired.

When

the

TEST

switch

is

in

one

of

the

GAIN

positions,

the

Signal

Standardizer

generates

a

series

of

amplitude

steps

for

checking

the

gain

of

the

display

channels

or

trigger

channel.

At

slow

sweep

speeds,

with

the

time-base

triggering

set

to

free-fun.

the

gain

steps

appear

as

solid

lines

across

the

screen,

The

position

of

these

lines,

in

relation-

ship

to

the

graticule

lines,

is

used

to

denote

the

gain.

The

lines

are

also

used

to

check

or

set

either

vertical

or

horizontal

linearity

and

geometry.

The

REP

RATE

of

the

gain-step

signal

can

be

selected,

however

the

fastest

rate

is

used

for

most

applications.

The

FREQ RESP

positions

of

the

TEST

switch

are

used

to

measure

the

frequency

response

of

the

display

channels

or

trigger

channel.

In

this

mode

of

operation,

external sinewaves

are

applied

at

the

CW

IN

connector:

2-1

Operating

Instructions

067-0587-01

2-2

An

internal

amplifier

limits

the

CW

In

signal

to

provide

a

constant

amplitude

output.

This

circuit

is

operating

properly

when

the

CW

LEVELED

indicator

is

lit.

To

check

frequency

response

procede

as

follows:

1.

Rotate

AMPLITUDE

control

fully

clockwise.

2.

Connect

a

sinewave

generator

to

the

CW

IN

connector

and

set

it

to

the

reference

frequency

specified

in

the

oscilloscope

mainframe

manual.

3.

Set

TEST

switch

to

FREQ

RESP

and

adjust

sinewave

generator

for

a

CRT

display

of

approximately

10

divisions

(approximately

0.5

V,

P-P)

4.

Rotate

the

AMPLITUDE

control

counterclockwise

to

obtain

the

desired

display

amplitude.

The

CW

LEVELED

indicator

should

be

lit.

|

3.

Proceed

with

frequency

response

check.

If

CW

LEVELED

indicator

goes

off,

increase

amplitude

of

the

sinewave

generator

until

light

just

comes

on.

The

AUX

IN

position

of

the

TEST

switch

is

used

to

check

horizontal

timing

and

linearity

of

the

oscilloscope.

The

Signal

Standardizer

is

installed

in

a

vertical

compartment,

and

a

time-base

unit

installed

in

a

horizontal

compartment,

of

the

oscilloscope.

A

Time-Mark

Generator

such

as

a

Tektronix

Type

184

or

2901

is

connected

to

the

AUX

IN

connector.

The

COM

MODE

switch

position

connects

the

signal

applied

to

the

COM

MODE

connector

to

the

+

signal

and

-

signal

lines

through

50

2

resistors.

SECTION

3

067-0587-01

CIRCUIT

DESCRIPTION

Clock

Generator

The

clock

generator

consists

of

an

astable

multivibrator,

two

buffers

and

switchable

timing

capacitors.

The

frequency

of

the

multivibrator,

Q134

and

Q140,

is

selected

by

switching

one

of

five

emitter

coupled

timing

capacitors

into

the

circuit.

This

is

done

by

the

REP

RATE

switch,

S150.

External

TRIG

OUT

is

coupled

directly

from

the

multivibrator

to

the

front

panel

connector.

Buffer

Q118

provides

a

clock

signal

to

the

Trigger

Amplifier

and

Staircase

Generator

The

output

of

buffer

Q122

passes

thru

a

differentiating

circuit

consisting

of

R124

and

C125.

The

output

of

the

differentiator

is

used

as

a

trigger

for

the

Pulse

Generator.

Trigger

Amplifier

The

Trigger

Amplifier

provides

the

oscilloscope

mainframe

with

a

triggering

signal

which

in

turn

is

uded

in

the

horizontal

time

base

amplifier.

The

circuit

consists

of

the

Clock

Generator

signal

and

‘two

transistor

switches,

Q164

and

Q170.

A

positive

transition

at

the

base

of

Q164

causes

a

negative

transition

at

the

collector

of

Q164

and

a

positive

transition

at

the

collector

of

Q170.

The

switching

level

of

Q170

and

Q164

is

controlled

by

R176.

R176,

therefore,

is

effectively

a

delaying

control

which

is

used

to

match

the

trigger

output

signal

with

the

fast

rise

pulse

from

the

Pulse

Generator.

Fulse

Generator

The

pulse

generator

consists

of

a

number

of

current

switches

that

are

controlled

by

the

tunnel

diode

CR280.

A

positive

pulse

from

the

Clock

Generator

causes

CR280

to

turn

on.

This

causes

Q282

to

turn

on

shutting

Q292

off.

This

turns

the

complementary

transistor

switches

Q296

and

Q298

on

which

reverse

biases

the

diconnect

diodes

CR300,

CR301,

CR395

and

CR306.

The

complementary

transistor

switches

Q310

and

Q312,turn

off the

diconnect

diodes

CR318,

CR320,

CR323,

and

CR325

therefore,

removing

the

minus

voltage

from

R326

and

the

positive

voltage

from

R321.

The

amplitude

of

this

voltage

is

set

by

the

AMPLITUDE

control.

R314

is

a

balance

control

used

mainly

to

correct

for

tracking

errors

in

the

AMPLITUDE

control.

Circuit

Description

067-0587-01

Pulse

Generator

(cont)

R314

is

normally

adjusted

to

obtain

equal

amplitude

plus

and

minus

output

pulses

(with

each

pulse

set

to

approximately

2.5

div).

A

negative

going

pulse

from

the

Clock

Generator

turns

the

tunnel

diode

off

again

returning

the

transistor

switches

to

their

original

states.

C319

and

C324

are

both

adjusted

to

obtain

a

square

front

corner

on

the

rising

portion

of

the

output

pulse.

Stair

Case

Generator

The

Stair

Case

Generator

consists

of

a

series

of

logic

switched

current

generators,

decoding

logic,

and

a

sequencing

generator.

Sequencing

Generator

The

Sequencing

Generator

is

a

Binary

Coded

decimal decoder

(U185)

driven

by

a

4

bit

counter,

V180.

A

continuous

train

of

pulses

is

supplied

from

the

Clock

Generator

to

the

input

of

U180.

These

pulses

allow

the

counter

to

cycle

through

a

count

of

0

to

15

ata

rate

determined

by

the

REP

RATE

switch

setting.

The

BCD

4

line

output

of

U180

is

connected

to

the

input

of

the

4

line

to

16

line

decoder,

U185.

The

logic

levels

of

the

16

output

lines

are

therefore

sequenced

in

order

from

0

to

15.

Decoding

Logic

Ten

of

the

sixteen

output

lines

are

connected

to

the

decoding

logic

circuitry,

U190A,B

and

U195A,B,C,D.

The

decoding

logic

provides

logic

levels

for

switching

a

pair

of

current

generators

or

several

pairs

of

current

generatofs,

Six

of

the

sixteen

output

lines

are

not

connected

to

provide.

spaces

between

the

positive

going

staircase

and

negative

going

staircase.

Logic

Switched

Current

Generator

There

are

basically

two

types

of

logic

switched

current

generators

used

in

this

instrument.

These

are the

positive

current

generator

and

negative

current

generator.

An

example

of

a

positive

current

generator

is

CR200,

CR202,

CR204,

R201

and

R203.

By

applying

a

logical

low

to

CR200,

CR202

will

be

forward

biased

and

CR204

will

be

reversed

biased,

therefore

turning

the

current

generator

off.

By

applying

a

logical

high

to

CR200,

CR202

will

be

clamped

off

allowing

current

to

flow

through

CR204.

The

amount

of

current

is

limited

by

precision

resistor

R203.

.

Circuit

Description

067-0587-01

Logic

Switched

Current

Generator

(cont)

An

example

of

a

negative

current

generator

is

U200E,

CR266,

CR268,

CR270

and

R296.

A

logical

low

applied

to

U200E

causes

CR266

and

CR268

to

turn

on

foreing

CR270

off

which

effectively

turns

the

current

generator

off.

A

logical

high

into

U200E

causes

the

cathode

of

CR266

to

drop

thus

clamping

CR268

off

which

in

turn

allows

current

to

flow

through

CR270.

With

the

TEST

switch

in

the

GAIN

position,

the

current

generators

are

connected

to

the

oscilloscope's

trigger

or

signal

input.

These

inputs

have

an

input

resistance

of

50

ohms

to

ground,

therefore,

the

voltage

produced

across

the

50

ohm

resistor

is

directly

the

current

through

it.

CW

Leveled

The

single

ended

signal

applied

to

the

AUX

IN,

CW IN

connector

is

connected

to

a

high

frequency

push-pull

amplifier

U30..

Minimum

gain

is

set

by

R31.

R31

is

set

so

that

a

10

division

input

signal

will

produce

approximately

a

2

division

display

when

the

AMPLITUDE

control

is

fully

counterclockwise.

The

signal

from

U30

is

connected

through

T60

to

the

differential

amplifier

Q64 and

Q74.

The

output

of

this

amplifier

is

connected

to

the

TEST

switch

to

await

mode

selection.

The

relative

DC

level

(position)

of

this

signal

is

controlled

by

the

voltage

dividers

formed

by

R335A,

and

R335B.

In

the

FREQ RESP

mode

the

gain

of

U30

is

controlled

by

the

automatic

leveling

circuit.

CR80,

C81,

CR84

and C83

form

a

peak

to

peak

detector

giving

a

DC

representation

of

the

output

signal

amplitude.

The

output

of

the

peak

to

peak

detector

is

connected

to

a

comparator

amplifier,

U94,

through

the

balanced

to

single

ended

converter,

U90.

A

DC

level

corresponding

to

the

desired

signal output

is

set

at

the

input

of

the

comparator

amplifier

by

the

Amplitude

Control,

R330B.

The

resultant

output

of

the

comparator

amplifier

is

connected

to

U30

to

control

the

gain.

This

output

is

also

connected

to

the

leveling

light

circuit

Q98

and

Q102.

R25

provides

DC

balance

and

is

adjusted

for

minimum

trace

shift

while

varying

the

input

signal

from

approximately

0.3

volts

peak

to

peak

to

approximately

0.7

volts

peak

to

peak

(CW

LEVELED

light

should

be

lit).

Trigger

Piekoff

Triggering

for

the

mainframe

is

provided

by

the

differential

amplifier,

Q42

and

Q52.

The

relative

DC

level

position

of

the

trigger

signal

is

controlled

by

the

voltage

dividers

R335A

and

R335B.

3-3

SECTION

4

067-0587-01

CHECK-OUT

AND

CALIBRATION

PROCEDURE

Introduction

This

procedure

is

intended

to

be

used

as

a

basic

operational

check

for

the

Tektronix

067-0587-01

Calibration

Fixture.

The

test

equipment

required

for

this

procedure

would

normally

be

found

on

a

test

bench

where

this

instrument

would

be

used.

Preliminary

Instructions

Insert

the

067-0587-01

into

a

vertical

compartment

of

a

Tektronix

7000-series

oscilloscope

that

is

known

to

be

working

properly.

Insert

a

7B-series

time-base

plug-in

into

a

horizontal

compartment

and

set the

time-base

for

0.2

microsecond/division,

autotriggered.

Set

the

oscilloscope

to

display

the

outputs

of

the

067-0587-01

and

the

time-base

plug-in.

Common

Mode

1.

Connect

a

3

to

5

MHz.

signallto

the

AUX

IN,

CW

IN

connector

and

set

the

TEST

switch

to

AUX

IN.

2.

Set

the

AMPLITUDE

control

fully

clockwise

and

adjust

the

signal-

generator

amplitude

for

eight

divisons

of

display

amplitude

(approximately

400

millivolts.,

peak-to-peak).

lany

sine-wave

generator

capable

of

producing

a

300

to

500

millivolt

variable

signal

output

3

to

5

MHz.

is

suitable

for

use

with

this

procedure.

CALIBRATION

PROCEDURE

067-0587-01

3.

Remove

the

signal

from

the

AUX

IN

connector

and

connect

it

to

the

COM

MODE

connector.

4.

Set

the

TEST

switch

to

COM

MODE.

5.

Check

for

less

than

0.4

division

of

display

amplitude.

6.

Remove

the

signal

from

the

COM

MODE

connector.

Gain

1.

Set

the

REP

RATE

switch

to

1

MHz.

2.

Set

the

TEST

switch

to

GAIN.

3.

Check

that

nine

lines

are

displayed

on

the

crt,

approximately

one

division

apart.

Step

Response

1.

Set

the

TEST

switch

to

+

STEP

RESP.

2.

Set

the

AMPLITUDE

control

fully

counterclockwise.

3.

Position

the

trace

to

the

center

of

the

graticule

line

with

the

POSITION

control.

4.

Set

the

AMPLITUDE

control

for

three

divisions

of

display

ampli-

tude.

5.

Set

the

TEST

switch

to

-

STEP

RESP

and

check

for

approximately

three

divisons

of

display

amplitude.

|

6.

Set

the

POSITION

control

to

position

the

bottom

of

the

display

to

the

bottom

graticule

line.

7.

Check

that

at

least

eight

divisons

of

display

amplitude

can

be

obtained

with

the

AMPLITUDE

control.

CALIBRATION

PROCEDURE

067-0587-01

8.

Check

that

the

frequency,

as

selected

by

the

REP

RATE

switch,

is

within

20%.

9.

Connect

a

cable

(or

Xl

probe)

from

the

TRIG

OUT

connector

to

the

time-base

Ext

Trig

In

connector.

10.

Set

the

time—base

triggering

to

Ext

Source.

11.

Check

that

the

time-base

can

be

triggered

from

the

TRIG

OUT

signal.

12.

Set

the

time-base

triggering

to

Int

Source.

13.

Remove

the

cable

from

the

TRIG

OUT

connector.

Frequency

Response

1.

Connect

a

3

to

5

MHz.

signal

to

the

AUX

IN,

CW

IN

connector.

2.

Set

the

AMPLITUDE

control

fully

clockwise

and

adjust

the

signal-

generator

amplitude

for

10

divisions

of

display

amplitude

(approximately

500

millivolts,

peak-to-peak).

|

3.

Set

the

AMPLITUDE

control

for

eight

divisions

of

display

amplitude

and

check

that

the

CW

LEVELED

light

is

on.

4.

Set the

AMPLITUDE

control

for

five

divisions

of

display

amplitude

and

check

that

the

CW

LEVELED

light

is

on.

Auxiliary

Input

1.

Set

the

TEST

switch

to

AUX

IN.

2.

With

the

signal

still

applied

to

the

AUX

IN,

CW

IN

connector,

check

that

approximately

eight

divisons

of

display

amplitude

can

be

obtained

with

the

AMPLITUDE

control

fully

clockwise.

Triggering

|

1.

Set

the

time-base

triggering

for

Norm

Mode.

CALIBRATION

PROCEDURE

067-0587-01

2.

With

the

signal

still

applied

to

the

AUX

IN,

CW

IN

connector,

check

that

the

time-base

can

be

triggered

(trace

displayed

on

the

crt)

in

all

TRIG-

GERING

positions

of

the

TEST

switch.

Remove

the

signal

connection

from

the

067-0587-01.

Tektronix 067-0587-01 User manual

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