Tektronix 7A19 User manual

Pod

TEKTROND©

INSTRUCTION

MANUAL

)

Tektronix,

Inc.

P.O.

Box

500

Beaverton,

Oregon

97077

Serial

Number

070-2129-00

First

Printing

MAY

1976

SECTION

TABLE

CONTENTS

SPECIFICATION

Introduction

Option

OPERATING

INSTRUCTIONS

Front

Panel

Controls

and

Connectors

Operating

Instructions

and

Checkout

Applications

CIRCUIT

DESCRIPTION

Block

Diagram

Detailed

Circuit

Description

MAINTENANCE

Preventive

Maintenance

Troubleshooting

Corrective

Maintenance

CALIBRATION

Performance

Check

Test

Equipment

Required

Calibration

Procedure

Index

Calibration

Procedure

ELECTRICAL

PARTS

LIST

DIAGRAMS

Circuit

Board

Illustrations

Semiconductor

Electrode

Configurations

MECHANICAL

PARTS

LIST

Exploded

View

Drawing

CHANGE

INFORMATION

Page

1-1

2-1

2-2

3-1

4-1

4-3

5-1

5.3

5-4

7A19

Fig.

1-1.

7A19

Amplifier

plug-in

(Left)

and

7A19

with

Variable

delay

option

(Right).

REV.

AUG.

1976

Section

1-7A19

SPECIFICATION

Introduction

The

7A19

Amplifier

plug-in

unit

wide

band

amplifier

designed

for

use

with

TEKTRONIX

7000-Series

oscillo-

scopes.

Readout

encoding

circuitry

provided

the

7A19

allow

probe

coding,

deflection

factor

readout,

and

IDENTIFY

functions.

The

7A19

can

operated

any

compartment

the

7000-Series

oscilloscopes,

but

pri-

marily

intended

for

use

the

vertical

plug-in

compartments.

The

following

electrical

characteristics

are

valid

over

the

stated

environmental

range

for

instruments

calibrated

ambient

temperature

+20°C

+30°C,

and

after

five

minute

warmup

unless

otherwise

noted.

Option

optional

VARIABLE

DELAY

may

ordered

with

TABLE

1-1

ELECTRICAL

the

7A19

provide

signal

delay

+500

ps.

Characteristic

Performance

Requirement

Supplemental

Information

Deflection

Factor

Calibrated

Range

Gain

Ratio

Accuracy

mV/div

V/div,7

steps

ina1,2,5

sequence

Within

with

GAIN

adjusted

mV/div

when

driven

from

ohm

source.

Pre-Charge

circuit

may

used

calibrated

100X

attenuator

Front

panel

GAIN

control

allows

calibra-

tion

mainframe.

Frequency

Response

divi-

sion

reference,

mainframe

dependent)

Upper

Bandwidth

coupled

mV/div

V/div

Lower

Bandwidth

Coupled

With

7400,

MHz;

With

7500,

100

MHz;

With 7700, 175

MHz;

With

7900,

500

MHz

kHz

less

Maximum

Input

Power

coupled

Voltage

(AC

coupled)

watts

average

divisions

peak

deflection.

100

volts

(DC

peak

AC)

not

exceed

watts

average

divisions

peak.

CAUTION

Pre-charge

circuit

must

used

for

both

charging

and

discharging

coupling

capacitor

potentials

greater

than

divisions

equivalent

voltage.

Input

Impedance

Resistance

(DC

GND)

Reflection

Coefficient

(Time

Domain)

ohms

ohm

Less

than

0.1

peak

VSWR

typically

less

than

1.25

500

MHz

Maximum

Input

Current

Less

than

0.2

REV.

SEPT.

1977

Specifications—7A19

TABLE

1-1

(cont)

Characteristic

Performance

Requirement

Supplemental

Information

IDENTIFY

Deflects

trace

approximately

0.3

division

Trace

Positioning

least

divisions

Display

Noise

(Tangentially

Measured)

Less

than

0.1

division

Drift

with

ambient

temperature

(line

voltage

constant)

100

uV/C°

less

Variable

Delay

(Option

Range

Variable

from

—0.5

+0.5

Accuracy

within

+0.05

dial

setting

Input

Polarity

Front

panel

switch

selects

+UP

INVERT

TABLE

1-2

ENVIRONMENTAL

CHARACTERISTICS

TABLE

1-3

PHYSICAL

Size

Fits

all

7000-Series

plug-in

compartments

Refer

the

specifications

for

the

associated

Weight

oscilloscope.

7A19:

kilograms

2.1

Ibs.

7A19

(option

1):

1.3

kilograms

2.9

Ibs.

1-2

—~

Section

2—7A19

OPERATING

INSTRUCTIONS

General

effectively

use

the

7A19,

the

operation

and

capabilities

the

instrument

must

known.

This

section

describes

front-panel

control

functions,

general

information

signal

input

connections,

and

other

subjects

that

pertain

various

measurement

applications.

Installation

The

7A19

calibrated

and

ready

for

use

received.

can

installed

any

compartment

TEKTRONIX

7000-Series

Oscilloscopes,

but

intended

for

principal

use

vertical

plug-in

compartments.

install,

align

the

upper

and

lower

rails

the

7A19

with

the

oscilloscope

tracks

and

insert

it.

The

front

panel

will

flush

with

the

front

the

oscilloscope

and

the

latch

the

bottom

left

corner

will

place

against

the

front panel

when

the

7A19

fully

inserted.

remove

the

7A19,

pull

the

latch

(inscribed

with

the

unit

identification

‘’“7A19”)

and

the

7A19

will

unlatch.

Continue

pulling

slide

the

7A19

out

the

oscilloscope.

FRONT

PANEL

CONTROLS

AND

CONNECTORS

VOLTS/DIV

Selects

calibrated

deflection

factors

from

10mV/Div

1V/Div;

steps

1-2-5

sequence.

POSITION

Controls

the

position

the

trace.

IDENTIFY

Deflects

the

trace

about

0.3

division

for

trace

identification.

instruments

with

readout,

also

replaces

readout

with

the

word

“IDENTIFY”.

GAIN

Adjustment

Screwdriver

adjustment

permits

calibration

deflection

factor.

POLARITY

Provides

means

inverting

the

display.

+UP:

positive-going

signal

the

INPUT

connector

deflects

the

CRT

display

upward.

INVERT:

positive-going

signal

the

INPUT

connector

deflects

the

CRT

display

downward.

Input

Coupling

Switch

Selects

signal

input

coupling

mode.

AC: The

component

the

signal

coupled

the

amplifier

input

while

the

component

blocked.

GND:

Grounds

the

amplifier

input

while

maintaining

the

same

load for

the

input

signal.

PRE-CHG:

Provides

charge

path

for

the

coupling

capacitor

pre-charge

the

input

circuit

before

switching

the

Input

coupling

switch

AC.

DC:

Both

and

components

of the

signal

are

coupled

the

amplifier

input.

GND:

Grounds

the

amplifier

input

while

maintaining

the

same

load

for

the

input

signal.

INPUT

Connector

Provides

means

for

connecting

signal.

VARIABLE

DELAY

(Option

Delays

the

signal

+500

picoseconds

using

calibrated

turn

dial.

OPERATING

INSTRUCTIONS

and

CHECKOUT

Probes

recommended

for

use

with

the

7A19

are

the

P6056

(10X)

P6057

(100X).

Both

probes

are

compatible

ohm

systems,

and

will

allow

optimum

frequency

response.

These

probes

also

contain

trace

IDENTIFY

and

readout

encoding

functions.

Operating

Instructions—7A19

the

P6201

Probe

used,

one

megohm

input

impedance

may

achieved.

Consult

your

local

TEK-

TRONIX

Field

Engineer

Representative

for

further

information.

Vertical

Gain

Check

and

Adjustment

check

the

gain

the

7A19,

set

the

VOLTS/DIV

switch

and

connect

into

{2,

kHz

signal

from

the

oscilloscope

Calibrator

the

INPUT

connector.

The

vertical

deflection

should

exactly

two

divisions.

not,

adjust

the

front

panel

GAIN

control

for

exactly

two

vertical

divisions.

Input

Coupling

The

input

coupling

switch

allows

choice

input

coupling

methods.

The

type

display

desired

and

the

applied

signal will

determine

the

coupling

use.

The

coupling

position

can

used

for

most

applications.

For

signals

with

frequencies

below

about

1kHz,

and

square

waves

whose

low-frequency

components

are

important

the

display,

necessary

use

coupling

obtain

satisfactory

presentation.

GND

position

disconnects

the

signal

source

from

the

amplifier

and

connects

resistive

ohm

termination,

thus

providing

the

same

type

load

the

signal

source.

The

input

the

amplifier

also

provided

with

ground

reference.

the

coupling

position,

the

component

the

signal

blocked

capacitor

the

input

circuit.

The

coupling

position

provides

the

best

display

signals

with

component

much

larger

than

the

component.

The

PRE-CHG

feature

should

used

when

there

possibility

having

residual

charge

the

input

capacitor

the

opposite

polarity

the

intended

input,

and

when

the

algebraic

sum

the

charges

may

greater

than

the

maximum

input

limitations

the

amplifier.

use

this

feature,

first

set

the

coupling

switch

PRE-CHG,

then

connect

the

signal

source

the

INPUT

and

wait

about

two

seconds

for

the

coupling

capacitor

charge,

set

the

coupling

switch

AC.

Another

useful

feature

of the

PRE-CHG

position

that

can

used

as a

calibrated

100X

attenuator

having

input

impedance

five

kilohms

series

with

two

microfarads.

This

extends

the

Low

Frequency

response

less

than

Hz.

Input

power

should

limited

1/8

watt

this

mode.

2-2

The

GND

position

disconnects

the

signal

source

from

the

amplifier

and

connects

capacitive

coupled

ohm

termination,

thus

providing

the

same

type

load

the

signal

source.

The

input

the

amplifier

also

pro-

vided

with

ground

reference.

VOLTS/DIV

Switch

The

amount

deflection

produced

signal

determined

the

signal

amplitude,

the

attenuation

factor

the

probe,

the

setting

the

VOLTS/DIV

switch,

and

the

setting

of the

Input

Coupling

switch.

Calibrated

deflection

factors

represented

the

VOLTS/DIV

switch

apply

only

when

the

probe

attenuation

and

when

the

Input

Coupling

switch

not

the

PRE-CHG

position

(the

PRE-CHG

position

has

attenuation

100X).

POLARITY

Switch

The

POLARITY

switch

provides

means

inverting

the

displayed

signal.

With

the

POLARITY

switch

set

+UP,

positive-going

signal

the

INPUT

produces

upward

deflection

the

CRT

display.

With

the

POLARITY

switch

set

INVERT,

positive-going

signal

will

produce

downward

deflection

the

CRT

display.

Trace

Identification

and

Readout

Functions

When

the

IDENTIFY

button

pressed,

the

trace

deflected

upward

about

0.3

division

identify

the

7A19

trace.

This

feature

particularly

useful

when

multiple

traces

are

displayed

the

CRT.

mainframes

with

readout,

also

replaces

the

deflection

factor

readout

with

the

word

“IDENTIFY”.

The

7A19

equipped

with

probe

encoding

circuitry

that,

when

used

with

coded

probe,

corrects

the

deflection

factor

readout.

VARIABLE

DELAY

(Option

The

optional

VARIABLE

DELAY

line

provides

means

for

delaying

the

signal

applied

the

INPUT

for

+500

ps.

APPLICATIONS

General

The

following

information

describes

the

procedures

and

techniques

for

making

measurements

with

7A19

and

the

associated

TEKTRONIX

oscilloscope

and

time-base.

These

applications

are

not

described

detail,

since

each

application

must

adapted

the

requirements

the

individual

measurements.

This

instrument

can

also

used

for

many

applications

which

are

not

described

this

REV

OCT

1979

manual.

Contact

your

local

TEKTRONIX

Field

Office

representative

for

assistance

making

specific

measure-

ments.

Peak-to-Peak

Voltage

Measurements

(AC)

make

peak-to-peak

voltage

measurements,

use

the

following

procedure:

Apply

the

signal

the

INPUT

connector.

Set

the

Coupling

switch

AC.

NOTE

For

low-frequency

signals

below

about

kHz,

use

the

position

prevent

attenuation

the

signal.

Set

the

VOLTS/DIV

switch

display

about

five

vertical

divisions

the

waveform.

Set

the

time-base

Triggering

controls

for

stable

display.

Set

the

time

base

sweep

rate

which

displays

several

cycles

the

waveform.

Turn

the

7A19

POSITION

control

the

lower

portion

the

waveform

coincides

with

one

the

graticule

lines

below

the

center

horizontal

line,

and

the

top

the

waveform

within

the

viewing

area.

With

the

time

base

Position

control,

move

the

display

one

the

upper

peaks

lies

near

the

center

vertical

line

(see

Fig.

2-1).

Measure

the

divisions

vertical

deflection

peak

peak.

NOTE

This

technique

can

also

used

make

measurements

between

two

points

the

waveform,

rather

than

peak

peak.

Multiply

the

distance

measured

step

the

VOLTS/DIV

switch

setting.

Include

the

attenuation

factor

the

probe,

used.

EXAMPLE:

Assume

that

the

peak

vertical

deflection

4.5

divisions

using

10X

attenuator

probe,

and

the

VOLTS/DIV

switch

set

1V.

Operating

Instructions—7A19

Position

center

vertical

line

Vertical

deflection

Fig.

2-1.

Measuring

the

peak

voltage

waveform.

vertical

probe

Volts

deflection

attenuator

woe

setting

(divisions)

factor

Substituting

the

given

values:

Volts

Peak

4.5

The

peak-to-peak

voltage

volts.

When

using

coded

probe

and

oscilloscope

equipped

with

readout,

simply

multiply

the

distance

measured

step

the

deflection

factor

displayed

the

CRT.

Instantaneous

Voltage

Measurements

(DC)

measure

the

level

at a

given

point

waveform,

proceed

follows:

Connect

the

signal

the

INPUT

connector.

Set

the

VOLTS/DIV

switch

display

about

five

divisions.

Set the

Coupling

switch

GND,

and

position

the

trace

the

bottom

graticule

line

other

reference

line.

the

voltage

negative

with

respect

ground,

position

the

2-3

Operating

Instructions—7A19

trace

the

top

graticule

line.

not

move

the

POSITION

control

after

this

reference

line

has

been

established.

Set

the

Coupling

switch

DC.

The

ground

reference

line

can

checked

any

time

switching

the

GND

position.

NOTE

measure

voltage

level

with

respect

another

voltage

rather

than

ground,

make

the

following

changes

Step

Set

the

Coupling

switch

and

apply

the

reference

voltage

the

INPUT

connector.

Then

position

the

trace

the

reference

line

and

disconnect

the

reference

voltage.

Set

the

time-base

Triggering

controls

for

stable

display.

Set

the

Time

Base

sweep

rate

for

optimum

display

of the

waveform.

Measure

the

distance

divisions

between

the

reference

line

and

the

point

the

waveform

which

the

level

measured.

For

example,

Fig.

2-2

the

measurement

between

the

reference

line

and

point

Establish

the

polarity

the

waveform.

With

the

POLARITY

switch

the

NORM

position,

any

point

above

the

reference

line

positive.

Multiply

the

distance

measured

step

the

VOLTS/DIV

switch

setting.

Include

the

attenuation

factor

the

probe,

used.

EXAMPLE:

Assume

the

vertical

distance

measured

3.6

divisions

(see Fig.

2-2)

and

the

waveform

above

the

reference

line,

using

10X

probe

with

VOLTS/DIV

switch

setting

0.5

Using

the

formula:

Instan-

vertical

VOLTS/

probe

taneous =

distance

polarity

DIV

attenuation

voltage

(divisions)

setting

factor

Substituting

the

given

values:

Instantaneous

Voltage

3.6

O5V

The

instantaneous

voltage

volts.

Matching

transit

times

using

two

7A19’s,

one

having

VARIABLE

DELAY

(Option

some

applications

it is

necessary

view

the

time

relationship

two

signals,

one

with

respect

the

other.

2-4

Point

Vertical

distance

eference

line

Fig.

2-2.

Measuring

instantaneous

voltage

with

respect

same

reference.

With

high

speed

signals,

the

transit

times

the

probes

and

amplifiers

can

distort

the

true

time

relationship

of the

two

signals.

using

the

VARIABLE

DELAY

(Option

4),

the

transit

times

between

two

units

can

matched

within

ps,

thus

giving

true

time

relationship

the

signals

being

viewed.

For

matching

transit

times

two

7A19

with

probes,

proceed

follows:

Install

the

7A19

without

the

VARIABLE

DELAY

option

the

left

vertical

plug-in

compartment.

Install

the

7A19

with

VARIABLE

DELAY

option

the

right

vertical

plug-in

compartment.

Connect

the

probes

common

signal

source

greater

than

100

kHz

and

adjust

the

time-base

unit

for

the

fastest

sweep

available.

Set

the

Trigger

Source

switch

left

Vert,

and

Vertical

Mode

Alternate.

Set

both

7A19’s

the

same

deflection

factor

settings.

Center

both

displays

vertically.

Adjust

VARIABLE

DELAY

that

the

two

displays

are

superimposed.

The

transit

times

both

units

are

now

matched.

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