Tektronix 7A19 User manual

Tektronix,

Inc

P.O

Box 500

Beaverton,

Oregon

97077



Serial

Number

070-2129-00

MANUAL

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All

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reserved

Contentsof

this

publication imay

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be reproduced

any

form

without

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7Icktronix,

SECTION



SPECIFICATION

Introduction

Option 4

SECTION

OPERATING

INSTRUCTIONS

Front

Panel

Controls

and

Connectors

Operating

Instructions

and

Checkout

Applications

SECTION



CIRCUIT

DESCRIPTION

Block

Diagram

Detailed

Circuit

Description

SECTION



MAINTENANCE

Preventive

Maintenance

Troubleshooting

Corrective

Maintenance

SECTION5



CALIBRATION

Performance

Check

Test

Equipment

Required

Calibration

Procedure

Index

Calibration

Procedure

SECTION6



ELECTRICAL

PARTS

LIST

SECTION



DIAGRAMS

Circuit

Board

Illustrations

Semiconductor

Electrode Configurations

SECTION



MECHANICAL

PARTS

LIST

Exploded

View

Drawing

CHANGE

INFORMATION

CONTENT

7A19

Fig

1-1

7A19

Amplifier

plug-in

(Left)

and

7A19

with

Variable delay

option

(Right)

1243-12

REV

AUG

1976

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

of the

7000-Series

oscilloscopes,

but

pri-

marily

intended

for

use

the

vertical

plug-in

compartments

Characteristic

Deflection

Factor

Calibrated

Range

Gain

Ratio

Accuracy

Frequency

Response

(8 divi-

sion

reference,

mainframe

dependent)

Upper

Bandwidth

coupled 10

mV/div

V/div

Lower

Bandwidth

Coupled

Maximum

Input

Power

coupled

Voltage

(AC

coupled)

Input

Impedance

Resistance

(DC

GND)

Reflection Coefficient

(Time

Domain)

Maximum

Input

Current

REV

SEPT

197

kHz

less

ohms

±1

ohm

Less

than

TABLE

1-1

ELECTRICAL

Performance

Requirement

Less than

peak

Option

mV/div

V/div,

steps

sequence

Within

with

GAIN

adjusted

mV/div

when

driven

from

ohm

source

With

7400,

MHz

;

With

7500,

100

MHz

;

With

7700,

175

MHz

;

With

7900,

500

MHz

watts

average

divisions

peak

deflection

100

volts

(DC

peak

AC)

not

exceed

watts

average

divisions

peak

Section

1-7A19

The

following

electrical

characteristics

are

valid

over

the

stated

environmental

range

for

instruments

calibrated

ambient

temperature

+20

+30

and

after

five

minute

warmup

unless

otherwise

noted

optional

VARIABLE

DELAY

may

ordered

with

the

7A19

provide

signal

delay

±500

Supplemental

Information

Pre-Charge

circuit

may

used as

calibrated

100X

attenuator

Front

panel

GAIN

control

allows

calibra-

tion

mainframe

°77ON

Pre-charge

circuit

must

be used

for

both

charging

and

discharging

coupling

capacitor

potentials

greater

than

divisions

equivalent

voltage

VSWR

typically

less

than

.25

500

MHz

Specifications-7A19

Display

Noise

(Tangentially

Measured)

Drift

with

ambient

temperature

(line

voltage constant)

TABLE

1-2



TABLE

1-3

ENVIRONMENTAL

CHARACTERISTICS



PHYSICAL

Deflects

trace

approximately 0

division

Size



Fits

all

7000-Series

plug-in

compartments

Refer



the



specifications



for



the



associated



Weight



7A19

kilograms

lbs

oscilloscope



7A19

(option



kilograms

lbs

General

Installation

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

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

of the

7A19

with

the oscilloscope tracks

and

insert

The

front panel

will

flush

with

the front of 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

of the oscilloscope

FRONT

PANEL

CONTROLS

AND

CONNECTORS

VOLTS/DIV



Selects

calibrated

deflection

factors

from



mV/Div



V/Div

;

steps

1-2-5

sequence

POSITION



Controls

the

position

of the

trace

IDENTIFY



Deflects

the

trace

about

division

for

trace

identification

instruments

with

readout,

also

replaces

readout

with

the

word

"IDENTIFY"

GAIN

Adjustment



Screwdriver



adjustment



permits

calibration

of deflection

factor

POLARITY



Provides

means

inverting

the

display

+UP

positive-going

signal at

the

INPUT

connector

deflects

the

CRT

display

upward

INSTRUCTION

Section

2-7A19

INVERT"

positive-going

signal at

the

INPUT

connector

deflects

the

CRT

display

downward

Input

Coupling



Selects

signal

input

coupling

mode

Switch

Probes

The

component

of 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 to

pre-charge

the

input

circuit

before

switching the

Input

coupling

switch

Both

and

components

of the

signal

are

coupled

to 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



Delays

the

signal

±500

(Option



picoseconds

using

calibrated

turn

dial

OPERATING

INS'TRUC'TIONS

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

mV,

kHz

signal

from the

oscilloscope Calibrator to

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

kHz, 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

of load to

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

Another

useful

feature

the

PRE-CHG

position

that

can

used

calibrated

100X

attenuator

having

input

impedance

five

kilohms

series

with

two

microfarads

This

extends

the

Low

Frequency

response

less

than

20 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 50

ohm

termination,

thus

providing the

same

type

load

the

signal

source

The

input

the

amplifier

also pro-

vided

with a ground

reference

VOLTS/D

Switch

The

amount

deflection

produced

signal

determined by

the

signal

amplitude,

the

attenuation

factor

the

probe, the

setting

the

VOLTS/DIV

switch,

and

the

setting

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 of

the

CRT

display

With the

POLARITY

switch

set

INVERT,

positive-going

signal will

produce

downward

deflection of

the

CRT

display

Trace

Identification

and

Readout

Functions

When

the

IDENTIFY

button

pressed,

the

trace

deflected

upward

about

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

General

APPLICATIONS

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

in detail,

since

each

application

must

adapted

the

requirements

the

individual

measurements

This

instrument

can

also

used

for

many

applications

which

are

not

described

this

manual

Contact

your

local

TEKTRONIX

Field

Office or

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 to

NOTE

For

low-frequency

signals

belowabout

kHz,

use

the

position to

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

NOTE

This

technique

can

also

used

make

measurements

between

two

points

the

waveform,

rather

than

peak

Multiply

the

distance

measured

step

the

VOLTS/DIV

switch

setting

Include

the

attenuation

factor

the

probe,

used

EXAMPLE

Assume

that

the peak

peak

vertical

deflection

divisions

using

10X

attenuator

probe,

and the

VOLTS/DIV

switch

set

Operating

Instructions--7A19

Fig

2-1

Measuring

the

peak

voltage

waveform

vertical

VOLTS/DIV

probe

Volts

deflection



setting



attenuator

(divisions)



factor

Substituting

the

given

values

Volts Peak

Peak =



The

peak-to-peak

voltage

volts

When

using

coded probe

and an

oscilloscope

equipped

with

readout,

simply

multiply

the

distance

measured

step

the

deflection

factor

displayed

the

CRT

Instantaneous

Voltage

Measurements

(DC)

measure

the

level

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

Operating

Instructions-7A19

trace

the

top

graticule

line

not

move

the

POSITION

control

after

this

reference

line

has

been

established

Set

the Coupling

switch to

The

ground

reference

line

can

be checked

any

time by

switching

the

GND

position

Set

the

time-base

Triggering

controls

for

stable

display

Set the

Time

Base

sweep

rate

for

optimum

display

the

waveform

Measure

the

distance

divisions

between

the

reference

line

and

the

point

the

waveform

which

the

level

be 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

6 by

the

VOLTS/DIV

switch

setting

Include

the

attenuation

factor

the probe,

used

EXAMPLE

Assume

the

vertical

distance

measured

divisions

(see

Fig

2-2)

and

the

waveform

above

the

reference

line,

using

10X

probe

with

VOLTS/DIV

switch

setting

Using the formula

Instan-

vertical



VOLTS/

probe

taneous

distance

polarity



DIV



attenuation

voltage

(divisions)



setting

factor

Substituting

the

given

values

The

instantaneous

voltage

volts

Matching

transit

times

using

two

7A19's,

one

having

VARIABLE

DELAY

(Option

some

applications

necessary

to view

the

time

relationship

two

signals,

one

with

respect

the

other

2-4

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

Instantaneous

Voltage

= 3



Fig

2-2

Measuring

instantaneous

voltage

with

respect to

same

reference

With

high

speed

signals,

the

transit

times

the

probes

and

amplifiers

can

distort

the

true

time

relationship

the

two

signals

using

the

VARIABLE

DELAY

(Option

4),

the

transit

times

between

two

units

can be

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 to

left

Vert,

and

Vertical

Mode

Alternate

Set

both

7A19's

the

same

deflection

factor

settings

Center both

displays

vertically

Adjust

VARIABLE

DELAY

so that

the

two

displays

are

superimposed

The

transit

times

both

units

are

now

matched

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Schertler ROY X quick guide