Tektronix 7603 User manual

7603/R7603

OSCILLOSCOPE

OPERATORS

Serial

Number

Tektronix,

inc.

-@®

P.O.

Box

500

-@

Beaverton,

Oregon

97005

-@

Phone:

644-0161

-@

Cables:

Tektronix

070-1310-00

672

oe

and

price

change

privileges

reserved.

.

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.replaceme’

directed

to

the

TE

KTRONIX

|

Field

Offi

epresentativ

in

your

area.

This

will

assure

you

t

fastest

possible

‘

service.

Please

‘include

the

instrument

Type

Number

or

Part

Number

and

Serial

Number

with

all

req

|

service.

arts.should

be.

Copyright

©

1972

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.

Se

“aig

TABLE

OF

CONTENTS

OPERATING

INSTRUCTIONS

Operating

Checkout

Controls

and

Connectors

Simplified

Operating

Instructions

General

Operating

Information

SPECIFICATIONS

Electrical

Environmental

and

Physical

System

Specification

RACKMOUNTING

INSTRUCTIONS

Dimensional

Drawing

7603/R7603

Operators

Page

1-3

1-4,

1-5

1-7

1-9

2-1

2-6

2-7

3-5

isaac

it

‘aa

.

eS

ay

BE

ee:

Oe

Ce

RR

7603

Features

The

TEKTRONIX

7603

Oscilloscope

is a

solid

state,

light

weight

instrument

designed

for

general-purpose

measuring

applications.

This

instrument

has

three

plug-in

compartments

that

accept

TEKTRONIX

7-series

plug-in

units

to

form

a

complete

measurement

system.

The

two

plug-in

compartments

on

the

left

are

connected

to

the

vertical

deflection

system.

The

right

plug-in

compartment

is

connected

to

the

horizontal

deflection

system.

Electronic

switching

between

the

vertical

plug-in

compartments

allows

a

multi-trace

vertical

display.

The

flexibility

of

this

plug-in

feature

and

the

variety

of

plug-in

units

available

allow

this

system

to

be

used

for

many

measurement

applications.

In

addition,

the

instrument

contains

a

readout

system

to

provide

a

CRT

display

of

alphanumeric

information

from

the

plug-in

units.

Data

such

as

deflection

factor,

sweep

rate,

etc.

can

be

encoded

and

displayed

on

the

CRT.

This

instrument

features

a

large-screen,

8

X

10

division

display;

each

division

equals

1.22

centimeters.

The

CRT

provides

small

spot

size

and

fast

writing

speed.

Regulated

DC

power

supplies

assure

that

performance

is

not

affected

by

variations

in

line

voltage

and

frequency,

or

by

changes

in

the

load

due

to

the

varying

power

requirements

of

the

plug-in

units.

Maximum

power

consumption

is

about

170

watts

(60

hertz,

115-volt

line).

on

asso

Soe

—

Baran

7603/R7603

Section

1—7603/R7603

Operators

OPERATING

INSTRUCTIONS

General

To

effectively

use

the

7603,

the

operation

and

capa-

bilities

of

the

instrument

must

be

known.

This

section

describes

the

operation

of

the

front-

and

rear-panel

controls

and

connectors

and

gives

simplified

and

general

operating

information.

PRELIMINARY

INFORMATION

Operating

Voltage

r

|

WARNING

This

instrument

is

designed

for

operation

from

a

power

source

with

its

neutral

at

or

near

earth

(ground)

potential

with

a

separate

safety-earth

conductor.

It

is

not

intended

for

operation

from

two

phases

of

a

multi-phase

system,

or

across

the

legs

of

a

single-phase,

three-wire

system.

The

7603

can

be

operated

from

either

a

110-volt

or

a

220-volt

nominal

line-voltage

source.

In

addition,

three

operating

ranges

can

be

selected

within

each

nominal

line

voltage

source.

The

voltage-selector

jumper

on

the

Rectifier

board

(see

Fig.

1-1)

allows

selection

of

the

operating

voltage.

To

convert

the

instrument

from

one

regulating

range

to

another,

first

disconnect

the

instrument

from

the

power

source.

Then,

slide

out

the

power

unit

as

described

in

the

Maintenance

section.

Remove

the

voltage-selector

jumper

and

re-install

it

on

the

set

of

pins

which

represent

the

desired

regulating

range.

Select

a

range

which

is

centered

about

the

average

line

voltage

to

which

the

instrument

is

to

be

connected

(see

Table

1-1).

TABLE

1-1

Regulating

Range

and

Fuse

Data

Pins

/

Regulating

Range

Selected

~

410-volts

nominal!

220-volts

nominal!

_

LOW

90

to

110

volts

|

180

to

220

volts

MED

99

to

121

volts

198

to

242

volts

HI

108

to

132

volts

218

to

262

volts

—

Line

Fuse

3.2

A

slow-blow

1.6

A

slow-blow_

REV.

D,

OCT.

1976

Voltage-selector

:

jumper

Fig. 1-1.

Locations

of

voltage-selector

jumper,

spare

jumper,

and

ALT

FUSE

in

power

unit

(7603

shown).

To

convert

from

110-volts

to

220-volts

nominal

line

voltage,

or

vice

versa,

remove

the

voltage-selector

jumper

and

replace

it

with

the

spare

jumper

(stored

on

pins

adjacent

to

voltage

selector

area).

The

jumpers

are

color-

coded

to

indicate

the

nominal

voltage

for

which

they

are

intended;

brown

for

110-volt

nominal

operation

and

red

for

220-volt

nominal

operation.

Change

the

line

fuse

to

provide

protection

for

the

selected

nominal

line

voltage.

Use

the

fuse

located

in

the

ALT

FUSE

holder

on

the

Rectifier

board

(see

Fig.

1-1)

or

see

Table

1-1

for

value.

Also,

change

the

line-cord

plug

to

match

the

power-source

receptacle

or

use

a

suitable

adapter.

Power

Cord

Conductor

Identification

Conductor

Color

Alternate

Color

Ungrounded

(Line)

Brown

Black

Grounded

(Neutral)

Blue

White

Grounding

(Earthing)

_Green-Yellow

Green-Yellow

The

7603

is

designed

to

be

used

with

a

three-wire

AC

power

system.

If

a

three-

to

two-wire

adapter

is

used

to

connect

this

instrument

to

a

two-wire

AC

power

system,

be

1-1

Operating

Instructions—7603/R7603

Operators

sure

to

connect

the

ground

lead

of

the

adapter

to

earth

(ground).

Failure

to

complete

the

ground

system

may

allow

the

chassis

of

this

instrument

to

be

elevated

above

ground

potential

and

pose

a

shock

hazard.

Operating

Temperature

The

7603

can

be

operated

where

the

ambient.

air

temperature

is

between

O°C

and

+50°C,

This

instrument

can

be

stored

in

ambient

temperatures

between

—55°C

and

+75°C.

After

storage

at

temperatures

beyond

the

operating

limits,

allow

the

chassis

temperature

to

come

within

the

operating

limits

before

power

is

applied.

The

7603

is

cooled

by

convection

air

flow

through

the

instrument.

Components

which

require

the

most

cooling

are

mounted

externally

on

a

heat

radiator

at

the

rear.

Adequate

clearance

must

be

provided

on

all

sides

to

allow

heat

to

be

dissipated

from

the

instrument.

Do

not

block

or

restrict

the

air

flow

through

the

holes

in

the

cabinet

or

the

heat

radiator

on

the

rear.

Maintain

the

clearance

provided

by

the

feet

on

the

bottom

and

allow

about

two

inches

clearance

on

the

top,

sides,

and

rear

(more

if

possible}.

The

R7603

is

cooled

by

air

drawn

in

through

the

air

filter

on

the

rear

panel

and

blown

out

through

the

holes

on

the

right

side.

Adequate

clearance

must

be

provided

at

these

locations.

Allow

at

least

one

and

one-half

inches

clearance

behind

the

air

filter

and

at

least

one

inch

on

the

right

side.

A

thermal

cutout

in

this

instrument

provides

thermal

protection

and

interrupts

the

power

to

the

instrument

if

the

internal

temperature

exceeds

a

safe

operating

level.

Power

is

automatically

restored

when

the

temperature

returns

to

a

safe

level.

Operation

in

confined

areas

or

in

close

proximity

to

heat-producing

instruments

may

cause

the

thermal

cutout

to

open

more

frequently.

Operating

Position

A

bale-type

stand

is

mounted

on

the

bottom

of

this

instrument.

This

stand

permits

the

7603

to

be

tilted

up

about

10°

for

more

convenient

viewing,

Rackmounting

Instructions

and

dimensional

drawings

for

rackmounting

the

R7603

are

located

in

Section

3

of

the

operators

manual.

DISPLAY

DEFINITIONS

General

The

following

definitions

describe

the

types

of

displays

which

can

be

obtained

with

a

7603

Oscilloscope

system

1-2

with

real-time

amplifiers,

time-base

units,

or

combinations

of

these.

Use

of

special

purpose

plug-in

units

may

result

in

different

types

of

displays,

which

are

defined

in

the

instruction

manuals

for

these

special

units.

The

following

terminology

will

be

used

throughout

this

manual.

Alternate

Mode

A

time-sharing

method

of

displaying

two

or

more

signals

with

a

single

cathode-ray

tube

beam.

Channel

switching

is

sequential

and

occurs

at

the

end

of

each

sweep.

Chopped

Mode

A

time-sharing

method

of

displaying

two

or

more

signals

with

a

single

cathode-ray

tube

beam.

Channel

switching

is

sequential

and

occurs

at

a

rate

determined

by

an

internal

clock

generator

(chopping

rate).

NOTE

See

Simplified

Operating

Instructions

in

this

section

for

set-up

information

to

obtain

each

of

the

following

displays.

Single

Trace

A

display

of

a

single

plot

produced

by

one

vertical

signal

and

one

sweep.

Dual

Trace

A

display

of

two

plots

produced

by

two

vertical

signals

and

one

sweep.

Delayed

Sweep

—

Single

Trace

A

display

of

a

single

plot

produced

by

one

vertical

signal

and

a

delayed

sweep.

Two

sweeps

are

used

to

produce

this

display;

the

sweeps

are

operating

with

a

delaying/delayed

relationship

where

one

sweep

(identified

as

the

delaying

sweep)

delays

the

start

of

the

second

sweep

(identified

as

the

delayed

sweep).

Delayed

Sweep

—

Dual

Trace

A

display

of

two

plots

produced

by

combining

two

vertical

signals

and

a

delayed

sweep.

Two

sweeps

are

used

to

produce

this

display;

the

sweeps

are

operating

with

a

delaying/delayed

relationship.

Each

vertical

signal

is

displayed

against

the

delayed

sweep.

x-Y

A

plot

of

two

variables,

neither

of

which

represents

time.

X

refers

to

the

horizontal

axis

and

Y

refers

to

the

vertical

axis.

PR,

EE,

—

PLUG-IN

UNITS

General

The

7603

is

designed

to

accept

up

to

three

TEKTRONIX

7-series

plug-in

units.

This

plug-in

feature

allows

a

variety

of

display

combinations

and

also

allows

selection

of

bandwidth,

sensitivity,

display

mode,

etc.

to

meet

the

measurement

requirements.

In

addition,

it

allows

the

oscilloscope

system

to

be

expanded

to

meet

future

measurement

requirements.

The

overall

capabilities

of

the

resultant

system

are

in

large

part

determined

by

the

characteristics

of

the

plug-in

selected.

For

complete

infor-

mation

on

plug-ins

available

for

use

with

this

instrument,

see

the

current

Tektronix,

Inc.

catalog.

Plug-In

installation

To

install

a

plug-in

unit

into

one

of

the

plug-in

compartments,

align

the

slots

in

the

top

and

bottom

of

the

plug-in

with

the

associated

guide

rails

in

the

plug-in

compartment.

Push

the

plug-in

unit

firmly

into

the

plug-in

compartment

until

it

locks

into

place.

To

remove

a

plug-in,

pull

the

release

latch

on

the

plug-in

to

disengage

it

and

pull

the

unit

out

of

the

plug-in

compartment.

Plug-in

units

can

be

removed

or

installed

without

turning

off

the

instrument

power.

It

is

not

necessary

that

all

of

the

plug-in

compartments

be

filled

to

operate

the

instrument;

the

only

plug-in

units

needed

are

those

required

for

the

measurement

to

be

made.

However,

at

environmental

extremes,

excess

radiation

may

be

radiated

into

or

out

of

this

instrument

through

the

open

plug-in

compartments.

Blank

plug-in

panels

are

available

from

Tektronix,

Inc.

to

cover

the

unused

compartment;

order

TEKTRONIX

Part

No.

016-0155-00.

When

the

7603

is

calibrated

in

accordance

with

the

calibration

procedure

given

in

the

service

manual,

the

vertical

and

horizontal

gain

are

standardized.

This

allows

calibrated

plug-in

units

to

be

changed

from

one

plug-in

compartment

to

another

without

recalibration.

However,

the

basic

calibration

of

the

individual

plug-in

units

should

be

checked

when

they

are

installed

in

this

system

to

verify

their

measurement

accuracy.

See

the

operating

instructions

section

of

the

plug-in

unit

instruction

manual

for

verifica-

tion

procedure.

Special

purpose

plug-in

units

may

have

specific

restric-

tions

regarding

the

plug-in

compartments

in

which

they

can

be

installed.

This

information

will

be

given

in

the

instruc-

tion

manual

for

these

plug-in

units.

NOTE

Later

production

of

rackmount

oscilloscopes

are

pro-

vided

with

support

posts

between

the

individual

plug-

in

compartments.

A

post

or

posts

must

be

removed

if

a

multiwidth

plug-in

is

to

be

installed.

To

remove

a

post,

unfasten

the

screws

that

secure

it

at

the

top

and

bottom

of

the

plug-in

housing.

REV.

B,

NOV.

1974

Operating

Instructions—7603/R7603

Operators

CONTROLS

AND

CONNECTORS

The

major

controls

for

operation

of

the

7603

are

located

on

the

front

panel

of

the

instrument.

Figs.

1-2

and

1-3

provide

a

brief

description

of

each

control

and

connector.

More

detailed

operating

information

is

given

under

General

Operating Information.

OPERATING

CHECKOUT

General

The

following

Operating

Checkout

provides

a

means

of

verifying

instrument

operation

and

basic

calibration

with-

out

removing

the

covers

or

making

internal

adjustments.

Since

it

demonstrates

the

use

of

all

controls

and

connec-

tors,

it

can

also be

used

to

provide

basic

training

on

the

operation

of

this

instrument.

|f

re-calibration

of

the

7603

appears

to

be

necessary,

see

the

Calibration

procedure

in

Section

5

of

the

Service

manual.

[f

re-calibration

of

a

plug-in

unit

is

indicated,

see

the

instruction

manual

for

the

appropriate

plug-in

unit,

Set-Up

Information

1.

Set

the

front-panel

controls

as

follows:

INTENSITY

Counterclockwise

FOCUS

Midrange

BEAM

FINDER

Released

GRATICULE

ILLUM

As

desired

VERT

MODE

LEFT

TRIG

SOURCE

VERT

MODE

POWER

Pushed

in

2.

Connect

the

7603

to

a

power

source

which

meets

the

voltage

and

frequency

requirements

of

this

instrument.

The

applied voltage

should

be

near

the

center

of

the

voltage

range

marked

on

the

rear

panel

(see

Operating

Voltage

in

this

section

for

information

on

converting

this

instrument

from

one

operating

voltage

to

another).

3.

Install

TEKTRONIX

7A-series

amplifier

units

into

both

the

left

and

right

vertical

plug-in

compartments.

Install

a

7B-series

time-base

unit

into

the

horizontal

compartment.

4,

Pull

the

POWER

switch

to

turn

the

instrument

on.

Allow

several

minutes

warmup

before

proceeding.

5.

Set

both

vertical

units

for

a

deflection

factor

of

two

volts/division

and

center

the

vertical

position

controls,

Set

both

vertical

units

for

AC

input

coupling.

1-3

Operating

Instructions~7603/R7603

Operators

Front

Panel

1.

INTENSITY—Controls

brightness

of

the

display.

Control

is

inoperative

when

horizontal

compartment

is

vacant.

2.

READOUT

—Turns

on

the

readout

display

and

controls

the

readout

intensity.

3.

FOCUS—Provides

adjustment

for

optimum

display

definition.

4,

GRATICULE

ILLUM—Controls

graticule

illumination.

5.

BEAM

FINDER—When

pressed,

the

scan

is

limited

to

within

the

graticule

area.

6.

TRIG

SOURCE-—Selects

source

of

internal

trigger

signal

for

the

time

base

plug-in

in

the

horizontal

compartment.

LEFT:

The

trigger

signal

is

obtained

from

the

plug-in

unit

in

the

left

vertical

compartment

only.

VERT

MODE:

Trigger

signal

automatically

follows

the

vertical

display

except

in

CHOP

and

ADD;

then

the

trigger

signal

is

the

algebraic

sum

of

the

signals

from

the

left

and

right

vertical

compartments.

RIGHT:

The

trigger

signal

is

obtained

from

the

plug-in

unit

in

the

right

vertical

compartment

only.

7.

POWER—

Switch:

Controls

power

to

the

instrument.

FUNCTIONS

OF

CONTROLS

AND

CONNECTORS

Light:

Indicates

that

the

power

switch

is

on

and

that

the

instrument

is

connected

to

a

line

voltage

source.

8.

CALIBRATOR—Calibrator

output

jacks

(4

V,

0.4

V,

40

mV,

ground).

Positive-going

pulse

or

DC

voltage

selected

by

changing

internal

jumper.

Repetition

rate

is

approximately

one

kilohertz.

9.

VERT

MODE-—Selects

vertical

mode

of

operation.

LEFT:

Signals

from

piug-in

unit

in

left

vertical

compartment

are

displayed.

ALT:

Signals

from

plug-in

units

in

both

the

left

and

right

vertical

compartments

are

displayed

(dual

trace).

Display

switched

between

vertical

plug-in

units

after

each

sweep.

ADD:

Signals

from

plug-in

units

in

both

the

left

and

right

vertical

compartments

are

algebraically

added

and

the

sum

is

displayed

on

the

CRT.

CHOP:

Signals

from

piug-in

units

in

both

the

left

and

right

vertical

compartments

are

displayed

(dual

trace),

The

display

is

switched

between

vertical

plug-in

units

at

approximately

one

megahertz

rate.

RIGHT:

Signals

from

plug-in

unit

in

right

vertical

compart-

ment

is

displayed.

10.

Camera

Power

(Not

Labeled)—Three-pin

connector

on

CRT

bezel

provides

power

output

(+15

V).

Receives

remote

single

sweep

reset

signal

from

compatible

camera

systems,

and

a

ground

connection,

TERT

RRL,

1.

S

a

Se

see

gg

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Be

ee

oeee

beanies:

Sodrea

.

RR

TRI

OES

See

poh

shane

POLaRHTY

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ue

t

Riiaviny

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oud

Smo

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Searsoegics

SOLER,

Vo

PR64a-

Fig.

1-2.

Front-panel

controls

and

connectors.

1-4

Operating

Instructions—7603/R

7603

Operators

SIMA,

e

iS

AMS

ene

:

,

1OG-<120V

RANGE

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aay

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LOA

SLOW

200-240V

RANGE

REMOTE-ERASE

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ALTERNATE

FUSE-INSIOE

VERT

SIG

OUT

MAIN

AUNILIARY

©

oy

BELAY

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ARIS

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ost

Me

ae

Rear

Panel

1.

FUSE—Line

voltage

fuse

for

instrument.

2.

SS

READY

OUT

—Provides

an

external

single

sweep

ready

indicator

signal

after

the

single

sweep

has

been

reset.

3.

EXT

SS

RESET

1N—Remote

single

sweep

reset.

4.

EXT

Z

AXIS

IN—Input

connector

for

intensity

modulation

of

the

CRT

display.

5.

VERT

SIG

OUT—Vertical

signal

selected

by

TRIG

SOURCE

switch

(LEFT,

RIGHT,

ALT

and

ADD).

6.

GATE

OUT—Gate

signal

selected

by

gate

selector

switch

(MAIN,

AUXILIARY,

and

DELAY).

7.

+

SAWTOOTH

OUT—Positive-going

sawtooth

from

time-base

unit.

RUMENT

W

CONNECTED

KOR

SINSIDE.

ext

ae

BeSE

Fig. 1-3.

Rear-panel

controls

and

connectors.

Operating

Instructions—7603/R7603

Operators

6.

Set

the

time-base

unit

for

a

sweep

rate

of

one

millisecond/division

in

the

auto,

internal

trigger

mode.

7.

Advance

the

INTENSITY

control

until

the

trace

is

at

the

desired

viewing

level

(near

midrange).

Advance

the

READOUT

until

the

readout

display

is

at

the

desired

viewing

level.

8.

Connect

the

4V

calibrator

pin-jack

to

the

input

of

the

left

vertical

unit

with

a

BNC

to

pin-jack

cable

(supplied

accessory).

Display

Focus

9.

Adjust

the

FOCUS

control

for

a

sharp,

well-defined

display

over

the

entire

trace

length.

If

a

properly

focused

display

cannot

be

obtained

with

the

FOCUS

control,

the

internal

Astigmatism

adjustment

must

be

re-set:

see

the

Calibration

section

of

the

Service

manual.

Trace

Alignment

10.

Disconnect

the

input

signal

and

position

the

trace

with

the

left

vertical

unit

position

control

so

it

coincides

with

the

center

horizontal

line of

the

graticule.

|f

the

trace

is

not

parallel

to

the

center

horizontal

line

of

the

graticule,

see

Trace

Rotation

adjustment

procedure

in

Calibration

section

of

the

service

manual.

Graticule

Illumination

11.

Rotate

the

GRAT

ILLUM

control

throughout

its

range

and

notice

that

the

illumination

of

the

graticule

lines

increases

as

the

control

is

turned

clockwise

(most

obvious

with

tinted

filter

installed).

Set

the

control

so

the

graticule

lines

are

illuminated

as

desired.

Vertical

Deflection

System

12.

Connect

the

4V

calibrator

signal

to

the

input

connector

of

the

left

vertical

unit

with

the

BNC

to

pin-jack

cable.

Set

both

vertical

units

for

a

deflection

factor

of

one

volt/division.

The

display

amplitude

should

be

four

divisions.

Note

the

exact

display

amplitude

for

step

15.

13.

Notice

that

the

position

control

of

only

the

left

vertical

unit

has

an

effect

on

the

position

of

the

display.

Position

the

display

to

the

upper

half

of

the

graticule.

1-6

14.

Press

the

RIGHT

button

of

the

VERT

MODE

switch.

Remove

the

calibrator

signal

from

the

left

vertical

and

connect

it

to

the

right

vertical.

The

display

amplitude

should

be

four

divisions

within

0.12

division.

Note

the

exact

display

amplitude

for

the

15.

A

correct

display

in

both

steps

12

and

14

indicates

that

the

7603

Vertical

Deflection

System

and

the

vertical

plug-in

units

are

calibrated.

If

the

displays

noted

previously

are

both

outside

the

given

tolerance

in

the

same

direction

(Le.,

high

or

low),

the

Vertical

Gain

or

4

Volts

calibrator

adjustment

probably

needs

re-adjustment.

Otherwise,

check

the

calibration

of

the

vertical

plug-in

units.

16.

Notice

that

the

position

control

of

only

the

right

vertical

unit

has

an

effect

on

the

position

of

the

display.

Position

the

display

to

the

lower

half

of

the

graticule.

Set

both

vertical

units

for

a

deflection

factor

of

two

volts/

division.

Connect

calibrator

signal

to

both

vertical

units

by

using

a

dual

input

coupler.

17.

Press

the

ALT

button

of

the

VERT

MODE

switch.

Notice

that

two

traces

are

displayed

on

the

CRT.

The

top

trace

is

produced

by

the

left

vertical

unit

and

the

bottom

trace

is

produced

by

the right

vertical

unit.

Set

the

sweep

rate

to

50

milliseconds/division.

Notice

that

the

display

alternates

between

the

left

and

right

vertical units

after

each

sweep.

Turn

the

sweep

rate

switch

throughout

its

range.

Notice

that

the

display

alternates

between

vertical

units

at

all

sweep

rates.

18.

Press

the

CHOP

button

of

the

VERT

MODE

switch.

Turn

the

sweep

rate

throughout

its

range.

Notice

that

a

dual-trace

display

is

presented

at

all

sweep

rates,

but

unlike

ALT

both

vertical

units

are

displayed

on

each

sweep

in

a

time-sharing

manner.

Return

the

sweep

rate

to

05

millisecond/division.

19.

Press

the

ADD

button

of

the

VERT

MODE

switch.

The

display

should

be

four

divisions

in

amplitude.

Notice

that

the

position

control

of

either

vertical

unit

moves

the

display.

Return

the

VERT

MODE

switch

to

LEFT.

Triggering

20.

Center

the

display

on

the

CRT

with

the

left

vertical

unit

position

control.

Disconnect

the

input

signal

from

the

right

vertical

unit

input

connector.

Sequentially

press

all

of

the

VERT

MODE

switch

buttons.

Notice

that

a

stable

display

is

obtained

in

all

positions

of

the

VERT

MODE

switch

(straight

line

in

RIGHT

position).

21.

Press

the

LEFT

button

of

the

TRIG

SOURCE

switch.

Again,

sequentially

press

all

of

the

VERT

MODE

buttons,

Notice

that

the

display

is

again

stable

in

all

positions,

as

in

the

@i

.

22,

Press

the

RIGHT

button

of

the

TRIG

SOURCE

switch.

Sequentially

press

all

of

the

VERT

MODE

buttons

and

notice

that

a

stable

display

cannot

be

obtained

in

any

position.

This

is

because

there

is

no

input

signal

connected

to

the

right

vertical

unit.

Return

the

TRIG

SOURCE

switch

to

VERT

MODE.

Remove

calibrator

signal

from

left

vertical

unit

and

connect

it

to

right

vertical

unit.

Repeat

steps

20

to

22,

The

trigger

signal

will

come

from

right

vertical.

When

the

LEFT

button

is

pressed

of

the

TRIG

SOURCE

switch

the

display

is

not

stable

because

there

is

no

input

signal

connected

to

the

left

vertical.

Return

the

TRIG

SOURCE

switch

to

VERT

MODE,

Horizontal

Deflection

System

23.

Position

the

start

of

the

sweep

to

the

left

graticule

line

with

the

time-base

unit

position

control.

24,

Connect

a

10X

probe

to

the

input

of

the

right

vertical

unit.

Set the

right

vertical

unit

for

a

deflection

factor

of

10

volts/division

and

set

the

VERT

MODE

switch

to

RIGHT.

Set

the

time-base

unit

for

a

sweep

rate

of

five

milliseconds/division.

25.

Connect

the

probe

tip

to

a

line-voltage

source.

The

display

should

show

three

complete

cycles

over

the

10

divisions

within

0.3

division.

A

correct

display

indicates

that

the

7603

Horizontal

Deflection

System

and

the

time-base

unit

are

correctly

calibrated.

If

the

display

is

outside

the

given

tolerance,

either

the

7603

or

the

time-base

unit

needs

to

be

recalibrated.

Refer

to

the

Calibration

section

of

the

Service

manual,

and

to

the

time-base

unit

manual

for

adjustment

procedure.

NOTE

This

step

is

based

on

an

accurate

60-Hertz

fine

frequency.

For

other

line

frequencies,

this

procedure

will

need

to

be

changed

accordingly.

26.

Disconnect

the

probe

from

the

line-voltage

source

and

the right

vertical

unit.

Set

the

VERT

MODE

switch

to

LEFT

and

set

the

time-base

unit

for

a

sweep

rate

of

0.5

millisecond/division.

Beam

Finder

27,

Set

the

deflection

factor

of

the

left

vertical

unit

to

0.1

voit/division.

Notice

that

a

square-wave

display

is

not

visible,

since

the

deflection

exceeds

the

scan

area

of

the

CRT.

®

Operating

Instructions—7603/R7603

Operators

28,

Press

and

hold

the

BEAM

FINDER

switch.

Notice

that

the

display

is

returned

to

the

viewing

area

in

compressed

form.

Increase

the

vertical

and

horizontal

deflection

factors

until

the

display

is

reduced

to

about

two

divisions

vertically

and

horizontally

(when

the

horizontal

unit

is

operated

in

the

time-base

mode,

change

only

the

deflection

factor

of

the

vertical

unit).

Adjust

the

position

controls

of

the

displayed

vertical

unit

and

the

time-base

unit

to

center

the

compressed

display

about

the

center

lines

of

the

graticule.

Release

the

BEAM

FINDER

switch.

Notice

that

the

display

remains

within

the

viewing

area,

Z-Axis

Input

29.

|f

an

external

signal

is

available

(five

volts

peak-to-

peak

minimum

at

two

megahertz

or

less},

the

function

of

the

EXT

2

AXIS

input

can

be

demonstrated.

Connect

the

external

signal

to

both

the

input

of

the

right

vertical

unit

and

the

EXT

Z

AXIS

connector

with

two

BNC

cables

and

a

BNC

T

connector.

Set the

VERT

MODE

switch

to

RIGHT

and

set

the

vertical

unit

for

a

deflection

factor

of

two

volts/division.

Set

the

time-base

unit

for

a

sweep

rate

which

displays

several

cycles

of

the

signal.

Adjust

the

amplitude

of

the

signal

generator

until

intensity

modulation

is

visible

on

the

display.

The

positive

peaks

of

the

waveform

should

be

blanked

out and

the

negative

peaks

intensified.

Notice

that

the

setting

of

the

INTENSITY

control

determines

the

amount

of

intensity

modulation

that

is

visible.

30.

Disconnect

the

signal

from

the

EXT

Z

AXIS

connector,

but

leave

it

connected

to

the

right

vertical

unit

input.

Check

that

peak-to-peak

amplitude

of

the

displayed

signal

is

four

divisions

maximum.

31.

This

completes

the

Operating

Checkout

procedure

for

the

7603.

Instrument

operations

not

explained

here,

or

operations

which

need

further

explanation

are

discussed

under

General

Operating

Information.

SIMPLIFIED

OPERATING

INSTRUCTIONS

The

following

information

is

provided

to

aid

in

quickly

obtaining

the

correct

setting

for

the

7603

controls

to

present

a

display.

The

operator

should

be

familiar

with

the

complete

function

and

operation

of

this

instrument

as

described

elsewhere

in

this

section

before

using

this

procedure.

For

detailed

operating

information

for

the

plug-in

units,

see

the

instruction

manuals

for

the

applicable

units.

Operating

Instructions—7603/R7603

Operators

Single-Trace

Display

The

following

procedure

will

provide

a

display

of

a

single-trace

vertical

unit

against

one

time-base

unit.

For

simplicity

of

explanation,

the

vertical

unit

is

installed

in

the

left

vertical

compartment.

The

right

vertical

compartment

can

be

used

if

the

procedure

is

changed

accordingly.

1.

install

a

7A-series

vertical

unit

in

the

left

vertical

compartment.

2.

Press

the

LEFT

button

of

the

VERT

MODE

switch.

3.

Install

a

7B-series

time-base

unit

in

the

horizontal

compartment.

4.

Press

the

VERT

MODE

button

of

the

TRIG

SOURCE

switch.

5.

Connect

the

signal

to

the

input

connector

of

the

vertical

unit.

6.

Set

the

vertical

unit

for

AC

input

coupling

and

calibrated

deflection

factors.

7,

Set the

time-base

unit

for

auto

mode,

internal

triggering

at

a

calibrated

sweep

rate

of

one

millisecond/

division.

8.

Advance

the

INTENSITY

control

until

a

display

is

visible.

(If

no

display

is

visible

with

INTENSITY

at

about

midrange,

press

and

hold

the

BEAM

FINDER

switch

and

adjust

the

vertical

deflection

factor

until

the

display

is

reduced

in

size

vertically;

then

center

the

compressed

display

with

vertical

and

horizontal

position

controls;

release

the

BEAM

FINDER.)

Adjust

the

FOCUS

control

for

a

well-defined

display.

Adjust

Readout

INTENSITY

for

the

desired

viewing

level.

9.

Set

the

vertical

deflection

factor

and

vertical

position

control

for

a

display

which

remains

within

the

graticule

area

vertically.

10.

1f

necessary,

set

the

time-base

triggering

controls

for

a

stable

display.

11.

Adjust

the

time-base

position

control

so

the

display

begins

at

the

left

edge

of

the

graticule.

Set

the

time-base

sweep

rate

to

display

the

desired

number

of

cycles.

1-8

Dual-Trace

Display

The

following

procedure

will

provide

a

display

of

two

single-trace

vertical

units

against

one

time-base

unit.

1.

Install

7A-series

vertical

units

in

both

vertical

plug-in

compartments.

2.

Press

the

LEFT

button

of

the

VERT

MODE

switch.

3.

Install

a

7B-series

time-base

unit

in

the

horizontal

compartment.

4.

Press

the

VERT

MODE

button

of

the

TRIG

SOURCE

switch.

5.

Connect

the

signal

to

the

input

connectors

of

the

vertical

units.

6.

Set

the

vertical

units

for

AC

input

coupling

and

calibrated

deflection

factors.

7.

Set

the

time-base

unit

for

auto

mode,

internal

triggering

at

a

sweep

rate

of

one

millisecond/division.

8.

Advance

the

INTENSITY

control

until

a

display

is

visible.

(If

no

display

is

visible

with

INTENSITY

at

midrange,

press

and

hold

BEAM

FINDER

switch

and

adjust

vertical

deflection

factor

until

display

is

reduced

in

size

vertically;

then

center

compressed

display

with

vertical

and

horizontal

position

controls;

release

the

BEAM

FINDER

switch.)

Set

the

FOCUS

control

for

a

well-defined

display.

9.

Set

the

left

vertical

unit

deflection

factor

for

a

display

about

four

divisions

in

amplitude,

Adjust

the

left

vertical

position

control

to

move

this

display

to

the

top

of

the

graticule

area.

10.

Press

the

RIGHT

button

of

the

VERT

MODE

switch.

11.

Set

the

RIGHT

vertical

unit

deflection

factor

for

a

display

about

four

divisions

in

amplitude

(if

display

cannot

be

located,

use

BEAM

FINDER

switch).

Position

this

display

to

the

bottom

of

the

graticule

area

with

the

right

vertical

unit

position

control.

12.

Press

the

ALT

or

CHOP

button

of

the

VERT

MODE

switch.

A

dual-trace

display

of

the

signal

from

the

left

®

vertical

and

right

vertical

plug-in

units

should

be

presented

on

the

CRT.

(For

more

information

on

choice

of

dual-trace

mode,

see

Vertical

Mode

in

this

section.)

13.

If

necessary,

adjust

the

time-base

triggering

controls

for

a

stable

display.

14.

Adjust

the

time-base

position

control

so

the

display

begins

at

the

left

edge

of

the

graticule.

Set

the

time-base

sweep

rate

for

the

desired

horizontal

display.

Delayed

Sweep

—

Single

Trace

The

following

procedure

will

provide

a

delayed

sweep

display

of

a

single-trace

vertical

unit.

1.

Follow

the

complete

procedure

given

under

Single-

Trace

Displays.

2.

Be

sure

the

time-base

unit

installed

in

the

horizontal

compartment

is a

dual

time-base

with

delaying/delayed

capabilities.

3.

Follow

the

procedure

given

in

the

instruction

manual

for

the

dual

time-base

unit

to

obtain

a

delayed-sweep

display.

Delayed

Sweep

—

Dual

Trace

The

following

procedure

will

provide

a

delayed-sweep

display

of

two

single-trace

vertical

units.

1.

Follow

the

complete

procedure

given

under

Dual-

Trace

Display.

2.

Be

sure

the

time-base

unit

installed

in

the

horizontal

compartment

is

a

dual

time-base

unit

with

delaying/delayed

capabilities.

3.

Follow

the

procedure

given

in

the

instruction

manual

for

the

dual

time-base

unit

to

obtain

a

delayed-sweep

display.

X-Y

Display

The

following

procedure

will

provide

an

X-Y

display

(one

signal

versus

another

rather

than

against

time).

Operating

Instructions—7603/R7603

Operators

NOTE

Some

7B8-series

time-base

units

have

provisions

for

amplifier

operation

in

the

X-Y

mode;

see

X-Y

operation

in

this

section

for

details

of

operation

in

this

manner.

1.

Install

7A-series

amplifier

units

in

both

the

left

vertical

and

the

horizontal

compartments.

2.

Press

the

LEFT

button

of

the

VERT

MODE

switch.

3.

Connect

the

X-signal

to

the

amplifier

unit

in

the

horizontal

compartment.

4.

Connect

the

Y-signal

to

the

amplifier

unit

in

the

left

vertical

compartment.

5.

Set

both

amplifier

units

for

AC

input

coupling

and

calibrated

deflection

factors.

6.

Advance

the

INTENSITY

control

until

a

display

is

visible.

(If

no

display

is

visible,

press

and

hold

BEAM

FINDER

switch

and

adjust

the

deflection

factors

of

both

amplifier

units

until

display

is

reduced

in

size

both

vertically

and

horizontally;

then

center

compressed

display

with

the

position

controls;

release

the

BEAM

FINDER

switch.)

Adjust

the

FOCUS

control

for

a

well-defined

display.

GENERAL

OPERATING

INFORMATION

Intensity

Control

The

setting

of

the

INTENSITY

control

may

affect

the

correct

focus

of

the

display.

Slight

re-adjustment

of

the

FOCUS

control

may

be

necessary,

when

the

intensity

level

is

changed.

To

protect

the

CRT

phosphor:

do

not

turn

the

INTENSITY

control

higher

than

necessary

to

provide

a

satisfactory

display.

The

light

filters

reduce

the

observed

light

output

from

the

CRT.

When

using

these

filters,

avoid

advancing

the

INTENSITY

control

to

a

setting

that

may

burn

the

phosphor.

When

the

highest

intensity

display

is

desired,

remove

the

filters

and

use

only

the

clear

faceplate

protector

(permanently

installed

behind

bezel).

Apparent

trace

intensity

can

also

be

improved

in

such

cases

by

reducing

the

ambient

light

level

or

using

a

viewing

hood.

Also,

be

careful

that

the

INTENSITY

control

is

not

set

too

high

when

changing

the

time-base

unit

sweep

rate

from

a

fast

to

a

slow

sweep

rate,

or

when

changing

to

the

X-Y

mode

of

operation.

The

instrument

incorporates

protection

circuitry

which

automatically

reduces

the

display

intensity

to

a

lower

level

when

the

time-base

unit

is

set

to

a

slow

sweep

rate.

This

reduces

the

danger

of

damaging

the

CRT

phosphor

at

these

slower

sweep

rates.

Operating

Instructions—7603/R7603

Operators

Display

Focus

The

FOCUS

control

allows

adjustment

for

best

defini-

tion

of

the

CRT

display.

The

Readout

intensity

should

be

turned

on,

when

adjusting

the

Focus

control.

Slight

re-adjustment

of

this

control

may

be

necessary

as

the

display

conditions

change.

If

a

properly

focused

display

cannot

be

obtained

with

the

FOCUS

control,

the

internal

Astigmatism

adjustment

must

be

re-set;

see

the

Calibration

section

of

the

service

manual.

Graticule

The

graticule

of

the

7603

is

marked

on

the

inside

of

the

faceplate

of

the

CRT,

providing

accurate,

no-parallax

measurements.

The

graticule

is

divided

into

eight

vertical

and

ten

horizontal

divisions.

Each

division

is

1.22

centimeters

square.

In

addition,

each

major

division

is

divided

into

five

minor

divisions.

The

vertical

gain

and

horizontal

timing

of

the

plug-in

units

are

calibrated

to

the

graticule

so

accurate

measurements

can

be

made

from

the

CRT.

The

illumination

of

the

graticule

lines

can

be

varied

with

the

GRATICULE

ILLUM

control.

NOTE

Two

types

of

crt

graticules

have

been

used

in

some

Tektronix

oscilloscopes.

One

graticule

has

0%

and

100%

risetime

reference

points

that

are

separated

by

6

vertical

graticule

divisions.

The

other

graticule

has

the

0%

and

100%

risetime

reference

points

separated

by

5

vertical

divisions.

In

your

manual,

illustrations

of

the

ert

face

or

risetime

measurement

instructions

may

not

correspond

with

the

graticule

markings

on

your

oscilloscope.

Fig.

1-4

shows

the

graticule

of

the

7603

and

defines

the

various

measurement

lines.

The

terminology

defined

here

will

be

used

in

all

discussions

involving

graticule

measure-

ments.

Notice

the

0%,

10%,

90%

and

100%

markings

on

the

left

side

of

the

graticule.

These

markings

are

provided

to

facilitate

risetime

measurements.

First

Center

Ninth

vertical

line

re

Center

line

€1310-05

Fig.

1-4.

Definition

of

measurement

lines

on

7603

graticule.

1-10

Light

Filter

The

tinted

filter

provided

with

the

7603

minimizes

light

reflections

from

the

face

of

the

CRT

to

improve

contrast

when

viewing

the

display

under

high

ambient

light

condi-

tions.

This

filter

should

be

removed

for

waveform

photo-

graphs

or

when

viewing

high

writing

rate

displays.

To

remove

the

filter,

loosen

the

two

screws

on

the

right

side

of

the

bezel

and

remove

the

bezel.

Remove

the

tinted

filter:

leave

the

clear

plastic

faceplate

protector

installed

and

replace

the

bezel.

The

faceplate

protector

should

be

left

in

place

at

all

times

to

protect

the

CRT

faceplate

from

scratches.

An

optional

mesh

filter

is

available

for

use

with

the

7603.

This

filter

provides

shielding

against

radiated

EMI

(electro-magnetic

interference)

from

the

face

of

the

CRT.

It

also

serves

as

a

light

filter

to

make

the

trace

more

visible

under

high

ambient

light

conditions.

The

mesh

filter

fits

in

place

of

the

plastic

CRT

mask

and

the

tinted

filter.

The

filter

can

be

ordered

by

TEKTRONIX

Part

No.

378-0603-00.

Beam

Finder

The

BEAM

FINDER

switch

provides

a

means

of

locating

a

display

which

overscans

the

viewing

area

either

vertically

or

horizontally.

When

the

BEAM

FINDER

switch

is

pressed

and

held,

the

display

is

compressed

within

the

graticule

area.

Release

the

BEAM

FINDER

switch

to

return

to

a

normal

display.

To

locate

and

reposition

an

overscanned

display,

use the

following

procedure:

1.

Press

and

hold

the

BEAM

FINDER

switch.

2.

Increase

the

vertical

and

horizontal

deflection

factors

until

the

vertical

deflection

is

reduced

to

about

two

divisions

and

the

horizontal

deflection

is

reduced

to

about

four

divisions

(the

horizontal

deflection

needs

to

be

reduced

only

when

in

the

X-Y

mode

of

operation).

3.

Adjust

the

vertical

and

horizontal

position

controls

to

center

the

display

about

the

vertical

and

horizontal

center

lines

of

the

graticule.

4,

Release

the

BEAM

FINDER

switch;

the

display

should

remain

within

the

viewing

area.

Readout

Modes

The

characters

of

the

readout

display

are

written

by

the

CRT

beam

on

a

time-share

basis

with

signal

waveforms.

The

Readout

system

operates

in

a

free

running

mode

to

randomly

interrupt

the

waveform

display

to

present

the

readout

characters.

The

readout

system

can

also

operate

in

a

GATE

TRIG’D

mode.

No

readout

signal

is

produced

until

after

the

sweep

has

occurred.

In

this

mode

the

sweep

must

run

to

have

the

readout

displayed.

REV.

B,

JULY,

1975

at,

Py,

Display

Photography

A

permanent

record

of

the

CRT

display

can

be

obtained

with

an

oscilloscope

camera

system.

The

instruction

manuals

for

the

TEKTRONIX

Oscilloscope

Cameras

include

complete

instructions

for

obtaining

waveform

photographs.

The

following

specific

information

applies

to

the

7603.

The

CRT

bezel

of

the

7603

provides

integral

mounting

for

a

TEKTRONIX

Oscilloscope

Camera.

The

three

pins

located

on

the

left

side

of

the

CRT

bezel

connect

power

to

compatible

camera

systems.

it

also

receives

control

signals

from

TEKTRONIX

automatic

cameras

to

allow

camera-

controlled

single-shot

photography

(see

camera

manual

for

further

information).

Vertical

Mode

Left

and

Right

Mode.

When

the

LEFT

or

RIGHT

button

of

the

VERT

MODE

switch

is

pressed,

only

the

signal

from

the

plug-in

unit

in

the

selected

compartment

is

displayed,

Alternate

Mode.

The

ALT

position

of

the

VERT

MODE

switch

produces

a

display

which

alternates

between

the

plug-in

units

in

the

left

vertical

and

right

vertical

compart-

ments

with

each

sweep

of

the

CRT.

Although

the

ALT

mode

can

be

used

at

all

sweep

rates,

the

CHOP

mode

provides

a

more

satisfactory

display

at

sweep

rates

below

about

20

milliseconds/division.

At

these

slower

sweep

rates,

alternate-mode

switching

becomes

visually

perceptible.

NOTE

This

instrument

will

not

operate

in

the

ALT

mede

if

the

horizontal

plug-in

unit

is

not

operated

in

the

time-base

mode.

The

TRIG

SOURCE

switch

allows

selection

of

the

triggering

for

an

alternate

display.

When

this

switch

is

set

to

the

VERT

MODE

position,

each

sweep

is

triggered

by

the

signal

being

displayed

on

the

CRT.

This

provides

a

stable

display

of

two

unrelated

signals,

but

does

not

indicate

the

time

relationship

between

the

signals.

In

either

the

LEFT

or

RIGHT

positions

of

the

TRIG

SOURCE

switch,

the

two

signals

are

displayed

showing

true

time

relationship.

However,

if

the

signals

are

not

time-related,

the

display

from

the

plug-in

unit

which

is

not

providing

a

trigger

signal

will

appear

unstable

on

the

CRT.

Chopped

Mode.

The

CHOP

position

of

the

VERT

MODE

switch

produces

a

display

which

is

electronically

switched

between

channels

at

a

one-megahertz

rate.

In

general,

the

CHOP

mode

provides

the

best

display

at

sweep

Operating

Instructions—7603/R7603

Operators

rates

lower

than

about

20

milliseconds/division,

or

whenever

dual-trace

single-shot

phenomena

are

to

be

displayed.

At

faster

sweep

rates,

the

chopped

switching

becomes

apparent

and

may

interfere

with

the

display.

Correct

internal

triggering

for

the

CHOP

mode

can

be

obtained

in

any

of

the

three

positions

of

the

TRIG

SOURCE

switch.

When

the

TRIG

SOURCE

switch

is

set

to

VERT

MODE,

the

internal

trigger

signals

from

the

vertical

plug-in

units

are

algebraically

added

and

the

time-base

unit

is

triggered

from

the

resultant

signal.

Use

of

the

LEFT

or

RIGHT

trigger-source positions

trigggers

the

time-base

unit

on

the

internal

trigger

signal

from

the

selected

vertical

unit

only.

This

allows

two

time-related

signals

to

be

displayed

showing

true

time

relationship.

However,

if

the

signals

are

not

time-related,

the

display

from

the

channel

which

is

not

providing

the

trigger

signal

will

appear

unstable.

The

CHOP

mode

can

be

used

to

compare

two

single-shot, transient,

or

random

signals

which

occur within

the

time

=

interval

determined

by

the

time-base

unit

(ten

times

selected

sweep

rate).

To

provide

correct

triggering,

the

display

which

provides

the

trigger

signal

must

precede

the

second

display

in

time.

Since

the

signals

show

true

time

relationship,

time-difference

measurements

can

be

made

from

the

display.

Algebraic

Addition.

The

ADD

position

of

the

VERT

MODE

switch

can

be

used

to

display

the

sum

or

difference

of

two

signals,

for

common-mode

rejection

to

remove

an

undesired

signal,

or

for

DC

offset

(applying

a

DC

voltage

to

one

channnel

to

offset

the

DC

component

of

a

signal

on

the

other

channel).

The

common-mode

rejection

ratio

between

the

vertical

plug-in

compartments

of

the

7603

is

greater

than 20:1

at

50

megahertz.

The

rejection

ratio

increases

to

100:1

at

DC.

The

overall

deflection

factor

on

the

CRT

in

the

ADD

mode

is

the

resultant

of

the

algebraic

addition

of

the

signals

from

the

two

vertical

plug-in

units.

It

is

difficult

to

determine

the

voltage

amplitude

of

the

resultant

display

unless

the

amplitude

of

the

signal

applied

to

one

of

the

plug-in

units

is

known.

This

is

particularly

true

when

the

vertical

units

are

set

to

different

deflection

factors,

since

it

is

Not

obvious

which

portion

of

the

display

is a

result

of

the

signal

applied

to

either

plug-in

unit.

Also,

the

polarity

and

repetition

rate

of

the

applied

signals

enters

into

the

calculation.

The

following

general

precautions

should

be

observed

to

provide

the

best

display

when

using

the

ADD

mode:

1,

Do

not

exceed

the

input

voltage

rating

of

the

plug-in

units.

Operating

Instructions—7603/R7603

Operators

2.

Do

not

apply

large

signals

to

the

plug-in

inputs.

A

good

rule

to

follow

is

not

to

apply

a

signal

which

exceeds

an

equivalent

of

about

eight

times

the

vertical

deflection

factors.

For

example,

with

a

vertical

deflection

factor

of

0.5

volt/division,

the

voltage applied

to

that

plug-in

unit

should

not

exceed

4

volts.

Larger

voltages

may

result

in

a

distorted

display.

3.

To

ensure

the

greatest

dynamic

range

in

the

ADD

mode,

set

the

position

controls

of

the

plug-in

units

to

a

setting

which

would

result

in

a

mid-screen

display

if

viewed

in

the

LEFT

or

RIGHT

positions

of

the

VERT

MODE

switch.

4,

For

similar

response

from

each

channel,

set

the

plug-in

units

for

the

same

input

coupling.

Trigger

Source

The

TRIG

SOURCE

switch

allows

selection

of

the

internal

trigger

signal

for

the

time-base

unit.

For

most

applications,

this

switch

can

be

set

to

the

VERT

MODE

position.

This

position

is

the

most

convenient,

since

the

internal

trigger

signal

is

automatically

switched

as

the

VERT

MODE

switch

is

changed,

or

as

the

display

is

electronically

switched

between

the

left

vertical

and

right

vertical

plug-in

units

in

the

ALT

position

of

the

VERT

MODE

switch.

It

also

provides

a

usable

trigger

signal

in

the

ADD

or

CHOP

positions

of

the

VERT

MODE

switch,

since

the

internal

trigger

signal

in

these

modes

is

the

algebraic

sum

of

the

signals

applied

to

the

vertical

plug-in

units.

Therefore,

the

VERT

MODE

position

ensures

that

the

time-base

unit

receives

a

trigger

signal

regardless

of

the

VERT

MODE

switch

setting,

without

the

need

to

change

the

trigger

source

selection.

If

correct

triggering

for

the

desired

display

is

not

obtained

in

the

VERT

MODE

position,

the

LEFT

or

RIGHT

positions

can

be

used

to

obtain

the

trigger

signal

from

either

the

left

vertical

or

right

vertical

plug-in

unit.

The

internal

trigger

signal

is

obtained

from

the

selected

vertical

compartment,

whether

the

plug-in

unit

in

that

compartment

is

selected

for

display

on

the

CRT

or

not.

If

the

internal

trigger

signal

is

obtained

from

one

of

the

vertical

units,

but

the

other

vertical

unit

is

selected

for

display,

the

internal

trigger

signal

must

be

time-related

to

the

displayed

signal

in

order

to

obtain

a

triggered

(stable)

display.

X-Y

Operation

In

some

applications,

it

is

desirable

to

display

one

signal

versus

another

(X-Y)

rather

than

against

time

(internal

sweep).

The

flexibility

of

the

plug-in

units

available

for

use

with

the

7603

provides

a

means

for

applying

an

external

signal

to

the

horizontal

deflection

system

for

this

type

of

1-12

display.

Some

of

the

7B-series

time-base

units

can

be

operated

as

amplifiers

in

addition

to

their

normal

use

as

time-base

generators.

This

feature

allows

an

external

signal

to

provide

the

horizontal

deflection

on

the

CRT.

For

most

of

the

time-base

units

with

the

amplifier

function,

the

X

(horizontal)

signal

can

be

connected

either

to

an

external

input

connector

on

the

time-base

unit

or

it

can

be

routed

to

the

time-base

unit

through

the

internal

triggering

system

(see

time-base

instruction

manual

for

details).

If

the

latter

method

is

used,

the

TRIG

SOURCE

switches

must

be

set

so

that

the

X

(horizontal)

signal

is

obtained

from

one

of

the

vertical

units

and

the

Y

(vertical)

signal

is

obtained

from

the

other

vertical

unit.

The

advantages

of

using

the

internal

trigger

system

to

provide

the

X

signal

are

that

the

attenuator

switch

of

the

amplifier

unit

providing

the

horizontal

signal

determines

the

horizontal

deflection

factor

to

allow

full-range

operation

and

the

plug-in

units

do

not

have

to

be

moved

between

compartments

when

X-Y

operation

is

desired.

Another

method

of

obtaining

an

X-Y

display

is

to

instal!

an

amplifier

plug-in

unit

in

one

of

the

horizontal

plug-in

compartments

(check

amplifier

unit gain

as

given

in

the

plug-in

instruction

manual

to

obtain

calibrated

horizontal

deflection

factors).

This

method

provides

the

best

X-Y

display,

particularly

if

two

identical

amplifier

units

are

used,

since

both

the

X

and

Y

input

systems

will

have

the

same

delay

time,

gain

characteristics,

input

coupling,

etc.

For

further

information

on

obtaining

X-Y

displays,

see

the

plug-in

unit

manuals.

Also,

the

reference

books

listed

under

Applications

provide

information

on

X-Y

measurements

and

interpreting

the

resultant

lissajous

displays.

Intensity

Modulation

Intensity

(Z-axis)

modulation

can

be

used

to

relate

a

third

item

of

electrical

phenomena

to

the

vertical

(Y-axis)

and

the

horizontal

(X-axis)

coordinates

without

affecting

the

waveshape

of

the

displayed

signal.

The

Z-axis

modu-

lating

signal

applied

to

the

CRT

circuit

changes

the

intensity

of

the

displayed

waveform

to

provide

this

type

of

display.

‘‘Gray

scale’’

intensity

modulation

can

be

obtained

by

applying

signals

which

do

not

completely

blank

the

display.

Large

amplitude

signals

of

the

correct

polarity

will

completely

blank

the

display;

the

sharpest

display

is

provided

by

signals

with

a

fast

rise

and

fall.

The

voltage

amplitude

required

for

visible

trace

modulation

depends

upon

the

setting

of

the

INTENSITY

control.

A

two-volt

peak-to-peak

signal

will

completely

blank

the

display

even

at

maximum

intensity

levels.

Lower

amplitude

signals

can

be

used

to

only

change

the

trace

brightness

rather

than

completely

blank

the

display.

Negative-going

modulating

signals

increase

the

display

intensity

and

positive-going

modulating

signals

decrease

the

display

intensity.

Useful

input

frequency

range

is

DC

to

10

megahertz

(input

voltage

derating

necessary

above

two

megahertz).

The

maximum

input

voltage

should

be

limited

to

10

volts

(DC

plus

peak

AC}.

‘

>,

eS

Time

markers

applied

to

the

EXT

Z

AXIS

input

connector

provide

a

direct

time

reference

on

the

display.

With

uncalibrated

horizontal

sweep

or

external

horizontal

mode

operation,

the

time

markers

provide

a

means

of

reading

time

directly

from

the

display.

However,

if

the

markers

are

not

time-related

to

the

displayed

waveform,

a

single-sweep

display

should

be

used

(for

internal

sweep

only)

to

provide

a

stable

display.

Raster

Display

A

raster-type

display

can

be

used

to

effectively

increase

the

apparent

sweep

length.

For

this

type

of

display,

the

trace

is

deflected

both

vertically

and

horizontally

by

sawtooth

signals.

This

is

accomplished

in

the

7603

by

installing

a

7B-series

time-base

unit

in

one

of

the

vertical

plug-in

compartments.

Normally,

the

time-base

unit

in

the

vertical

compartment

should

be

set

to

a

slower

sweep

rate

than

the

time-base

unit

in

the

horizontal

compartment;

the

number

of

horizontal

traces

in

the

raster

depends

upon

the

ratio

between

the

two

sweep

rates.

Information

can

be

displayed

on

the

raster

using

several

different

methods.

In

the

ADD

position

of

the

VERT

MODE

switch,

the

signa!

from

an

amplifier

unit

can

be

algebraically

added

to

the

vertical

deflection.

With

this

method,

the

vertical

signal

amplitude

on

the

CRT

should

not

exceed

the

distance

between

the

horizontal

lines

of

the

raster.

Another

method

_of

displaying

information

on

the

raster

is

to

use

the

EXT

2

AXIS

input

to

provide

intensity

modulation

of

the

display.

This

type

of

raster

display

could

be

used

to

provide

a

television-type

display.

Complete

information

on

operation

using

the

Z-axis

feature

is

given

under

Intensity

Modulation.

To

provide

a

stable

raster

display,

both

time-base

units

must

be

correctly

triggered.

Internal

triggering

is

not

provided

for

the

time-base

units

when

they

are

in

the

vertical

compartments;

external

triggering

must

be

used.

Also,

blanking

is

not

provided

from

the

time-base

units

when

they

are

installed

in

a

vertical

compartment.

To

blank

out

the

retrace

portion

from

the

time-base

unit

in

the

vertical

compartment,

special

connections

must

be

made

from

this

time-base

unit

to

the

blanking

network

of

the

7603.

If

this

mode

of

operation

is

desirable,

contact

your

local

TEKTRONIX

Field

Office

or

representative

for

specific

information

on

obtaining

blanking

with

the

specific

time-base

unit

being

used

in

the

vertical

compartment.

Calibrator

General.

The

internal

calibrator

of

the

7603

provides

a

convenient

signal

source

for

checking

basic

vertical

gain

and

for

adjusting

probe

compensation

as

described

in

the

probe

instruction

manual.

In

addition,

the

calibrator

can

be

used

"as

a

convenient

signal

source

for

application

to

external

equipment.

®

Operating

Instructions—7603/R7603

Operators

Voltage.

The

calibrator

provides

accurate

output

voltage

of

40

millivolts,

0.4

volt,

and

4

volts

at

the

three

front-panel

pin-jack

connectors

into

high-impedance

loads.

Output

resistance

is

approximately

50

ohms

at

the

40

mV

and

0.4

V

jacks

and

approximately

450

ohms

at

the

4

V

jack.

Current,

A

40-milliampere,

one-kilohertz

output

current

is

provided

when

the

optional

current-loop

accessory

(TEKTRONIX

Part

No.

012-0259-00)

is

connected

between

the

4V

pin-jack

and

ground.

This

output

can

be

used

to

check

and

calibrate

current-measuring

probe

systems.

Waveshape.

The

square-wave

output

signal

of

the

cali-

brator

can

be

used

as

a

reference

waveshape

when

checking

or

adjusting

the

compensation

of

passive,

high-resistance

probes.

Since

the

square-wave

output

from

the

calibrator

has

a

flat

top,

any

distortion

in

the

displayed

waveform

is

due

to

the

probe

compensation,

DC

voltage

output

is

also

available

by

changing

a

jumper

on

the

calibrator

board:

see

Fig.

1-5,

Signals

Out

Vertical

Signal.

The

VERT

SIG

OUT

connector

provides

a

sample

of

the

vertical

deflection

signal.

The

source

of

the

output

signal

is

determined

by

the

TRIG

SOURCE

switch.

The

source

will

follow

the

setting

of

the

TRIG

SOURCE

switch.

When

the

TRIG

SOURCE

is

in

the

VERT

MODE

the

output

will

follow

the

VERTICAL

MODE

switch

except

CHOP,

then

the

signals

are

ADDED.

The

output

signals

are

LEFT,

ALT,

ADD

and

RIGHT.

The

Place

jumper

here

for

one-

Fig.

1-5.

Jumper

locations

for

DC

and

one-kilohertz

Calibrator

operation

(Calibrator

board).

Operating

Instructions—7603/R7603

Operators

output

signal

into

50

ohms

is

about

25

millivolts/division

of

the

vertical

signal

displayed

on

systems

CRT.

The

output

signal

into

1

megohm

is

about

0.5

volts/division

of

the

vertical

signal

displayed

on

the

systems

CRT.

+

Gate.

The

+

gate

connector

provides

a

sweep

gate

signal

that

is

generated

by

the

time

base

plug-in

unit.

The

gate

selector

switch

provides

three

gates

MAIN,

AUXILIARY

and

DELAY.

The

duration

of

the

gate

pulse

is

determined

by

the

respective

sweep.

Auxiliary

and

Delay

gates

can

only

be

produced

by

dual

sweep

time

base

plug-in

units.

The

amplitude

of

the

gate

signal

is

about

50

millivolts

into

50

ohms

or

10

volts

into

1

megohm.

+

Sawtooth.

The

+

sawtooth

connector

provides

a

posi-

tive

going

sample

of

the

sawtooth

from

the

time

base

unit

in

the

horizontal

compartment.

The

rate

of

rise

of

the

saw-

tooth

signal

is

about

50

millivolts/unit

of

time

into

50

ohms

or

1

volt/unit

of

time

into

1

megohm.

Unit

of

time

is

deter-

mined

by

the

time/division

switch

of

the

horizontal

plug-in

unit.

Applications

The

7603

Oscilloscope

and

its

associated

plug-in

units

provide

a

very

flexible

measurement

system.

The

capa-

bilities

of

the

overall

system

depend

mainly

upon

the

plug-in

units

that

are

chosen

for

use

with

this

instrument.

Specific

applications

for

the

individual

plug-in

units

are

described

in

the

plug-in

manuals.

The

overall

system

can

also be

used

for

many

applications

which

are

not

described

in

detail

either

in

this

manual

or

in

the

manuals

for

the

individual

plug-in

units.

Contact

your

local

TEKTRONIX

Field

Office

or

representative

for

assistance

in

making

specific

measurements

with

this

instrument.

The

following

books

describe

oscilloscope

measurement

techniques

which

can

be

adapted

for

use

with

this

instrument.

John

D.

Lenk,

‘Handbook

of

Oscilloscopes,

Theory,

and

Application”,

Prentice-Hall

Inc.,

Englewood

Cliffs,

New

Jersey,

1968.

J.

Czech,

‘Oscilloscope

Springer-Verlag,

New

York,

1965.

Measuring

Techniques’,

1-14

J.

F.

Golding,

“Measuring

Oscilloscopes’,

Transatlantic

Arts,

Inc.,

1971.

Charlies

H.

Roth

Jr.,

“Use

of

the

Oscilloscope’,

A

Programmed

text,

Prentice-Hall

Inc.,

Englewood

Cliffs,

New

Jersey,

1970.

REPACKAGING

FOR

SHIPMENT

lf

the

Tektronix

instrument

is

to

be

shipped

to

a

Tektronix

Service

Center

for

service

or

repair,

attach

a

tag

showing:

owner

(with

address)

and

the

name

of

an

individual

at

your

firm

that

can

be

contacted,

complete

instrument

serial

number

and

a

description

of

the

service

required.

Save

and

re-use

the

package

in

which

your

instrument

was

shipped.

if

the

original

packaging

is

unfit

for

use

or

not

available,

repackage

the

instrument

as

follows:

1.

Obtain

a

carton

of

corrugated

cardboard

having

inside

dimensions

of

no

less

than

six

inches

more

than

the

instrument

dimensions;

this

will

allow

for

cushioning.

Refer

to

the

following

table

for

carton

test

strength

requirements.

2.

Surround

the

instrument

with

polyethylene

sheeting

to

protect

the

finish

of

the

instrument.

3.

Cushion

the

instrument

on

all

sides

by

tightly

packing

dunnage

or

urethane

foam

between

carton and

instru-

ment,

allowing

three

inches

on

all

sides.

4.

Seal

carton

with

shipping

tape

or

industrial

stapler.

SHIPPING

CARTON

TEST

STRENGTH

Gross

Weight

(Ib}

Carton

Test

Strength

(Ib)

0-10

200

10-30

275

30-120

375

120-140

500

140-160

600

REV.

B,

OCT.

1976

ooh,

Section

2—7603/R7603

Operators

SPECIFICATION

Information

given

in

this

manual

applies

to

the

R7603

ments.

The

following

electrical

characteristics

apply

over

an

Oscilloscope

also,

unless

otherwise

indicated.

The

R7603

is

ambient

temperature

range

of

O°C

to

+50°C,

except

as

electrically

identical

to

the

7603,

but

it is

adapted

for

mounting

in

a

standard

19-inch

rack.

Rackmounting

instructions

and

a

dimensional

drawing

for

the

R7603

are

given

in

Section

3.

otherwise

indicated.

Warmup

time

for

given

accuracy

is

20

minutes.

NOTE

Many

of

the

measurement

capabilities

of

this

This

instrument

will

meet

the

following

electrical

specifi-

instrument

are

determined

by

the

choice

of

plug-in

cations

after

complete

calibration

as

given

in

Section

5.

The

units.

The

following

characteristics

apply

to

the

7603

Operating

Checkout

procedure

which

is

given

in

Section

1

Oscilloscope

only.

See

the

System

Specification

at

provides

a

convenient

method

of

checking

instrument

the

end

of

this

section

for

specifications

of

the

performance

without

making

internal

checks

or

adjust-

complete

system.

VERTICAL

DEFLECTION

SYSTEM

Characteristic

Performance

Requirements

Supplemental

Information

Deflection

Factor

Compatible

with

all

7000-series

plug-in

units,

Between

Compartments

Within

1%.

Low

Frequency

Linearity

0.1.

division

or

less

compression

or

expansion

of

a

center-screen

2

division

signal

when

positioned

anywhere

vertically

within

the

graticule

area.

Bandwidth

See

system

specifications

for

7000-series

instruments.

Step

Response

Risetime

See

system

specifications

for

7000-series

instruments,

Isolation

Between

Vertical

At

least

100:1

from

DC

to

100

MHz.

|

Compartments

|

Delay

Line

|

Permits

viewing

leading

edge

of

trigger

signal.

Chopped

Mode

Repetition

Rate

1

MHz

within

20%.

2-1

Specification~7603/R7603

Operators

VERTICAL

DEFLECTION

SYSTEM

(cont)

Characteristic

Performance

Requirements

Supplemental

Information

Time

Segment

From

Each

Compartment

0.4

to

0.6

us.

Difference

In

Delay

Between

Vertical

Compartments

0.5

ns or

less.

Vertical

Display

Modes

LEFT:

Left

vertical

unit

only.

ALT:

Dual

trace,

alternate

between

ver-

tical

units.

ADD:

Added

algebraically.

CHOP:

Dual

trace,

chopped

between

ver-

tical

units.

RIGHT:

Right

vertical

unit

only.

Selected

by

VERT

MODE

switch.

TRIGGERING

Characteristic

Performance

Requirements

Supplemental

Information

Trigger

Source

LEFT

VERT:

From

left

vertical

only.

VERT

MODE:

Determined

by

vertical

mode.

RIGHT

VERT:

From

right

vertical

only.

Selected

by

TRIGGER

SOURCE

switch.

HORIZONTAL

DEFLECTION

SYSTEM

Characteristic

Performance

Requirements

Supplemental

Information

Fastest

Calibrated

Sweep

Rate

5

ns/div.

Deflection

Factor

Compatible

with

all

7000-series

plug-in

units.

Low

Frequency

Linearity

0.1

div

or

less

compression

or

expansion

of

a

center-screen

2

div

signal

when

positioned

anywhere

horizontally

within

the

graticule

area.

Phase

Shift

Between

The

Vertical

and

Horizontal

Amplifiers

Less

than

2°

from

DC

to

35

kHz.

Frequency

Response

Bandwidth

(8

div

Reference)

At

least

2

MHz.

2-2

Tektronix 7603 User manual

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