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

OE

Be

ee

oeee

beanies:

Sodrea

.

RR

TRI

OES

See

poh

shane

POLaRHTY

mae.

ue

t

Riiaviny

BS

ga

oud

Smo

y

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

SS

aay

our

Sao

LOA

SLOW

200-240V

RANGE

REMOTE-ERASE

IN

reg)

Jee

ALTERNATE

FUSE-INSIOE

VERT

SIG

OUT

MAIN

AUNILIARY

©

oy

BELAY

\seweor

|

Z

ARIS

TN

WY

MAN

<a

BOO

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

.

Tektronix 7603 User manual

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