Tektronix 7603 Manuale utente



REV

JUNE,

1976

TABLE

CONTENTS

7603/R7603

Service

Page Page

SECTION

OPERATING

INSTRUCTIONS

SECTION

CIRCUIT

DESCRIPTION

Preliminary

Information

1-1

Block

Diagram

4-1

Display

Definitions

1-2

Circuit

Operation

4-1

Plug-in

Units

1-3

Logic

Fundementals

4-3

Controls

and

Connectors

1-3

Main

Interface

4-6

Operating

Checkout

1-3

Logic

Circuit

4-6

Simplified

Operating

Instructions

1-7

Trigger

Selector

4-16

General

Operating

Information

1-9

Vertical

Interface

4-19

Vertical

Amplifier

4-20

SECTION

SPECIFICATION

Horizontal

Amplifier

4-21

Vertical

Deflection

System

2-1

Calibrator

and Front

Panel

Triggering

2-2

Switching

4-23

Horizontal

Deflection

System

2-2

CRT

Circuit

4-24

Calibrator

2-3

Low-Voltage

Power

Supply 4-27

External

Axis

Input

2-3

Signal

Out

Board

4-31

Outputs

2-3

Readout

System

4-31

Character

Generator

2-4

SECTION

MAINTENANCE

Display

(CRT)

and Options

2-4

Power

Source

2-5

Preventive

Maintenance

5-1

Signals

Out

2-5

Troubleshooting

5-2

Environmental

2-6

Location

Circuit

Boards

5-4,5-5

Physical

2-6

Electrode

Configuration

for

Standard

Accessories

2-6

Semiconductors

5-7

7600-Series

System

Specifications

2-7

Corrective

Maintenance

5-10

SECTION

CALIBRATION

SECTION

RACKMOUNTING

Test

Equipment

Required

3-1

Instrument

Dimensions

6-1

Calibration

Procedure

3-4

Rack

Dimensions

6-1

Power

Supply

3-5 Slide-Out

Tracks

6-1

Display

and

Z-Axis

3-6

Mounting

Procedure

6-1

Vertical

Deflection

System

3-9

Triggering

System

3-12

SECTION

ELECTRICAL

PARTS

LIST

Horizontal

Deflection

System

3-13

SECTION8

DIAGRAMS

and

CIRCUIT

BOARD

Z-Axis

and

Auto

Focus

System

3-15

ILLUSTRATIONS

Calibrator

3-16

Signals

Out

3-17

SECTION

MECHANICAL

PARTS

LIST

Readout

Operation 3-18

Readout

Gate

Trig'd

Operation 3-18

CHANGE

INFORMATION

7603

Features

The

TEKTRONIX

7603

Oscilloscope

solid

state,

light

weight

instrument

designed

for

general-purpose

measuring

applications

This

instrument

has

three

plug-in

compartments

that

TEKTRONIX

7-series

plug-in

units

form

complete

measurement

system

Thetwo

plug-in

compartments

the

left

are

connected

to the

vertical

deflection

system

The

right

plug-in

compartment

connected

the horizontal

deflection

system

Electronic

switching

between

the

vertical

plug-in

compartments

allows

multi-trace

vertical

display

The

flexibility

this

plug-in

feature

and

the

variety

plug-in

units

available

allow

this

system

used

for

many

measurement

applications

addition, the

instrument

contains

readout

system

provide

CRT

display

alphanumeric

information

from

the

plug-in

units

Data

such

deflection

factor,

sweep

rate,

etc

can

encoded

and

displayed

the

CRT

This

instrument

features

large-screen,

division display

;

each

division

equals

.22

centimeters

The

CRT

provides

small

spot

size

and

fast

writing

speed

Regulated

power

supplies

assure that

performance

not

affected

variations

line

voltage

and

frequency,

changes

the

load

due

to the

varying

power

requirements

of the

plug-in

units

Maximum

power

consumption

about

170

watts

(60

hertz,

115-volt

line)

7603/137603

General

OPERATING

INSTRUCTIONS

effectively

use

the

7603,

the

operation

and

capabilities

of the

instrument

must

known

This

section

describes

the

operation

the

front-

and

rear-panel

controls

and

connectors

and

gives

simplified

and

general

operating

information

PRELIMINARY

INFORMATION

OperatingVoltage

WARNING

This

instrument

designed

for

operation

from

power

source

with

its

neutral at

near

earth

(ground)

potential with a separate

safety-earth

conductor

not

intended

for

operation

from

two

phases

multi-phase

system,

across the

legs

single-phase,

three-wire

system

The7603

can

operated

from

either

a 110-volt or

220-volt

nominal

line-voltage

source

addition,

three

operating

ranges can be

selected

within

each

nominal

line

voltage

source

The

voltage-selector

jumper

the

Rectifier

board

(see

Fig

1-1)

allows

selection

the

operating

voltage

convert

the

instrument

from

one

regulating

range

another,

first

disconnect

the

instrument

from

the

power

source

Then,

slide

out

the

power

unit

described

the

Maintenance

section

Remove

the

voltage-selector

jumper

and

re-install

the

set

of pins

which

represent

the desired

regulating

range

Select

range

which

centered

about

the average

line

voltage

which

the

instrument

to be

connected

(see

Table

1-1)

TABLE

1-1

Regulating

Range

and

Fuse Data

convert

from

110-volts

220-volts

nominal

line

voltage,

vice versa,

remove

the

voltage-selector

jumper

and

replace

with

the spare

jumper

(stored

pins

adjacent

voltage

selector

area)

The

jumpers

are

color-

REV

NOV

197

Section

1-7603/R7603

Service

Fig

1-1

Locations

voltage-selector

jumper,

spare

jumper,

and

ALT

FUSE

power

unit

(7603

shown)

coded

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

provide

protection

for

the

selected

nominal

line

voltage

Use

the

fuse

located

the

ALT

FUSE

holder

the

Rectifier

board

(see

Fig

1-1)

see

Table

1-1

for

value

Also,

change

the

line-cord

plug

match

the

power-source

receptacle

use

suitable

adapter

Power

Cord

Conducto

Ident

ification

The

7603

designed

used

with

three-wire

power

system

three-

two-wire

adapter

used

connect

this

instrument

two-wire

power

system, be

sure

connect

the

ground

lead

of the

adapter

earth

(ground)

Failure

complete

the

ground

system

may

allow

the

chassis

this

instrument

elevated

above

ground

potential

and

pose

shock

hazard

Operating

Temperature

The 7603

can

operated

where

the

ambient

air

temperature

between

O'C

and

+50

This

instrument

Conductor

Color

Alternate

Color

Ungrounded

(Line)

Brown

Black

Grounded

(Neutral)

Blue

White

Grounding

(Earthing)

Green-Yellow Green-Yellow

Pins

Regulating

Range

Selected

110-volts

nominal

220-volts

nominal

LOW

110

volts

180

220

volts

MED

to 121

volts

198

242

volts

108

132

volts

218

262

volts

Line Fuse

slow-blow

Operating

Instructions-7603/R7603

Service

can

be stored

ambient

temperatures

between

-55

and

+75

After

storage

temperatures

beyond

the

operating

limits,

allow

the

chassis

temperature

come

within

the

operating

limits

before

power

applied

The

7603

cooled

convection

air

flow

through the

instrument

Components

which

require

the

most

cooling

are

mounted

externally

heat

radiator at

the

rear

Adequate

clearance

must

provided

all

sides

allow

heat to

dissipated

from

the

instrument

not block

restrict

the

air

flow through

the

holes

the

cabinet

the

heat

radiator

the

rear

Maintain

the

clearance

provided

the

feet

the

bottom

and

allow

about

two

inches

clearance

the

top,

sides,

and

rear

(more

possible)

The

R7603

cooled

air

drawn

through

the

air

filter

the

rear

panel

and

blown

out through

the

holes

the

right

side

Adequate

clearance

must

provided

these

locations

Allow

least

one and

one-half inches

clearance

behind

the

air

filter

and

at least

one

inch

the

right

side

thermal cutout

this

instrument

provides

thermal

protection

and

interrupts

the

power

the

instrument

the

internal

temperature

exceeds

safe

operating

level

Power

automatically

restored

when

the

temperature

returns

safe level

Operation

confined

areas

proximity

heat-producing

instruments

may

cause

the

thermal cutout

open

frequently

Operating

Position

bale-type

stand

mounted

the

bottom

this

instrument

This

stand

permits

the

7603

tilted

about 10

for

convenient

viewing

Rackmounting

Instructions

and

dimensional drawings

for

rackmounting

the

R7603

are

located

Section

the

service

manual

General

DISPLAY

DEFINITIONS

The

following

definitions

describe

the

types

displays

which

can

obtained

with

7603

Oscilloscope

system

with

real-time

amplifiers,

time-base

units, or

combinations

these

Use

special

purpose

plug-in

units

may

result

different

types

displays,

which

are

defined

the

instruction

manuals

for

these

special

units

The

following

terminology

will

used

throughout

this

manual

Alternate

Mode

time-sharing

method

displaying

two

signals

with

single

cathode-ray

tube

beam

Channel

switching

sequential

and

occurs

the end

each

sweep

Chopped

Mode

time-sharing

method

of displaying

two

signals

with

single

cathode-ray

tube

beam

Channel

switching

sequential

and

occurs

rate

determined by an

internal

clock generator

(chopping

rate)

NOTE

See

Simplified

Operating

Instructions

in this

section

for

set-up

information

obtain

each of

the following

displays

Single

Trace

display

single

plot

produced

one

vertical signal

andone

sweep

Dual

Trace

display

two

plots

produced

two

vertical

signals

and one

sweep

Delayed

Sweep

Single

Trace

display

single

plot

produced

one

vertical

signal

and

delayed

sweep

Two

sweeps

are

used

produce

this

display

;

the

sweeps

are

operating

with

delaying/delayed

relationship

where

one

sweep

(identified

the

delaying

sweep) delays

the

start

the

second

sweep

(identified

the

delayed

sweep)

Delayed

Sweep

Dual

Trace

display

two

plots

produced

combining

two

vertical signals

and

delayed

sweep

Two

sweeps

are

used

produce

this

display

;

the

sweeps

are operating

with a

delaying/delayed

relationship

Each

vertical

signal

displayed

against

the

delayed

sweep

X-Y

plot

two

variables,

neither

which

represents

time

refers

the

horizontal

axis

and

refers

the

vertical

axis

General

Plug-In

Installation

REV

MAR

1975

PLUG-IN

UNITS

The

7603

designed

three

TEKTRONIX

7-series

plug-in

units

This

plug-in

feature

allows

variety

display

combinations and

also

allows

selection

band-

width,

sensitivity,

display

mode,

etc

meet

the

measure-

ment

requirements

addition,

allows

the

oscilloscope

system

expanded

meet

future

measurement

requirements

The

overall

capabilities

the

resultant

system

are

large

part

determined by

the

characteristics

the

plug-in

selected

For

complete

information

plug-ins

available

for use

with

this

instrument,

see

the

current

Tektronix,

Inc

catalog

install

plug-in

unit

into

one

the

plug-in

compartments,

align

the

slots

the

top

and

bottom

the

plug-in

with

the

associated

guide

rails

the

plug-in

compartment

Push the

plug-in

unit firmly into

the

plug-in

compartment

until

locks

into

place

remove

plug-in,

pull

the

release

latch

the

plug-in

unit

disengage

and

pull

the

unit

out

the

plug-in

compartment

Plug-in

units

can

removed

installed

without

turning

off the

instrument

power

It is

not

necessary

that

all

the

plug-in

compartments

filled

operate

the

instrument

;

the

only

plug-in

units

needed

are

those

required

for

the

measurement

made

However,

environmental

extremes,

excess

radiation

may

radiated

into

out

this

instrument

through

the

open

plug-in

compartments

Blank

plug-in

panels

are

available

from

Tektronix,

Inc

cover

the

unused

compartment

;

order

TEKTRONIX

Part

016-0155-00

When

the

7603

calibrated

accordance

with

the

calibration

procedure

given

in this

instruction

manual, the

vertical

and

horizontal gain

are

standardized

This

allows

calibrated

plug-in

units

to be

changed

from

one

plug-in

compartment

another

without

recalibration

However,

the

basic

calibration

the

individual

plug-in

units

should

checked

when

they

are

installed

this

system

verify

their

measurement

accuracy

See

the

operating

instructions

section

the

plug-in unit

instruction

manual

for

verifi-

cation

procedure

Special

purpose

plug-in

units

may

have

specific

restric-

tions

regarding

the

plug-in

compartments

which

they can

installed

This

information

will

given

the

instruc-

tion

manual

for

these

plug-in

units

NOTE

Laterproduction of

rackmount

oscilloscopes

are

pro-

vided

with

support

posts

between

the

individual

plug-

compartments

post or

posts

must

removed

a multiwidth

plug-in

installed

remove

post,

unfasten

the

screws

that

secure

the

top

and

bottom

the

plug-in

housing

The

major

controls

for

operation

the

7603

are

located

on the

front

panel

the

instrument

Figs

1-2

and

1-3

provide

brief

description

each

control

and connector

detailed

operating information

given

under

General

Operating

Information

General

CONTROLS

AND

CONNECTORS

The

following

Operating

Checkout

provides

means

verifying

instrument

operation

and

basic

calibration

with-

out removing

the covers

making

internal

adjustments

Since

demonstrates

the use

all

controls

and

connec-

tors,

can

also

used to

provide

basic

training

the

operation

this

instrument

re-calibration

the

7603

appears

necessary,

see

the

Calibration

procedure

Section

this

manual

re-calibration

plug-in

unit

indicated,

see the

instruction

manual

for the

appropriate

plug-in

unit

Set-Up

Information

Operating

Instructions-7603/R7603

Service

OPERATING

CHECKOUT

Set

the

front-panel

controls

follows

INTENSITY

Counterclockwise

FOCUS



Midrange

BEAM

FINDER



Pressed

GRATICULE

ILLUM



desired

VERT

MODE



LEFT

TRIG

SOURCE



VERT

MODE

POWER



Pushed

Connect

the

7603

power

source

which

meets

the

voltage

and frequency

requirements

this

instrument

The

applied

voltage

should

near

the center

the

voltage

range

marked

the

rear

panel

(see

Operating

Voltage

this

section

for

information

converting

this

instrument

from

one

operating

voltage

another)

Install

TEKTRONIX

7A-series amplifier

units

into

both the

left

and

right

vertical

plug-in

compartments

Install

7B-series

time-base

unit

into

the

horizontal

compartment

Pull

the

POWER

switch

to turn

the

instrument

Allow

several

minutes

warmup

before

proceeding

Set

both

vertical

units

for

deflection

factor

two

volts/division

and

center

the

vertical

position controls

Set

both

vertical

units

for

input

coupling

Set

the time-base

unit

for

sweep

rate

one

millisecond/division

the

auto,

internal trigger

mode

Operating

Instructions-7603/R7603

Service

FUNCTIONS

CONTROLS

AND

CONNECTORS

Front

Panel

POWER-

Switch

Controls

power

the

instrument

INTENSITY-Controls

brightness of

the

display

Control

inoperative

when

horizontal

compartment

vacant

READOUT-Turns

the

readout

display

and

controls

the

readout

intensity

FOCUS-Provides

adjustment

for

optimum

display

definition

GRATICULE

ILLUM-Controls

graticule

illumination

BEAM

FINDER-When

pressed,

the

scan

limited

within

the

graticule

area

TRIG

SOURCE-Selects

source

internal

trigger

signal

for

the

time

base

plug-in

the

horizontal

compartment

LEFT

The

trigger

signal

obtained

from

the

plug-in

unit

the

left

vertical

compartment

only

VERT

MODE

Trigger

signal

automatically

follows

the

vertical

display

except

CHOP

and

ADD

;

then

the

trigger

signal

the

algebraic

sum

the

signals

from

the

left

and

right

vertical

compartments

RIGHT

The

trigger

signal

obtained

from

the

plug-in

unit

the

right

vertical

compartment

only

Fig

1-2

Front-panel

controls

and

connectors

Light

Indicates

that

the

power

switch

on and

that

the

instrument

connected

a line

voltage

source

CALIBRATOR-Calibrator

output

jacks

V, 0

V, 40

mV,

ground)

Positive-going

pulse

voltage

selected

changing

internal

jumper

Repetition

rate

approximately

one

kilohertz

VERT

MODE-Selects

vertical

mode

operation

LEFT

Signals

from

plug-in

unit

left

vertical

compartment

are

displayed

ALT

Signals

from

plug-in

units

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

both

the

left

and

right

vertical

compartments

are

algebraically

added and

the

sum

displayed

the

CRT

CHOP

Signals

from

plug-in

units

both

the

left

and

right

vertical

compartments

are

displayed

(dual

trace)

The

display

switched

between

vertical

plug-in

units

approximately

one

megahertz

rate

RIGHT

Signals

from

plug-in

unit

right

vertical

compart-

ment

displayed

Camera

Power

(Not

Labeled)

-Three-pin

connector

CRT

bezel

provides

power

output

(+15

Receives

remote

single

sweep

reset

signal

from

compatible

camera

systems,

and

ground

connection

Rear

Panel

FUSE-Line

voltage

fuse

for

instrument



READY

OUT-Provides

external

single

sweep

ready

indicator

signal

after

the

single

sweep

has

been

reset

EXT

S S

RESET

IN-Remote

single

sweep

reset

EXT

AXIS

IN-Input

connector

for intensity

modulation

the

CRT

display

VERT

SIG

OUT-Vertical

signal

selected

TRIG

SOURCE

switch

(LEFT,

RIGHT,

ALT

and

ADD)

GATE

OUT-Gate

signal

selected

gate

selector

switch

(MAIN,

AUXILIARY,

and

DELAY)

SAWTOOTH

OUT-Positive-going

sawtooth

from

time-base

unit

Fig

Rear-panel

controls

and

connectors

Operating Instructions-7603/137603

Service

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