Tektronix 7844 User manual

Tektronix

COMMITTED

EXCELLENCE

PLEASE

CHECK

FOR

CHANGE

INFORMATION

THE

REAR

THIS

MANUAL.

7844/R7844

DUAL-BEAM

OSCILLOSCOPE

WITH

OPTIONS

OPERATOR

INSTRUCTION

MANUAL

Tektronix,

Inc.

P.O.

Box

500

Beaverton,

Oregon

97077

Serial

Number

070-1675-00

First

Printing

AUG

1974

Product

Group

Revised

NOV

1981

1974

Tektronix,

Inc.

All

rights

reserved.

Contents

this

publication

may

not

reproduced

any

form

without

the

written

permission

Tektronix,

Inc.

Products

Tektronix,

inc.

and

its

subsidiaries

are

covered

U.S.

and

foreign

patents

and/or

pending

patents.

TEKTRONIX,

TEK,

SCOPE-MOBILE,

and

are

registered

trademarks

Tektronix,

Inc.

TELEQUIPMENT

registered

trademark

Tektronix

U.K.

Limited.

Printed

U.S.A.

Specification

and

price

change

privileges

are

reserved.

INSTRUMENT

SERIAL

NUMBERS

Each

instrument

has

serial

number

parel

insert,

tag,

stamped

the

chassis.

The

first

number

letter

designates

the

country

manufacture.

The

last

five

digits

the

serial

number

are

assigned

sequentially

and

are

unique

each

instrument.

Those

manufactured

the

United

States

have

six

unique

digits.

The

country

manufacture

identified

follows:

B000000

Tektronix,

Inc.,

Beaverton,

Oregon,

USA

100000

Tektronix

Guernsey,

Ltd.,

Channel

Islands

200000

Tektronix

United

Kingdom,

Ltd.,

London

300000

Sony/Tektronix,

Japan

700000

Tektronix

Holland,

NV,

Heerenveen,

The

Netherlands

7844/R7844

Operators

TABLE

CONTENTS

PAGE

List

illustrations

iti

List

Tables

ili

SECTION

OPERATING

INSTRUCTIONS

FEATURES

1-1

PRELIMINARY

OPERATION

1-1

Safety

Information

1-1

Operating

Voltage

Operating

Temperature

1-2

Operating

Position

1-2

PLUG-IN

UNITS

1-2

Installation

Plug-In

Units

1-2

CONTROLS

AND

CONNECTORS

1-2

Front-Panel

Color

Coding

1-2

FAMILIARIZATION

PROCEDURE

1-2

Set-Up

Information

1-3

Display

Controls

1-3

Vertical

System

and

Calibrator

7-8

Horizontal

System

1-9

Graticule

and

Readout

Pulsed

Operation

7-10

DETAILED

OPERATING

INFORMATION

1-11

Crt

Display

Intensity

Controls

1-11

Display

Focus

1-17

Trace

Alignment

1-12

Graticule

1-12

Light

Filters

1-12

Graticule

Illumination

4-12

Readout

Display

1-12

Beamfinder

1-13

Control

Hlumination

1-14

Calibrator

Output

1-14

Probe

Power

4-14

Horizontal

Display

Mode

Combinations

1-14

Vertical

Display

Mode

Combinations

1-14

Beam

Display

Characteristics

1-14

Amplifier

Unit

Alternate

Operation

1-15

7844/R7844

Operators

TABLE

CONTENTS

(CONT.)

PAGE

SECTION

(continued)

Trigger

Source

1-15

Intensity

Modulation

1-15

Remote

Grat/Readout

Single

Shot

1-15

Single

Sweep

Input/Output

1-15

Output

Signals

1-16

Display

Photography

1-16

APPLICATIONS

1-16

Vertical

Amplifier

Plug-In

Units

1-17

Time-Base

Plug-In

Units

1-17

Sampling

Displays

1-17

Special

Purpose

Plug-In

Units

1-18

X-Y¥

Operation

1-18

Raster

Display

1-19

SECTION

SPECIFICATION

INTRODUCTION

2-1

SYSTEM

ELECTRICAL

SPECIFICATION

2-9

STANDARD

ACCESSORIES

2-12

SECTION3

RACKMOUNTING

INSTRUCTIONS

INTRODUCTION

3-1

INSTRUMENT

DIMENSIONS

3-1

RACK

DIMENSIONS

3-1

Height

3-1

Width

3-1

Depth

3-1

SLIDE-OUT

TRACKS

3-1

MOUNTING

PROCEDURE

3-2

REMOVING

INSTALLING

THE

INSTRUMENT

3-3

SLIDE-OUT

TRACK

LUBRICATION

3-3

SECTION4

INSTRUMENT

OPTIONS

INTRODUCTION

OPTION

4-1

OPTION

4-7

7844/R7844

Operators

TABLE

CONTENTS

(CONT.)

SECTION

(continued)

OPTION

Controls

and

Connectors

Display

Photography

CHANGE

INFORMATION

FIGURE

NO.

4-1

1-2

4-3

1-4

2-1

3-1

3-2

3-3

3-4

3-5

3-6

4-1

TABLE

NO.

2-4

2-2

2-3

2-4

2-5

2-46

4-1

LIST

ILLUSTRATIONS

Frontispiece

Front-panel

controls

and

connectors.

Rear-panel

controls

and

connectors.

Definition

measurement

lines

the

7844/R7844

graticule,

Location

readout

display

the

crt

identifying

the

originating

plug-in

and

channel.

7844

dimensional

drawing.

Stide-out

track

assembly.

Vertical

mounting

position

the

stationary

section

and

location

the

thumb

screw

securing

hole

(left

stationary

section

shown).

Details

for

mounting

stationary

sections.

Installing

and

removing

the

instrument.

Adjustment

the

slide-out

tracks

for

smooth

sliding

action.

R7844

dimensional

drawing.

Location

Readout

Mode

Switch

the

Readout

circuit

board.

LIST

TABLES

Electrical

7844/R7844

Oscilloscope

System

Vertical

Specification

7844/R7844

Oscilloscope

System

Horizontal

Specification

Special

Purpose

and

Sampling

Plug-in Units

Environmental

Physical

Option

Information

Locator

PAGE

2-4

2-9

2-10

2-11

4-3

ili

7844/R7844

Operators

7844

DUAL-BEAM

OSCILLOSCOPE

R7844

OPTION

DUAL-BEAM

OSCILLOSCOPE

1675-12

Section

1-7844/R7844

Operators

OPERATING

INSTRUCTIONS

FEATURES

The

Tektronix

7844/R7844

Dual-Beam

Oscilloscope

solid-state,

wide

bandwidth,

dual-beam

oscilloscope.

The

instrument

accepts

Tektronix

7000-Series

plug-in

units

form

complete

measurement

system. The

flexibility

the

plug-in

feature

and

variety

plug-in

units

available

allow

the

system

used

for

many

measurement

applica-

tions.

The

7844/R7844

provides

separate

vertical

and

horizontal

deflection

systems,

FOCUS,

INTENSITY,

and

BEAMFIND-

functions

for

each

beam.

The

plug-in

unit

either

vertical

compartment

can

selected

provide

vertical

de-

flection

for

either

beam.

The

plug-in

units

either

horizon-

tal

compartment

may

selected

provide

horizontal

de-

flection

for

either

beam.

The

7844/R7844

features

regulated

power

supplies

ensure

that

the

performance

not

affected

variations

line

voltage

and

frequency,

changes

load

due

vary-

ing

power

requirements

the

plug-in

units.

The

7844/R7844

operates

from

115

valt

230

volt

(50

400

Hz)

nominal

line

source.

Other

features

include

dual-gun

full-overlap

crt

with

graticule

area

centimeters.

The

instrument

also

provides

crt

display

alphanumeric

information

encoded

the

plug-in

units.

The

READOUT

display

indicates

plug-

unit

status

such

deflection

factor,

sweep

rate,

and

other

plug-in

dependent

parameters.

The

Option

instrument

basically

the

same

the

stan-

dard

7844/R7844

except

that

the

vertical

deflection

system

dedicated.

The

amplifier

unit

the

LEFT

VERT

compart-

ment

controls

the

vertical

deflection

beam

and

the

am-

plifier

unit

the

RIGHT

VERT

compartment

controls

the

vertical

deflection

beam

The

VERTICAL

MODE

switch

and

VERT

SEP

control

have

been

deleted.

Refer

the

Options

section

for

details.

PRELIMINARY

OPERATION

effectively

operate

this

instrument,

the

user

must

be-

come

familiar

with

the

operation

and

capabilities

the

in-

strument.

This

section

describes

how

use

the

front

and

rear-panel

controls

and

connectors.

REV.

JAN

1977

Safety

Information

This

instruction

manual

contains

warning

information

which

the

user

must

ensure

safe

operation

the

instru-

ment.

Warning

information

intended

protect

the

opera-

tor

and

Caution

information

intended

protect

the

instrument.

WARNING

}

This

instrument

intended

operated

from

single-phase

earth-referenced

power

source

having

one

current-carrying

conductor

{the

Neu-

tral

Conductor)

near

earth

potential,

Operation

from

power

sources

where

both current-carry-

ing

conductors

are

live

with

respect

earth

(such

phase-to-phase

three-wire

system)

not

recommended,

since

only

the

Line

Con-

ductor

has

over-current

{fuse}

protection

with-

the

instrument.

This

instrument

has

three-wire

power

cord

with

three-terminal polarized

plug

for

connec-

tion

the

power

source

and

safety-earth,

The

safety-earth

terminal

the

plug

directly

con-

nected

the

instrument

frame.

For

electric-

shock

protection,

insert

this

plug only

mat-

ing

outlet

with

safety-earth

contact

other-

wise

connect

the

frame

safety-earth

system.

The

color-coding

the

cord

conductors

accordance

with

recognized

standards.

Power

Cord

Conductor

Identification

Conductor

Color

Alternate

Color

Ungrounded

(Line)

Brown

Black

Grounded

(Neutral)

Blue

White

Grounding

(Earthing)

Green-Yellow Green-Yellow

Operating

Voltage

The

7844/R7844

has

VOLTAGE

SELECTOR

switch

which

allows

selection

either

115

volt

230

volt

nominal

line

voltage source.

When

changing

the

Voltage

Selector

switch

position,

disconnect

the

power

cord

and

use

small

screw-

driver

move

the

Voltage

Selector

switch

the

desired

range.

1-1

Operating

instructions—7844/R7844

Operators

(ey

CAUTION

PPL

LLL

Damage

this

instrument

may

occur

the

Voltage

Selector

switch

set

incorrect

position

for

the line

voltage

applied.

Voltage

Selector

Switch

Pasition

115

230

Regulating

Range

132

volts

180

264

volts

Operating

Temperature

The

7844/R7844

can

operated

where

the

ambient

air

temperature

between

0°C

and

+50°C.

After

storage

temperatures

beyond

the

operating

limits,

allow

the

chassis

temperature

come

within

the

operating

limits

before

power

applied.

The

7844

cooled

air

drawn

through

holes

the

side

and

bottom

panels

and

blown

out

through

the

fan

ex-

haust.

ensure

proper

cooling

the

7844,

maintain

the

clearance

provided

the

feet

the

bottom

and

allow

inches

clearance

the

top,

sides,

and

rear

(more

clearance,

possible}.

The

R7844

cooled

air

drawn

through

the

air

filter

the

rear

panel and

blown

out

through

holes

located

the

side

panels.

ensure

proper

cooling

the

R7844,

refer

the

dimensional

drawing

Section

this

manual

(Fig.

3-6).

thermal

cutout

disconnects

power

from

this

instrument

the

internal

temperature

exceeds

safe

operating

level.

Power

automatically

restored

when

the

temperature

re-

turns

safe

level.

Operating

Position

bail-type

stand

mounted

the

bottom

the

7844.

This

stand

permits

the

instrument

tilted

about

10°

for

convenient

crt

viewing.

PLUG-IN

UNITS

The

7844/R7844

accepts

Tektronix

7000-Series

plug-in

units.

This

feature

allows

selection

bandwidth,

sensitivity,

display

mode,

etc.,

and

provides

for

future

ex-

pansion

the

system.

The

overall

capabilities

the

system

are

determined

mainly

the

characteristics

the

plug-ins

selected.

Some

typical

combinations

are

given

under

Applications,

this

manual,

along

with

simplified

set-up

instructions,

For

information

other

plug-in

units,

refer

the

current

Tektronix

catalog.

installation

Plug-In Units

Plug-in

units

can

installed

removed

without

turning

the

instrument

power

off.

install

plug-in

unit

into

compartment,

align

the

slots

the

top

and

bottom

the

plug-in

unit

with

the

associated

guide

rails

the

plug-in

compartment.

Insert

the

plug-in

unit

into

the

compartment

until

locks

into

place.

remove

plug-in

unit,

pull

the

release

latch

the

plug-in

unit

disengage

it.

meet

emi

specifications,

all

unused

plug-in

compartments

should

covered

with

emi-shielded,

blank

plug-in

panel,

Tek-

tronix

Part

016-0155-00.

The

7844/R7844

Calibration

procedure

given

the

Service

manual

normalizes

the

vertical

and

horizontal

gains.

This

allows

plug-in

units

interchanged

between

plug-in

com-

partments

without

recalibration.

The

basic

calibration

the

plug-in

units

should

checked

when

installed

verify

their

accuracy

(refer

plug-in

operating

instructions}.

CONTROLS

AND

CONNECTORS

Figure

1-1

and

Figure

1-2

show

the

front

and

rear

panels.

brief

description

each

contro!

and

connector

given.

Re-

fer

Detailed

Operating

Information

this

manual

for

additional

operating

information.

Front-Panel

Color

Coding

Portions

the

7844/R7844

front-panel

are

color-coded.

These

color-coded

areas

are

defined

their

functions.

Red

identifies

the

nomenclature

and

controls

that

will

uncalibrate

the

instrument.

Biue

identifies

the

controls

affecting

the

crt

display

mode.

Green

identifies

all

trigger

controls.

Other

colors

such

gray,

orange

and

yellow,

have

func-

tional

assignments,

but

are

used

needed

indicate

the

relationship

between

controls

and/or

connectors.

FAMILIARIZATION

PROCEDURE

The

following

procedure

may

used

for

familiarization

with

the

7844/R7844

check

basic

instrument

op-

eration.

performing

the

Familiarization

Procedure

reveals

improper

calibration

instrument

malfunction,

first

check

the

operation

the

associated

plug-in

units;

then

refer

the

Calibration

and

Maintenance

sections

the

7844/R7844

Service

manual.

Set-up

information

for

both

the

standard

7844/R7844

and

Option

precedes

each

major

section

this

Familiariza-

tion

Procedure,

The

control

settings

for

plug-in

units

and

signal

connections,

when

needed,

are

also

given.

Set-Up

Information

Set

front-panel

controls

follows:

POWER

switch

Off

CALIBRATOR

kHz)

READOUT

INTENSITY

OFF

EXT/BEAM

GATED

BEAM

GATED

{push

button

OUT}

GRAT

ILLUM

wise

EXT/BEAM

GATED

BEAM

GATED

(push

button

OUT}

TRIG

SOURCE

LEFT

TRIG

SOURCE

RIGHT

BEAM

INTENSITY

Midrange

FOCUS

Midrange

VERTICAL

MODE

LEFT

BEAMFINDER

Push

button

out

HORIZONTAL

MODE

HORIZ

SEP

(1)

Midrange

BEAM

INTENSITY

Midrange

FOCUS

Midrange

VERTICAL

MODE

RIGHT

BEAMFINDER

Push

butten

out

HORIZONTAL

MODE

push

button

Fully

counterclock-

Operating

instructions—7844/R7844

Operators

Connect

the

7844/R7844

power

source

that

meets

the

voltage

and

frequency

requirements

the

instrument.

the

available

line

voltage

outside

the

limits

the

Vol-

tage

Selector,

see

Operating

Voltage

discussion

this

section.

Install

Tektronix

7A-Series

amplifier

units

into

both

the

LEFT

VERT

and

RIGHT

VERT

compartments.

Install

Tek-

tronix

7B-Series

time-base

units

into

the

and

HORIZ

compartments.

Turn

the

POWER

switch

ON.

Connect

the

CALIBRATOR

output

the

left

and

right

vertical

plug-in

units

with

BNC

cable

and

dual

in-

put

coupler.

Set

the

deflection

factors

both

vertical

units

for

divisions

displayed

signal

and

center

the

position

controls,

Set

both

units

for

input

coupling.

Set

both

time-base

units

for

sweep

rate

millisecond/

division,

Set the

triggering

for

auto

mode

with

coupling

from

the

internal

source

and

the

level

control

for

stable

display.

Position

the

display

necessary.

Display

Controls

Rotate

the

BEAM

and

BEAM

INTENSITY

controls

throughout

their

ranges;

then

set

the

INTENSITY

controls

desired

viewing

level.

Set

the

BEAM

FOCUS

control

that

the

top

and

bot-

tom

portions

the

beam

display

are

thin

possible

but not

elongated.

Set

the

BEAM

FOCUS

contro!

that

the

top

and

bottom

portions

the

beam

display

are

thin

possible

but

not

elongated.

NOTE

This

instrument

contains

circuitry

automati-

cally

protect

the

crt

against

damage

due

ex-

cessive

crt

beam

current,

the

INTENSITY

control

set

point

where

ert

phosphor

damage

could

occur,

this

circuit

limits

the

beam

current

safe

level.

The

circuit

action

will

also

cause

the

trace

defocus

which

indicates

that

the

intensity

should

reduced.

There-

fore,

the

FOCUS

adjustment

cannot

satis-

factorily

made,

reduce

the

INTENSITY

and

repeat

step

4-3

Operating

Instructions—-7844/R7844

Operators

Fig.

1-1.

Front-panel

controls

and

connectors.

1-4

1675-9

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