Tektronix 475 Manuel utilisateur

—

{—

—

{of

TEKTRONIX.

INSTRUCTION

MANUAL

WARRANTY

All

TEKTRONIX

instruments

are

warranted

against

defective

materials

and

workmanship

for

one

year.

Any

questions

with

respect

the

warranty

should

taken

with

your

TEKTRONIX

Field

Engineer

representative.

All

requests

for

repairs

and

replacement

parts

should

directed

the

TEKTRONIX

Field

Office or

representative

your

area.

This

will

assure

you

the

fastest

possible

service.

Please

include

the

instrument

Type

Number

Part

Number

and

Serial

Number

with

all

requests

for

parts

service.

Specifications

and

price

change

privileges

reserved.

1972 by

Tektronix,

Inc.,

Beaverton,

Oregon.

Printed

the

United

States

America.

All

rights

reserved.

Contents

this

publication

may

not

reproduced

any

form

without

permission

Tektronix,

Inc.

U.S.A.

and

foreign

TEKTRONIX

products

covered

U.S.

and

foreign

patents

and/or

patents

pending.

TEKTRONIX

registered

trademark

Tektronix,

Inc.

Tektronix,

Inc.

-®

P.O.Box

500

-®

Beaverton,

Oregon

97005

-®

Phone:

644-0161

-®

Cables:

Tektronix

070-1333-00

872

TABLE

Introduction

Operating

Voltage

Controls

And

Connectors

Applications

General

Peak-To-Peak

Voltage

Measurements—AC

Instantaneous

Voltage

Measurements—DC

Comparison

Measurements

Time-Duration

Measurements

Frequency

Measurement

Risetime

Measurements

Time-Difference

Measurements

Delayed

Mixed

Sweep

Time

Measurement

Delayed

Mixed

Sweep

Magnification

Pulse

Jitter

Measurements

Delayed

Trigger

Generator

Normal

Trigger

Generator

Multi-Trace

Phase

Difference

Measurements

High

Resolution

Phase

Measurements

X-Y

Phase

Measurement

Common-Mode

Rejection

Operational

Features

General

Intensity

Control

Graticule

Vertical

Mode

Operation

Deflection

Factor

Ground

Considerations

CONTENTS

Page

Input

Coupling

Trigger

Source

Trigger

Coupling

Trigger

Slope

Trigger

Level

Sweep

Triggered

Light

Trigger

Mode

Trigger

Holdoff

Horizontal

Mode

Operation

Horizontal

Sweep

Rates

Sweep

Magnification

External

Horizontal

(X-Y)

Operation

Output

Signals

Intensity

Modulation

Calibrator

Obtaining

Basic

Displays

Introduction

Normal

Sweep

Display

Magnified

Sweep

Display

Delayed

Sweep

Displays

Mixed

Sweep

Display

X-Y

Display

User’s

Calibration

General

TRACE

ROTATION

Adjustment

Vertical

GAIN

Probe

Compensation

Basic

Timing

Accuracy

External

Horizontal

Gain

Accuracy

475

Page

475

OSCILLOSCOPE

Introduction

This

Operators

Handbook

intended

give

the

necessary

information

allow

user

become

familiar

with

the

instrument’s

power

requirements,

functions

controls

and

connectors,

and

also

provides

few

methods

making

several

different

measurements

electrical

phenomena.

Also

included

rudimentary

procedure

for

checking

basic

instrument

calibration.

Operating

Voltage

This

instrument

designed

for

operation

from

power

source

with

its

neutral

near

earth

(ground)

potential

with

separate

safety-earth

conductor.

not

intended

for

operation

from

two

phases

multi-phase

system,

across

the

legs

single-phase

three-wire

system.

This

instrument

can

operated

from

either

115-volt

230-volt

nominal

line

voltage

source,

440

hertz.

The

line

voltage

selector

switch

the

instrument

converts

475

the

instrument

from

one

nominal

operating

voltage

the

other.

The

regulating

range

selector

assembly

the

instrument

rear

panel

selects

one

three

regulating

ranges

for

each

nominal

line

voltage,

and

also

contains

the

line

fuses

for

overload

protection

for

both

nominal

line

voltages.

select

the

correct

nominal

line

voltage

and

regulating

range,

proceed

follows:

Disconnect

the

instrument

from

the

power

source.

To.convert

from

115-volts

nominal

230-volts

nominal

line

voltage,

set

the

selector

switch

the

230

volts

position

(toward

the

rear

the

instrument).

Change

the

line-cord

plug

match

the

power

source

use

115-to-230

volt

adapter.

NOTE

Color-coding

the

cord

conductors

follows

(in

accordance

with

National

Electrical

Code):

Line

Black

Neutral

White

Safety

earth

(ground)

Green

change

regulating

ranges,

loosen

the

two

captive

screws

which

hold

the

cover

onto

the

regulating

range

selector

assembly;

then

pull

remove

the

cover.

Pull

out

the

range

selector

switch

bar

(see Fig.

1).

Slide

the

bar

the

desired

position

and

plug

back

in.

Select

range

which

centered

about

the

average

line

voltage

which

the

instrument

connected

(see

Table

1).

115/230V

SWITCH

INSIDE

Selector

switch

bar

(shown

medium

position)

IGHT

SIDE,

REAR)

TABLE

Regulating

Ranges

Range

Selector

Switch

Position

folts

30-

folts

Nominal

(switch

bar

198

left

holes)

121

volts

242

volts

(switch

bar

103.5

207

middle

holes)

126.5

volts

253

volts

(switch

bar

108

216

right

holes)

132

volts

264

volts

Fig.

Power

supply

regulating

range

selector.

Re-install

the

cover

and

tighten

the

two

captive

screws.

Before

applying

power

the

instrument,

check

that

the

line

voltage

selector

switch

and

the

indicating

tabs

the

regulating

range

selector

assembly

are

the

correct

positions

for

the

line

voltage

the

instrument

will

operated

on.

This

instrument

may

damaged

operated

with

the

line

voltage

selector

switch

the

regulating

range

selector

assembly

set

incorrect

positions

for

the

line

voltage

applied.

The

475

designed

be used

with

three-wire

power

system.

three-

two-wire

adapter

used

connect

this

instrument

two-wire

power

system,

sure

connect

the

ground

lead

the

adapter

earth

475

(ground).

Failure

complete

the

ground

system

may

allow

the

chassis

this

instrument

elevated

above

ground

potential

and

pose

shock

hazard.

The

feet

the

rear

panel

provide

convenient

cord

wrap

store

the

power

cord

when

not

use.

Controls

And

Connectors

The

major

controls

and

connectors

for

operation

the

475

are

located

the

front panel

the

instrument.

Several

auxiliary

functions

are

provided

the

rear

panel.

make

full

use

the

capabilities

this

instrument,

the

operator

should

familiar

with

the

function

and

use

each

these

controls

and

connectors.

brief

description

each

given

here.

Some

the

important

instrument

specifications

are

included here

also.

‘

@a7s5

OSCILLOSCOPE

and

VOLTS/DIV-—selects

the

vertical

deflection

VARiable—provides

continuously

variable

uncalibrated

deflec-

UNCALibrated—indicates

when

the

VARiable

VOLTS/DIV

POSITION—positions

the

display

vertically.

and

Y-—input

connectors

for

application

AC-GND-DC-selects

the

method

used

couple

signal

the

factor

1-2-5

sequence

(VARiable

control

must

the

calibrated

detent

for

the

indicated

deflection

factor).

Calibrated

position

accuracy

within

3%.

tion

factors

between

the

calibrated

settings

the

VOLTS/DIV

switch.

control

out

the

calibrated

detent

position

and

the

vertical

deflection

factor

uncalibrated.

external

signals

the inputs

the

vertical

amplifier.

the

X-Y

mode

operation,

the

signal

connected

the

connector

provides

horizontal

deflection

and

the

signal

connected

the

connector

provides

the

vertical

deflection.

Input

impedance

megohm

paralleled

approxi-

mately

picofarads.

Minimum

bandwidth

the

normal

mode

operation

least

200

MHz.

X-axis

has

bandwidth

X-Y

operation

megahertz

and

compensated

have

1°

less

phase

difference

with

relation

the

axis

from

MHz.

input

the

vertical

amplifier.

the

position,

signals

are

capacitively

coupled

the

vertical

amplifier.

The

component

the

input

signal

blocked.

Low

frequency

—3

point

about

Hz.

the

GND

position,

the

input

the

vertical

amplifier

disconnected

from

the

input

connector

and

grounded.

Allows

precharging

the

input

coupling

capacitor.

the

position,

all

components

the

input

signal

are

passed

to the

input

amplifier.

475

{

POSITION

;

BaeuLeecore

11,

VERTical

MODE-selects

mode

operation

for

vertical

amplifier

system.

Channel

only

displayed.

ALTernate:

Dual-trace

display

the

signals

both

channels.

Display

switched

between

channels

the

end

each

sweep.

ADD:

Signals

applied

to the

and

input

connectors

are

algebraically

added,

and

the

algebraic

sum

displayed

the

CRT.

The

INVERT

switch

Channel

allows

the

display

plus

minus

CHOP:

Dual-trace

display

the

signals

both

channels.

Display

switched

between

channels

repetition

rate

approximately

MHz.

Channel

only

displayed.

Must

selected

X-Y

operation.

100

MHz

BW/TRIG

VIEW—Multi-position

switch

that

limits

the

bandwidth

the

vertical

amplifier

system

ap-

proximately

100

MHz

when

pulled

(100

MHz

posi-

tion

not

provided

for

below

B100000)

causes

signal

con-

nected

External

Input

connector

displayed

the

CRT

when

pressed.

When

not

pressed,

full

bandwidth

pro-

vided.

INVERT

—Channel

display

inverted

the

INVERT

(button

in)

position.

BEAM

FINDer—comoresses

the

display

within

the

graticule

area

independently

display

position

applied

signals

and

provides

visible

viewing

level.

INTENSITY—controls

brightness

the

CRT

display.

475

12.

13.

14,

15.

16.

18.

FOCUS

—adjusts

for

optimum

display

definition.

SCALE

ILLUMination—controls

graticule

illumination.

ASTIGmatism—screwdriver

adjustment

used

conjunction

with

the

FOCUS

control

obtain

well-defined

display.

Does

not

require

readjustment

normal

use.

TRACE

ROTATION

-—adjusts

trace

align

with

the

horizontal

graticule

lines.

X10

MAGnifier—increases

displayed

sweep

rate

factor

10.

Extends

fastest

sweep

rate

nanosecond/division.

Calibrated

magnified

sweep

accuracy

typically

within

3%.

POSITION-—positions

the

display

horizontally.

CALIBRATOR—a

combination

current

loop/squarewave

voltage

output

device.

Provides

(within

2%)

square-

wave

current,

300

(within

1%)

squarewave

voltage

signal

with

repetition

rate

approximately

kHz.

19.

TRIGger

MODE-—determines

the

mode

operation

for

Trigger

circuit.

AUTOmatic:

The

sweep

initiated

the

applied

trigger

signal.

the

absence

an adequate

trigger

signal,

the

sweep

free

runs

and

provides

bright

reference

trace.

NORMal:

The

sweep

initiated

the

applied

trigger

signal.

the

absence

adequate

trigger

signal,

there

trace.

SING

SWP:

when

this

pushbutton

pushed,

Sweep

operates

the

single

sweep mode.

After

sweep

displayed,

further

sweeps

cannot

presented

until

the

SING

SWP

button

pushed.

475

ese

BooLroyAIGGER

20.

TRIGger

HOLDOFF-—provides

continuous

control

time

EVEL

between

sweeps.

Allows

triggering

aperiodic

signals

(such

complex

digital

words).

the

fully

clockwise

position

ENDS

A),

sweep

reset

the

end

sweep

provide

the

fastest

possible

sweep

repetition

rate

for

delayed

sweep

presentations.

21.

COUPLING—determines

method

used

couple

signals

trigger

generator

circuit.

AC:

Signals

are

capacitively

coupled

the

input

the

trigger

generator

circuit.

rejected

and

signals

bDelow

about

are

attenuated.

REJ:

Signals

are

capacitively

coupled

the

input

the

trigger

circuit.

rejected

and

signals

below

about

kHz

are

attenuated.

REJ:

Signals

are

capacitively

coupled

the

input

the

trigger

circuit.

rejected

and

signals

below

about

and

above

about

kHz

are

attenuated.

DC:

All

components

trigger

signal

are

coupled

the

input

the

trigger

circuit.

22.

SLOPE

-selects

the

slope

the

trigger signal

which

starts

the

sweep.

Sweep

can

triggered

from

the

positive-going

portion

trigger

signal.

—:

Sweep

can

triggered

from

the

negative-going

portion

trigger

signal.

Pose

POSITION

300mv

30mA

“—

Goi

23.

LEVEL-—selects

the

amplitude

point

the

trigger

signal at

which

the

sweep

triggered.

475

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