Tektronix 454A Service manual

Tektronix, Inc. • P.O. Box 500 • Beaverton, Oregon 97005

ERATO.RS

HA·ND8·'0;0

This Operators Handbook supplements

the complete Instruction Manual

~ro"ided

. for this instrument. For more detailed infor-

mation,'refer to the Instruction Manual.

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070-1106-00

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.454A

OPERATO.S HANDBOOK

CONTENTS

Specifications

Operating Instructions

Operating Voltage 5

Contro(s

and

Connectors 5

Simplified Operation Instructions 13

Users

Calibration 17

® 1970 by

Tektronix,.

Inc.,

Beaverton, Oregon. Printed in the United States

America;

All

rights reserved. Contents

this

publication may

not

reproduced in any

form

without

permission

the copyright owner.

® 1170

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SPECIFICATIONS

The specifications given in this handbook

are

only

partial list condensed

from

the specifications listed

Sec-

tion

the Instruction Manual. These specifications most

directly reflect the capabilities

the 454A.

Characteristic Performance

Deflection Factor

Direct

with

P6054

mV/div

MHz, 7

mV/div

100 MHz, 3.5

mV/div

150 MHz, 2.4

V/div

Deflection Factor

Channel 1

Added Mode

Accuracy (With

without

P6054 Probe)

Maximum Risetime

and

Minimum

Bandwidth

Upper

-3

Point AC (capac-

itive)

and

(direct) Coupled,

Four-Division Ref-

erence, 25-0hm

Source Impedance

(OOC

+40°C)

VERTICAL

DEFLECTION

SYSTEM

Channel 1

and

Cascaded

using

Within

indicated deflection

18-inch 50 rl

factor

with

GAl

N correctly

ad-

cable,

and

justed

at20

mV/DIV'

VOLTS/

DIV

set

mV/DIV,

unter-

minated, TRIG-

GER switch set

NORM.

Bandwidth at Lower

-3

dB Point, AC

(capacitive) Couple

Coupled

Common-Mode

Rejection Ratio AC

and

Coupled

454A

MHz,

less

( 1 Hz

with

P6054

probe),

least 20:1 at 20 MHz.

Performance Characteristic

Characteristic Performance

Delay Time

Jitter

Maximum

Safe

Input

One part

less,

in 20,000

lOX

Voltage the

TIME/DIV

setting.

All

V/DIV

Settings 500 volts

peak

AC (one kilo- Differential Time

Within

1.5%

and

4 minor

hertz

less).

Measurement

TIME

MULTIPLIER

dial divisions

Accuracy

TRIGGERING

AND

B SWEEP).

-T-r-ig-ge-r-s-e-n-si-ti-V-ity--I~s_e_e_F_i_9.~1_.

HORIZONTAL

DEFLECTION SYSTEM

for

delay times

0.1

lls

ms.

Within 2.5%

and

4 minor

DELAY

TIME

MULTIPLIER

dial divisions

for

delay times

0.1

second

to 5

seconds.

Sweep

Accuracy

Over Center 8

Divisions Unmagnified Magl'lified

±3% ±4%

Mixed

Sweep

Within

plus

measured

sweep

Accuracy error.

X-Y

OPERATION

Bandwidth

Upper

least 2 MHz.

-3

dB Point

DELAYED/MIXED

SWEEP

Phase

Shift

Between

3°

less

2 MHz.

Calibrated Delay Time Continuous from 50

seconds

0.1

Channell

(X)

and

microsecond. Channel 2 (Y)

Delay Time Accuracy

OoC

+400 C Z

AXIS

INPUT

5 s/div

0.1

s/div

Within

2.5% Sensitivity Five

volt

peak

signal

pro-

50 ms/div to

Within

1.5%

duces noticeable modulation at nor-

0.1

lls/div mal intensity.

454A

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Vertical

:=:::

1=+=+=I+l+1r:r-:==+:::J=4=+:q:m=+:;:;:;::+=Um

Signal applied

deflect,ion

1-+-+-I-+++lIf----f-l----f-+-1-t+H+:'-:;-,.I'

1--+-+--H+++t'---.,.-H"--t-'-H+t+HI--'I

I EXT TRIG INPUT

(divisions)

\ DC, AC,

~:i'~i:tl~:)

t:.:t::t:I:l:Wtt:=t::t=t:4::t:ttm=:(

I-''-:+--o++-I-H+f----'-+-+-f---,-f-+-H-f-+'I---J

,~,-+-+-H~-++---1-+-+-+-+lI-+t+__f1I.1'r-

f--

,rlf-+-ir+I+t+---+--+-++t+H+-WiI-If-;-1H-t++I

1.5

i=:::=;

375

f--

1.4

f--

I-------l

f------'

I---

f-+_H+++Hr---+-t-'-+-+-l-+lH+t----i

\-HH--t+Ht-+-lI-+-H+++H--;

r--+-+--+-+-+t-t+---+---f---f-l-t+1H1--H-HH-++++1

1.2

J=t:1~~m:~~=t::t:Uttl+=~

300

f-+-+-IH-lI-+tt--+-+-+-+-t+++l.t---1

\-+-I-+-+t-++I-+-t--t-t-1-H~I-~

l--+-+-++-t+/t---1---+-+-Hf+alR-I----f-+--IH-+-++t:H

::::J

'i=~:tI:Wt=:t:t=t::ttttw~=4

t--+-+-+++t-t+--++--t-iH-t-H-H---{

1.0

~+-+-+-1-I+t+-""";'-+--+-+-+-lII-Il-++-HI-+-+-i-+-t+i-I

- (:: 0 Verification

Points

F---,

0.8 -

-----'

Typical

-3

Points

------j

-----'

0.6

l=EE]:m~:EE:EE~WE8l=~'

k:+=t:t:Wet==t::t:=t:::t:tttttt:::)

I-+-H+t+HI--+--I*f

·-+-t+1f++---IH-HH--t++-H

t-+-+-+-H

REJ

~f-+++-f-+'I-----l

~'--'~""LF

REJ

++--+--1-t-++HF

REJ

I---

'r-t-H+t+HI-'

...

....

...

'rl-t--+-+-t-t+1l-tb"

.......

•

~I--I--+4+-1-+t-+t---n·-+-+-I-H-'lcH"

0.4

f--

...

......

...

lit

a: a:

if if if if

•

iii

f--

.....

0.3

f--

0.2

t--

I---

1----1

I---

Frequency

Fig, 1. Trigger sensitivity

specification

limit

curve.

® 454A 3

Characteristic Performance

Usable Frequency

Range

50 megahertz.

CALIBRATOR

Accuracy

Voltage

Current

Repetition Rate

O°C

+40oC

volt

within

5 rnA within

1 kHz within

0.5%

Risetime

One

microsecond

less.

Duty Cycle

49%

51%.

Output

Resistance

250

nwithin 1

Characteristic Performance

Medium

104

126 volts.

High 112

136 volts.

230 Volts Nominal

Low 180

220 volts.

Medium 208

252 volts.

High 224

272 volts.

Line Frequency 48

62 Hz.

Maximum Power

,Consumption 116

watts

115 V, 60 Hz line.

CATHODE·RAY

TUBE (CRT)

POWER SUPPLY Resolution

Voltage Range (AC,

RMS)

Geometry

115 Volts Nominal Beam Finder

Low

110voltS.

15 lines

greater in

one

division.

0.1

division

less.

Limits display within graticule area

when'

pressed.

454A

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OPERATING

INSTRUCTIONS

Operating Voltage Before applying power

the instrument, check

that

the

indicating tabs

the switch bars

are

protruding through

the correct holes

for

the

desired nominal line voltage and

regu

lating range.

This

instrument

is designed

for

operation

from

power

source

with

its

neutral

near earth CONTROLS

AND

CONNECTORS

(ground)

potential

with

a separate safety-earth con-

Cathode-Ray Tube

ducter.

not

intended

for

operation

from

two

phases

a multiphase system,

across the

legs

a FOCUS Provides adjustment

for

optimum

single-phase three-wire system; display

definition.

The

454A

can

operated

from

either a 115-volt

BANDWIDTH-BEAM

Three position switch which pro-

230-volt nomihal line voltage source. The t Line Voltage

FINDER

vides bandwidth

limiting

and

beam

Selector assembly on the rear panel converts this instru- location.

ment

from

one operating voltage

the other. This

assem-

bly also includes the fuses

that

provide protection

for

the

MHz: Vertical

Amplifier

band-

line-input

portion

the instrument.

convert

from

width

limited

provide a

re-

115-volt

230-volt

nominal lil'le voltage, or vice versa,

duction

in displayed

noise

in-

remove the cover

from

the Line Voltage Selector assembly. terference.

Then, pull

out

the Selector switch

bar

and' plug

back

into

LL:

Normal operation

with

full

the remaining holes. Change the

line"cordpower

plug

rtical

Amplifier

bandwidth

match the power-source receptacle

usea 115-

230-volt capabilities.

adapter.

change regulating

ranges,

pull

out

the

Range

Selector switch bar, slide

the desired position and plug BEAM

FINDER:

Compresses dis-

back in. Select a range which

centered about the aver- play

within

graticule

a~ea,

inde-

age

line voltage

which the instrument

conn'ected. pendently

display position

'Replace the cover and tighten the

two

captive screws. applied signals.

® 454A 5

VOLTS/DIV

VARIABLE

UNCAL

STEP ATTEN BAL

Input Coupling

(AC·GND·DC)

Vertical (both channels

except'~s

noted) GND: (Ground) Input circuit

grounded (does

not

ground ap-

plied signal).

Selects vertical deflection

factor

1-2-5 sequence (VAR lAB

con-

trol

must

CALposition

for

indicated deflection factor).

Provides continuously

variC!ble

un-

c a Iibrated

deflection'

fa~t6rs

be-

tween

the

calibrated settings

the

VOLTS/DIV switch.

(Uncalibrated) Light indicates

that

the

VARIABLEcontrol.is

not

the

CAL positioh.

(Step

Attenuator

Balance) Screw-

driver

adjustment

balance

Input

Amplifier

the

2, 5

and

positions

the

VOL

TS/DIV

switch.

Selects

method

coiJpling

input

signal

grid

Input

Amplifier.

AC:

component

input

signal

blocked. Low frequency lim it

(-3

dB point)

about

hertz.

PROBE POWER

MODE

454A

DC: All

components

the

input

signal are passed

the

Inrut

Amplifier.

Power

source for active

probesys-

.'tems.

Selects vertical mode

operation.

.1:

The

signal

connected

the

INPUT

connector

dis-

played.

The

signal connected

the

INPUT

connector

dis-

played.

(Alternate) Dual-trace display

'signals

both

channels. Dis-

play switched

end

each

sweep.

CHOP: Dual-trace display

signals

both

channels.

Display

switched between channels

repetition

rcite

about

one

megahertz.

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~~'

INT

TRIGGER

ADD

: Signals applied

the

PUT

.l and INPUT

connec-

tors

are algebraically

added

and

the

algebraic sum is

displayed

the

CRT.

The

INVERT

switch

Channel 2 allows

the

display

1 - CH

(Internal Trigger)

Selects

source

internal triggering signal

from

verti-

cal system. Also selects

the

source

the

X signal for

X-V

mode

opera-

tion.

NORM: Sweep

circuits

triggered

from

displayed channel(s). Chan-

nel 1 signal available

CH 1

OUT

connector.

ONLY

X-V:

Sweep

cir-

cuits

triggered :only

from

the

sig-

nal

applied

the

INPUT

connector.

No signal available

OUT

connector.

lights, located beside A

and

SOU RCE switches,

indicate

that

the

INT

TRIGGER

switch

the

ONLY

ORX-Y

position.

454A

LEVEL

HF STAB (A Trigger-

ing Only)

SLOPE

For

X-V

mode

operation:

Chan-

nel 1 signal

isconmictedtQ'ithe

Horizontal

Amplifier. '

INVERT

(CH

2 only)

Inverts

the

Channel 2 display

when

pulled

out.

A and B Triggering (both where applicable)

Selects

amplitude

point

trigger

signal

which sweep is triggered.

igh

Frequency

Stability)

De-

. creases display

jitter

for

trigger sig-

n~ls

above

about

megahertz. Has

negligible

effect

lower

repetition

rates.

Selects

slope

trigger signal

which

starts

the

sweep.

+: .

Sweep

can

triggered from

positive-going

portion

trigger

signal.

Sweep

can

be triggered from

negative-going

portion

trigger

signal.

COUPLING Determines method

coupling

trigger

signal

trigger circuit.

AC:

Rejects

and

attenuates

sig-

nals

below about 30 hertz. Ac-

cepts

signals

between

about

hertz

and

150,megahertz.

System.

When

light

"on,

trigger. signal

obtain~

only

from

the Channel 1

input

signal;

when the light

off,

the trigger

signal

obtained

from

the dis-

played

channel(s). Source

internal trigger

signal

selected

the TR IGGER switch.

REJ: (Low Frequency Reject)

Rejects

and attenuates

sig-

nals below about 50 kilohertz.

LINE: Trigger

signal

obtained

from

a sample

the line voltage

ap-

plied

this instrument.

Accepts

signals

betWeen about

50 kilohertz

and

150 megahertz.

HF REJ:

(High

Frequenc!y Reject)

Accepts

signals

between about

hertz

and

50 kilohertz;

re-

jects

and attenuates signals

outside the above

range.

EXT:

Trigger

signal

obtained

from

external

signal

applied

the

EXT

TRIG

INPUT connector.

EXT

-:-

10: Attenuates external trig-

ger signals 10 times.

SOURCE

DC: Accepts all trigger signals

from

150 megahertz

greater.

Selects source

trigger signal.

Light

indicates

that

the intern,,1

trigger signal

obtained

only

from

the signal connected

the INPUT

1 connector

(see

TR IGGER

switch).

NT:

Internal trigger signal ob-

tained from VertiCal Deflection

EXT

TRIG

INPUT I

nput

connector

for

external trigger

signal.

4~A

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