B+K precision 1474 User manual

¼!

IMAXT

INTERNATIONAL

CORP.

SERVICE

MANUAL

for

Model

1474,

1479,

1479A,

and

1479B

MHz

Triggered

Sweep

DUAL

-TRACE

OSCILLOSCOPE

IMAXTEC

INTERNATIONAL

CORP.

TEST

INSTRUMENT

SAFETY

WARNING

Normal

use

test

equipment

and

servicing

test

equipment

exposes

you

certain

amount

danger

from

electrical

shock

because

testing

must

often

performed

where

exposed

high

voltage

present.

electrical

shock

causing

milliamps

current

pass

through

the

heart

will

stop

most

human

heartbeats.

Voltage

low

volts

rms

should

considered

dangerous

hazardous

since

can

produce

lethal

current

under

certain

conditions.

Higher

voltage

poses

even

greater

threat

because

such

voltage

can

easily

produce

lethal

current.

Your

normal

work

habits

should

include

all

accepted

practices

that

will

prevent

contact

with

exposed

high

voltage,

that

will

steer

current

away

from

your

heart

case

accidental

contact

with

high

voltage.

You

will

significantly

reduce

the

risk

factor

you

know

observe

the

following

safety

precautions:

High

voltage

6000

volts

present

when

servicing

this

oscilloscope.

Observe

all

high

voltage

precautions

when

the

unit

operating

with

the

case

removed.

Remember

that

high

voltage

charge

may

retained

indefinitely,

especially

the

CRT

socket

and

anode

cap.

Discharge

high

voltage

capacitors

with

grounded

test

lead

after

removing

power.

Don't

expose

high

voltage

needlessly.

Remove

housings

covers

only

when

necessary.

Turn

off

equipment

while

making

test

connections

high

-voltage

circuits.

Discharge

high

voltage

capacitors

after

removing

power.

possible,

familiarize

yourself

with

the

equipment

being

tested

and

the

location

its

high

voltage

points.

However,

remember

that

high

voltage

may

appear

unexpected

points

defective

equipment.

Use

insulated

floor

material

large,

insulated

floor

mat

stand

on,

and

insulated

work

surface

which

place

equipment;

and

make

certain

such

surfaces

are

not

damp

wet.

Use

the

time

-proven

"one

hand

the

pocket"

technique

while

handling

instrument

probe.

particularly

careful

avoid

contacting

nearby

metal

object

that

could

provide

good

ground

return

path.

When

using

the

oscilloscope,

the

ground

wire

the

-wire

power

plug

places

the

chassis

housing

the

oscilloscope

earth

ground.

not

attempt

defeat

the

ground

wire

connection

oat

the

oscilloscope;

may

pose

great

safety

hazard.

When

using

probe,

touch

only

the

insulated

portion.

Never

touch

the

exposed

tip

portion.

When

testing

powered

equipment,

remember

that

line

voltage

usually

present

some

power

input

circuits

such

the

-off

switch,

fuses,

power

transformer,

etc.

any

time

the

equipment

connected

outlet,

even

the

equipment

turned

off.

continued

inside

back

cover

SERVICE

MANUAL

for

-PRECISION

Models

1474,

1479,

1479A,

and

1479B

DUAL

-TRACE

OSCILLOSCOPE

WARNING

This

service

manual

intended

for

use

qualified

electronics

technicians

only.

avoid

electric

shock,

not

perform

servicing

unless

you

are

qualified

so.

High

voltages

6000

are

presentwhen

this

instrument

operating.

Line

voltage

(120

240

Vac)

present

the

power

input

circuit

whenever

the

power

cord

connected

live

outlet,

even

the

scope

turned

off.

Observe

all

high

voltage

safety

precautions

when

the

housing

removed

from

the

oscilloscope.

Con-

tacting

exposed

high

voltage

could

result

fatal

electric

shock.

IF_~

~AIL+/A&:

-Precision,

Factory

Service

Operations

Maxtec

International

Corporation

6470

West

Cortland

Street

Chicago,

Illinois

60635

Tel

(312)

889-1448

Use

this

address

for

technical

inquiries

and

replacement

parts

orders.

TABLE

CONTENTS

Page

TEST

INSTRUMENT

SAFETY

Inside

Cover

DIFFERENCES

BETWEEN

MODELS

SPECIFICATIONS

ACCESSORIES

Accessories

Supplied

Optional

Accessories

Model

-74

Protective

Cover

Model

-133

Carrying

Case

Model

RM-14

Rack

Mounting

Kit

-40

10:1/Direct

Probe

-37

Deluxe

10:1/Direct

Probe

CONTROLS

INDICATORS

General

Controls

Triggering

Controls

Channel

Controls

Channel

Controls

Additional

Facilities

CIRCUIT

DESCRIPTION

Overview

Vertical

Attenuator

and

Preamplifier

Vertical

Mode

Logic

Vertical

Output

Amplifier

Trigger

Circuits

Horizontal

Sweep

Intensity

Circuit

High

Voltage

Power

Supply

Blanking

Circuit

Calibration

Voltage

Low

Voltage

Power

Supply

OPERATOR

MAINTENANCE

Astigmatism

Balance

Calibration

Check

Probe

Compensation

Trace

Rotation

Fuse

Replacement

TABLE

CONTENTS

SERVICE

Removing

the

Case

Fuse

Replacement

120/240

Conversion

Disassembly

Troubleshooting

CALIBRATION

General

Calibration

Check

Test

Equipment

Required

Preliminary

Procedure

Power

Supply

Adjustments

Intensity

and

Display

Adjustments

Vertical

Axis

Adjustments

Horizontal

Axis

Adjustments

Triggering

Adjustments

CAL

Square

Wave

Adjustments

Performance

Tests

PARTS

LIST

Mechanical

Parts

List

Packing

Drawing

Electrical

Parts

List

CIRCUIT

BOARD

MAPS

AND

SCHEMATIC

DIAGRAMS

Vertical

Amplifier

Board

Vertical

Output

Amplifier

Board

Horizontal

Amplifier

and

Sweep

Board

100

Power

Supply

Board

103

Overall

Schematic

Diagram,

Model

1474

106

Overall

Schematic

Diagram,

Model

1479

107

Overall

Schematic

Diagram,

Model

1479A

108

Overall

Schematic

Diagram,

Model

1479B

109

HISTORY

PRODUCTION

CHANGES

111

REFERENCE

PUBLICATIONS

Model

1474

Instuction

Manual

480-187-9-001

Model

1479

Instruction

Manual

480-264-9-001

Model

1479A

Instruction

Manual

480-280-9-001

Model

1479B

Instruction

Manual

480-302-9-001

Model

1474

Composite

(Schematic

Diagram

and

Parts

List)

499-181-9-001

Model

1479

Composite

(Schematic

Diagram

and

Parts

List)

499-161-9-001

Model

1479A

Composite

(Schematic

Diagram

and

Parts

List)

499-173-9-001

Model

1479B

Composite

(Schematic

Diagram

and

Parts

List)

499-202-9-001

-133

Carrying

Case

Instruction

Sheet

481-123-9-001

RM-14

Rack

Mounting

Kit

Instruction

Sheet

481-088-9-001

DIFFERENCES

BETWEEN

MODELS

ILABITYES

This

manual

covers

the

service

and

main-

tenance

-Precision

Models

1474,

1479,

1479A,

and

1479B

Triggered

Sweep

MHz

Oscilloscopes.

All

four

models

use

the

same

basic

circuit

configuration

and

most

the

service

information

applies

equally

all

models.

The

major

features

common

all

four

these

oscilloscopes

are

listed

below.

MHz

Bandwidth.

High

frequency

input

can

displayed

with

distortion

and

high

resolution.

11.7

Rine

Time.

The

fast

rise

time

allows

for

display

short

duration

pulses.

Dual

Trace.

Two

waveforms

can

displayed

either

singly

simultaneuosly.

Chop

alternate

method

dual

trace

automatic-

ally

selected

sweep

speed

control.

Built

Delay

Line.

For

viewing

leading

edges

high

frequency,

fast

rise

time

pulses.

Triggered

Sweep.

Level

control

sets

the

point

triggering

sets

amplitude

that

must

met

obtain

sweep.

dual

-sweep

mode,

either

channel

may

used

sweep

trigger.

Auto

Sweep.

Provides

sweep

when

trigger

signal

applied.

Automatically

reverts

triggered

sweep

when

signal

applied.

Versatile

Triggering.

Choice

external

trigger

source.

Selectable

trigger

coupling

offers

choice

ac,

dc,

with

high

low

frequency

rejection.

FIX

Mode.

selectable

FIX

mode

sets

trig-

gering

middle

waveform

regardless

LEVEL

control.

High

Sensitivity.

mV/div

sensitivity

permits

the

use

low

-capacitance,

high

-impedance

probes.

Sum

and

Difference

Capability.

Input

from

both

channels

may

algebraically

added

subtracted

for

differential

voltage

meas-

urem

ents.

Calibration

Source.

0.5

kHz

square

wave

provided

aid

scope

checking

and

probe

compensation.

Sweep

Speeds.

Allows

for

calibrated

time

measurements

from

0.2

1s/div

0.5

s/div.

Expanded

Scale.

The

trace

display

can

magnified

five

times

for

greater

visual

accuracy.

-Y

Operation.

Channel

input

can

used

the

horizontal

deflection

axis)

and

Channel

vertical

deflection

axis).

-Axis

Input.

Intensity

modulation

permits

time

frequency

marking

from

TTL

source.

DIFFERENCES

Unless

otherwise

noted,

all

information

this

manual

applies

equally

Model

1474,

1479,

1479A,

and

1479B.

The

schematics

the

individual

circuit

boards

and

the

accom-

panying

circuit

board

maps

are

the

latest

version

available

the

time

printing,

but

can

generally

used

for

troubleshooting

and

servicing

all

four

models.

separate

overall

schematic

each

model

provided

for

convenience.

-Precision

continually

strives

improve

its

products.

Changes

significant

DIFFERENCES

BETWEEN

MODELS

nature,

such

adding

function,

are

identi-

fied

changing

the

model

designation.

Thus,

the

model

designations

represent

the

chrono-

logical

improvements

upon

the

original

design.

The

Model

1474

was

the

original

MHz

oscilloscope

based

upon

this

design.

was

followed

Model

1479,

which

had

consider-

able

difference

mechanical

appearance,

DETect

triggering

was

added.

When

the

video

sync

separator

was

added,

the

model

designation

was

changed

1479A.

Most

recently,

with

the

change

from

round

rectangular

CRT,

the

model

designation

became

1479B.

specific

details

the

differences

between

models

are

given

below.

Complete

part

differences

are

itemized

the

parts

list.

Model

1474

recognized

by:

black

front

panel,

tan

case,

handle,

de-

tachable

power

cord,

and

external

100/120/220/240

voltage

plug.

Triggering

selection

either

EXT

(unat-

tenuated)

EXT

1/10

(10:1

attenuation).

Model

1479

has

several

changes

ap-

pearance

from

its

forerunner,

Model

1474.

The

1479

has

grey

and

silver

front

panel,

biege

case,

and

formed

handle.

Electrical

changes

were

also

made

trigger

and

sweep

circuits.

The

EXT

1/10

trigger

source

selec-

tion

was

replaced

DET

allow

for

triggering

the

modulation

envelope

signal.

Adjustments

were

added

the

sweep

board

for

high

speed

sweep

linearity.

While

the

initial

production

lots

1479's

still

have

the

detachable

power

cord

and

external

voltage

selector

plug

(like

the

1474),

the

later

units

have

fixed

power

cord

and

inter-

nal

120/240

voltage

plug.

Model

1479A

incorporated

selectable

video

sync

separator

circuit.

The

VIDEO

selection

permits

triggering

the

sync

pulses

from

composite

video

signal.

Vertical

sync

pulses

(frame)

are

automatically

selected

for

triggering

slower

sweep

times

0.5

s/div

0.1

ms/div.

Such

sweep

times

are

approp-

riate

for

viewing

vertical

frames

video.

Horizontal

sync

pulses

(line)

are

automatically

selected

for

triggering

faster

sweep

times

las/div

0.2

}.e/div

(appropriate

for

view-

ing

horizontal

lines

video).

The

front

panel

changed

allow

for

the

added

VIDEO/

NORM

switch.

The

AUTO

LEVEL/

NORM

switch

relabeled

FIX/

NORM,

but

the

function

remains

the

same.

Model

1479B

incorporates

rectangular

CRT

with

internal

etched

graticule

(non

illuminated)

replace

the

round

CRT

with

illuminated

graticule.

The

power

supply

changed

use

-1.5

CRT

cathode

voltage

and

voltage

tripler

develop-

ing

+4.5

for

the

CRT

anode.

This

compares

with

-1.9

cathode

potential

and

voltage

doubler

(+3.8

kV)

for

ode

potential

prev-

ious

models.

Electrical

trace

rotation

(adjust-

able

from

the

front

panel)

was

also

added.

This

includes

rotation

coil

the

neck

the

CRT

and

corresponding

trace

rotation

cir-

cuit

the

power

supply

board.

PRODUCTION

CHANGES

Our

program

continuous

evaluation

product

improvement

may

often

involve

minor

changes

and

refinements

which

are

not

signifi-

cant

enough

change

the

model

designation.

Beginning

with

Model

1479A

and

continuing

with

Model

1479B

(unfortunately,

have

similar

information

for

Model

1474

1479),

have

compiled

list

all

such

production

changes,

along

with

the

serial

numbers

where

such

changes

became

effective.

This

informa-

tion

located

the

very

end

this

manual

the

HISTORY

PRODUCTION

CHANGES

section.

This

information

should

helpful

when

the

unit

you

are

servicing

does

not

exactly

match

the

schematic

diagram

parts

list

found

this

service

manual.

Because

produc-

tion

changes

often

require

several

compatible

parts,

working

conjuction

with

each

other

achieve

the

improvement,

replacement

parts

should

usually

restore

the

unit

its

original

configuration.

SPECIFICATIONS

Unless

otherwise

stated,

all

specifications

apply

equally

Model

1474,

1479,

1479A,

1479B.

VERTICAL

AMPLIFIERS

(CH

and

Deflection

Factor

mV/div

V/div,

t3%,

ranges,

each

with

fine

adjustment.

Frequency

Response

DC:

MHz

(

-3

dB).

AC:

MHz

(

-3

dB).

Risetime

11.7

nanoseconds

less.

Overshoot

less.

Input

Impedance

megohm,

t2%,

shunted

(±3

pF).

I3ilt

Less

than

5%.

Max.

Input

Voltage

300

VDC

peak

600

-p.

Operating

Modes

Channel

only.

Channel

only.

Dual

trace:

automatically

chopped

all

sweep

times

ms/div

and

slower;

alternate

trace

automatically

selected

for

all

faster

sweep

times.

Add:

single

-trace

algebraic

sum

Channels

and

(difference

using

INVert).

Chop

Frequency

200

kHz

(

±20%).

Channel

Separation

Better

than

kHz.

Signal

Delay

Fixed,

minimum

visible

delay.

Polarity

Normal,

inverted

(provides

minus

function).

Maximum

Undistorted

Amplitude

Model

1479A

and

1479B:

than

div

from

MHz.

Model

1474

and

1479:

than

div

from

MHz.

than

div

MHz.

HORIZONTAL

AMPLIFIER

(Horizontal

input

thru

input)

-Y

Operation

With

SWEEP

TIME/DW

switch

position,

the

input

becomes

the

axis

input

(vertical)

and

the

input

becomes

the

axis

input

(horizontal).

The

position

control

becomes

the

hor-

izontal

position

control.

Deflection

Factor

mV/div

V/div,

t3%,

ranges,

each

with

fine

adjustment.

Frequency

Response

DC:

MHz

(

-3

dB).

AC:

MHz

(

-3

dB).

Input

Impedance

megohm

t2%,

shunted

(t3

pF).

Input

Protection

300

VDC

peak

600

-p.

SPECIFICATIONS

SWEEP

CIRCUITS

(Common

and

Sweep

System

Triggered

and

automatic.

Sweep

Time

0.2

/div

0.5

s/div

(

t3%),

ranges,

1-2-5

sequence

with

vernier

adjustment.

Sweep

Magnification

(five

times)

t5%.

Extends

maximum

sweep

rate

ns/div.

Linearity

better,

better

with

magni-

cation.

TRIGGERING

Source

Model

1474:

EXT,

and

EXT

1/10.

Model

1479,

1479A,

and

1479B:

EXT

and

DET.

Automatic

Sweep

triggered

without

input

signal.

Normal

Sweep

obtained

with

displayed

signal

amplitude

one

division

less.

The

point

the

displayedwaveform

which

the

sweep

starts

determined

the

SLOPE

and

LEVEL

controls.

Slope

Sweep

can

set

trigger

the

positive

negative

going

slope

the

trigger

waveform.

Level

Continuously

variable.

Pull

for

AUTO

(Sweep

obtained

without

input

signal).

FIX

Automatically

fixes

triggering

level

center

trigger

signal.

DET

(Models

1479,

1479A

and

1479B)

Triggers

from

modulation

envelope

amplitude

modulated

signal

(carrier,

fre-

quency

MHz

greater).

Coupling

AC:

DC:

REJ:

•

MHz

MHz.

Attenuate

below

kHz.

Attenuate

above

kHz.

Video

(Model

1479A

and

1479B

only)

Vertical

and

horizontal

sync

separator

circuit

provided

that

any

portion

composite

video

waveform

can

synchron-

ized

and

expanded

for

viewing.

LINE

sync

(horizontal

sync

pulses)

automatically

selected

sweep

times

.21.5/din.

0.515/div.

and

FRAME

sync

(vertical

sync

pulses)

automatically

selected

sweep

times

ms/din.

s/div.

TRIGGER

SENSTITVPFY

Minimum

Scnc

Voltage

Coupling

Bandwidth

INT

EXT

20Hz

15MHz

10Hz

30MHz

0.3

Div.

0.1

0.5

REJ

20kHz

15MHz

l0kHz

30MHz

0.3

Div.

0.1

0.5

REJ

20Hz

50kHz

10Hz

300kHz

0.3

Div.

0.1

0.5

NORM

FIX

DC-

15MIlz

DC-30MHz

0.3

Div.

0.1

0.5

20Hz

15MHz

10Hz

20MHz

0.3

Div.

0.1

0.5

AXIS

INPUT

(Intensity

Modulation)

Sensitivity

(TTL

compatible).

Usable

Frequency

Range

MHz.

Input

Impedance

kSZ.

Maximum

Input

Voltage

50VDC+AC

peak.

SPECIFICATIONS

OTHER

SPECIFICATIONS

Operating

Environment

45O

Power

Requirements

117/234

VAC,

50/60

Hz,

watts.

Calibra-

tion

will

remain

constant

over

105

130

VAC

input.

Calibration

Internal

0.5

-p

±1%

(square

wave

kHz

t3%).

OVERALL

DIMENSIONS

(Fig.

295

202

437

cm.

Maximum

(WxHzD)

(11-5/8

7-15/16

17-13/16")

Weight

8.5

kg;

lb.

Fig.

Overall

Dimensions.

CRT

Models

1474,

1479,

and

1479A

Round

CRT

with

P31

phosphor.

Post

deflection

acceleration.

Approx.

acceleration.

division

graticule

scale

division

cm),

variable

illumination.

Mechanical

trace

rotation.

See

H9155A-P31

CRT

specifications

for

detail.

Model

1479B

140

rectangular

CRT.

Internal

division

graticule

scale

division

cm). Post

deflection

acceleration.

Approx.

acceleration.

Electrical

trace

rotation,

adjustable

from

front

panel.

See

140CGB31

CRT

specifications

for

detail.

This manual suits for next models

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