Heath Zenith SO-4226 Manual de usuario

HEATH

l

/L

L

25

MHz

OSCILLOSCOPE

Model

SO-4226

595-3896

HEATH

COMPANY

Copyright

©

1987

Heath

Company

BENTON

HARBOR,

MICHIGAN

49022

All

Rights

Reserved

Page

2

Precautions

for

Use

Inspect

the

shipping

carton

for

serious

ship-

ping

damage.

If

you

notice

damage,

notify

the

carrier

immediately.

Before

you

apply

power

to

the

Oscilloscope,

make

certain

that

the

voltage

selector

plug

on

the

rear

panel

has

been

inserted

with

the

arrow

marking

in

the

direction

of

the

proper

line

voltage.

Also

check

the

fuse

to

be

sure

it

is

of

the

proper

rating.

Do

not

leave

a

bright

beam

on

the

CRT

screen

for

long

periods.

This

can

cause

permanent

damage

to

the

screen.

This

instrument

is

convection-cooled.

Always

be

sure

the

cooling

vents

are

not

blocked

when

you

are

operating

it.

To

insure

stable

operation

over

long

periods

of

time,

do

not

subject

the

Oscilloscope

to

vi-

bration,

direct

sunlight,

extreme

temperature

variations, high

humidity,

dust,

or

elec-

tromagnetic

fields.

Page

3

Table

of

Contents

INTRODUCTION

.

..ottt

einee

s

4

Horizontal/Time

Base

.

...................

18

CalIbTator

/o

PP

Rieniniis

s

i

s

v vavauns

19

BPECIFICATIONS

.

vovve

e

deaneti

Vo

Hlnmmne

5

CRT-Cant8l

.

o0l

%

vs

iy

s

vunnnn

19

Power:

Supply:

.

.inadalantlad

i

D

s

19

OPERATION

;5505455

sammmnanns

s §

s

¢

¥

prone

9

Controls

and

Connectors

..................

9

MAINTENANCE

&

ADJUSTMENTS

..........

20

Preliminary

Operation

...................

11

General

Maintenance

....................

20

Triggering

the

Sweep

...................

11

Adjustment

and

Calibration

..............

20

X-Y

Display

Operation

..................

12

Power

Supply

Adjustments

............

20

Voltage

Measurements

.

..................

12

CRT

Circuit

Adjustments

..............

21

Dual*Trace-Display

«¥%.

#8000

T

o

v

Vertical

Axis

Adjustments

.............

21

Synchronizing

TV

Signals

Horizontal

Axis

Adjustments

...........

23

Addition

and

Subtraction

Operation

.......

12

SCHEMATICS

..

..ttt

24

APPLICATIONS!

ccoesioisstimmnssssssas

13

Vertical

Amplifier

Schematic,

AC

Voltage

and

Frequency

Part

1

somonsssss

6000

ivvsasmmisistonsse

o o

o

25

Measurements

..

......oouerereenennn.n

13

Vertical

Amplifier

Schematic,

-

DC

Voltage

Measurement

................

13

Part

120

spouns

65

05

55

58§

&

Do

&

5

9

26

AM

Modulation

Measurement

............

14

Horizontal/Time

Base

Schematic,

Dual

Trace

Applications

.

.ovweisa

s

wns

14

PETE

1

ovnvasen

s

00

5% 55

85

8

50

BSQEEREESE

3

8

27

Comparison

of

Levels

«:::vvsmonmemiansens

14

Horizontal/Time

Base

Schematic,

Checking

Stereo

Systems

................

14

=75

2

R

28

SErvicing

TV

Sets

zisussssnssosmenutasss

14

Power

Supply

and

CAL

Schematic

........

29

Composite

Video

Analysis

...............

15

HV

Supply

and

CRT

Frequency

Measurement

With

Circuit

Schematici

.

.::

s

uv

s

v

o

s

30

X-Y

Method

.

.......

...

..

.l

15

Phase

Measurement

.....................

15

REPLACEMENT

PARTS

LIST

...............

31

GIRCUIT

DESCRIPTION

‘ccusiie

s

6

6 o

5

w

sszovscsinse

»

17

CUSTOMER

SERVICE

INFORMATION

.......

32

General

sy

vowonaupmmenn

s

5§

¢

o

9

s

17

Veitical,

AMPIfier-

cuwammsss

s

5

o

awemeaes

17

WARRANTY

.o

s

34

Page

4

INTRODUCTION

The

vertical

amplifiers

on

this

dual-trace

25

MHz

Oscilloscope

have

a

calibrated

sensitivity

of

1

mV/division,

a

flat

frequency

response,

and

a

smooth

rolloff

above

25

MHz.

Maximum

sweep

speed

is

20

ns/division.

The

8

X

10

cm

rectangular-

type

CRT

with

internal

graticule

gives

the

Oscillo-

scope

a

good

look,

while

it

is

rugged

enough

for

use

in

developmental

work,

on

production

lines,

in

.

maintenance,

and

in

servicing.

This

scope

also

has

the

following

features:

®

6 0

06060

0

Wide

bandwidth

and

high

sensitivity.

High

stability

with

low

drift.

Video

delay

line.

A

high-sensitivity

X-Y

mode.

A

Z-axis

modulation

input.

A

TV

video

sync

filter.

A

trigger

level

lock

function.

Variable

trigger

hold-off.

A

single

sweep

function

to

display

single-shot

waveforms.

A

high

brightness

CRT.

Page

5

SPECIFICATIONS

VERTICAL

DEFLECTION

Deflection

Factor

..............c.oouviiinnn.

Magnification

c.is

« +

cosmssin

s s

&

smmsawmprs

&

x s

Bandwidth

(at

=3dB)

.iowsidn’s

23

mamienmness5s

s

Rise

Time

.

.......ooiuiiiiiiiiiiiiinnann,

OVErSHOOE

cv.ussemsuiss

s

&

susrarsramsamens

5,5

sistosonsmossgsss

s & &

o

«

Input

Impedance.

.

sseuevsin

s

v

s

vvsvmmnss

o ss

Maximu;x;

V

In;ut

............................

Operating

Modes

.

covinnsiiisssssmmnirisine

Chop

Frequency

..............oeeeeuuennnnn.

Channel

Separation

.........................

CH1

Signal

Oulput

,

..o

s

smmamen

s

s o s

s

CH2:

Polarity’

s«

5 » s

5

¢

sogesmmms

b+

45

4

HORIZONTAL

DEFLECTION

Sweep

IMode)

v

s

»

cevitisuis

5

=

s

§

5

»

596

SWeeD

TilDE

s

5 v

aemuiens

§ §

&

JEEmes

§ 5 4

59

Magnification

...............

...

ool

Sweep

Time

ACCUTACY

.

..«

.vvvvvnnennennnnn.

Trigger

Holdoff

Timei.

b

«

« »

wemmsrsmons

&

s

«

wa

s

Linearitye

woss

s ¢ 3

snomuens

5 5 §

o

uesme

¥

55

¢ 0

5

mV

to

5

V/DIV

=

3%;

10

steps

in

1-2-5

sequence

with

variable

control.

5

times

(1

mV/DIV

to

1

V/DIV

at

X5

MAG).

DC:

DCto

25

MHz

(DCto

15

MHz

at

X

5

MAG).

AC:

10

Hz

to

25

MHz

(10

Hz

to

15

MHz

at

x5

MAG).

Approximately

14

ns

(approximately

23

ns

at

x5

MAG).

Less

than

3%.

1MQ

shunted

by

25

+

3

pF.

400V

p-p,

or

200

V

(DC

+

AC

peak).

CH1,

CH2,

DUAL,

and

ADD.

Approximately

250

kHz.

Over

60

dB

at

50

kHz,

30

dB

at

25

MHz.

Approximately

100

mV/DIV.

-

Waveform

inversion;

variation

less

than

1

DIV.

AUTO,

NORMAL

and

SINGLE.

0.2

ps

to

0.5

s/DIV;

20

steps

in

1-2-5

sequence

with

variable

control

and

X-Y

mode.

X

10

(provides

sweep

time

of

20

ns/DIV).

3%

(6%

at

x

10

MAG).

Adjustable

to

longer

than

5

times

sweep

length

in

0.2

us/DIV

to

1

ms/DIV

ranges.

3%

(6%

at x

10

MAG).

Page

6

X-Y

Operation

...,

SensttiVILY,

.

wcssssins

«

5

o

sammomes

5

96

&

3

semEEE

Frequency

ReSpONSe

«

;s oo

owuvvissss

v

sswmnsvs

TRIGGER

INTENSITY

MODULATION

(Z-axis)

Input

Voltage

...............ccooiiinii.

...

Inputi

Resistants

s

&

sommamns

6 5

5

§

sussemnsg

Maximum

Input

............................

Frequency

Range

...........................

Mode

selected

with

SEC/DIV

switch:

CH1:

X-axis.

CH2:

Y-axis.

Same

as

CH1

vertical

axis.

DCto

1

MHz

(-3

dB).

CH1,

CH2,

LINE

and

EXT.

INT:

0.5DIV

from

DC

to

15

MHz.

1.5

DIV

from

DC

to

25

MHz.

EXT:

50mV

p-p

from

DC

to

15

MHz.

100

mV

p-p

from

DC

to

25

MHz.

AC,

HF

REJ,

TV,

and

DC.

HF

REJ:

Attenuates

signal

components

.above

50

kHz.

+0r

=,

AUTO,

NORM,

and

SINGLE.

Preset

level

from

50

Hz

to

25

MHz.

Input

Impedance:

1

MQ,

30

pF.

Maximum

Input:

100

V

(DC

+

AC

peak).

3

V

p-p

or

higher

(Bright

at

negative-going

input).

Approximately

5

kQ.

50

V

p-p

(DC

+

AC

peak).

DC

to

5

MHz.

Page

7

GENERAL

CRT

Accelerating

Voltage

....................

Approximately

2

kV.

Calibration

Voltage

. :

.cuusmiizin

¢

»

o

sionaavsiaiia

o

s

«

2V

p-p

*+

2%,

1

kHz

square

wave

(positive-going).

Power

Requirements

..............

...

117

V;

50/60

Hz;

approximately

35

VA.

FUBE

.«

covvmmmnn

»

¢

5

v

vammsen

5

o 5 %

%

s

2 5

1Afor117

V.

DIMensions

cwsms

s

555

amameis

55

¢

»

¢

e

o

12.4"”

W

X

6.5

H

x

17.1"

D

(315

X

165

X

435

mm).

WEIBHE

.

oonoliiths

o

bdeiutiie

8's

3

5

3

samaoni

i

s

5

Approximately

15.4

Ibs

(7

kg).

e

——

<

———

The

Heath

Company

reserves

the

right

to

discon-

tinue

products

and

to

change

specifications

at

any

time

without

incurring

any

obligations

to

incorpo-

rate

new

features

in

products

previously

sold.

Page

8

g

25

r@

Heath

25

MHz

osciloscope

{

Posirion

INTENSITY

Pocus

Tace

SeALC

o

50

G

@

POSITION

-

VARIABLE

UL

*

10

ARG

sngt

SWEEP

MODE

(nomw)

W0

woRm

gmet/minT

VERT

moo€

POSITION

CHI

DUAL

cn

q

Pt

voLTs/ov

0O

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veursrov

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anioLe

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10N:

FOR

CONTINUED

{Acamst

1

€

OF

SRR

Raries

(i

PrROTECTION

RE.

REPLACE

ONLY

WITH

THE

SPECIFIED

VOLTAGE

AND

AC

INPUT

l

@3

p

Figure

2

Page

9

OPERATION

CONTROLS

AND

CONNECTORS

Refer

to

Figure

1

and

Figure

2

as

you

read

the

follow-

ing

numbered

paragraphs.

1.

2.

10.

POWER

—

Turns

the

instrument

on

and

off.

CAL

2V

terminal

—

Provides

a

1

kHz

square

wave

output.

It

is

useful

for

checking

amplifier

gain,

waveform

compensation

of

probes,

etc.

INTENSITY

—

Adjusts

the

beam’s

brightness.

FOCUS

—

Adjusts

the

clarity

of

the

beam.

TRACE

ROTATION

—

Used

to

offset

the

ef-

fect

of

the

earth’s

magnetic

field

on

the

trace

line.

SCALE

ILLUM

—

Adjusts

the

scale

back-

ground

light.

POSITION/PULL

ADD

—

Positions

the

CH1

display

vertically.

In

the

X-Y

mode,

using

EXT

IN,

this

control

positions

the

CH1

Y-axis.

When

pulled

out

(ADD

mode),

the

CH1

and

CH2

input

signals

are

algebraically

added.

AC-GND-DC

(CH1

and

CH2)

—

AC:

The

signal

is

capacitively

coupled

to

the

vertical

amplifier

and any

DC

component

is

blocked.

The

low-fre-

quency

limit

(-3dB)

is

about

10

Hz.

GND:

Grounds

the

amplifier

input

and

opens

the

input

circuit.

DC:

All

components

of

the

input

signal

are

coupled

to

the

vertical

amplifier.

CH1

(X)

connector

— BNC

connector

con-

nects

the

input

signal

to

channel

1.

VOLTS/DIV

switch

(CH1

and

CH2)

—

Selects

deflection

factors

from

5

mV/DIV

to

5

V/DIV

in

10

steps.

11.

12

13.

14.

15.

16.

VARIABLE

VOLTS/DIV

control

(CH1

and

CH2)

—

Variable

controls

for

vertical

attenua-

tion.

Provides

continuously

variable

deflec-

tion

factors

(sensitivity)

between

the

steps

of

the

VOLTS/DIV

switch.

Normally

they

are

set

fully

clockwise

(CAL).

When

they

are

pulled

out,

the

sensitivity

is

magnified

by

a

factor

of

5.

VERT

MODE

selector

—

CH1:

Displays

Channel

1

only.

DUAL:

A

dual

trace

display

switches

be-

tween

CH

1

and

CH2,

with

alter-

nate

or

chopped

operation

con-

trolled

by

the

SEC/DIV

switch.

Chopping

occurs

at

approximately

250

kHz

on

the

0.5

s

to

1

ms/DIV

ranges

and

on

alternating

traces

on

the

0.5

ms

to

0.2

ps/DIV

ranges.

CH2:

Displays

Channel

2

only.

Ground

terminal

—

Provides

a

chassis

ground

that

is

connected

to

the

3-wire

AC

power

cord.

CH2

(Y)

connector

—

BNC

connector

con-

nects

the

input

signal

to

channel

2.

POSITION/PULL

INVert

—

Positions

the

CH2

display

vertically.

In

any

X-Y

mode,

this

con-

trol

positions

the

CH2

Y-axis.

When

it

is

pulled

out,

the

CH2

display

is

inverted.

HOLDOFF

—

Adjusts

the

time

between

sweeps,

and

is

used

when

the

time

base

trig-

gering

must

be

delayed

to

display

complex

waveforms

(e.g.

repetitive

complex

pulses).

When

you

turn

this

control

clockwise,

from

full

counterclockwise

(NORM),

the

holdoff

time

is

continuously

variable

from

no

delay

to

5

times

normal

sweep

time.

Operates

only

on

ranges

from

0.2

ws/DIV

to

1

ms/DIV.

Page

10

17,

18

19

20.

21.

22.

EXT

IN

—

A

BNC

connector

for

external

trig-

ger

signals.

In

the

X-Y

mode,

with

the

TRIG-

GER

SOURCE

switch

at

EXT,

the

signal

ap-

plied

to

this

connector

controls

the

X-axis

of

CH1

and/or

CH2.

LEVEL

—

Selects

the

starting

point

voltage

on

the

trigger

source

waveform

at

which

the

sweep

is

triggered.

Turn

the

control

fully

counterclockwise

to

FIX

(NORM)

for

a

fixed

level

(0

volts).

SOURCE

—

Selects

the

triggering

source

sig-

nal

as

follows:

CH1:

CH1

signal

for

triggering.

CH2:

CH2

signal

for

triggering.

LINE:

AC

line-frequency

voltage

for

trig-

gering.

EXT:

The

signal

applied

to

the

EXT

IN

connector

for

triggering.

COUPLING

—

Selects

the

triggering

mode

as

follows:

AC:

Trigger

signals

are

capacitively

coupled

to

the

trigger

circuitry.

Signals

below

10

Hz

are

at-

tenuated.

HF

REJ:

Attenuates

triggering

signals

above

50

kHz.

TV:

For

observing

TV

signals.

DC:

All

trigger

signals

are

directly

coupled

to

the

trigger

circuitry.

SLOPE

—

Selects

the

triggering

point

on

the

positive

or

negative portions

of

the

trigger

sig-

nal.

SEC/DIV

—

Selects

calibrated

sweep

rates

from

0.5

s/DIV

to

0.2

ps/DIV

in

1-2-5

sequence

(20

ranges).

At

X-Y

(fully

counterclockwise),

operation

is

for

the

X-Y

mode.

The

alternate

or

chop

and

TV-V

or

TV-H

operations

are

au-

tomatically

selected

by

the

switch.

23.

24.

25.

26.

27.

28.

29.

SWEEP

MODE

selector

—

AUTO:

For

normal

triggering.

Sweep

free-runs

in

the

absence

of

an

adequate

triggering

signal.

NORMAL:

For

normal

triggering.

No

CRT

display

in

the

absence

of

a

triggering

signal.

Allows

only

one

sweep

until

reset.

Reset

the

cir-

cuit

by

pushing

this

switch.

The

READY

lamp

indicates

when

the

circuit

is

ready

to

be

triggered.

.

SINGLE/RESET:

POSITION

—

Positions

the

CH1

and/or

CH2

trace

horizontally.

VARIABLE/PULL

X10

MAG

—

Provides

con-

tinuously

variable

sweep

rates

to

approxi-

mately

2.5

times

the

calibrated

setting.

At

the

CAL

position,

the

sweep

rate

is

set

by

the

SEC/DIV

switch.

When

you

pull

this

VARI-

ABLE

switch

out,

the

sweep

speed

is

ex-

panded

10

times.

Z

AXIS

INPUT

connector

—

A

BNC

input

connector

for

intensity

modulation

of

the

CRT

trace.

OUTPUT

connector

—

This

BNC

output

con-

nector

provides

the

signal

from

the

CH1

verti-

cal

preamplifier.

Fuseholder

—

Holds

the

AC

line

fuse.

The

rating

is

given

in

the

nearby

table.

AC

INPUT

socket

—

Receptacle

for

the

3-wire

AC

power

cord.

Heath Zenith SO-4226 Manual de usuario

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