Hitachi V-212 User manual

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1

Table of contents

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WARRANTY

This

Hitachi

Denshi,

Ltd.

product

is

warranted

against

defects

in

workman

ship

and

materials.

If

any

failure,

resulting

from

a

defect

in

either

workman

ship

or

material,

shall

occur

under

normal

use

within

one

year

from

the

original

date

of

purchase,

such

failure

shall

be

corrected

free

of

charge

to

the

original

purchase

by

repair

or,

at

Hitachi

Denshi's

sole

option,

replacement

of

the

defective

part

or

parts.

No

charge

shall

be

made

for

labor

or

services

performed

during

said

one

year

period

providing

the

product

is

brought

to

our

Authorized

Service

Station.

Hitachi

Denshi,

Ltd.

further

warrants

to

the

original

purchaser

that

upon

expiration

of

the

one

year

free

service

warranty

period

and

within

two

years

from

the

original

date

of

purchase.

Hitachi

Denshi,

Ltd.

will

either

repair

or

at

its

sole

option,

replace

any

part

except

for

cathode

ray

tube,

fuses,

probes,

lamps,

batteries

and

other

optional

materials

which

are

defective

in

either

workmanship

or

material

under

normal

and

proper

use.

After

the

expiration

of

the

one

year

free

service

period

and

during

the

addi

tional

period

covered

by

two

years

parts

warranty,

a

reasonable

charge

will

be

made

for

labor

or

service

performed.

This

warranty

does

not

cover

equipment

which

has

been

tampered

with

in

any

way,

or

damage

caused

by

accident,

negligence,

alteration,

or

misappli

cation.

This

product

must

be

returned

transportation

prepaid,

properly

packed

and

insured.

This

warranty

applies

only

to

the

original

purchaser.

NO

OTHER

WARRANTIES

ARE

EXPRESSED

OR

IMPLIED.

Hitachi

Denshi,

Ltd.

IS

NOT

LIABLE

FOR

CONSEQUENTIAL

DAMAGES.

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CONTENTS

MODEL

V-212/211

1.

2.

3.

4.

5.

6.

7.

10.

11.

12.

1

Features

1

Accessories

2

Precautions

.

.

7

Controls

and

connectors

How

to

obtain

the

displays

17

Method

for

connecting

signals

,

20

Measuring

procedure

28

Adjustments

Maintenance

^

.

29

Specifications

External

view

35

Schematic

diagrams

NOTE

o

This

instrument

should

be

adjusted

at

an

ambient

temperature

of

+20°C

for

best

overall

accuracy.

Allow

at

least

15

minutes

warmup

before

proceeding,

o

Polyvinyl

chloride

(PVC)

film

is

attached

on

the

enclosure

and

the

front

panel

of

the

oscilloscope

to

protect

the

metal

surface.

If

the

PVC

film

is

damaged

by

scratches,

remove

it.

o

To

clean

the

enclosure

or

the

front

panel,

use

neutral

detergent.

Refrain

from

using

thinner,

benzine,

alcohol

or

other

chemicals.

o

For

safety

operation,

be

sure

to

connect

the

ground

lead

of

the

GND

(ground)

terminal

to

earth

ground,

if

a

two-wire

AC

power

system

is

used.

Failure

to

complete

the

ground

system

may

allow

the

chassis

and

cabinet

of

this

instrument

to

be

elevated

above

ground

potential

and

pose

a

shock

hazard.

1

FEATURES

The

Hitachi

V-212

[V-211]

*

is

a

portable-type,

advanced-

class

oscilloscope

with

a

bandwidth

of

DC

to

20

MHz

designed

with

the

emphasis

on

operability

and

portability

and

has

follow

ing

features.

♦[

]

:

Specifications

of

V-211

(1)

Wide

bandwidth:

The

instrument

has

a

bandwidth

from

DC

to

20

MHz.

(2)

High

sensitivity:

Sensitivity

is

1

mV/div

(3)

Large

6"

screen:

Employment

of

a

large

square

CRT

makes

waveforms

easier

to

observe.

(6)

TY

synchronization:

Employment

of

a

new

TV

sync

separator

circuit

allows

the

instrument

to

observe

TV

signals

stably.

2.

ACCESSORIES

□

This

instrument

is

shipped

with

the

following

standard

accessories.

2

[1]

Probes

(AT-lOAJ

1.5)

1

AC

power

supply

cord

1

Operation

manual

(4)

Internal

graticule:

Employment

of

an

internal

graticule

CRT

permits

waveforms

observation

to

be

made

without

parallax

error.

(5)

ALT

TRIG

Even

an

observation

of

two

waveforms

of

different

frequen

cies,

the

waveform

of

the

each

cannel

is

stably

triggered.

(V-212

only)

3.

PRECAUTIONS

Precautions

to

be

observed

to

lengthen

the

service

life

of

this

instrument.

Installation

site

*

Avoid

installing

instrument

in

an

extremely

hot

or

cold

place.

o

Avoid

placing

this

instrument

in

a

place

exposed

to

sun

light

for

a

long

period

of

time,

in

a

closed

car

in

mid

summer,

or

near

a

room

heating

device

such

as

a

stove,

o

The

operating

maximum

ambient

temperature

is

-h40°C.

*

Do

not

use

instrument

that

has

been

left

outdoors

on

a

cold

winter

day.

The

operating

ambient

temperature

is

0°C

or

more.

/■9

Avoid

moving

the

instrument

rapidly

from

a

hot

place

to

a

cold

place

or

vice

versa,

or

condensation

may

form

inside

of

the

instrument.

Keep

the

instrument

away

from

damp

air,

water,

and

dust.

Unexpected

trouble

may

be

caused

when

the

instrument

is

placed

in

a

damp

or

dusty

place.

The

operating

ambient

humidity

is

35—85%.

Since

an

accidental

intrusion

of

liquid

may

also

cause

troubles,

do

not

place

a

liquid-filled

containers

such

as

a

vase

on

the

oscilloscope.

Do

not

place

the

instrument

in

a

place

where

vibration

is

strong.

Avoid

using

the

instrument

at

a

place

vibrating

violently.

Since

the

oscilloscope

is

a

precision

instrument,

excessively

strong

vibrations

may

cause

damage.

Do

not

place

the

instrument

near

a

magnet

or

magnetic

body.

An

oscilloscope

is

an

equipment

using

electron

beam.

Therefore,

do

not

bring

a

magnet

close

to

the

instrument

or

do

not

use

the

instrument

near

an

equipment

generating

strong

magnetic

force.

Handling

*

Do

not put

a

heavy

objects

on

the

oscilloscope.

*

Do

not

block

the

ventilation

holes.

*

Do

not

apply

a

heavy

shock

to

the

oscilloscope.

*

Do

not

insert

a

wire,

pin,

etc.

through

the

ventilation

hole.

*

Do

not

drag

the

set,

leaving

the

probe

attached

to

it.

7

■7

T'

77///

/

>V

/7

/

/

When

not

in

use

When

not

in

use,

put

the

dust-proof

cover

on

the

instrument

and

store

it

with

care.

♦

Do

not

leave

a

hot

soldering

iron

on

the

cabinet

or

the

screen.

*

Do

not

try

to

turn

the

instrument

upside

down.

Otherwise,

knobs

may

be

broken.

*

Do

not

use

the

instrument

upright,

leaving

BNC

cable

connected

to

EXT

BLANKING

terminal

on

the

rear

panel.

Otherwise,

the

cable

may

be

damaged.

When

operation

is

faulty

Recheck

the

operating

procedure

and

if

problem

persists,

contact

a

nearly

service

station

or

agent.

Care

and

repair

*

Removal

of

stain

from

the

case.

o

When

the

outside

of

the

case

is

stained,

remove

the

stain

by

fi

rst

wiping

it

lightly

with

a

cloth

moistened

with

neutral

washing

agent

and

then

wipe

the

surface

with

a

dry

cloth.

*

Never

use

strongly

volatile

agent

such

as

benzine

and

thinner.

o

When

the

panel

surface

is

stained,

remove

the

stain

in

similar

way

with

a

clean,

soft

cloth.

When

heavy

stains

are

present,

fi

rst

remove

the

stains

by

wiping

the

surface

lightly

with

a

locth

moistened

with

diluted

neutral

wash

ing

agent

or

with

alcohol

and

then

wipe

thoroughly

with

a

dry

cloth.

o

When

dust

has

accumulated

on

the

inside,

remove

it

by

using

dry

brush,

or

by

using

the

exhaust

of

a

compressor

or

a

vacuum

cleaner.

By

a

SERVICE

PERSONNEL.

NOTE:

When

opening

the

case,

pull

out

the

power

supply

plug

beforehand

without

fail.

When

cleaning

the

inside,

insure

beforehand

that

no

electricity

remains

in

the

condensers

of

the

power

supply

circuit.

"NOT

FOR

AN

OPERATOR"

*

Cleaning

of

CRT

Dirty

surface

of

CRT

screen

tends

to

cause

measuring

errors.

The

screen

surface

becames

accessible

when

the

bezel

is

re

moved.

Remove

the

stains

on

CRT

and

filter

by

using

a

clean

and

soft

cloth,

paying

attention

not

to

impair

them.

When

the

stain

is

extremely

heavy,

wash

them

with

neutral

washing

agent

and

then

leave

them

stand

until

the

moisture

is

removed

naturally.

o

If

the

screen

is

installed

while

it

is

moistened,

water

rings

may

be

formed

and

the

waveform

may

be

blurred

to

become

hard

to

observe.

Pay

attention

not

to

leave

finger

prints

on

it.

CRT

Filter

Operation

precautions

*

Check

the

line

voltage.

The

operating

voltage

range

of

this

oscilloscope

is

as

shown

below.

Check

the

hne

voltage

without

fail

before

turning

on

the

power

switch.

Rating

Line

Voltage

(50/60Hz)

ACIOOV

AC

90V-

llOV

AC120V

AC

108V-

132

V

AC220V

AC198V-242V

AC240V

AC216V

-

264V

Nominal

volts

±5%

at

400Hz.

In

the

case

of

normal

shipment,

the

voltage

selector

will

be

set

convenient

for

user.

When

it

is

intended

to

use

the

oscilloscope

on

another

voltage

rating,

voltage

selector

can

be

turned.

(Rated

voltages

are

indicated

on

the

rear

panel

of

the

oscilloscope.)

*

Use

only

specified

fuses.

In

order

to

protect

the

circuit

against

overcurrent,

a

fuse

of

2A

(for

ACIOOV

or

AC120V)

or

lA

(for

AC220V

or

AC

240V)

is

used

on

the

primary

side

of

power

supply.

When

this

fuse

is

blows

out,

check

thoroughly

the

cause,

repair

any

faulty

point

present,

and

then

replace

with

a

specified

fuse.

Do

not

try

to

use

the

fuse

other

than

the

specified

ones.

Otherwise,

fault

may

be

caused

or

danger

may

be

invited.

(Particularly,

do

not

use

a

fuse

different

from

the

specified

one

in

current

capacity

and

in

length.)

The

standards

of

the

fuses

are

as

follows.

Dimensions

(Diameter

x

length)mm

Type

number

2A

6.350x31.8

MF61NM250V

2A

AC

lA

6.350x

31.8

MF61NM250V

lA

AC

*

Do

not

increase

the

brightness

too

much.

Do

not

increase

the

brightness

of

the

spot

and

trace

too

much.

Your

eyes

may

be

strained

and

the

fluorescent

sur

face

of

CRT

may

be

burnt.

*

Do

not

apply

an

excessive

voltage.

The

input

withstand

voltage

of

each

input

connector

and

probe

input

is

as

follows.

Never

apply

a

voltage

higher

than

specified.

INPUT

direct,

300V

(DC

+

AC

peak

at

1

kHz)

When

probe

is

used

400V

(DC

+

AC

peak

at

1

kHz)

EXT

TRIG

INPUT

EXT

BLANKING

Calibration

Interval

30dV(r)C+ACpeak)

30V

(DC

+

AC

peak)

To

maintain

instrument

accuracy,

perform

the

calibration

of

the

V-212[V-211]

at

least

every

1000

hours

of

opera

tion,

or

every

six

months

if

used

infrequently.

4.

CONTROLS

AND

CONNECTORS

□

(1)

Power

supply

and

CRT

Operating

voltage

and

fuse

This

model

can

be

operated

from

either

a

100-volt,

a

120-volt,

a

220-volt

or

a

240-volt

nominal

line

voltage

source.

The

line

Voltage

Selector

on

the

rear

panel,

converts

the

instrument

from

one

operating

range

to

another.

In

addi

tion,

this

Selector

changes

the

primary

connections

of

the

power

transformer

to

allow

selection

of

one

of

four

regu

lating

ranges.

The

Selector

also

includes

the

line

fuse.

Use

the

following

procedure

to

convert

this

instrument

be

tween

nominal

line

voltage

or

regulating

ranges.

1.

Disconnect

the

instrument

from

the

power

source.

2.

To

convert

from

100-volts

nominal

to

220-volts

nominal

line

voltage

or

vice

versa,

pull

out

the

Volt

age

Selector

switch,

and

plug

it

back

into

the

desired

holes.

Change

power-cord

set

to

match

the

power-

source

outlet.

3.

Before

applying

power

to

the

instrument,

check

the

voltage

indicator

tabs

on

the

Selector.