Micronta 22-211 User manual

MICRONTA:'

20.000

OHMS;VOLT

FOLDING

MU

LTITESTER

INSTRUCTION

MANUAL

CAT

.

N0.22-21

1

CU

STOM

MA

NUFAC

T

URED

FO

R

RAOIO

SHA

CK, A DIVISION

OF

TAN

OY

CORPO

R

ATIOI

SCHEMATIC DIAGRAM

6A9

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RADIO SKACK

A

Division

of

Tandy

Corporation

Fort

Worth,

Texas

76102

Printed

in

HONG

KONG

811012170C

INTRODUCTION

This

com

pact, sensitive Multitcster isdesigned

tomeasure

AC and

DC

voltages,

OC

current,

and

resis

tante

wîth

ac

·

curacy

and

ease.

The

single

knob

fu

nction

control

îs

easv

to

read and use.

The

4"

(10

cm}

meter

in

corpor

ates a

mirrored

scale

for

accurate readings and uses three colors f

or

rapid scale

id

entifica

ti

on.

The

meter movement is shunted,

for

protection,

du

ring

transit.

This

is accomplished automâtically every

time

the

Multites

te

r îs folded

shut.

The

meter

circuit i

ncorporates

a fuse

to

protect

the

de

licate

meter

movement

and

other

internai

parts

in case

of

inadvertent

overload

or

improper

function

selection.

The

operating

and indicating sections

are

connected

to

each

other

by

a hinge-joint wi

th

detent.

This

atlows

the

user

to

get

an

optimum

angle f

or

eas:y reading

in

ali operating

pos

i

tions

eîther

wh

en

portable

or

on

bench

top.

44"

(1

tO

cm)

weil insulated

test

lea~s

with

banana·

type

plugs

result

in firm, safe,

low

·resistance

circuit

con·

nections.

Small

and

light, this:

instrument

will

pr

ovîde

man

y

yea

rs

of

accurate voltage,

current

, and resistance meas

urement

s.

One

AA

cell provides

power

for

resistance measurement.

@

Copyright

1989

.

Tandy

Corporation

-2-

SPECIFICATIONS

Ranges:

OC Voltage

AC Voltage

OCCurrent

Resistance

Dec

ibels

Output

25

0

-0

.6-3-15-60-300-600-1

200V

0-15-60-150-60Q-1200V

0·60

!IA·3-3Q-300

mA

0·2K.

0·20K,

0-

200K

, 0-2Meg. (centec

sca

le

24)

-2

0

to

+

63

dB

in 5 ranges

0·15·60-150

-600

V

Accuracy

(at

horizontal

position):

±3%

of

full-scale, OC

voltageandcurrent

±4%

of

fuU-sc_ale, AC 110ltage

±3%

of

scale·length, Resistance

Influence

of

Scale Angle

(at

vertical position);

±2%

of

full scale

Sensitivity:

20,000

ohms/volt

DC

10,000

ohms

/voltAC

Meter

Movement:

Oetent:

Batt

cry:

leads:

Fuse:

Size:

Weight:

4"

(10

cm}, 3

-c

olor

, mirrored scale,

37

JJ.A

movement

90

, 120. 150,

180

degcees

Requires

one

type

AA penlight

ce

li

for

ohms:

functîon

44"'

(110cm)

banana-plug

styl

e

0.5A,

250V

fast·acting, 5.x20 mm

typ

e

7.3H x 4.4W x

1.30

inches

18.4H

x

ll.OW

x

3.30

cm

(tu

ll

y open)

4H

x

4.4W

x 2.SD inches

lO.OH x

11

,

OW

x 6.

30

cm

(fu

fly

closed)

350g(0.81b<.l

-

3-

TO

USE

The

fo

l!

owing special markings

are

designed

to

remind

you

of

safety.

&.Ref

er

to

the

followlng operating instructions.

@ To avold eleetrical shock and/or instrument damage

do

no

t connect

th

e

common

input

te

rm

inal

(-jack)

to

any

source

of

more than

500

volts with respect

to

earth/

ground.

Press latch on the front

of

case

to

open.

Remove

banery

cover

and

install

one

AA cell

tnot

sup-

plied).

We

recommend

our

23·582

or

23·552.

Be

sure

to

obserVe

proper

polarity. Close t

he

cover. ·

When

vou

can't adjust the pointer

to

"0"

on OHMS ra

ng«,

it's time for a new

battery.

Never leave a weak

or

de

ad

battery

in

your

uni

t. Even a " lea

k·proof"

battery

may

lea

k damaging chemicals. Also, if

vou

are

not

go

ing

to

use

your

unit

for

aweek

or

more, remove the battcry.

Notes:

For

most accurate readings, keep the me

ter

lyi

ng

f

la

t

on

a

non·me

ta

ll

ic surface.

Us

e a range

setting

that

re-

sul

ts

in a r

ead

ing in

th

e

upper

l/3rd

of

the

meter

scale.

Also, l

oo

k

at

th

e scale

from

the

point

where

the

poi

nt

er

and

its mi

rror

r

ef

l

ect

i

on

come

togethar;

ot

herwise y

our

reading

wi

ll

be inaccur

ate

due

to

para

ll

ax.

The poi

nte

r m

ay

shih slightly from

the

"0"

position as

y

ou

ch

ange

the

angle

of

the

meter

section.

-4-

1f the poi

nte

r does

not

normally rest

cxac

t

fy

over

th

e

"

0"

at

tk

e le

ft

side

of

the

scale,

adjuu

the

plastic screw

in

the

lo

wer

center

of

the

meter

face

to

bring

the

needle

!0 "0

."

Always observe

correc

t

test

lead polaritv

when

making

OC

voltage

and

current

measurements (Black in

to

the8

COM a

nd

Red

into

the0V

·n·A

or

OCSOOV

or

DC1200V

jacks).

CAUTION: THE MAXIMUM INPUT

LIMIT

FOR

VOLTAGE

AND

CURRENT MEASUAEMENT BE·

TWEEN 0

v.n.A

AND

8 COM

IS

600V AC,

300V OC

AND

300mA

OC.

TEST

LEAD

S

Use

only

the

same

type

of

tenlellds atthose

supplie<!

with

your

unit.

These

test

leads are rated for

1200

volts; replace-

ments

are

available from

your

local RadioShack

store.

OC

VOLTAGE

MEASUREMENTS

WARNING

~

US

E EXTREME CARE WHEN

MAK

·

ING MEASUREMENTS FOR HIGH VOLTAGE;

DO

NO

T TOUCH TERMI

NA

LSOR

PROBE

EN

DS

.

1. Plug t

he

te

st

leads i

nto

th

e

correct

jacks (Black into 8

COM

and

Red

i

nt

o 0 V

·n

·

AI.

2. Set

the

ra

ng

e switch

to

one

of

the

CCV pos

it

ion

s;

it

is ·

best

to

start

at t

he

top

and

w

ork

do

wn.

lf

you're

unce

rt

aln

about

voltage revel,

stan

with 1

20

0V

rangeas noted in st

ep

5.

-5-

3.

Touch

the

test

pmbe

tips

to

the

circuit 'Jnder test;

be

sure

to

observe correct polaritv.

4.

Rcad

the

voltage

on

the

black DC scales.

S. For voltages between

300

and

600.

set

the

range switch

ta

300&UP and plug the ted test lead into

the

DC600V

jack. For voltages between

600

and

1200.

leave

the

range

at

300&UP and

plug

the red

test

lead

into

the

DC1200V jatk.

USE

EXTREMECAREWHENUSING THESE RANGES.

AC

VOLTAGE

MEASUREMENTS

WARNING ) USE EXTREME CARE WHEN

MAK-

ING MEASUREMENTS FOR HIGH

VOLTAGE;

DO NOT TOUCH TERMINALS

OR

PROBE

ENDS.

1. Plug

the

test

leads

into

the

cor'rect jacks.

2.

Set

the range switch

to

one

of

the

ACV positions.

(lt

is best

to

start

at

the

top

and

work

dawn.)

If you're uncertain

about

voltage leve!, start with 1200V

range as noted in

step

5.

3. T

ouch

the

test probe tips

to

the

circuit

under

test.

4.

Read

the

voltage

on

the

red AC scales.

5.

For

voltages between

600

and

1200, set

the

rangeswitch

to

600&UP and plug

th

e red test lead ln

to

the

AC1200V

jack.

-6-

, RESISTANCE MEASUREMENTS

Before taking

any

resistance measurements, disconnect

the

power

to

the

unit

under

test

and discharge

the

capacitors.

1t

is best

to

remove batteries and unplug lîne cards.

WARNING t DO NOT APPLY VOLTAGE

TO

MEASURING TERMI

NAL

WH

ILE

RANGE SWITCH

IS

IN

OHM POSITION.

1. Plug the test

leads

into

the 8 COMand

(!)V.fl-Ajatks.

2.

Set

the

range switch

to

onè

·

of

the OHMS positions;

touch

the

test

probe

tips

to

.g

ether

and adjust

the

OHM

ADJ

UST

control

to

brîng

the

pointer

to

the

"0"

on

the

top

(green) OHMS scale.

3.

Now,

touch

the

probe tips across

the

circuit

or

part

under

test.

4.

Read

the

resistance

on

the green OHMS scale;

use

the

proper multiplier

to

obtain

the

co~rect

value (R times

1.

1

O.

100

,

or

1000, depending

on

the

position

of

the

range switch).

Notes: When you

are

unable

to

·adîust

the

pointer

to

"0"

on

the

OHMS scale, the

battery

must

be

replaced, When

measuring resistance,

it

is best

to

disconnect

one

side

of

the

part

und

er test.

(The-

remainder

of

the

circuit will

not

interferewith

the

r'eadings.)

Note

for Testing Semiconductor

Junc

tions: When

attempt-

ing

to

ident

ify cathode and anode ends

or

the

type

of

tran-

sistor (PNP

or

NPN),

the

actual

po

l

arity

of

the tester's

voltage is opposite

of

the

lead colors.

The

red

lead is

the

negative source.

The

black lead

Js

positive.

- 7-

OCCURRENT

MEASUREMENTS

WARNING

~DO

NOT

APPLY

VOLTAGE

TO

MEASURI

NG

TERMINAL

WH

ILE

RANGESWITCH

IS

IN

CURRENT POSITION.

1. Plug

the

test

leads

into

th

e

correct

jacks.

2.

Set

the

range

switch

to

the

300m

DCA

position

{300

milli

ampl.

Always

start

at

the

t

op

and

work

down.

3. Open

up

the

circuit

in

which

you

want

to

measure

the

current

and

connect

the

blélck lead

to

the

negat

ive side

and

the

red lead

to

the

pos

itive side

of

t

he

circuit

.

4.

Apply

power

to

the

circuit

undcr

test

and

read

the

current

on

the

black

OC

sca!es.

DE

CIBEL

MEASUREMENTS

1.

Plug

the

test

leads

into

the

correct

jacks.

2.

Set

the

range switch

to

one

of

the

ACV ranges.

3.

For

a range switch

setting

of

15

ACV,

read

dB

directly

on

the

bottom

scale

in

dB.

For

other

senings

of

the

range

switch,

add

the

appropriate

number

of

dB

to

the

dB scale reading 'as

noted

on

the

chart

at

the

lm.ver

ri

ght

on

the

meter

face.

Note:

For

absolute

dB

measurements,

cir

c

uit

impedance

must be

600

ohms

. 0

dB

= 1 milliwatt dissipated

in

a

600

ohm

impedance (equivalent

to

0.775 volts across

600

ohms).

- 8-

OUT

PU

T

VOLTAGE

MEASUREMENTS

1.

To

measure

AC voltage

in

the

presence

of

OC voltage,

use

the

output

fonction.

Connect

the

black

l

ead

to

the

8 COM jack and the red l

ead

to

the OUTPUTjack.

2.

Set

the

range

sw

i

tth

to

an

ACV

pos:ition

and

rneasure

t

he

voltage in

the

circuit.

Note

:

The

output

functîon

î

ncorporates

a

OC

blocking

capacitor, rated at 600

vo

lts.

Do

not

exceed

the

600

vo1t

rating

when

measuring

output

voltages.

3.

Read

output

voltages

on

th

e

same

scales as

for

AC

voltage.

REPLACEMENT

OF

BATTERY/FUSE

WARNING

}'

TO

AVOlD

ELECTRIC SHOCK, DIS-

CONNECT MEASURING

TERMINAL$

BEFORE

REMOVING

BATTERY

DR

FUSE. REPLACE

ONL

Y

WITH

SAME TYPE

BATTERY

OR

FUSE.

THIS INSTRUMENT

CONTAINS

NO

USER SERV-

ICEABLEPARTS.

SCREW

REMOVAL

8Y

OUALIFIED

PERSONS

ONLY.

CAUTION:

FOR CONTINUED PROTECTION

AGAINST

FIRE,

REPLACE

ONLY

WITH

O.SA,

250V

FUSE.

-9-

NOTE:

The

fuse used in y

our

Multitester

is

a special size

and

type.

Replacement

fuses

may

be

obtained

from

your

local Radio

Shack store.

1. Oisconnect

the

test

leads.

2.

Open

the

battery/fuse

compartment

cover.

3.

Pull

the

red

ribbon

in

the

fuse

compartment.

The

fuse

will

pop

out.

4.

lnsert

a

new

fuse

on

the

ribbon

ring. Use

onfy

a fuse

of

the

s3me

type/rating

(0.5A, 250V. Radio Shack Cat.

No.

270.1241).

5.

lnstall

the

fuse

with

ribOon in

the

fuse

compartment.

6. Close

the

battery/fus.e compartmentcaver.

7,

$pace

is provided

in

the

battery/fuse

compartment

fo

r

a'

sp

are fuse.

lt

pays

to

carry spares!

WARNING

~

00

NOT OPERATE YOUR

UNIT

UNTIL

THE BATTERY/FUSE COVER IS

IN

PLACE AND

FULL

Y CLOSED.

WARNING:

USf

EXTREME CAUTION IN THE

USE

OF

THIS DéVICE.

IM

PAOPE.R

USE OF THIS

OEVICE

CAN

RESUlT

IN

INJIJRY

OR

OEATH.

fOLLOWALl

SAFEGlJAADSSUGGE$TED IN THE 0VVNER'S

MANUAL

IN

AODITION TO NORMAL SAfETY PRECAUTIONS IN

OEAUNG

WITH

ELECTRICAL CIRCUITS. DO NOT USE THIS DEVI

CE

IF VOU ARE UNFAM1UAR WITH

ELECTR1CAL

CIRCU1TS

AND

TESTING

PROCEDURES.

-10-

GOOD

METER

MEASUREMENT

PRACTICES

Here are sorne

good

general

ru

les

that

apply

to

the

use of

electrical meters.

Some

are common·sense.

some

are

safety

precautions

.

and

sorne

are

just

plain

good

habits

to

get

into.

1. CAUTION:

There

is always

the

possibility

of

dangerous

voltage being present

in

any piece

of

elect

rical/e!ectronic

e

quipment.

Always

use ex.treme

caution

when

making

measurements-

high voltage

may

appear

at

unexpected

points

in a suspected defective circuit.

2.

When making measurements. n

ever

stand

on

a

wet

or

damp

floor.

Do

not

work

near

(or

on)

any

grounded

meta

l

pa

rt

of

the

test

probes

{or

circuit

points).

4.

Ncver use

test

leads

with

frayed

or

broken

insulation;

voltages

will

appear

at

ali

exposed

contact

points

on

tneleads.

5.

Never

attemp

t

to

measure voltages

or

currents

above

the

specified

maximum

the

meter

ts designed

fo

_r; refer

to

the

specifications section.

-11-

6.

Fo

r s

afety'

s sake,

disconnect

leads.

as

soon

as

you've

completed

meas.urements.

7. Always

turn

off

th

e

unit's

power

before

connecting

test

leads.

This

is

especially

truc

when working

on

circuits

with

lOO

or

more

volts.

8.

Get

into

the

habi

t

of

keeping

on

e hand

in

your

pocket

when

troub

le

-shooting

any

equipment

containing

high

voltage

circuitry.

Using

only

on

e

hand

decreases

the

chance

of

electric

shock.

9.

You

should

remember

that

even a small

shock

can

be

dangerous,

fo

r

your

body's

reaction

to

a

miner

shock

can

cause

you

to

bump

or

fall against a higher·voltage

contact.

10. Discharge filtcr capacitors before connecting te$t leads:

such

capacitors

-

cao

retain hazardous.

charges

in

units

with

high

voltage

circuits.

T1. When making voltage and

eurre

nt

measurements

a/ways

start

with

the

highest

range avallable.

12. Never

attempt

to

mea.sure a voltage

when

the

_

function

is

set

to

res.istancc

or

cur

rcnt.

Ut

may

burn

out

the

meter

movement

or

ether

cirtuitry.)

Never

attempt

to

measure

current

with

the

meter

set

for

resistance.

13.

Never

attempt

to

measure

AC

voltages

or

current

with

the

meter

set

to

a

OC

mode.

iMeter

circuitry

Can

be

damaged.)

-1

2-

t4.

Do

not

attempt

to

measure

RF

voltages

with

the

meter.

Ot

can

be

damaged

or,

at

best,

the

readings will

be

meilningless.)

t5.

Do

not

expose

your

meter

to

moistorc;

avo

id

hfgh

humidity

and

excessive

dust

and

dirt.

16. Avoid

vibration

or

mechanical shock;

the

Meter

might

be

damaged

or

its

accvracy

affected

.

17. Avoid osing meters in locations

with

high

magnetic

fields. (lnaccurate mea

..

urements

can

result.)

18.

Remember

that

voltage

and

resistance

measurements

are

made

with

the

Meter

connected

in parallel.

Current

measurements

are

made

with

th

e

meter

connected in

suies.

-13-

1

:;:

1

.!.

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1

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~~

,

...

om

~

:JI

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;;;

~

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or purcha:st

ltom

Fbdlo

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ac

ll.

compa"'Y·

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and

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ued

Ra

dio

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ll.

lt

anc

hlsce

s

and

dea

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rs W1thtrt

this pertod, wo

wt

11

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Wt

thou

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patt

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abo

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O'lny

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Micronta 22-211 User manual

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