Metex Testlab y122hu User manual

DIGITAL

MULTIMETER

Cat.

No.

Y122HU(M3850)

Operating

Manual

PINCroy

(

al

ae

SET/pe.

ie

oe,

iia

By.

a

<=

te,

TUV

Rheinland

Front

Panel

.

Power

Button

.

Function

Button

.

Set/Reset

Button

.

DCQ/AC

Button

Up

Button

.

Down

Button

.

Back-Light

Button

.

Transistor

Socket

_

9.

Capacitance/Temp.

Socket

C5

O

Tee

10.

Rotary

Switch

te

11.

20A

Terminal

12.

mA

Terminal

13.

COM

Terminal

14.

V/QO

Terminal

15.

LCD

(33/4

digit,

Max

4000)

16.

Analogue

Bargraph

17.

Bargraph

Scale

19

20

21

22

23 30

31

H)(O

H)(MIN}(MAX)(REL)

pq

FREO

oT

OTe

WG

Ox]

24.

25.

26.

27,

28

(ACL)[RH)(ouaL)(CcOMIEE

AC

PADIS

IA

29

(ai

Ne

-_,

=,

*"

ic

32,

33

acwin

B

4

')

yd

)

x

)

AE

MkH

34

,

35

37

39

Te

CO

(04

2

pmVA

CAP

o

ine

MK

hFE

'

LOGI

Crete

.

Overload

Indication

.

Auto

Hold

.

Data

Hold

.

Minimum

.

Maximum

.

Relative

.

Memory

.

Memory

Recall

.

Range

Hold

.

Dual

Display

.

Communication

.

Comparison

.

Address

Number

.

Diode

Test

.

AC

Current

or

Voltage

.

Continuity

Test

.

Negative

Polarity

.

Frequency

.

Temperature

.

Capacitance

.

Transistor

hFE

.

Logic

Test

.

Sub

Display

.

Low

Battery

Indication

.

Annunciators

SS

a

RB

SB

TY

a

Safety

Information

This

meter

has

been

manufactured

and

tested

in

accordance

with

IEC348

and

DINS57411/

VDE0411

part

1:

Safety

requirement

for

elec-

tronic

measuring

apparatus,

safety

class

II

This

manual

contains

information

and

warnings

which

must

be

observed

to

assure

safe

operation.

Safety

Symbols

The

following

symbols

have

been

placed

on

the

meter

to

remind

you

of

measurement

limitations

and

safety.

20A

The

maximum

current

that

can

be

measured

at

this

terminal

is

20A

DC/AC.

This

terminal

is

fuse

prot-

ected.

When

using

this

range

with

high

current

keep

the

duty

cycle

to

30

seconds

on

load,

15

minutes

off

load.

mA

The

maximum

current

that

you

can

measure

at

this

terminal

is

400mA

DC/AC.

This

terminal

is

protected

by

a

400mA

fuse.

MAX

===1000V

750V

2

AN

[a]

To

avoid

electric

shock

or

damage

to

instrument,

do

not

connect

the

com-

mon

input

terminal

to

any

source

of

more

than

500

volts

with

respect

to

ground/earth.

The

maximum

voltage

this

meter

can

measure

is

1000V

DC

or

750V

AC.

Be

exceptionally

careful

when

me-

asuring

high

voltages.

DO

NOT

TOUCH

THE

TERMINALS

OR

PROBE

TIPS.

Refer

to

the

instructions.

complete

operating

This

symbol

indicates

class

II,

double

insulation.

Safety

Warnings

To

avoid

electric

shock

and/or

damage

to

the

meter,

do

not

attempt

to

measure

any

voltages

exceeding

1000V

DC

or

750V

AC.

To

avoid

damage

to

the

meter

and/or

possible

personal

injury,

observe

the

input

limits

as

stat-

ed

in

table

1.

To

avoid

damage

to

the

meter,

disconnect

the

test

leads

from

the

test

points

before

changing

the

function/range.

To

avoid

electric

shock,

be

careful

when

work-

ing

with

voltages

above

60V

DC

or

25V

AC

as

these

voltages

pose

a

shock

hazard.

The

20A

current

range

is

protected

by

a

fuse.

To

'

avoid

damage

or

personal

injury,

only

use

this

meter

with

circuits

which

are

protected

with

a

cir-

cuit

breaker

or

fuse

of

up

to

20A

or

4000VA.

Do

not

apply

voltage

between

the

20A

or

mA

and

COM

terminals.

Do

not

allow

the

meter

or

test

leads

to

get

wet.

Before

making

any

measurements,

make

sure

that

the

test

leads

are

in

good

condition.

Table

1.

FUNCTION

V

DC

V

AC

INPUT

LIMITS

750V

AC

250V

DC/AC

400mA

DC/AC

TERMINAL

V/Q+COM

mA

DC/AC

200A

DC/AC

|

20A+COM

Diode/Buzzer

|

V/Q+COM|

250A

DC/AC

V/Q+COM|

750V

DC/AC

Logic

VIQ+COM|

250V

DC/AC

Preparing

for

operation

Installing

the

Battery

Your

meter

require

a

9V

battery

for

power.

The

-

symbol

appears

when

the

battery

voltage

drops

to

certain

limits.

For

correct

operation,

replace

the

battery

as

soon

as

possible.

Contin-

ued

use

with

a

low

battery

will

lead

to

errors

in

readings.

WARNING:

TO

AVOID

ELECTRIC

SHOCK,

DISCONNECT

BOTH

LEADS

FROM

ANY

EQUIPMENT

BEFORE

YOU

REMOVE

OR

INSTALL

THE

BATTERY.

The

battery

can

be

installed

by

the

following

procedure

:

1.

Turn

off

the

power

and

disconnect

the

two

test

leads.

2.

Remove

the

screw

to

open

the

battery

com-

partment.

3.

Place

the

battery

inside

the

insulation

capsule

and

snap

it

into

place.

WARNING:

DO

NOT

DISCARD

THE

INSU-

LATION

SLEEVE.

FAILURE

TO

USE

THIS

SLEEVE

MAY

CAUSE

DAMAGE

TO

THE

METER

AND

POSSIBLE

PERSONAL

IN-

JURY.

4.

Replace

the

battery

compartment

cover

and

screw

down.

WARNING:

DO

NOT

OPERATE

THIS

MET-

ER

UNTIL

THE

BATTERY

COVER

PLATE

HAS

BEEN

REFITTED.

Test

Leads

Use

only

the

leads

supplied

with

your

meter.

These

test

leads

are

rated

for

1200

volts.

Caution

:

Although

the

test

leads

are

rated

for

1200

volts,

the

maximum

input

voltage

to

the

meter

is

1000V

DC

or

750V

AC

RMS,

you

may

damage

‘the

meter

and

expose

yourself

to

a

serious

shock

hazard.

Always

use

extreme

care

when

measur-

ing

high

voltages.

Never

connect

the

COM

terminal

to

any

source

greater

than

500V

with

respect

to

ground.

This

will

creat

a

serious

shock

hazard.

Using

the

meter

1.

Power

ON/OFF

button

Press

the

ON/OFF

button

to

turn

the

meter

ON,

press

the

button

again

to

turn

the

meter

OFF.

Automatic

Power

off

The

automatic

power

off

feature

extends

the

life

of

the

batteries

by

turning

the

meter

off

if

neit-

her

the

rotary

switch

or

the

buttons

have been

operated

for

ten

minutes.

However

if

the

COM

mode

is

on

or

the

temperature

range

is

selected

the

automatic

power

off

feature

is

disabled.

2.

Function

button

The

AH(auto

hold)indicator

will

be

displayed

on

the

LCD

when

the

meter

is

turned

on.

Each

pres-

s

of

the

function

button

will

display

a

function,

when

the

function

as

each

function

is

displayed

you

may

select

or

deselect

the

function

by

press-

ing

the

SET/RESET

button.

The

sequence

that

the

functions

are

displayed

is

as

follows

:

AH~

DH-MIN

—~MAXK->REL~MEM-~>RCL-RH

—COM->DUAL->CMP

4.

DCQ/AC

©

Press

the

DCQ/AC

button

to

toggle

between

AC

and

DC

when

the

rotary

switch

is

set

to

vol-

tage

or

current,

or

between

resistance

and

conti-

nuity

when

the

rotary

switch

is

set

too)

©

5&6.

UP

DOWN

buttons

Press

the

UP

or

DOWN

buttons

to

determine

the

polarity,

value

and

range

of

the

reference

val-

ue

in

the

REL

and

CMP

modes,

these

buttons

are

also

used

to

address

the

stored

reference

val-

ues

in

the

MEM

and

RCL

modes,

and

to

in-

crease/decrease

the

range

value

in

the

RH

mode.

7.

Back

light

Pressing

the

yellow

button

will

turn

on

the

back

light,

this

will

make

readings

much

easier

in

poor

lighting

conditions.

The

light

will

remain

on

for

25

seconds.

8.

Transistor

hFE

Insert

the

bases,

emitter

and

collector

of

the

tran-

sistor

into

the

correct

terminals

as

marked

on

the

socket.

ee

9.

Capacitor

and

temperature

socket.

Insert

a

discharged

capacitor

into

the

outermost

connections

observing

correct

polarity

if

requir-

ed.

Insert

a

K

type

thermocouple

into

the

innermost

connections.

io

:

I

+

Temperature

|

o-

Capacitance

10.

Rotary

function

selector

switch

The

following

functions

can

be

selected

using

the

function

selector

switch,

mV

==

Millivolts

ac/dc.

Ve

Volts

ac/dc

mA

===

Milliamperes

ac/dc

=

Amperes

ac/dc

(©)

Oo

Continuity/Resistance

—_\<q—

Diode

Test

FREQ

Frequency

CAP

Capacitance

hFE

Transistor

TEMP

Temperature

TEMP(ROOM)

Room

Temperature

LOGIC

Logic

test

11.

20A

Amperes

input

terminal

For

Current

measurements

of

up

to

1OA

AC

or

DC.

12.

mA

Milliamp

input

terminal

For

current

measurements

of

up

to

400mA

AC

or

DC.

13.

COM

Common

terminal

Return

terminal

for

all

measurements.

14.

V/X

©)

Volt,

resistance,

continuity,

diode,

frequency,

log-

ic

test

terminal.

15.

Digital

display

Digital

readings

are

displayed

on

a

4000

count

display

with

automatic

polarity

and

decimal

point

placement.

16.

Wninnnncnnnnnnneneiinnimiindx>

Analog

Bar

Graph

The

bar

graph

consists

of

43

segments

that

il-

luminate

from

left

to

right

as

the

input

increases.

It

functions

in

much

the

same

way

as

the

needle

on

an

analogue

meter

but

without

the

mechan-

ical

overshoot

inherent

in

meter

movements.

If

the

input

exceeds

the

measuring

range

selec-

ted,

OL

is

displayed,

the

bar

graph

flashes

and

a

bleeping

noise

is

heard.

17.

Perrin

ernie

te

Bar

Graph

Scale

for

absolute

readings.

18.

OL

Overload

Indication

OL

is

diaplayed

with

the

measurement

exceeds

the

measuring

range

selected.

Tun

init

ili

fast

wii

Tut

uae

MMMM

TT

>

19.

AH

Auto

Hold

The

meter

displays

a

reading

automatically

rec-

orded

2

seconds

previously.

20.

DH

Data

Hold

In

this

mode,

a

reading

can

be

stored

on

the

sub

display

by

pressing

the

SET/RESET

button,

the

main

display

will

display

all

subsequent

readings.

21.

MIN

Minimum

The

sub

display

shows

the

maximum

reading

whilst

the

main

display

shows

present

reading.

22.

MAX

$=/Maximum

The

sub

display

shows

the

maximum

reading

whilst

the

main

display

shows

the

present

read-

ing.

23.

REL

_

Relative

Enables

you

to

compare

a

reference

reading

with

subsequent

readings.

To

set

the

reference

value

proceed

as

follows

:

1.

Set

the

function

mode

to

REL

2.

Store

the

polarity,

values

and

range

of

the

ref-

erence

value

by

pressing

the

UP

DOWN

and

SET/RESET

buttons.

3.

Press

the

SET/RESET

button

for

the

final

set-

ting

and

the

meter

will

return

to

manual

mode.

Example:

Store

Polarity

+

or

—

(with

UP/DOWN)

=>

SET/RESET>

Store

the

first

Value

=>

SET/RESET>

Store

the

second

Value

=>

SET/RESET>

Store

the

third

Value

=>

SET/RESET>

Store

the

fourth

Value

=>

SET/RESET>

Determine

the

range(with

UP/DOWN)

=>

SET/RESET

>

The

display

will

show

REL

&

RH

4.

To

exit

REL

mode,

press

the

function

button

or

turn

the

rotary

switch

to

another

range.

Your

meter

will

display

the

difference

between

the

stored

reference

value

and

subsequent

read-

ings

on

the

sub-display

whilst

the

main

display

will

show

the

actual

reading.

For

examples,

if

the

stored

reference

is

100V

and

the

present

reading

is

90V,

the

sub

display

will

show-10V

and

the

main

display

will

show

90V.

If

the

reading

is

the

same

as

the

stored

values

the

sub

display

will

show

0.

24.MEM

Memory

Up

to

ten

reference

measurements

can

be

stored

in

to

the

memory,

to

set

store

these

values

pro-

ceed

as

follows:

1.

Set

the

function

to

MEM

mode.

2.

Press

UP/DOWN

button

until

the

desired

memory

location

is

displayed

(0

to

9).

3.

Press

SET/RESET

button

to

store

the

reading

into

the

selected

memory

location.

If

you

store

a

reading

into

a

memory

location

which

already

contains

data,

the

old

data

will

be

replaced

with

the

new.

25.

RCL

Memory

Recall

This

mode

enables

the

measurements

loaded

into

memory

to

be

displayed,

to

recall

a

previously

save

reading

proceed

as

follows:

1.

Set

the

function

RCL

mode.

2.

Press

the

UP/DOWN

buttons

to

select

the

des-

ired

memory(0

to

9).

3.

Press

SET/RESET

button.

The

contents

of

the

selected

memory

will

be

dis-

played

on

the

sub

display.

26.

RH

Range

Hold

This

mode

sets

the

meter

from

auto-ranging

to

manual

mode

in

all

ranges

except

frequency

and

capacitance

positions.

In

the

manual

mode

each

press

of

the

up

or

down

key

will

increment

or

decrement

the

range.

To

exit

the

manual

mode,

press

the

SET/RESET

button.

27.

DUAL

Dual

display

This

mode

allows

the

meter

to

show

a

dual

dis-

play

on

the

LCD

in

the

following

ranges:

Frequency

Voltage

|

Logic

|

wLO_|_Frequency

_|

Logic

Notes

:

The

meter

will

display

ripple

frequency

in

the

DC

mode.

In

the

ranges

DC/AC

A,

resistance,

diode

and

hFE,

the

sub

display

may

show

FREQ

0.000.

This

is

not

a

reading

and

the

dual

display

fea-

ture

does

not

operate

in

these

ranges.

28.

COM

Communication

This

mode

allow

interfacing

to

a

personal

com-

puter.

12

se

Se

ee

IY

BS

SS

ES

me

ae

DS

se

ee

ae

29.

CMP

Comparison

This

mode

enables

rapid

high

or

low

testing

by

comparing

the

reading

to

a

stored

high

and

low

reference

values.

On

the

sub

display,

a

LO

indicates

that

the

read-

ing

is

below

the

stored

low

figure

and

a

HI

indic-

ates

that

the

reading

is

above

the

stored

high

fig-

ure,

if

the

reading

is

within

the

stored

band

than

PASS

will

be

displayed.

To

store

the

reference

values

of

MIN/MAX

re-

fer

to

the

steps

of

REL

2,3.

To

exit

CMP

mode,

press

the

function

key

or

turn

the

rotary

switch

to

and

adjacent

range.

30.

Memory

Address

This

character

displays

the

selected

memory

ad-

dress

in

the

RCL

and

MEM

modes

(see

RCL

and

MEM).

31.

—+

Diode

Test

The

value

displayed

is

the

forward

voltage

at

ap-

proximately

ImA.

Single

0

—2.5V

range.

32.

AC

Alternating

current

or

voltage

Indicates

that

an

AC

current

or

voltage

range

has

been

selected.

33.

(©)

Continuity

Check

Indicates

that

the

continuity

range

has

been

sel-

ectd.

This

range

is

very

useful

for

checking

con-

tinuity

of

cables,

fuses

and

connections

etc.

34.

==

Negative

Polarity

Automatically

indicates

negative

inputs.

When

REL

is

enabled,

this

sign

indicates

a

negative

re-

sult

of

the

mathematical

calculation.

35.

FREQ

Frequency

count

mode

In

this

mode

the

meter

displays

the

measured

frequency

up

to

40MHz.

36.

TEMP

Temperature

At

the

TEMP(ROOM)

position

the

meter

dis-

plays

the

room

temperature.

At

the

TEMP

pos-

ition

and

using

an

optional

K

type

thermocouple

temperatures

of

—40°C

to

1200°C

can

be

meas-

ured.

37.

CAP

Capacitance

This

range

allows

capacitance

measurements

in

the

following

ranges

:

4nF,

40nF,

400nF,

4uF

40uF,

400uFP.

_

SS

ee

SS

Saleen

eee

re

eee

38.

hFE

Transistor

hFE

Enables

hFE

measurements.

39.

LOGIC

Logic

Test

Enables

you

to

check

logic

levels

without

extra

logic

probes.

The

display

will

show

HI,

LO

or

=

mma

to

indicate

logic

high,

low

or

indetermin-

able.

40.

Sub

display

Allows

secondary

reading

to

be

displayed

inde-

ae

of

the

main

display.

41.

Low

Battery

arn

meter

is

powered

by

a

single

9V

battery.

At

least

8

hours

of

battery

life

remain

when

this

symbol

if

first

dispalyed,

to

avoid

errorous

read-

ings

replace

the

battery

as

soon

as

possible.

42.

The

annunciators

show

the

unit

of

the

‘value

displayed

:

AC

Alternating

current

or

voltage

DC

Direct

current

or

voltage

mV

_

Millivolts(1

x

10-3)

V_

Volts

KHz

_

Kilohertz(1

X

10°cycles).

Frequency

MHz

Megahertz(1

x

10®cycles).

Frequency

‘Cc

Centigrade

degrees

°F

.

Fahrenheit

deqrees

uF

Microfarads(10°Farads).

nF

Nanofarads(10°Farads).

A

Amper(Amps).

Current

mA

Milliampere(1

x

10~3amps)Current

Q

Ohms.

Resistance

KQ_

Kilohm(1

x

103)

MQ

Megohm(1

x

10°)

Measuring

AC/DC

Voltages

WARNING:

DO

NOT

ATTEMPT

TO

MEAS-

URE

A

VOLTAGE

GREATER

THAN

1000

VOLTS

DC

OR

750

VOLTS

AC.

YOU

MAY

DAMAGE

THE

METER

AND

EX-

POSE

YOURSELF

TO

A

SERIOUS

SHOCK

HAZARD.

To

measure

AC/DC

volts

proceed

as

fol-

lows

:

1.

Rotate

the

rotary

switch

to

the

V

position.

2.

Press

the

DCQ/AC

(©)

button

to

toggle

between

alternating

and

direct

voltage.

3.

Connect

the

meter

in

parallel

with

the

load

or

circuit.

14

seen

eee

ee ee

ee

renee

_=——

Each

of

the

five

AC/DC

voltage

ranges

pres-

ents

an

input

impedance

of

approximately

-10MQ

in

parallel

with

less

than

100pF.

AC

voltage

is

AC

coupled

to

the

1OMQ

input.

Measuring

AC/DC

Current

WARNING:

YOU

MAY

DAMAGE

THE

METER

OR

COULD

SUFFER

PERSONAL

INJURY

IF

THE

FUSE

BLOWS

WHILST

CURRENT

IS

BEING

MEASURED

IN

A

CIRCUIT

WHICH

EXHIBITS

AN

OPEN

CIRCUIT

VOLTAGE

GREATER

THAN

250V.

THE

20A

TERMINAL

IS

FUSED.

A

SEVERE

FIRE

HAZARD

AND

SHORT

CIRCUIT

DANGER

EXISTS

IF

YOU

AP-

PLY

A

VOLTAGE

WITH

HIGH

CURRENT

CAPABILITY

TO

THIS

TERMINAL.

THE

METER

CAN

BE

DESTROYED

UNDER

SUCH

CONDITIONS.

To

make

current

measurements

proceed

as

follows

:

1.

Set

the

rotary

switch

to

the

A

or

mA

pos-

ition

depending

on

the

current

to

be

meas-

ured.

..

Press

the

DCQ/AC

©)

button

to

toggle

between

alternating

and

direct

current.

3.

Connect

the

meter

in

series

to

the

load

or

circuit

under

test.

Note

:

If

you

do

not

know

the

expected

cur-

rent,

use

the

20A

range

first

and

if

the

reading

is

less

than

400mA

then

use

the400mA

range.

When

measuring

Current,

the

meters

internal

shunt

resistors

develop

a

voltage

across

the

meters

terminals

called

a

bur-

den

voltage.

This

voltage

drop

is

very

low

but

could

affect

precision

circuits

or

measurements.

When

in

the

DC

mode

a

‘—’

sign

will

appear

if

the

current

flow

is

negative.

Continuity

To

perform

audible

continuity

tests,

set

the

rotary

switch

to

the

@)Q

position

and

pres-

s

the

DCQ/AC

©)

button

to

toggle

between

resistance

and

continuity,

connect

the

meter

to

SSS

a

ET

TET

the

circuit

under

test.

WARNING:

Never

perform

continuity

meas-

urements

whilst

power

is

connected

to

the

cir-

cuit

Note

:

The

buzzer

will

sound

if

the

circuit

under

test

has

a

resistance

of

less

than

300.

Resistance

WARNING:

NEVER

CONNECT

THE

TEST

PROBES

TO

A

SOURCE

OF

VOLTAGE

WHEN

YOU

HAVE

SELECTED

THE

OHMS

RANGE.

MAKE

SURE

THAT

THE

_

CIRCUIT

UNDER

TEST

HAS ALL

POWER

RE-

MOVED

AND

ANY

ASSOCIATED

CAP-

ACITORS

ARE

FULLY

DISCHARGED.

1.

Set

the

rotary

switch

to

the

@)

Q

pos-

ition.

2.

Press

the

DCQ/AC

©)

button

to

toggle

between

resistance

and

continuity.

3.

Connect

the

probes

to

the

device

you

with

to

measure.

Notes

:

The

resistance

of

the

test

leads

can

diminish

the

accuracy

on

the

lowest

range.

The

error

is

usually

1

to

0.2

ohms

for

a

standard

set

of

test

leads.

To

determine

the

error,

short

the

test

leads

together

and

read

the

resistance

of

the

leads.

When

measuring

resistance,

be

sure

that

the

contact

between

the

probes

and

the

circuit

under

test

is

good.

Dirt,

oil,

solder

flux

or

other

foreign

matter

will

seriously

affect

the

accuracy

of

the

reading.

If

the

measured

resistance

exceeds

the

max-

imum

of

the

range

selected,

OL

will

be

shown

on

the

display

and

the

bar

graph

will

flash.

For

resistanc’s

of

4MQ

or

more,

the

display

may

take

a

few

seconds

to

stabilise.

This

is

normal.

Diode

This

function

allows

checking

of

diodes

and

other

semiconductors

for

open

and

short

cir-

cuits.

You

can

use

also

determine

the

forward

voltage

of

the

diode,

this

feature

is

useful

when

matching

diodes.

15

1.

Set

the

rotary

switch

to

the

-+¢q~position.

2.

insert

the

test

leads

into

the

COM

and

VQ

terminals.

3.

Connect

the

probes

to

the

device

under

test.

Notes

:

If

the

display

indicates

overrange,

reverse

the

polarity

of

the

connection.

If

the

display

shows

a

value,

the

device

is

good,

The

value

is

the

devices

forward

volt-

age(up

to

2.5

volts).

If

the

display

still

shows

an

overrange,

the

de-

vice

is

open

circuit.

If

the

display

shows

in

both

directions,

the

device

is

short

circuit.

Frequency

WARNING:

IF

YOU

ATTEMPT

TO

MEAS-

URE

THE

FREQUENCY

OF

A

SIGNAL

OF

MORE

THAN

750

VOLTS

RMS,

YOU

MAY

DAMAGE

THE

METER

AND

EX-

POSE

YOURSELF

TO

A

SERIOUS

SHOCK

HAZARD.

1.

Set

the

function

selector

switch

to

the

FREQ

position.

2.

Insert

the

test

probe

into

the

COM

and

VQ.

terminals.

3.

Connect

the

probes

to

the

signal

source.

Notes

:

When

the

test

probes

are

connected

to

an

AC

outlet,

do

not

turn

the

selector

switch

to

anot-

her

range,

as

this

may

damage

the

meter

and

cause

injury

to

the

user.

Overload

protection:

750V

RMS.

Input

sensitivity:

100mV

up

to

30MHz.

300mV

over

30MHz.

Capacitance

1.

Discharge

the

capacitor

under

test

before

connecting

it

to

the

meter.

Be

very

careful

when

handling

hign

voltage

capacitors

as

these

may

be

charged.

CAUTION

:IF

YOU

ATTEMPT

TO

MEAS-

URE

A

CHARGED

CAPACITOR,

DAM-

AGE

TO

THE

METER

MAY

RESULT.

2.

Set

the

rotary

switch

to

the

CAP

range.

3.

Insert

the

discharged

capacitor

into

the

CAP

connector

observing

correct

polarity

if

required.

4.

Read

the

display.

Transistors

Warning

:The

transistor

socket

is

not

protected

against

overload,

do

not

connect

this

socket

to

any

voltage

source.

1.

Set

the

rotary

switch

to

the

hFE

position.

2.

Insert

the

transistor

under

test

into

the

test

socket

observing

correct

polarity

and

lead

out

configuration.

3.

Read

the

display.

Notes:

Some

Darlington

transistors

contain

internal

resistors,

because

the

meter

contains

two

cur-

rent

readings

to

calculate

the

hFE,

any

inter-

nal

resistors

will

cause

unreliable

readings.

Do

not

take

the

hFE

reading

as

an

absolute

measurement,

this

range

is

only

intended

to

give

an

indication

that

the

device

is

operating.

The

true

gain

of

a

transistor

is

dependant

on

its

operating

current,

this

meter

only

applies

upto

ImA

to

the

emitter

and

collector

and

measures

the

collector

current

to

calculate

the

hFE.

You

cannot

measure

the

hFE

whilst

the

de-

vice

is

still

in

circuit.

You

cannot

measure

the

hFE

of

an

FET

or

other

non-bipolar

transistor.

The

high

power

junctions

in

power

transistors

prevent

correct

readings

and

the

physical

size

of

the

leadouts

may

cause

damage

to

the

soc-

Ket.

Do

not

attempt

to

determine

the

type,

pinout

or

hFE

of

power

transistors

with

this

meter.

hFE

is

affected

by

temperature,

tyr

not

to

warm

the

transistor

with

your

hands

when

in-

stalling

the

device.

if

the

hFE

reading

is

not

stable

when

you

first

install

the

device,

let

the

devices

temperature

stabilise.

Temperature

The

meter

can

display

the

temperature

in

both

Celsius

and

Fahrenheit,

whilst

in

the

DUAL

mode

Celsius

will

appear

on

the

main

display

and

Fahrenheit

will

appear

on

the

sub

display.

When

the

meter

is

not

in

DUAL

mode

only

18

Celsius

will

be

displayed

on

the

main

display.

The

meter

can

display

the

current

room

tem-

perature

by

setting

the

rotary

switch

to

TEMP(ROOM).

Temperature

from

—407

to

12007

can

be

-

measured

by

using

an

optional

K

type

ther-

mocouple

and

setting

the

rotary

switch

to

the

TEMP

position.

During

the

TEMP

mode

the

auto

power

off

function

will

not

operate.

Logic

The

logic

function

allows

checking

of

digital

circuits

without

the

need

of

a

logic

probe.

Rat-

her

than

display

an

absolute

voltage

the

meter

display

HI,

LO

or

mmmm

to

indicate

logic

high,

low

or

undetermined

respectively.

1.

Set

the

rotary

switch

to

the

LOGIC

pos-

ition.

2.

Connect

the

test

leads

to

the

COM

and

VQ,

terminals.

3.

Connect

the

black

probe

to

a

ground

point

of

the

circuit

under

test

and

the

red

probe

to

the

+voltage

supply.

While

keeping

the

probes

in

place,

press

the

SET/RESET

but-

ton.

4.

While

keeping

the

black

probe

on

the

ground

position,

move

the

red

probe

to

the

points

you

wish

to

test,

the

meter

will

show

one

of

the

following

readings:

HI

The

voltage

exceeds

70%

of

the

stored

voltage.

LO

The

voltage

is

below

30%

of

the

stored

voltage.

PLT}

The

voltage

is

between

30%

and

70%

of

the

stored

voltage.

Notes

:

In

this

mode

MIN,

MAX

and

DH

will

not

operate.

The

supply

voltage

of

the

circuit

must

fall

be-

tween

3V

and

39.99V.

AFTER

PERFORMING

LOGIC

TESTS

RE-

MEMBER

TO

PRESS

THE

SET/RESET

BUTTON

BEFORE

SWITCHING

TO

ANOTHER

RANGE.

Interfacing

the

meter

with

a

PC

1.

Connect

the

supplied

RS-232C

cable

be-

tween

the

meter

and

the

computers

serial

port.

2.

Turn

the

meter

on.

The

supplied

software

will

only

run

on

a

PC.

The

supplied

software

should

be

copied

to

the

computers

hard

disk

or

a

disk

copy

should

be

made.

To

start

the

software

type

METEX

and

press

the

RETURN

key

on

the

computer.

If

at

any

time

the

software

gives

an

1/O

error

press

CTRL+BREAK

simultaneously.

°

Notes

:

You

must

run

the

meter

in

the

function

modes.

Do

not

activate

the

COM

function,

To

release

the

COM

function,

turn

the

rotary

switch

or

press

SET/RESET.

To

activate

transmission

of

data

the

host

computer

must

issue

a

OD(HEX)

command.

Data

format

The

data

consists

of

a

frame

of

14

bytes,

these

are

sent

as

follows:

Connection

of

the

MT/RS-232C

cable

to

the

meter.

|

FRONT

FACE

Z

—

0

OF

Z

=

METER

2

19

20

E>

~~z7z—————_—_—_—_—_[[_[___SSSS_

The

following

is

an

example

of

a_

basic

program

that

gets

a

single

reading

from

the

meter.

10

OPEN

“COM1

:1200,N,7,2,RS,CS,DS,CD”

AS#2

20

A$=D

30

PRINT

#2,A$

40

IN$S=INPUTS$(14,4S)

50

PRINT

IN$

60

CLOSE

#2

70

END

Communication

parameters

Transmission

rate:

1200

baud

Character

coding:

7

bit

ASCI

Parity

:

None

Stop

bits:

2

Care

and

maintenance

Your

digital

multimeter

is

a

precise

electronic

device.

Do

not

tamper

with

the

circuit.

To

prevent

an

electric

shock

hazard,

turn

off

meter

and

disconnect

the

test

leads

before

removing

the

back

cover.

Fuse

replacement

WARNING:

TO

AVOID

AN

_

ELECTRIC

SHOCK,

DISCONNECT

THE

TEST

PROBES

BEFORE

REMOVING

THE

BAT-

TERY

OR

THE

FUSE.

REPLACE

ONLY

WITH

THE

SAME

TYPE.

DO

NOT

RE-

MOVE

THE

TOP

COVER,

SERVICE

SHOULD

ONLY

BE

CARRIED

OUT

BY

QUALIFIED

PERSONNEL.

CAUTION:

FOR)

CONTINUED

PROTEC-

TION

AGAINST

FIRE

OR

OTHER

HAZ-

ARD,

REPLACE

THE

FUSE

WITH

ONE

THAT

HAS

THE

SAME

VOLTAGE

AND

CURRENT

SPECIFICATIONS.

1.

Turn

the

meter

off

and

disconnect

the

test

leads.

2.

Remove

the

rear

cover

by

removing

the

four

screws.

3.

Install

the

new

fuse

in

to

the

fuse

carrier.

4.

Replace

the

rear

cover.

WARNING:DO

NOT

OPERATE

_

THIS

METER

UNTIL

THE

REAR

COVER

IS

IN

PLACE

AND

THE

SCREWS

HAVE

BEEN

REFITTED.

metex TESTLAB Y122HU User manual

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