UNI-T UT33B, UT33C, UT33D Operating Manual

UT33 B/C/D OPERATING MANUAL

UNI-T

UT33B/C/D

Operating

Manual

Palm

Size

Digital

Mult

imeter

SafetyInformation

ThisMetercomplies

with

thestandards IEC61010:in pollution
degree2, overvoltage
catego

ry(CAT

1600

V,CAT II300V)and

double

insulatio

n,

CAT.

I: S

ignal

level,special

equipme

ntorpartsofequi

pmen

t,

tele

communication

,electronic, etc., with smaller transient

overvoltages

than

overvoltages

CAT.

II.

CAT

. II:

Loca

l level,

appliance, POR

TABLE

EOU

EHT

ele.,

with

sma

ller

transient

overvoltages

than

CAT.

IU

Usethe Meter only as specified in this opera'
otherwise the protection provided by the e

Sf

impaired.
Inthis

manual

, aWamingidentifies con

ditions

and

aclioos

pose

hazards

to the user, or may damage the er or

equ

ipment under

test.A

Note identifies

thei

nfonnation

Ihal user

s

houl

d pay

attent

ionon.

I

ntemat

ional

electrica

l symbols

used

onthe Meter andinthis

Ope

rating

Manualare

explai

nedon

pege

10.

RulesFor Safe

Operation

.<!>

Waming

Toavoidpossibleelectric shock or

persona

• to

avoid possible

damage

to the Meter or to the equipme

undertest,

adhere

tothefollowingrules:

• Before usingtheMeter inspectthecase. Donot usethe
Meterif it is

damaged

or the case (or part of the case)is

re

moved

. Lookforcracksor missing plastic.Payattention

totheinsulation

around

theconnectors.

• Inspect the test leads for damaged insulation or
exposed metal. Check the test leads for continuity.
Rep

lace

damaged

testleadswithidentical model number

or electrical specificationsbeforeusing

the Meter.

• Donotapplymorethanthe ratedvoltage. as

marlted

on

the Meter,

between

the terminals or

between

any terminal

andgrounding,

• Therotaryswitchshouldbeplacedin therightposition
and no any changeover of range shall be made during
measurement is conducted to prevent damage of the
Meter

.

• WhentheMeterworltingataneffectivevoltageover 60V
in DCor

42VrmsinAC, special careshould be takenfor

thereis dangerof electricshock.

• Usethe properterminals, function, andrangefor your
measurements

.

• Do not use or store the Meter in an environment of
high

temperature

, humidity, explosive, inflammable and

strong magnetic field.The

performance

of the Metermay

deteriorateafter

dampened

.

•

When

usingthetest

leads,

keepyourfingersbehindthe

fingerguards.

• Disconnect

circuit poweranddischargeallhigh-voltage

capacitors before testing resistance, continuity, diodes
andcurrent.

• Before

measuring

current,checkthe Meter's fuses and

tumoff powerto thecircuitbefore

connecting

theMeterto

the circuit.

• Replace the battery as soon as the battery indicator
appears.Withalowbattery,the

Meter

mightproduce false
readings that can lead to electric shock and personal
injury.

•

Remove

test leads and temperature probe from the
Meter and turn the Meter power off before opening the
Metercase,

•

When

servicing the Meter, use only the samemodel
numberor identical electricalspecificationsreplacement
parts,

• Theinternal circuit of the Metershall not beattered at
willtoavoid

damage

oftheMeterandanyacelde

• Soft cloth and mild

detergen

t should be used to

de

the surface of the

Meter

when servicing. No abrasM! and

solventshould beusedto preventthesurfaceof

the Meter

fromcorrosion,

damage

andaccident.

• The eter

is suitablefor indoor use.

• Tum the Meteroff when it is not in use and take out the battery
whennot using for a long time.

•

Constantly

check the

battery

asitmayleakwhenit has

been

using

for sometime, replacethe batteryas soon as leaking

appears

. A

leaking battery will

damage

the Meter.

~

-

ACorOC

~

Low

Battery

ACCurrent

-+I-

Diode

ocCurrent

-

Fuse

•

Ear.h

Ground

>'1)

Continuity

Tes

t

a

llotilIe

Insulat

ed l!>

Safety

Ruless

cs

Con/orms

to

Standards

of Eu

NV

an Union

The

eter Structure(figure 1)

1)

2)

6

3)

DisDIav

Bad<IIchI

Button

4}

5)

6)

7)

F

igure

1

ss

once

enter m e.

• Press HOLD

agom

toexit hold

mode.

• In H<*lmode,l:Iis

displayde

anthe

present

value

shown .

•

Press

BLUE buttononceto tumthed

isplay backlight

on.

• Press

BLUE

button

again

totumthe

display

backlight

off.

• D

isplay backlight

willNOT be

automat

ically

offunless

pressing

the

BLUE button

.

indicated for information about the functional button

IBLUE

button

Me

asurement

Operation

A.DC

VoItage

asurement(seefigure2)

Figu

re2

.<!>

Warnin

g

To avoidharms to youor

damages

to the

Meter

fromelectricshock,

pleasedonot

attempttomeasurevoltages

higherthan

500V

although

readings may beobtained.

The

DC

Voltage

ranges are:

200mV, 2000m

V, 20V,200V and

soe

v To

measml

OC •

conn

ecttheMeter asfo

llows

:

1.

Insert

the red testleadinto

theVQmAterm

inal

and

the

black

test

lead

intothe

COM

.

2. Settherotaryswtchkl an

appropri

ate

measurement

position

inV::=

r

ange

.

3.

Connect

theIeslleads

across

the objectbeing measured.

The

measured

:.ows

on

displa

y.

beobtained.

ValIagl'

lIl!aSlJrement

(see figure 2)

..,oId

hanm to you or damages to the

Meter

from electricshock,

The

AC

valage are:

200V

and

SOOV

. To

meas

ure

AC~

'

connect

the eteras

foIows

:

1.

lnsert

theredtestleadintothe VQmAterminal

and

theblacktest

lead

intotheCOMterm

inal.

2. Setthe

rota

ryswitch toanappropriate

measurem

entpositioninV-

r

ange

.

3.Connectthetestleadsacross

with

theobjectbeing

meas

ured

.

The

measured

value

showsonthedisplay,whichiseffective valueofsine

wave (mean value

response

).

Note

• If the

value

of voltageto be

measured

is

unknown

, usethe

max

imum

measurement

position (500V)and

reduce

the

range

stepbystep

until

asat

isfactory

reading isobtained

.

• The

LCD

displays

"1"indicating the

existing selected

range is

ove

rload

,itis

required toselect

ahigherrangeinordertoobtaina

correct

reading

.

• In each

range,

the

Meter

has an input

impedance

of approx.

10MQ.Thisloadingeffectcan cause

measurement

errors

inhigh

impedancecircuits.Ifthecircuit

impedance

isless

than orequal

to

1

OkQ

, theerrorisnegligible (0.1%or

less)

.

• When AC vollage measurement has been completed,
disconnect

the

connection

between

thetestingleadsandthe

circuit

under

tesl.

C.DCCurrent

Measurement

(seefigure3)

F

igure

3

.<!>

Warning

Neverattemptan in-circuit current

measurement

wherethe

voltagebetweenterminalsandgroundis greaterthan

60V.

If the fuse burns out during

measurement

,the Meter may be

damaged

or the operator himself may be hurt. Use proper

terminals

,function,andrangefor the

measu

rement.Whenthe
testing leadsareconnectedto thecurrentterminals, do not
parallel themacross anycircuit.
TheModel

UT33

B:the

curre

nt

measureme

nthas3

measurement

positions

onthe

rotary

switch:

200!

,A,2

00mAa

ndl

OA.

The Model

UT33C

IUT33D: the current mea

surement

has 4

measurementpositionson the rotary

switch:

2000,uA, 20mA

,

200mAand10A
To

measure

current, dothefollo

wing

:

1. Turn off powerto the circuit. Discharge all high-voltage

capaci

tors.

2.Insert thered lestleadintotheVQmAor lOA

terminal

andthe

black

testleadintotheCOMte

rmin

al.

3.-set

the

rotary

swi

tchtoan

appropriatemeasurement

posi

tionin

A

:=

range

.

4.

Brea

currentpathtobetested.

Conne

ctthe

red

test

lead

to

the

more

p<lSlIjW

side of the

break

andthe

black

testlead to the

more

negative

SIde

of break.

5.

Tum onpower

tothe cirtuil.

The

mea

sured

valueshows

onthe di

splay

.

Note

• If thevalue of current10 be

meas

uredis unk

nown,

usethe

maximumm

easurement

posit

ion(10A)

• andreducetherange stepby

step

until a

satis

factory

reading

is

obtained.

•

When

current

measurement

hasbeencompleted.d

isconnect

the

conneclionbetween

thete

sting

leads

• andthecircuit

unde

rtest.

D.

Measuring

Resistance

(seefigure4)

F

igure

4

.<!>

Warning

To avoid

damages

to the Meterorto the

devices

undertest,
disconnectcircuit power and dischargeall the high-voltage
capacitors

before

measuring

resistance.

­The Model UT33B/UT33C: The resistance measurement
positions

are: 200Q,2000Q

,20kQ,

200kQ

and

20MQ

.

TheModel

UT33D

: Theresi

stance

meas

ureme

nt positionsare:

200Q,

2000Q

,20kQ,

200kQ

,20MQ

and

200MQ

To

measu

reresistance,

conne

ctthe

Meter

asfo

llows

:

1. I

nsert

the redtest lead intotheVQmA

terminal

and

theblack

testleadintotheC

OM

terminal

.

2.Setthe

rotary

switch

toanapp

ropriate

mea

surem

entpositionin

Q

range

.

3.

Connect

thetestleads

acro

sswiththeobjectbeingm

easured

.

The

measu

red

value

shows

onthe

display

.

Note

• The

testleadscanadd0.1Q to 0.3Q of errorto

resistance

eas

rement.

Toobtainprecision readings in low-resistance

measur

ement.

that is therange of 200Q.s

hort-ci

rcuit the input

term

inals

beforeh

andandr

ecord

the

reading

obtained(called

this

rea

dinaas

Xl.

(Xl

Istheadditional

resistance

from

thetest

lead

.

P/N:11040110248 0

UT33 S/

elD

OPERATING MANUAL

UNI-T

Then

usethe

equation

:

measured

resis

tance

value(Y)-(X) = precision re

adings

01

resistance

.

o For

high-resis

tance

measurement

(>1

MQ), it is nonnal

taking

several

secon

dsto

obtain astable

reading

.

o When resistance

measurement

has been completed,

discon

nectthe

connection

between

the

testing

leads and the

circuit

under

test.

E. DiodesandContinuity

Measur

ement(seefigure5)

Testing

Diodes

&>

Warning

To avoid

amages

to the Meter or to the devices under

test, disconnectcircuit powerand

discharge

all the high-

voltage

capacitors

beforediodes.

Usethediode test to check diodes,transistors, and other
semiconductor

devices.

The diodetest sends a current

through

thesem

iconductor

junction,andthenmeasuresthe

voltage

drop

across

the

junction.

A good silicon

junction drops

between

0.5V

and

0.8V.

Totesta

diode

0U1

ofaci

rcun,

connect

the Meteras

IoIows:

I. Insert the red testleadinto theVQmA t

erminal

and the

blacktest

lead

intothe

COM

terminal.

2. Setthe

rotary

switch

to

"*

(The

Mode

l:

UT33B

)Of

"*

,")

(The

Model:

UT33C

/UT33D

)

3. For

forward

voltage

drop rea

dings

on any

semi

conductor

component, place

theredtest

lead

onthe

component's

anode

and

place

the

black

test leadonthe

componen

t's

cathode

.

The

measured

value shows

onthe

display

.

Note

o In a circuit, a

good

diode

should

still p

roduce

a forward

voltage

drop reading of 0.5Vto 0.8V; however. r

else

voltage

drop

reading canvary

depe

ndingonthe

resislance

01

other

pathways betwee

n the probe tips.

o

Connect

thetestleadstothe

proper

tenrOnals

as said

above

toavoid

error display

.The

LCD

wi!

display

T

indicating

ooen-

circuit for wrong connection. The unit of diode is Volt IV),
displaying

the

positive

-connection

voltage-dropvalue.

o

When

diode

testing has

been

completed, disconnect

the

connection

between

thetesting

leads

andthecircuit

under

test

TheModel

UT33C

/UT33D

:Testingfor Continuity

Totestfor

continuny,connect

the

Mete

ras

below:

I. Inserttheredtest lead into theVQmA

tennina

l and the

black

teslleadintothe

COM

term

inal.

2.Set

the

rotaryswnch

to

"*

",)

.

3. Connect the test leads across with the object be'
measured.
The

buzzer

sounds

if the re

sistance

01

a

arwt

under Iesl .

less

than

70Q.

Note

o TheLCD displays "I" indi

cating

the

circuit

being

Iesled is

open

.

o

When

continui

tytesting hasbeen completed,lisalnned

connection

between

thetesting

leads

andthe

circuit

F.

ModelUT33C:Tempe

rature

easureme

(see gure 61

&>

Warn

ing

Toavoid harmsto you or

damages

to the Meter, se do

not attemptto input

voltages

higher than60Vin DCor

inAC,

The

Temperature

measuremen

t range is -40'C-

OOO

'Cor

40"F-

1832"F.To

measure

tempera

ture, c:onnecI as

follows:

1. Insert the redtemperature probeInIo the V

and

the

black

temperatu

reprobe inlo CO e

2.Setthe

rotary

swnch

to'C

Of"

.

3.

Place

the

temperature

probe

to the

oilled

beingmeasured

Themea

sured

value

shows

onthe

display

.

Note
o TheMeteraut

omatically

display

s the

temper

alure value
inside the Meter when there is no temperature probe
connec

tion.

o The included point contact temperature probe

can

onlybe

used

up to 250'C(482"F).For any

measureme

nt higher than

that.

therod

tvoe

temoerature

probe

mustbe

used

instead

.

•

When

temperaturemeasurement

hasbeencomp

leted, discon

nectthe

connection

between

thetestingl

eads

andthe

circuit

under test.

G. TheModel

UT33

B: BatteryTest (seefigure7)

Figure7

&>

To avoid nns toyouor

damages

tothe

Meter,please

donotattempt

to

1n1l'1ll., obges higherthan 60Vin DCor 30Vin AC.

To

proceedas

follows:

1.

rolaIy

VQrnA

terminal

and

theblacktest

leads

into

the

COM

appropria emeasurement

posi

tionin....

2. Set
range.

3.

Connect

Ill!

Ieslleads

across

the batterybeing

measu

red

ensuring

the

poIarBy

' rorrect

The

valle

shows

onthe

display,

w!lich

is the

voltage between

the

ca#Jode

and

anode

01the battery.

Nola

_PlY

....

m hasbeen

completed, disconnect

the

connection

be_en

'

:Ie

.!SlirlQ

leads andthe

circuit

under

test

terminals (red

Note

o The
o The

SClJllE!

3Vpp

wtlen it is loaded I MQ.

• 'MIen

square

wave

oo1put

tesllng

hasbeen

complet

ed, d

isconnect

the

comection

betweenIhe te

sllng

leadsandIhe

circuit

under test.

General Specifications

- . MaximumVoltage (includingtransient overvoltage) between any

3ls and

G.'Omding

'

SOO

Vrrns.

::>

Acroracy

Specification

Act:AJI'ac;.

(all.

reading

• b

guarantee

forI

year.

Operalllg Iemperaue; 23'C ± 5'C.

R

'.

<75

"-

" • cae ed

accu

racy)

f l ·C.

Ovenoad

Protection

2SOV

DCorAC

500V

DCorAC

ovencac

Prot

ection

SOOVDC

orAC

C. DC

Current

Range

Resolution

Accuracy

Overeat

Pro

tection

UT33B

UT33C I UT33D

200IlA

O.ll

l A

±(1%+2)

........

315mA,

250V

fast

type

fuse

:

5x20mm

2000IlA

IlIA

........

± (1%+2)

20mA

10pA

200mA 100pA

±(1.2%+2)

lOA 10mA

,!;(2%+51

Un-

Fused

Remark

:

I.At lOA

Range

: For

conti

nuousmeasu

rement

s 10

seconds

and

interva

l notlessthan 15

minut

es.

D.

Resistance

Range

Resolution

Accu

racy

Overeat

Protection

UT33BluT33CI UT33D

200Q 0.1Q

+ (0.8%+5)

250V

DC

orAC

2000Q

1Q

± (0.8%+2)

-1:(1

%+5)

20KQ 10Q

200KQ 100Q

20MQ 10KQ

200MQ

100

KQ

±[5%(reading·10}+10) UT33D

E.

Diodes

andContinuity

Measurement

(Continuity

test only

for

UT33C/UT33D)

Range Resolution Remark Overloaf

Protection

Display

*

I mV approximate

forward voltage 250V DC
drop:0.5v - 0.8v or AC

·OI

l

IQ

Buzzer beeps

at<70W

F.The Model

UT33C:

Temperature

Range Resolution Remark

Overloaf

Protection

-40 'C - 150'C + (1%+3)
250V DC

or AC

l

50 'C ~100 0 '

C

1'C

± (1.5%+15)

-'

IO"F -:102''!'

± (1%+4)

302"F

-

1832"F

1"F

± (1.5%+15)

G. The

Mode

UT33B

:Battery Test

I

Range Resolution

Internal Resistance

2V 10mV

240Q

9V IDmV 1.8KQ

I

1.5V 10mV 30Q

H. The

Mode

UT33D:Square

Wave

Output

Ranoe Illustration

Appr

ox.

outp

ut 50H z sq ua re

wave

...IJr-

OUT

signel.As a simple signal source with
47KQ resistance output.

Rema

rk:
I .Nooverloadprotection.
2

.Make

sure voltage

outpul

ofcalibratedequipment

level

is less

than

10Vtoavoid

damages

tothe

mete

r,

Maintenance

Replac

ing theBatteryandReplacingthe Fuses

&>

Warin

ing(Replac

ing the Battery)

Toavoidfalse

readings

,whichcould leadto possibleelectric

shockor personalInjury,

replace

thebatteryas soonas the

batteryindicator

" D "appears.

&>

Warining(Replac

ingthe

Fuses

)

Toavoid electricalshockor arc blast,or

personal

Injury or

damage

to the

Meter,

usespecifiedfuses

ONLY

inaccordance

withthefollowing

procedure.

To

replace

the

battery

and

fuses

:

I.

Oisconnectthe

connection

between

the

lesting

leads

andthe

cirCIJit

under test.and

remove

the

testing

leads

away

from

the

inputt

erminal

sof the

Meter

.

2 Tum

the Meierto

OFF

posit

ion.

3. Remove

the

screw

from

case

bottom

,and

separate

thecase

bottom

from

the

case

top.

4.

Rem

ovethebattery

from

the

battery

compartment.

5.

Remove

lhefusebyg

ently

prying

oneendloose, andthentake

oul the

fusefrom

its

bracket.

6.

Rep

lacethe

battery

withanew9V

battery

(NEDA

1604or

6F22

orOO6P)

.

7. Install

ONL

Yrep

lacement

fuses

Wit

h the identical typeand

specification asfollows

andmake

sure

thefuseis

fixed

firmly

in

thebra

cket.

315

mA,

250V,

fasl

type

,l' 5.20mm

8.

RejOin

the

case

bottom

and

case

top,

and

reinstall

thescrew.

••• END •••

This opeatingmanualis subjectto change withoutnolice

UN~TRENCGRCUPUMrrEC

Rm 901, 9/F, Nanyang Plaza, 57 Hung To Road,
Kwun Tong, Kowloon, Hong Kong
Tel:

(852) 2950 9168 Fax : [phone]

Email:

info@uni·trend.com

hltp:llwww.unl-lrend.com

Made: Uni-Trend Tecnnology (

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limite

d

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Development Oistriet,Hu Men Town,Dong Guan City.
Guang Dong Province ,China