Unit UT33B User manual

UT33 B/C/D OPERATING MANUAL UNI-T
UT33B/C/D
Operating Manual
Palm Size Digital Mult imeter
SafetyInformation
ThisMeter complies with thestandards IEC61010:inpollution
degree2,overvoltage
catego ry(CAT 1600 V,CATII300V)and double insulatio n,
CAT. I: S ignal level , special equipme ntor parts of equi 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'
otherwisethe protection provided by the eSf
impaired.
Inthis
manual , aWaming identifiescon ditions and aclioos
pose hazards to theuser, or may damage the eror
equ ipmen t under test.A Note id entifies thei nfonnation Ihal user
s houl dpay attent ionon.
I
ntemat ional electrica l symbols used onthe Meterandinthis
Ope
rating Manualare explai nedon pege 10.
RulesForSafe Operation
.<!> Waming
Toavoidpossibleelectric shockor
persona • to
avoid possible damage to the Meter or to the equipme
undertest,
adhere tothefollowingrules:
• BeforeusingtheMeterinspectthecase. Donot usethe
Meter if it is
damaged or the case(or part of thecase)is
re
moved . Lookfor cracksor 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 testleadswith identical model number
or electrical specifications beforeusing the Meter.
• Donotapplymorethantheratedvoltage. as
marlted on
the Meter,
between theterminals or between anyterminal
andgrounding,
• Therotaryswitch should beplacedin theright position
and no any changeover of range shall be made during
measurement is conducted to prevent damageof the
Meter .
• WhentheMeterworltingataneffectivevoltageover60V
in DCor 42Vrms in AC, special care should be takenfor
thereis dangerof electricshock.
• Usethe properterminals, function, andrangefor your
measurements .
• Do not use or store the Meterin an environment of
high
temperature , humidity, explosive, inflammable and
strong magnetic field.The
performance of the Metermay
deteriorateafter
dampened .
•
When using thetest leads, keepyourfingersbehind the
fingerguards.
• Disconnect circuit poweranddischargeall high-voltage
capacitors before testing resistance, continuity, diodes
andcurrent.
• Before
measuring current, checkthe Meter's fuses and
tum off powerto thecircuit before
connecting theMeterto
thecircuit.
• Replace the battery as soon as the battery indicator
appears.Witha low battery, the
Meter mightproducefalse
readings that can lead to electric shock and personal
injury.
•
Remove test leads and temperatureprobe from the
Meterand turn the Meterpower 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
willto avoid
damage of theMeterandany acelde
• Softcloth and mild
detergen t should be usedto de
the surface of the Meter whenservicing. NoabrasM! and
solventshould beusedto preventthe surfaceof the Meter
fromcorrosion,
damage andaccident.
• The eteris suitablefor indoor use.
• Tum the Meteroff whenit is not in useand take out the battery
whennot using fora long time.
•
Constantly check the battery asit mayleakwhenit has been using
for sometime, replacethe batteryas soon as leaking
appears . A
leakingbatterywill
damage theMeter.
~
-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 ofEu
NV
anUnion
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.
• PressHOLD agom toexit hold mode.
• In H<*lmode,l:Iis displayde anthe present value
shown.
• Press BLUEbuttononcetotumthed ispla y backlight
on.
• Press
BLUE button again totumthe display backlight
off.
• D
ispla y backlight willNOTbe automat ically offunless
pressing the BLUE b utton .
indicated for information about the functional button
IBLUE button
Me asurement Operation
A.DC VoItage asurement(seefigure2)
Figu re2
.<!> Warnin g
To avoid harms to you or
damages to the Meter fromelectricshock,
pleasedo not
attempt to measu re voltages higherthan 500V although
readingsmaybeobtained.
TheDC
Voltage ranges are: 200mV , 2000m V, 20V,200V and soe v To
measmlOC •
conn ecttheMeterasfo llows :
1.
Insert theredtestleadinto theVQmAterm inal and the black test lead
intothe COM .
2.Settherotaryswtchkl an appropri ate mea s urement position inV::=
r
ange .
3. Connect theIeslleads across the objectbeingmeasured.
The measured :.ows on displa y.
beobtained.
ValIagl' lIl!aSlJrement (see figure2)
..,oId hanm to you ordamages to the
Meter fromelectricshock,
The AC valage are: 200V and SOOV . To meas ure
AC~ '
connect the eteras foIows :
1. lnsert theredtestleadintotheVQmAterminal and theblacktest lead
intotheCOMterm inal.
2.Setthe rota ryswitchtoanappropriate measurem entpositioninV-
r
ange .
3.Connectthetestleadsacross
with theobjectbeing meas ured .
The
measured value showsonthedisplay,whichiseffectivevalueofsine
wave(meanvalue
response ).
Note
• If the
value of voltage to be measured is unknown , usethe
max
imum measurement position (500V)and reduce the range
stepbystep until asat isfactory reading is obtained .
• The
LCD displays "1"indicating the existing s elected range is
ove
rload ,itis required to select ahigherrangeinorder toobtaina
correct
reading .
• Ineach
range, the Meter has an input impedance ofapprox.
10MQ.Thisloadingeffectcancause
measurement errors inhigh
impedancecircuits.Ifthecircuit
impedance isless than or equal to
1
OkQ ,theerrorisnegligible(0.1%or less) .
• WhenAC 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
voltagebetweenterminalsandground is greaterthan
60V.
If the fuse burnsout during measurement ,the Meter maybe
damaged or the operator himself may be hurt. Use proper
terminals ,function,andrangefor the measu rement.Whenthe
testing leadsareconnectedto the currentterminals, do not
parallel themacrossanycircuit.
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 therotary switch: 2000,uA , 20mA ,
200mAand10A
To
measure current,dothefollo wing :
1. Turnoff powerto the circuit. Discharge all high-voltage
capaci tors.
2. Insert thered lestlead into theVQmAor lOA terminal andthe
black testleadintotheCOMte rmin al.
3.-set
the rotary swi tchtoan appropria te measurement posi tionin
A
:= range .
4. Brea currentpathtobetested. Conne ctthe red test lead to
the
more p<lSlIjW side ofthe break andthe black testleadto the
more negative SIde of break.
5. Tum on power tothe cirtuil.
The mea sured valu e shows onthe di splay .
Note
• If the value of current10 be
meas uredis unk nown, usethe
maximumm
easurement posit ion(10A)
• andreducetherangestepby
step untila satis factory reading is
obtained.
•
When current measurement hasbeen completed.d isconnect
the conneclionbetween thete sting leads
• andthecircuit
unde rtest.
D. Measuring Resistance (seefigure4)
F
igure 4
.<!> Warning
To avoid
damages to the Meteror to 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 red test 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
• Thetest leadscanadd0.1Q to 0.3Q of errorto
resistance
eas rement. Toobtainprecision readings in low-resistance
measur ement. that is the range of 200Q.s hort-ci rcuit theinput
term inals beforeh andandr ecord the reading obtain ed (called this
rea dinaas Xl. (Xl Istheadditional resistance from thetest lead .

P/N:110401102480 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 a stable reading .
o Whenresistance
measurement has been completed,
discon nectthe connection between the testing leads and the
circuit under test.
E.DiodesandContinuity Measur ement(seefigure5)
Testing Diodes
&> Warning
Toavoid amages to the Meteror to the devices under
test, disconnectcircuit powerand
discharge all the high-
voltage capacitors beforediodes.
Usethe diode testto checkdiodes,transistors, and other
semiconductor devices. The diode test sendsa current
through thesem iconductor junction, andthenmeasures the
voltage drop across the junction. Agoodsilicon junction d rops
between 0.5V and 0.8V.
Totesta
diode 0U1 ofaci rcun, connect the Meteras IoIows:
I. Insert theredtestleadinto the VQmA 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 onany semi conductor
component , place theredtest lead onthe component's anode
and
place the black testleadonthe componen t's cathode .
The measured value s hows 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 pathway s betwee ntheprobetips.
o Connect thetestleadstothe proper tenrOnals as said above
toavoid error d isplay .The LCD wi! display T indicating ooen-
circuit for wrongconnection. Theunitof diode is Volt IV),
displaying the positive -connection voltage-dropvalue.
o When diode testinghas been completed , disconnect the
connection between thetesting leads andthecircuit under test
TheModel
UT33C /UT33D : Testingfor Continuity
Totestfor
continuny , connect the Mete ras below:
I. Insert the redtest lead into theVQmA tennina l and the
black teslleadintothe COM term inal.
2.Setthe
rota ry swnch to "* ",) .
3. Connect the test leads across with the object be'
measured.
The
buzzer sounds if the re sistance 01 a arwt underIesl .
less than 70Q.
Note
o TheLCDdisplays"I" indi cating the circuit being Iesled is
open .
o When continui tytesting hasbeencompleted,lisalnned
connection between thetesting leads andthe circuit
F. Mode l UT33C :T empe rature easureme (see gure61
&> Warn ing
Toavoid harmstoyou or
damages to the Meter, sedo
notattemptto 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 probeInIothe V
andthe
black temperatu reprobeinlo CO e
2.Setthe
rotary swnch to'C Of" .
3. Place the temperature probe tothe 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 Theincluded pointcontact 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 temperatu re measu r ement hasbeencomp leted , discon nectthe
connection between thetestingl eads andthe circuit unde r test.
G.TheModel UT33 B:BatteryTest (seefigure7)
Figure7
&>
Toavoid nns toyouor damages tothe Meter,please donotattempt
to1n1l'1ll.,
ob ges higherthan 60VinDCor30VinAC.
To proceedas
follows:
1.
rolaIy
VQrnA terminal and theblacktest leads into
the COM
appropria e measurement 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 voltag e between
the ca#Jode and anode 01the battery.
Nola
_PlY .... m hasbeen completed , disconnect the connection
be_en ' :Ie .!SlirlQ leadsandthe circuit under test
terminals (red
Note
o The
o The SClJllE! 3Vpp wtlenitisloadedIMQ.
• 'MIensquare
wave oo1put tesllng hasbeen complet ed,d isconnect the
comection betweenIhe te sllng leadsandIhe circuit undertest.
General Specifications
- . MaximumVoltage (including transient 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.lllA ±(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 lnotlessthan 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.TheModel 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 50Hz square wave
...IJr- OUT signel.As a simple signal source with
47KQ resistance output.
Rema rk:
I.Nooverloadprotection.
2
.Make sure vo ltage outpul ofcalibratedequipment level is less
than 10Vtoavoid damages tothe mete r,
Maintenance
Replac ingtheBatteryandReplacingtheFuses
&> Warin ing(Replac ingtheBattery)
Toavoidfalse
readings ,whichcouldleadto possibleelectric
shockor personalInjury,
replace thebatteryas soonas the
batteryindicator
" D "appears.
&> Warining(Replac ingthe Fuses )
Toavoid electricalshock or 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 softhe Meter .
2 Tumthe Meierto
OFF posit ion.
3. Removethe
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 theidentical typeand
specification as follows 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 •••
Thisopeatingmanualis subjecttochangewithoutnolice
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