Extech Instruments MA61 User manual

USERGUIDE
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TrueRMSMiniClampMeters
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MA6160AACClampMeter
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MA6360AAC/DCClampMeter

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Introduction
ThankyouforselectingtheExtechInstrumentsTrueRMSMiniClampMeter.TheMA61
measuresACCurrentwhiletheMA63measuresACandDCCurrent.Bothmetersalsomeasure
AC/DCVoltage,Frequency,Resistance,Capacitance,Diode,andContinuity.
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TheMiniClampMetersmeasurecurrentinthreeACranges600mA,6000mA,and60A.The
MA63onlymeasuresDCcurrentintworanges6000mADCand60ADC.
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TheclampmetersofferadvancedfeaturesthatincludesNCV(non‐contactvoltage)detection
andVFC(variablefrequencycontrol)thatinsertsalowpassfilterinthemeasurementcircuit.
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Thisdeviceisshippedfullytestedandcalibratedand,withproperuse,willprovideyearsof
reliableservice.Pleasevisitourwebsite(www.extech.com)tocheckforthelatestversionofthis
UserGuide,ProductUpdates,ProductRegistration,andCustomerSupport.

Features
•TrueRMSforaccuratereadingsofnoisy,distorted,ornon‐sinusoidalwaveforms
•ModelMA61forACCurrent,AC/DCVoltageMeasurements,andRelativefunction
ModelMA63forAC/DCCurrent/VoltageMeasurements,andZerofunction
Frequency,Resistance,andCapacitanceMeasurements
•Compact0.7"(17mm)jawsizeaccommodatesconductorsupto300MCM
•VariableFrequencyControl(VFC):Lowpassfilterforaccuratemeasurementofvariable
frequencydrivesignalsbyfilteringhigh‐frequencyinterference.
•Built‐inNon‐ContactVoltage(NCV)detector
•Fullrangeoverloadprotection
•6000countbacklitLCDdisplay
•DataHoldfreezesreadingondisplay
•LowbatteryindicatorandAutoPowerOfffeaturewithdisable
•CATII‐600VCATIII‐300Vsafetyrating
•Completewithtestleads,carryingcase,andtwoAAAbatteries

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Safety
TheproductdesignmeetsIEC/EN61010‐1andEN61010‐2‐033.PleasereadtheUserGuide
beforeuseandcomplywithallsafetyinstructions.
ThisproductconformstoULStandards61010‐1,61010‐2‐030,61010‐2‐032,61010‐2‐033andis
CertifiedtoCSAstandardsC22.2no.61010‐1,61010‐2‐030andIECstandards61010‐2‐032and
61010‐2‐033.
SafetyNotices
1. PleaseusetheclampmeteraccordingtothisUserGuideotherwisethebuilt‐inprotections
maybecompromised.
2. Pleasecomplywithwithnationalsafetyregulationswithregardtowearingpersonal
protectiveattireandgeartoavoidinjurayanddamagecausedbyarcdischargingincases
wheretheliveconductorisexposed.
3. Donotallowthefingersorthehandabovetheprotectivefingerguardwhiletesting.
4. Pleasechecktheclampmeterhousing,buttons,switches,andinsulatedwiresforcracksor
otherdamagebeforeeachuse.Serviceorreplaceifnecessary.
5. Pleaseremovetheclampmeterfromalllivecircuitsanddisconnectthetestleadsbefore
removingtherearbatterycompartmentcover.
6. Pleasedonotusetheclampmetertomeasuressignalsgreaterthan600Vorfrequencies
higherthan400Hz.
7. Over‐voltagelevel:CATII600V;CATIII300V,pollutionclass2.
8. Workingnearexposedconductorsmustbedonesousingthehighestcaution.Such
conductorspresentalethalelectricshockhazard.
9. Usecautionmeasuringvoltageequaltoorgreaterthan60VDC,30VACor42VAC(peak)as
thesepresenttheriskofelectricshock.
10. Thisdevicehasamaximummeasurementvoltagelimitof600Vandthesafetystandard
complieswithCE/ETLcertification(EN61010‐1,EN61010‐2‐033,andEN61010‐2‐032).
InternationalSafetySymbols

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MeterDescription
1. ClampJaws
2. MeasuredConductor
3. NCVNon‐ContactVoltageDetectorlamp
4. FunctionSelectSwitch
5. MODEButton
6. LCDDisplay
7. COMInputTestLeadTerminal
8. PositiveInputTestLeadTerminal
9. REL(Relative)buttononMA61;ZERObuttononMA63
10. DisplayHold/backlightbutton
11. Jawtriggeropen/closecontrol
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Fig‐1MeterParts
1
23 4 5 6
7
8
910
11
ControlButtonsDescription
ButtonDescription
PressandholdtoselectVFC(variablefrequencycontrol,lowpassfilter)
MA63only:ShortpresstoselectDC,ACorFrequency(Hz)
MA63only;PresstoaccesstheZEROmode
MA61only;PresstoaccesstheRelativemode
Shortpresstofreeze/unfreezethedisplayedreading
PressandholdtotogglethebacklightON‐OFF

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Function Switch Description
MODELMA61
1. NCV:Non‐ContactVoltageDetector
2. 60AACMeasurements
3. 600mAACMeasurements
4. 6000mAACMeasurements
5. Resistance,Diode,Continuity,andCapacitanceMeasurements
6. ACorDCVoltageandFrequencyMeasurement
7. POWEROFFselection
8. FunctionSelectorDial
MODELMA63
9. NCV:Non‐ContactVoltageDetector
10. 60AACwithFrequencyorDCMeasurements
11. 600mAACwithFrequencyorDCMeasurements
12. 6000mAACwithFrequencyorDCMeasurements
13. Resistance,Diode,Continuity,andCapacitanceMeasurements
14. ACorDCVoltageandFrequencyMeasurements
15. POWEROFFselection
16. FunctionSelectorDial
Fig‐2FunctionSwitch
1
2
3
4
5
6
78
9
10
11
12
13
14
15 16
Model MA61 Model MA63

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Display Icon Descriptions
LowBattery
TrmsTrueRMSmeasurement
DCDirectcurrent
ACAlternatingcurrent
AUTOAutomaticrange
‐ Minussign;negativereading
)))AudibleContinuitymode
Diodetest
HDisplayhold
AutoPowerOFF(APO)icon(switchesoffwhenAPOisdisabled)
ZERO/RELZero(MA63)andRelative(MA61)functions
VFCVariableFrequencyControl(lowpassfilter)forACVoltage/Current
EFNCV(Non‐ContactVoltage)Detector(EF:ElectromotiveForce)
mA,AAmpere:Unitofcurrent
mV,VVolt:Unitofvoltage
Ω,kΩ,MΩOhm:Unitofresistance
F,µF,nF Farad:Unitofcapacitance
O.LOver‐rangemeasurement
Measurementunitprefixes
m(milli‐)10‐3
µ(micro‐)10‐6
n(nano‐)10‐9
k(kilo‐)103
M(mega‐)106


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Operation
MeterPower
Caution:Donotusethemeterwithbatterycompartmentopenorunsecured.
Theclampmeterispoweredbytwo(2)AAAbatteries.Thebatterycompartmentislocatedonthe
backofthemeter.ThebatterycompartmentissecuredbyonePhillipsheadscrew.Refertothe
BatteryReplacementsectionlaterinthisguideformoreinformation.
AutomaticPowerOFF(APO)
Themeterautomaticallyswitchesoffafter15minutesofinactivity.Beforeswitchingoff,themeter
beepsseveraltimestoalerttheuser.TodisableAPO,holddowntheMODEbuttonwhilepowering
upthemeter.Themeterwillbeepfive(5)timesindicatingthatAPOisdisabled;releasethebutton.
NotethattheAPOiconisnotvisibleonthedisplaywhenAPOisdisabled.APOisre‐enabledon
thenextcyclingofmeterpower.
CurrentMeasurements‐ClampingTechnique
Clamparoundonlyoneconductor.RefertoFig‐3below.Thediagramatleftiscorrectandthe
diagramatrightisincorrect.



Fig‐3CorrectandIncorrectClampingTechniques

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ACCurrentMeasurements
WARNING:Toavoidelectricshock,disconnectthetestleadsfromthemeterbeforemaking
currentmeasurements.
CAUTION:ObserveCATII600V,CATIII300VwithrespecttoEarthGroundfortheJaw.
1. SettheFunctionswitchtothe600mA,6000mA,or60Arange.
2. FortheMA63,shortpresstheMODEbuttontoSelectAC,Frequency(orDC)
3. PresstheTriggertoopentheclampjaw.
4. Clampontoasingleconductor(fullyenclosingit).Donotallowagapbetweenthetwohalves
ofthejaw.RefertoFig‐3earlierintheOperationsection.
5. Whenmeasuringvariablefrequencydevices,pressandholdtheVFCbuttontostart/stop
measuringwiththelowpassfilter.
6. ReadtheACAvalueontheLCD.
DCCurrentMeasurements(MA63only)
WARNING:Toavoidelectricshock,disconnectthetestleadsfromthemeterbeforemaking
currentmeasurements.
CAUTION:ObserveCATII600V,CATIII300VwithrespecttoEarthGroundfortheJaw.
1. SettheFunctionswitchtothe600mA,
6000mA,or60Arange.
2. UsetheMODEbuttontoselectDC.
3. PresstheZERObuttonseveraltimestonull
themeterdisplaywithoutaconductorin
theclampjaw.Zerothemeterwiththe
clampheldinthesameorientationasthe
actualmeasurement(seeFig‐4).
4. PresstheTriggertoopenthecurrentsense
Jaw.
7. Fullyencloseasingleconductor.Donot
allowagapbetweenthetwohalvesofthe
jaw.RefertoFig‐3earlierinthisguide.
5. ReadtheDCAvalueontheLCD.



Fig‐4CorrectandIncorrectZERO
techniques
ZERO
ZERO

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FrequencyMeasurements
WARNING:Toavoidelectricshock,disconnectthetestleadsfromthemeterbeforemaking
currentmeasurements.
CAUTION:ObserveCATII600V,CATIII300VwithrespecttoEarthGroundfortheJaw.
1. SettheFunctionswitchtotheHzposition.
2. PresstheTriggertoopenthejawandfullyencloseoneconductor.RefertotheFig‐3inthe
CurrentClamptechniquesectionabove.
3. ReadtheFrequencymeasurementontheLCDinHz.
VoltageMeasurements
WARNING:Donotapply>600VAC/DCbetweenthemeter’sterminalsandearthground
CAUTION:Whenconnectingthetestleadstothecircuitordeviceundertest,connectthe
blackleadbeforethered;whenremovingthetestleads,removetheredbeforetheblacklead.
ACVoltageMeasurements
1. Inserttheblacktestleadbananaplugintothenegative
(COM)jackandtheredtestleadbananaplugintothe
positive(V/Ω)jack.
2. TurnthefunctionswitchtotheVposition.
3. UsetheMODEbuttontoselectACifnecessary.Usethe
MODEbuttontoalsoselectthefrequencyofthemeasured
voltage.
4. Touchthetestprobetipstothecircuitundertest.
5. Readthevalueinthedisplay.Thedisplaywillindicatethe
properdecimalpoint.




Fig‐5ACVOLTAGEMEASUREMENT

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DCVoltageMeasurements
1. Inserttheblacktestleadbananaplugintothenegative(COM)jackandtheredtestlead
bananaplugintothepositive(V/Ω)jack.
2. MovetheFunctionSwitchtotheVposition.
3. PresstheMODEbuttontoselectDCifnecessary.
4. Touchthetestprobetipstothecircuitundertest.Besureto
observethecorrectpolarity(redleadtopositive,blackleadto
negative).
5. Readthevoltageinthedisplay.Thedisplaywillindicatethe
properdecimalpointandvalue.Ifthepolarityisreversed,the
displaywillshow(‐)minusbeforethevalue.
6. ThemeteriscapableofdetectingDCvoltagesto600V.
7. Whenvoltageismeasured,theNCVvoltagedetectLEDwillbe
lit.

Fig‐6DCVOLTAGEMEASUREMENT



ResistanceMeasurements
Cautions:SwitchOFFpowertothedeviceundertestbeforemeasuring.Donottestoncircuits
ordeviceswhere60VDCor30VACispresent.
1. Inserttheblacktestleadbananaplugintothenegative
(COM)jack.Inserttheredtestleadbananaplugintothe
positive(V/Ω)jack.
2. TurntheFunctionSwitchtotheΩposition.
3. UsetheMODEbuttontoselecttheΩicononthedisplay
indicatingresistanceonly(withouttheaudiblecontinuity
iconshowing).
4. Touchthetestprobetipsacrossthecircuitorpartunder
test.Itisbesttodisconnectonesideofthepartundertest
sotherestofthecircuitwillnotinterferewiththe
resistancereading.
5. Readtheresistanceinthedisplay.Thedisplaywillindicate
theproperdecimalpointandvalue.

Fig‐7RESISTANCEMEASUREMENT

MA61_MA63-en-GB_V1.0 3/15
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ContinuityMeasurements
1. InserttheblacktestleadintothenegativeCOMterminalandtheredtestleadintothe
positiveterminal.
2. Setthefunctionswitchtothe)))position.
3. UsetheMODEbuttontoselecttheContinuitymode.LookfortheContiniutyicon)))onthe
display.
4. Touchthetestprobetipsacrossthecircuitorcomponentundertest.RefertoFig‐7inthe
Resistancemeasurementsection.
5. Iftheresistanceis<10Ω,thebeeperwillsound.


CapacitanceMeasurements
WARNING:Toavoidelectricshock,removepowertothecircuitundertestanddischargethe
capacitorundertestbeforemeasuring.Donottestoncircuitsordeviceswhere60VDCor
30VACispresent.
1. Setthefunctionswitchtothecapacitanceposition.
2. InserttheblacktestleadbananaplugintothenegativeCOM
jack
andtheredtestleadbananaplugintothepositivejack.
3. PressMODEtoselecttheunitofmeasuresymbolF.
4. Touchthetestprobetipsacrossthepartundertest.
5. UsetheRELbutton(MA61)ortheZERObutton(MA63)
especiallyforlowcapacitancemeasurements<1µFfor
Relativemeasurements.
6. Readthecapacitancevalueinthedisplay.
7. Thedisplaywillindicatetheproperdecimalpointandvalue.
Note:Forlargevaluesofcapacitanceseveralminutesmaybe
requiredbeforethefinalreadingstabilizes.
Fig‐8CAPACITANCEMEASUREMENT



MA61_MA63-en-GB_V1.0 3/15
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DiodeTest
1. InserttheblacktestleadbananaplugintothenegativeCOMjackandtheredtest
leadbananaplugintothepositivejack.
2. Turnthefunctionswitchtoposition.UsetheMODE
buttontoselectthediodefunctionifnecessary(thediodeand
voltagesymbolswillappearontheLCDwheninDiodetest
mode).
3. Touchthetestprobetipstothediodeorsemiconductor
junctionundertest.Notethemeterreading
4. Reversethetestleadpolaritybyreversingtheredandblack
leads.Notethisreading
5. Thediodeorjunctioncanbeevaluatedasfollows:
Ifonereadingdisplaysavalue(typically0.400Vto
0.900V)andtheotherreadingdisplaysOL,thediodeis
good.
IfbothreadingsdisplayOLthedeviceisopen.
4. Ifbothreadingsareverysmallor‘0’,thedeviceisshorted.

Fig‐9DIODETEST


MA61_MA63-en-GB_V1.0 3/15
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NCVNon‐ContactACVoltageDetector
CAUTION:RemovetestleadsfrommeterbeforeattemptingNCVtests.Alwaysverifythe
NCVfunctiononaknownlivecircuitbeforeperformingtests.DonotusetheNCVfunctionifthe
displaydoesnotshowEFwhenthefunctionswitchisturnedtotheNCVposition.Ifthemeter
doesnotswitchonwhentheNCVmodeisinitiated,pleasecheckthebatteries.
WiththemeteronandswitchedtotheNCVmode,holdingthefronttipoftheclampjawneara
liveelectrical,electromagnetic,orelectrostaticfieldcausesthebeepertosound,thedisplayto
showsdashes,andtheredLEDlamptoflash.Thethresholdis100V.Thegreaterthefield
strengththegreaterthenumberofdashesandthefastertherateoftheaudiblebeepsandthe
flashingLEDlamp.
Ifthemeterdoesnotemitatoneordisplaydashesinthismode,thereisstillthepossibilitythat
voltageispresent.Pleaseusecaution.
1. TurntheFunctionswitchtotheNCVpositiontoaccesstheNon‐ContactVoltageDetect
mode.
2. NotethevoltagedetectiondisplayiconNCVandthelargerEFdisplay.Ifthesedisplaysare
notseenwhentheNCVmodeisaccesseddoNOTattempttousethemeter.Checkthe
batteriesandtryagain.Ifthemeterstilldoesnot
switchonwhentheNCVmodeisaccessedplease
havethemeterservicedorreplaced.
3. Placethemeternearasourceofelectricalenergy.
Thefronttipoftheclampoffersthehighest
sensitivity.
4. Notetheaudiblebeeping,thedashdisplays,andthe
flashingLEDlampwhenanelectricalor
electromagneticfieldofatleast100Vissensed.Note
thatelectrostaticenergywilltriggertheNCV
detector,thisisnormal.
Fig‐10NON‐CONTACTACVOLTAGEDETECTOR

DataHold
TofreezethedisplayedreadingontheLCD,presstheDataHold(H)button(theHiconwill
appearonthedisplay).ToreleasetheDataHoldfunctionandreturnthemetertonormal
operation,presstheDataHold(H)buttonagain(theHiconwillswitchoff).

MA61_MA63-en-GB_V1.0 3/15
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Zero/RelativeMeasurements
1. PressZERO(MA63)orREL(MA61)toenterthemode.ThedisplaywillshowtheZEROicon.
2. NoweachtimetheZERO/RELbuttonispressedthepresentmeasurementwillzeroandthe
beeperwillsound.ThismodeisespeciallyusefulforDCAmeasurementzeroing.
3. Inthismode,allsubsequentmeasurementsaredisplayedwithrespecttothereference
measurement.Forexample,ifa20Vreadingiszeroedanda30Vreadingissubsequently
measured,theLCDwilldisplay10V.
4. UsetheRELbutton(MA61)ortheZERObutton(MA63)especiallyforlowcapacitance
measurements<1µFforRelativemeasurementsandDCAmeasurements.
5. Toreturntonormaloperation,pressandholdtheZEROorRELbuttonuntiltheZERO
displayiconswitchesOFF.

BatteryReplacement
CAUTION:Pleasedisconnectthetestleadsfromthemeter,turnthemeteroff,andunclampthe
meterfromanyconductorsbeforeattemptingtochangethebatteries.
1. WhenthelowbatterysymbolappearsontheLCD,thebatteriesmustbereplaced.
2. Turnthemeteroffandremovetherearbatterycompartmentscrew.
3. Liftoffthebatterycompartmentcoverandreplacethetwo1.5VAAAcellsobservingcorrect
polarity.
4. Replacethecompartmentcoverandsecurethescrewbeforeusingthemeter.

You,astheenduser,arelegallybound(EUBatteryordinance)toreturnallusedbatteries,
disposalinthehouseholdgarbageisprohibited!Youcanhandoveryourusedbatteries/
accumulatorsatcollectionpointsinyourcommunityorwhereverbatteries/accumulatorsare
sold!
Disposal:Followthevalidlegalstipulationsinrespectofthedisposalofthedeviceattheendof
itslifecycle
Cleaning
WiththemeterOFF,useonlyadryclothtowipecleanthemeterhousing.Donotuseharsh
soaps,abrasives,orsolventstocleanthemeterhousing.


MA61_MA63-en-GB_V1.0 3/15
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Specifications
GeneralSpecifications
Display6000countLCDwithmultifunctionindicators
Fullscale6200countsforCapacitancefunction
Fullscale9999countsforFrequencyfunction
LEDlampForNon‐ContactVoltageDetector
FunctionsCurrent(ACA,DCA),Voltage(VAC,VDC),Resistance,
Capacitance,Frequency,Non‐ContactVoltagedetector,
Continuity,andDiodetest
Polarity“‐“indicatesnegativepolarity(positivepolarityassumed)
CurrentsensorHalleffect
OverloadindicationO.L
DCAzeroadjustMA63:One‐touchZERObutton(alsousedasaRelative
function);MA61:RELbutton(Relative)
Displayrate2~3readings/second
BatteryTwo1.5VAAAbatteries
Operatingtemperature00Cto400C(320Fto1040F)
OperatingHumidity<75%RH0~30C(320Fto860F)
<50%RH30~40C(860Fto1040F)
Storagetemperature‐100Cto500C(140Fto1220F)
Altitude2000m(6562’)
Powerconsumption20mADCapprox.
Weight170g(6.0oz.)includingbattery
Dimensions175x60x33.5mm(6.9x2.4x1.3”)(HxWxD)
Jawopening17mm(0.7”)3000MCM
StandardsIEC/EN61010‐1,EN61010‐2‐033,EN61010‐2‐032;CategoryIII
300V,CategoryII600V;pollutionclass2
Electromagnetic
compatibility
<1V/mRFfield:Overallaccuracy=specifiedaccuracy+5%of
therange.Unspecifiedindicationfor1V/mRFfield.
TestLeadsUseonlytestprobesratedCATII600V,CATIII300Vorbetter
thatmeettherequirementsofIEC61010‐031


MA61_MA63-en-GB_V1.0 3/15
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RangeSpecifications
Accuracystatedforambientconditions230C±50C(73.40F±90F)
DCCurrent(MA63)ResolutionAccuracy(ofrdg+digits)Overload
6000mA1mA±(2.0%+5d)100ADC
60A 0.01A±(2.0%+3d)100ADC
ACCurrentResolution50/60Hz≥100Hz≤400Hz Overload
600.0mA0.1mA±(1.5%+10d)±(2.0%+10d)100A/600VAC
6000mA1mA±(2.5%+5d)±(3.0%+5d)100A/600VAC
60A0.01A±(2.0%+5d)±(2.5%+5d)100A/600VAC
VFC600.0mA~60A0.1mA~0.01A±(4.0%+10d)100A/600VAC
Notes:Accuracystatedfor5~100%ofrange;<20digitresidualreadingfor600mAopencircuit.
ACCrestFactormayreach3.0at4000counts;fornon‐sinusoidalwaveformstheCrestFactorerror
increasesperthefollowing:Add3%whenthecrestfactoris1~2;Add5%whenthecrestfactoris2~2.5;
Add7%whenthecrestfactoris2.5~3
DCVoltageResolutionAccuracyOverloadProtect
600.0mV0.1mV±(0.7%+5d)600V
6.000V1mV
±(0.7%+3d)
600V
60.00V10mV600V
600.0V0.1V600V
600V1V600V
Notes:For600mVrangetheInputImpedanceis≥1Gohm;forotherrangestheaverageimpedanceis10M
ohm.
ACVoltageResolutionAccuracyOverload
6.000V1mV
±(0.8%+3d)
600V
60.00V10mV600V
600.0V0.1V600V
600V1V±(1.0%+3d)600V
VFC200V~600V0.1V±(4.0%+3d)600V
Notes:Inputimpedanceapproximately10Mohm
DisplayTrueRMS;FrequencyResponse45~400Hz

MA61_MA63-en-GB_V1.0 3/15
17
Accuracystatedfor5~100%ofrange;<20digitresidualreadingfor600mAopencircuit.
ACCrestFactormayreach3.0at4000counts;fornon‐sinusoidalwaveformstheCrestFactorerror
increasesperthefollowing:Add3%whenthecrestfactoris1~2;Add5%whenthecrestfactoris2~2.5
Add7%whenthecrestfactoris2.5~3
Frequency(Hz)ResolutionAccuracyOverloadProtect
10Hzto60kHz0.001~0.01kHz±(0.1%+4d)600V
Notes:Inputamplitude≥10V(DClevel:0);Frequencyof65kHzorhigherforreferenceonly
ResistanceResolutionAccuracyOverload
600.0Ω 0.1Ω ±(1.0%+2d)600V
6.000kΩ 1Ω
±(0.8%+2d)

600V
60.00kΩ 10Ω 600V
600.0kΩ 100Ω 600V
6.000MΩ 1kΩ ±(1.2%+3d)600V
60.00MΩ 10kΩ ±(1.5%+5d)600V
CapacitanceResolutionAccuracyOverload
6.200nF1pFInREL/ZEROmode:
±(4.0%+10d)
600V
62.00nF~620.0µF10pF~0.1µF±(4.0%+5d)600V
6.200mF~62.00mF1µF~10µF±(10%)600V
Note:Forbestaccuracy,useREL(MA61)orZEROfunction(MA63)whenmeasuring≤1µF
ContinuityResolutionNotesOverload
)))0.1Ω Beepersounds≤10Ω 600V
DiodeResolutionNotesOverload
1mVOpencircuitvoltageis3.2V
approx.
Normalvoltagerange:
0.5V~0.8V
600V

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