Extech Instruments MA160 User manual

USERGUIDE
TrueRMS200AAC/DCOpenJawClampMeter
ModelMA160



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TableofContents
1.INTRODUCTION3
2.SAFETYINFORMATION4
3.DESCRIPTIONS6
4.OPERATION9
PoweringtheMeter9
DisplayBacklight9
WorkLight9
DataHold9
TestLeadConsiderations9
VoltageMeasurements10
ACVoltageMeasurements10
DCVoltageMeasurements11
CurrentMeasurementsUsingtheClamp12
Non‐ContactVoltageDetector13
ResistanceMeasurements14
ContinuityMeasurements15
CapacitanceMeasurements16
DiodeTest17
5.MAINTENANCE18
6.SPECIFICATIONS19
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1. Introduction
ThankyouforselectingtheExtechMA160ClampMeter.

TheMA160isafeature‐packedOpenJawTrueRMSdigitalClampmeter.

MeasureAC/DCvoltage,ACcurrent,DCcurrent,Resistance,Diode,Continuity,andCapacitance.
TheMA160alsoincludesaNon‐ContactVoltageDetectionfeature.

OtherfunctionsincludeDataHold,Relativemode,Worklight,Backlight,andAutopower‐off.
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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
6000countdigitaldisplay
LargebacklitLEDdisplay
TrueRMSACmeasurements
0.8%DCVaccuracy
DataHold
Relativemode
AutoPowerOFF(APO)
200AACcurrentmeasurements
200ADCCurrentMeasurements
Non‐ContactVoltageDetector
Visualandaudiblecontinuitymeasurementalert
Lowbatteryindicator
CATIII600V/CATII1000V

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2. SafetyInformation
Toensurethesafeoperationandserviceofthemeter,followtheseinstructionsclosely.Failureto
observewarningscanresultinsevereinjury.
WARNINGS
WARNINGSidentifyhazardousconditionsandactionsthatcouldcauseBODILYHARMorDEATH.
Whenhandlingtestleadsorprobes,keephandsandfingersbehindthefingerguardsatalltimes.To
avoidelectricalshockdonottouchexposedelectricalwire,connectors,unusedinputterminals,or
circuitsundertest.
Removetestleadsfromthemeterbeforeopeningthebatterycompartmentormeterhousing.
UsethemeteronlyasspecifiedinthisUserGuideoraccompanyingQuickStarttoavoidcompromising
theprotectionsprovidedbythemeter.
Besuretousetheproperterminals,switchpositions,andrangeswhentakingmeasurements.
Verifythemeter’soperationbymeasuringaknownvoltage.Havethemeterservicedifthemeter
respondsunusuallyoriftherearequestionsregardingthemeter’sfunctionalintegrity.
Donotapplymorethantheratedvoltage,asmarkedonthemeter,betweenterminalsorbetweenany
terminalandearthground.
Donotmeasurevoltagesabove1000VDCor600VACbetweenterminalandgroundtopreventelectrical
shockanddamagetotheClampmeter.
Usecautionworkingwithvoltagesabove30VACRMS,42VACpeak,or60VDC.Thesevoltagesposea
shockhazard.
Toavoidmisleadingreadingsthatcouldleadtoelectricshockandinjury,replacethebatteriesassoonas
thelowbatteryindicatorisdisplayed.
Disconnectpowertothecircuitundertestanddischargeallhigh‐voltagecapacitorsbeforetesting
resistance,continuity,diodes,orcapacitance.
Donotusethemeterinthepresenceofexplosivegasorvapor.
Toreduceriskoffireorelectricshock,donotusethemeterifitiswetanddonotexposethemeterto
moisture.
IndividualprotectiveequipmentshouldbeusedifHAZARDOUSLIVEpartsintheinstallationwhere
measurementsaretobecarriedoutcouldbeaccessible.

CAUTIONS
CAUTIONSidentifyconditionsandactionsthatcouldcauseDAMAGEtothemeterorequipment
undertest.Donotexposethemetertoextremesintemperatureorhighhumidity.
Disconnectthetestleadsfromthetestpointsbeforechangingthepositionofthefunction(rotary)
switch.
Donotexposethemetertoextremesintemperatureortohighhumidity.
Neversetthemetertotheresistance,diode,capacitance,micro‐amp,orampfunctionswhen
measuringthevoltageofapowersupplycircuit;thiscouldresultinmeterdamageanddamagetothe
equipmentundertest.
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SafetySymbolsthataretypicallymarkedonmetersandinstructions
Thissymbol,adjacenttoanothersymbol,indicatestheusermustrefertothe
manualoruserguideforfurtherinformation.
Riskofelectricalshock
Equipmentprotectedbydoubleorreinforcedinsulation

LowBatterysymbol
ConformstoEUdirectives
Donotdiscardthisproductinhouseholdtrash.
ACmeasurement
DCmeasurement
Earthground

PERIEC1010OVERVOLTAGEINSTALLATIONCATEGORY
OVERVOLTAGECATEGORYI
EquipmentofOVERVOLTAGECATEGORYIisequipmentforconnectiontocircuitsinwhichmeasuresare
takentolimitthetransientover‐voltagestoanappropriatelowlevel.
Note–Examplesincludeprotectedelectroniccircuits.
OVERVOLTAGECATEGORYII
EquipmentofOVERVOLTAGECATEGORYIIisenergy‐consumingequipmenttobesuppliedfromthefixed
installation.
Note–Examplesincludehousehold,office,andlaboratoryappliances.
OVERVOLTAGECATEGORYIII
EquipmentofOVERVOLTAGECATEGORYIIIisequipmentinfixedinstallations.
Note–Examplesincludeswitchesinthefixedinstallationandsomeequipmentforindustrialusewith
permanentconnectiontothefixedinstallation.
OVERVOLTAGECATEGORYIV
EquipmentofOVERVOLTAGECATEGORYIVisforuseattheoriginoftheinstallation.
Note–Examplesincludeelectricitymetersandprimaryover‐currentprotectionequipment
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3. Descriptions

MeterDescription
1. Non‐ContactVoltageDetector
2. Openjaw
3. WorkLight
4. NCValertLEDlamp
5. WorkLightswitch
6. Rotaryfunctionswitch
7. Mode(M)button
8. Relative,DCAZerobutton
9. HOLDandBacklightbutton
10. Display
11. Testleadjacks
Note:Batterycompartmentonbackofmeter








Fig3‐1METERDESCRIPTION
1
3
11
10
9
8
6
5
2
7
4
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DisplayIconDescriptionsforMA160

Fig3‐2MA160METERDISPLAY
1. Unitsofmeasure
2. DCAZero
3. Relativemode
4. Datahold
5. AlternatingCurrent
6. DirectCurrent
7. Automaticrange
8. Continuity
9. Diode
10. Capacitance
11. Non‐ContactVoltageDetector
12. Autopoweroff
13. Batterystatus
14. LCDdisplay

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Push‐ButtonDescriptions
MomentarypressesoftheMode(M)buttonperformthefunctionsshowninthetable
below.

Fig.3‐4Mode(M)ButtonFunctionTable
SwitchPositionMode(M)ButtonFunction
ACDC

AC DC
Ω   
Momentarilypresstoaccess/exittheRelativemode.Thismodeofoperationisonly
availableforAC/DCvoltage,ACCurrent,andCapacitance.
InDCAmode,presstozerothedisplay;pressandholdtoexitthezero.
Pressandholdthisbuttontoactivate/deactivatetheLCDbacklight.Momentary
pressesswitchDATAHOLDONorOFF.
FunctionSwitchDescription
1. MeterPOWEROFFposition
2. AC/DCCurrentmode(useMbuttontochooseACorDC)
3. AC/DCVoltagemode(useMbuttontochooseACorDC)
4. Capacitance,Continuity,Diode,Resistancemodes
(useMbuttontochoosemode)
5. Non‐ContactVoltageDetectpositionwithalertLED

Fig3‐3MA160FunctionSwitch
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4. Operation
CAUTION:ReadandunderstandalloftheSafetystatementslistedinthesafetysection
ofthismanualpriortouse.
PoweringtheMeter
1. Turntherotaryfunctionswitchtoanypositiontopowerthemeter.Checkthebatteriesifthe
unitfailstopowerON.RefertotheMaintenancesectionforbatteryreplacement.
2. TurnthefunctionswitchtotheOFFpositiontopowerOFFthemeter.
3. ThemeterhasanAutoPowerOFFfeature(APO)wherethemeterswitchesOFFafter15
minutesofinactivity.WhenAPOisenabled,theAPOiconwillshowonthedisplaywhenthe
meterispoweredON,
Thelowbatterysymbolappearsonthedisplaywhenthebatteryvoltageweakensbelowthe
threshold.
DisplayBacklight
WiththemeterpoweredON,pressandholdthebacklightbuttontoswitchthebacklightONor
OFF.Notethatexcessiveuseofthebacklightwillshortenthebatterylife.
WorkLight
WiththemeterpoweredON,presstheWorkLightbuttonontherightsideofthemeter.A
momentarypresswillswitchtheWorkLightoff.TheWorkLightlampislocatedonthebackofthe
unittowardthebottomoftheclampjaw.Notethatexcessiveuseofthebacklightwillshortenthe
batterylife.
DataHold
TofreezetheLCDmeterreading,presstheDataHold(H)button.Whiledataholdisactive,theH
displayiconappearsontheLCD.Pressthe(H)buttontoreturntonormaloperation.TheHiconwill
switchOFF.
TestLeadConsiderations
TestleadprobecoverscanberemovedforCATII1000Vinstallations.Usethetestleadprobe
coversforCATIII1000Vinstallations.Donotmeasurevoltages>1000VDCor600VAC.Remove
thestoragecapsfromthemeterendoftestleadsbeforeconnectingleadstothemeter.
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VoltageMeasurements
WARNING:
RemovethetestleadprobecoversforCATII1000Vinstallations.Usethetestleadprobecovers
forCATIII600Vinstallations.
Donotmeasurevoltagesgreaterthan600VACor1000VDC.
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.
Disconnectprobesandcircuitundertestafterallmeasurementsarecompleted.
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position.UsetheMbuttontoselectAC.
3. ReadtheWarningandCautionstatementsabovetodeterminewhetherornottousethe
testleadprobecovers.
4. Touchthetestprobetipstothecircuitundertest.
5. Readthedigitalvalueshownonthedisplay.ThemeterisAutoRangingandtherefore
selectstheproperdecimalpointposition.Themeteralsodisplaysthemeasurement
type,unitsymbols,andotherrelevantmultifunctionicons.
6. ThemeteriscapableofdetectingACvoltagesto600V.

Fig4‐1ACVOLTAGEMEASUREMENTS
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MA160‐en‐GB_V1.010/15
11
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 position.
3. UsetheMbuttontoselectDC.
4. ReadtheWarningandCautionstatementsatthebeginningoftheVoltageMeasurement
sectiontodeterminewhetherornottousethetestleadprobecovers.
5. 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).
6. Readthedigitalvalueofthemeasurementinthedisplay.Thedisplaywillalsoindicate
theproperdecimalpoint(AutoRange)andmeasurementtype/unitssymbols.Ifthe
polarityisreversed,thedisplaywillshow(‐)minusbeforethevalue.
7. ThemeteriscapableofdetectingDCvoltagesto1000V.

Fig4‐2DCVOLTAGEMEASUREMENTS

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MA160‐en‐GB_V1.010/15
12
CurrentMeasurementsUsingtheClamp
WARNING:Donotmeasurethecurrentonacircuitwhenthevoltageincreasestomore
than750VACor1000VDC.Thiscancausedamagetotheinstrumentandcancauseinjuryto
persons.



Fig.4‐3CorrectandIncorrectClamping
1. Ensurethattheprobeleadsaredisconnectedfromthemeter.
2. Setthefunctionswitchtotheposition.
3. UsetheMbuttontoselectACorDC.ForDCpressZEROtoremoveanyresidual
magnetismandtonullthedisplaybeforeclampingontoaconductor.
4. Placethemetersoonlyoneconductorislocatedatthebaseofthejaws.Foroptimum
results,centertheconductorinthejaws.
5. Readthecurrentmeasurementinthedisplay.Thedisplaywillindicatetheproperdecimal
pointandvalue.InDC,whenthepolarityisreversed,thedisplaywillshow(‐)minus
beforethevalue.
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MA160‐en‐GB_V1.010/15
13
Non‐ContactVoltageDetector
WARNING:Itispossibleforvoltagetobepresentinacircuitevenifthemeterdoesnot
beeporflashtheNCVLEDlamp.AlwaysverifymeteroperationonaknownliveACcurrent
circuitandverifythatthebatteriesarefreshbeforeuse.

WhenthemetersensesanACVoltageorelectromagneticfield>100VAC,thefollowingoccurs:
TheaudiblebeepersoundsONandOFF
TheLEDlampflashesONandOFF
Thedisplayshows1,2,3,or4dashes
Thegreatertheelectricalfieldstrength,thefastertherateoftheaudiblebeeper,theflashingof
theLEDlamp,andthenumberofdashesdisplayed.Ifthemeterdoesnotemitatoneorflash
theLED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selectNon‐ContactVoltageDetectmode.
2. NotethatEFisdisplayedwheninthismode.IftheEFdoesnotdisplaywhenthefunction
switchisturnedtotheNCVposition,checkthebatteriesanddonotusethemeteruntilEF
isdisplayed.
3. Totest,placethemeternearasourceofelectricalenergy.Notethatthetipofthemeter
offersthehighestsensitivity.
4. Notetheaudiblebeeping,theflashingLED,andthedisplayeddasheswhenasourceof
electricalenergyisdetected.

Fig4‐4NON‐CONTACTVOLTAGEDETECTOR
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MA160‐en‐GB_V1.010/15
14
ResistanceMeasurements
CAUTION: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MbuttontoselecttheΩicononthedisplayindicatingresistanceonly(without
thecontinuity/diode/capacitanceicons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valueinthedisplay.Thedisplaywillindicatetheproperdecimal
pointandvalue.Ifthereadingisoutofrange,theOLdisplayiconwillappear.

Fig4‐5RESISTANCEMEASUREMENTS
ResistanceMeasurementNotes:
Thedisplaywillshow“OL”whenanopencircuitisdetectedoriftheresistance>maximum
range.
Thetestleadsintroduceanerrorofapprox.0.1Ω～0.2Ωforlowresistancemeasurements.
UsetheRelativemodetoobtainaccuratereadings.Shortthetestleadstogether,pressthe
RELbutton,andthenmeasurealowresistance.Themetersubtractstheshort‐circuitvalue
fromthereading.
Ifthetestleadresistanceofprobeis>0.5Ωwhenshorted,inspectthetestleadsandthe
connection.
Itmaytakeseveralsecondsforthereadingtostabilizewhenmeasuringresistance>1MΩ.
Thisisnormaloperation.
Forpersonalsafety,donotmeasureacircuitwithvoltages>30VDCorAC.

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MA160‐en‐GB_V1.010/15
15
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MbuttontoselecttheContinuitymode.LookfortheContinuityicononthe
display.
4. Touchthetestprobetipsacrossthewireorcircuitundertest.
5. Iftheresistanceis<10Ω,thebeeperwillsoundcontinuously.Iftheresistanceisbetween
10and100Ωthebeepermayormaynotsound.Foranopencircuitconditionthemeterwill
displayOL.



Fig4‐6CONTINUITYMEASUREMENTS
ContinuityMeasurementNotes:
Turnoffpowertothecircuitundertestanddischargecapacitorsbeforemeasuring
continuity.
Open‐circuitvoltageisapprox.‐3.5V
Disconnecttestleadsandcircuitmeasuredaftermeasurementsarecompleted.
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MA160‐en‐GB_V1.010/15
16
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theMbuttontoselecttheunitofmeasuresymbolF.
4. Touchthetestprobetipsacrossthepartundertest.
5. Forsmallcapacitancevalues,usetheRelativemodetoremovetestleadandprobe
capacitance.
6. Readthecapacitancevalueinthedisplay.
7. Thedisplaywillindicatetheproperdecimalpointandvalue.

Fig4‐7CAPACITANCEMEASUREMENTS
CapacitanceMeasurementNotes:
Thedisplaywillshow“OL”ifacapacitorisshortcircuitedorifthemeasuredcapacitance>
maximumrangeoftheinstrument.
Capacitancemeasurements>600μFmayrequireseveralsecondstoobtainastable
reading.
Inordertoensuremeasurementaccuracy,dischargeresidualchargesbeforemeasuring
capacitance;Usemaximumsafetywhenworkingwithhighvoltagecapacitorstoprevent
damagetotheinstrumentandrisktopersonalsafety.
Disconnecttestleadsandcircuitundertestaftermeasurementsarecompleted.
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MA160‐en‐GB_V1.010/15
17
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Mbuttontoselectthediodefunction,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reversereadingdisplays
OL,thediodeisgood.
IfbothreadingsdisplayOLthedeviceisopen.
Ifbothreadingsareverysmallor‘0’,thedeviceisshorted.

Fig4‐8DIODETESTING
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MA160‐en‐GB_V1.010/15
18
5. Maintenance
WARNING:Toavoidelectricalshock,removethetestleads,disconnectthemeterfromany
circuitandturnOFFthemeterbeforeopeningthecase.Donotoperatewithanopencase.
BatteryReplacement
1. Removethetestleadsfromthemeter.
2. RemovethePhillipsheadscrewthatsecuresthebatterycompartmentcoveronthebackof
themeter.
3. OpenthebatterycompartmentandreplacethetwoAAbatteries,observingcorrect
polarity.Re‐assemblethemeterbeforeuse





BatterySafetyNotes:Pleasedisposeofbatteriesresponsibly;neverdisposeofbatteriesinafire,
batteriesmayexplodeorleak.Ifthemeterisnottobeusedfor60daysormore,removethe
batteryandstoreseparately.Donotmixbatterytypesorfreshnesslevels;pleaseusebatteries
ofthesametypeandofthesamefreshnesslevel.

Neverdisposeofusedbatteriesorrechargeablebatteriesinhouseholdwaste.
Asconsumers,usersarelegallyrequiredtotakeusedbatteriestoappropriatecollection
sites,theretailstorewherethebatterieswerepurchased,orwhereverbatteriesaresold.
Disposal:Donotdisposeofthisinstrumentinhouseholdwaste.Theuserisobligatedtotakeend‐of‐
lifedevicestoadesignatedcollectionpointforthedisposalofelectricalandelectronicequipment.

CleaningandStorage
Periodicallywipethecasewithadampclothandmilddetergent;donotuseabrasivesorsolvents.
Pleaseremovethebatteriesifthemeterisstoredforalongperiodoftime.

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MA160‐en‐GB_V1.010/15
19
6. Specifications
ELECTRICALSPECIFICATIONS
Accuracyisgivenas±(%ofreading+leastsignificantdigits)at23  C±5  Cwithrelativehumidity
<80%.Accuracyisspecifiedforaperiodofoneyearaftercalibration.

FunctionRangeResolution Accuracy(reading)‘OL’Protection
ACCurrent
200.0A0.1A±(2.5%+5digits)200A
TRMS,FrequencyResponse50to60Hz
DCCurrent
200.0A0.1A±(2.5%+5digits)200A
DCZerofunctioninuse
ACVoltage
6.000V0.001V±(1.2%+5digits)
1000VDC
750VAC
60.00V0.01V
±(1.2%+3digits)
600.0V0.1V
750V1V±(1.5%+5digits)
TrueRMSvoltageapplicableto10%~100%oftherange
InputImpedance:≥10MΩ;Frequencyresponse40~400Hz
DCVoltage
6.000V0.001V
±(0.8%+3digits)
1000VDC
750VAC

60.00V0.01V
600.0V0.1V
1000V1V±(1.0%+5digits)
InputImpedance:≥10MΩ
Resistance
600.0Ω 0.1Ω ±(1.2%+2digits)
1000VDC
750VAC
6.000kΩ 0.001kΩ
±(1.0%+2digits)60.00kΩ 0.01kΩ
600.0kΩ 0.1kΩ
6.000MΩ 0.001MΩ ±(1.2%+2digits)
60.00MΩ 0.01MΩ ±(1.5%+5digits)
Continuity
600.0Ω 0.1Ω ‐‐‐‐‐ 1000VDC;750VAC
Lessthan10Ωbeepersounds.10Ωto100Ωundetermined.Greaterthan100Ω
beeperoff(OLdisplayed).Opencircuitvoltageapprox.1.2V
Diode
6.000V0.001V0.5to0.8V1000VDC;750VAC
OpenCircuitVoltage:Approx.3.3V
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MA160‐en‐GB_V1.010/15
20
FunctionRangeResolutionAccuracy(reading)‘OL’Protection
Capacitance
60.00nF0.01nF
±(4.0%+20digits)
1000VDC
750VAC
600.0nF0.1nF
6.000µF 0.001µF
60.00µF 0.01µF
600.0µF0.1µF
6.000mF0.001mF±(10%)
60.00mF0.01mFForreferenceonly
Non‐Contact
VoltageDetector
(NCV)
≥100Vrms;≤10mm(LED/Buzzerindication)
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