Extech Instruments EX650 User manual

USERGUIDE
600ATrueRMSDigitalClampMeters
EX650Series

EX650TrueRMS600AACDigitalClampMeter
EX655TrueRMS600AAC/DCClampMeterwithTemperature,
Inrush,andLowPassFilter
 
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TableofContents
1.INTRODUCTION3
2.SAFETYINFORMATION4
3.DESCRIPTIONS6
4.OPERATION11
PoweringtheMeter11
DisableAutoPowerOFF11
DisplayBacklight11
WorkLight11
DataHold12
TestLeadConsiderations12
VoltageMeasurements12
‘LoZ’ACVoltageMeasurements15
CurrentMeasurementsUsingtheClamp16
µAAC/DCCurrentMeasurementsusingTestLeads18
Non‐ContactVoltageDetector19
ResistanceMeasurements20
ContinuityMeasurements22
CapacitanceMeasurements23
FrequencyMeasurements(EX655)25
DiodeTest26
TemperatureMeasurements(EX655only)27
ExtendedFunctionalityModes28
InrushCurrentMode(EX655only)28
DCAZERO(EX655only)29
MAX‐MINMode29
LowPassFilter(LPF)EX655only30
Relative Mode30
5.MAINTENANCE31
6.SPECIFICATIONS32

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1. Introduction
ThankyouforselectingtheExtechEX650SeriesClampMeter.

TheEX650isafeature‐packedTrueRMSdigitalClampmeterserieswith6000countbacklit
displayandautomaticranging.

MeasureAC/DCvoltage,ACcurrent,DCcurrent(EX655),Inrushcurrent(EX655),Resistance,
Diode,Continuity,Capacitance,Temperature(EX655),Lo‘Z’lowimpedancemode,and
Frequency(EX655).

OtherfunctionsincludeDataHold,Maximum/MinimumMemory,Relativemode,LowPassFilter
(LPF)forVariableFrequencyDrivesignals(EX655),Worklight,NCV(Non‐ContactVolt
Detection),andAutopower‐off.

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
60segmentanalogbargraphdisplayonEX655model
LargebacklitLEDdisplay
TrueRMSACmeasurements
LoZmodeeliminatesghostvoltagereadingsonnon‐energizedcircuits
AutoandManualRangemodes
0.5%DCVaccuracy
DataHold
InrushcurrentmodeonEX655model
Relativemode
AutoPowerOFF(APO)withdisablefunction
Temperaturemeasurements(ModelEX655only)withincludedtemperatureprobe
600AACcurrentmeasurements
600ADCCurrentMeasurementsonEX655model
Non‐ContactVoltageDetector
Visualandaudiblecontinuitymeasurementalert
Lowbatteryindicator
Includestestleads,Type‐Ktemperatureprobe(EX655),andthree(3)1.5VAAAbatteries.
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750V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
Fusesymbol
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

UnsafeVoltageAlert
Whenthemeterdetectsavoltageequaltoorgreaterthan30Voravoltageoverload(OL)inVorLoZmode,
thesymbolisdisplayed.Thissystemwasdesignedtoalerttheuserofapotentiallyhazardousvoltage.
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(EX655pictured)
1. Non‐ContactVoltageDetector
2. Clampjaw
3. WorkLightON/OFFbutton
4. NCValertLEDlamp
5. Rotaryfunctionswitch
6. Max‐Minbutton
7. Relative,DCAZero,andInrushbutton(DCAZero&InrushonEX655only)
8. LCDmulti‐functiondisplaywithbacklighting
9. Positiveinputterminal
10. Common(‐)inputterminal
11. Mode(M)andLPF(lowpassfilter)button(LPFonEX655only)
12. BacklightandHoldbutton
13. JawTrigger
14. WorkLight
Note:Batterycompartmentonbackofmeter
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Fig3‐1METERDESCRIPTION

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DisplayIconDescriptionsforEX650
1234 5 6
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Fig3‐2EX650METERDISPLAY
1. Highvoltage
2. Batterystatus
3. Relativemode
4. Autopoweroff
5. Datahold
6. Unitsofmeasure
7. DirectCurrent
8. AlternatingCurrent
9. Diode
10. Continuity
11. Automaticrange
12. LowImpedancemode(LoZ)
13. MaximumandMinimummemory
14. Non‐ContactVoltageDetector
15. LowPassFilter(LPF)
16. Temperatureunits
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DisplayIconDescriptionsforEX655

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Fig3‐3EX655METERDISPLAY
1. Highvoltage
2. Batterystatus
3. Relativemode
4. Autopoweroff
5. Datahold
6. Unitsofmeasure
7. DirectCurrent
8. AlternatingCurrent
9. Diode
10. Continuity
11. Automaticrange
12. LowImpedancemode(LoZ)
13. InrushCurrent(Surge)
14. MaximumandMinimummemory
15. Non‐ContactVoltageDetector
16. LowPassFilter(LPF)
17. Temperatureunits
18. Bargraph

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Push‐ButtonDescriptions
MomentarypressesoftheM(MODE)buttonperformthefunctionsshowninthe
tablebelow.Pressandholdthebuttontoactivate/deactivatetheLowPassFilter
(EX655only).
Fig.3‐4(a)EX655MODEButtonFunctionTable
SwitchPositionMODE(M)ButtonFunction

ACHzDC
or 
AC DC
Ω   
TEMPoC oF
Fig.3‐4(b)EX650MODE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DCvoltage,ACCurrent,Resistance,andCapacitance.
InDCMode,presstozerothedisplay(EX655only)
WhentheEX655isintheACAmode,pressandholdtoaccesstheInrushmode.

PresstoaccesstheMIN/MAXmode.TheMAXiconwillappearalongwiththe
storedhighestreading.Pressagaintoviewtheminimumreadingstored(MINicon
displayed).Continuetousethebuttoninthismannerasdesired.Pressandhold
thebuttontoexittheMIN/MAXmode.ThismodeofoperationisonlyavailableforAC/DC
Voltage/Current,Resistance,andTemperature.
Pressandholdthisbuttontoactivate/deactivatetheDataHoldfunction.Momentary
pressesswitchthedisplaybacklightONorOFF.

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Fig3‐5(a)‐FunctionSwitchDescription(EX655)
1. LowImpedancemodeforACVoltage
measurements
2. MeterPOWEROFFposition
3. AC/DCVoltageandHzforACV(useMODE
buttontochooseAC,Hz,orDC)
4. Frequencymode
5. Capacitance,Continuity,Diode,
Resistancemodes(useMODEbuttonto
choosemode)
6. Temperaturemode
7. 600µAAC/DCCurrentmode(useMODE
buttontochooseACorDC)
8. AC/DC600ACurrentmode(useMODE
buttontochooseACorDC)
9. Non‐ContactVoltageDetectpositionwith
alertLED

Fig3‐5(b)‐FunctionSwitchDescription(EX650)
1. LowImpedancemodeforACVoltage
measurements
2. MeterPOWEROFFposition
3. AC/DCVoltage(useMODEbuttonto
chooseACorDC)
4. Capacitance,Continuity,Diode,Resistance
modes(useMODEbuttontochoose
mode)
5. 600µAAC/DCCurrentmode(useMODE
buttontochooseACorDC)
6. 6AACCurrentmode
7. 60AACCurrentmode
8. 600AACCurrentmode
9. Non‐ContactVoltageDetectpositionwith
alertLED
1
2
3
4
5
6
7
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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information.
2. TurnthefunctionswitchtotheOFFpositiontopowerOFFthemeter.
3. ThemeterhasanAutoPowerOFFsleepfeature(APO)wherethemeterenterssleepmode
after15minutesofinactivity.PresstheModebuttontoawakenthemeter.WhenAPOis
enabled,theAPOiconwillshowonthedisplaywhenthemeterispoweredON.Todisable
APO,refertothenextsection.
Thelowbatterysymbolappearsonthedisplaywhenthebatteryvoltageweakensbelowthe
threshold.
DisableAutoPowerOFF
Themeterwillentersleepmodeafter15minutesofinactivity.PresstheModebuttontoawaken
themeter.Todefeatthisfeature,followthestepsbelow.
1. WiththemeterOFF,pressandholdtheM(MODE)buttonand,whilecontinuingtohold,turn
therotaryfunctionswitchtoanypositiontopowerONthemeter.
2. TheEX650willbeepfivetimesindicatingthatAPOhasbeendisabled.TheEX655willbeep
twotimesindicatingthatAPOhasbeendisabled.
3. Releasethebutton.
4. APOwillnowbedisableduntilthenextcycleofpower.
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andhold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.

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DataHold
TofreezetheLCDmeterreading,presstheH(HOLD)button.Whiledataholdisactive,theHOLD
displayiconappearsontheLCD.PresstheHbuttontoreturntonormaloperation.TheHOLD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orCATIV600Vinstallations.Donotmeasurevoltages>1000VACorDC.
Removethestoragecapsfromthemeterendoftestleadsbeforeconnectingleadstothemeter.
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750VAC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.
Themeterdisplaysahighvoltagewarningprompt“ ”whenthevoltagemeasuredis>30VAC.
Theinstrumentwillautomaticallybeepandshowthehighvoltagewarningpromptflashingifthe
voltageinputexceeds750VACor1000VDC.
Notes:
ACmeasurementsincorporatetrueRMSACcoupling.Theaccuracyofnon‐sinusoidalwaves
mustbeadjustedasfollows:
Crestfactor1~2,accuracyincreasesby3%
Crestfactor2~2.5,accuracyincreasesby5%
Crestfactor2.5~3,accuracyincreasesby7%
Inordertoobtainaccuratereadingsinthemeasurementof600mV,usetherelative
measurementmode.Firstshort‐circuittheprobeinputin,ordertozerothereading,andthen
presstheRELbutton;nowreadthevoltagemeasured.Theinstrumentautomaticallysubtracts
theshort‐circuitdisplayvalueoftheprobefromthereading.

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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(MODE)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andthe60‐segmentbargraph(EX655only)onthedisplay.The
meterisAutoRanging(AutodisplayedonLCD)andthereforeselectstheproperdecimal
pointposition.Themeteralsodisplaysthemeasurementtype,unitsymbols,andother
relevantmultifunctionicons.
6. UsetheMbuttontoviewthefrequency(Hz)ofthemeasuredvoltage(EX655only).
Importantnote:Waituntilthemeterissetupandactivelymeasuringthevoltagesignal
beforeaccessingtheHzmeasurementmode.
7. Notethevoltagealertsymbol whenvoltageispresent.
8. ThemeteriscapableofdetectingACvoltagesto750V.
9. ForEX655only:PressandholdtheLPFbuttontoengagetheLowPassFiltercircuit(the
LPFiconwilldisplay).PressandholdLPFagaintoexitthismode.SeetheLowPassFilter
sectionformoredetails.
10. SetthefunctionswitchtotheLoZpositiontoengagethelowimpedancecircuit(the
impedancewillnowbeapproximately3kΩ).SeethededicatedLoZsectionofthisguide.
AC Hz
EX655

Fig4‐1ACVOLTAGEMEASUREMENTS

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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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andthebargraphrepresentation(EX655)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. Notethevoltagealertsymbol whenvoltageispresent.
8. ThemeteriscapableofdetectingDCvoltagesto1000V.
AC DC

Fig4‐2DCVOLTAGEMEASUREMENTS

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‘LoZ’ACVoltageMeasurements
Thenormalhighinputimpedance(voltagemeasurement position)wouldtypicallybeused
forallACvoltagetests.However,ifavoltageonanon‐energizedlineisdetectedusetheLoZ
settingtodetermineifthevoltageisreallythereorisitaghostvoltage.
WhenthefunctionswitchisturnedtotheLoZpositionalowimpedance(Z)testcircuitis
engagedthateliminatesghostvoltagesonnon‐energizedlines.RefertotheVoltage
MeasurementssectionearlierinthisguideforSafetyinformationandconnectiondiagrams.
*TheLoZimpedanceisapprox.3kΩ.
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LoZposition.
3. TouchthetestprobetipstotheACcircuitundertest.Besuretoobservethecorrect
polarity(redleadtopositive,blackleadtonegative).
4. Readthedigitalvalueandthe60‐segmentbargraphrepresentationofthemeasurement
(EX655)inthedisplay.Thedisplaywillalsoindicatetheproperdecimalpointand
measurementtype/unitssymbols.
5. ThemeteriscapableofdetectingACvoltagesto600VinLoZmode.Notethevoltage
alertsymbolwhenvoltageispresent.

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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fortheEX655ortothe6,60,or600positionsonthe
EX650.
3. UsetheMbuttontoselectACorDC.ForDC(EX655),pressZEROtoremoveanyresidual
magnetismandtonullthedisplaybeforeclampingontoaconductor.
4. Pressthetriggertoopentheclampjaws.Fullyencloseonlyoneconductorinthejaws
(RefertoFig.4‐3).Foroptimumresults,centertheconductorinthejaws.
5. Readthecurrentmeasurementinthedisplayrepresentedbynumericaldigits(andthe60‐
segmentbargraphontheEX655).Thedisplaywillindicatetheproperdecimalpointand
value.InDC(EX655),whenthepolarityisreversed,thedisplaywillshow(‐)minusbefore
thevalue.
6. PressandholdtheMbuttontoengagetheLPF(LowPassFilter)circuit(tomeasure
inverters,VFD,etc.).RefertothededicatedsectiononLowPassFiltering.
7. PressandholdtheINRUSHbuttontoactivatetheInrushCurrentutility(EX655only).
RefertothededicatedInrushCurrentsectioninthisUserGuide.

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CurrentMeasurementConsiderations:
Currentmeasurementmustbeperformedinthetemperaturerangeof0~40oC(32to104oF).
Whenpressingthetrigger,donotsuddenlyreleaseit;theclampissensitivetomagnetism,
heat,andmechanicalstressandsuchimpactwillcausethereadingtofluctuatebriefly.
IfthereadingispositiveinthemeasurementofDCcurrent,thedirectionofcurrentisfrom
toptobottom(meterfaceplateisthetopandthemeterbackisthebottom).
Inordertoensuremeasurementaccuracy,theconductormeasuredmustbepositionedin
themiddleoftheclampingarea;otherwiseadditionalerrorofreadingof±1.0%(typical)will
begenerated.
Theaccuracyofnon‐sinusoidalwavesmustbeadjustedasfollows:
Crestfactor1~2,accuracyincreasesby3%
Crestfactor2~2.5,accuracyincreasesby5%
Crestfactor2.5~3,accuracyincreasesby7%


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18
µAAC/DCCurrentMeasurementsusingTestLeads
WARNING:Donothandlethetestleadsabovethefinger/handguardbarrier.
CAUTION:ObserveCATII1000VandCATIII600VwithrespecttoEarthGround.
1. InserttheblacktestleadintotheCOMterminalandtheredtestleadintotheAterminal.
2. Turnthemeter’sfunctionswitchtothe position.TheµAunitsymbolwillappearonthe
displayindicatingthatmicro‐amperesarebeingmeasured.
3. ThemeterdisplaywillshowACorDC(usetheMbuttontoselectACorDC).
4. Currentmeasurementsmustbetakeninserieswiththecircuitundertest.Seeaccompanying
diagram.
5. Touchtheblacktestleadtothenegativesideofthecircuitandtheredtestleadtothe
positivesideofthecircuit.
6. Readthecurrentmeasurementinthedisplayrepresentedbythenumericaldigitsandthebar
graph(EX655).Thedisplaywillindicatetheproperdecimalpointandvalue.InDC,Ifthe
polarityisreversed,thedisplaywillshow(‐)minusbeforethevalue.
AC DC

Fig4‐4µAAC/DCCURRENTMEASUREMENTS

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19
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attheNCVfunctionswitchposition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4‐5NON‐CONTACTVOLTAGEDETECTOR

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20
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4‐6RESISTANCEMEASUREMENTS

