Extech Instruments 381676A

381676A-en-GB_V1.1 08/15
6
OperatingInstructions
WARNING:Riskofelectrocution.High‐voltagecircuits,bothACandDC,areverydangerousand
shouldbemeasuredwithgreatcare.
NOTE:OnsomelowACandDCvoltageranges,withthetestleadsnotconnectedtoadevice,
thedisplaymayshowarandom,changingreading.Thisisnormalandiscausedbythehigh‐
inputsensitivity.Readingswillstabilizeandgivepropermeasurementwhentestleadsare
connectedtoacircuit.
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NON‐CONTACTACVOL TAGEDETECTOR(NCV)
WARNING:TesttheACvoltagedetectoronaknownlivecircuitbeforeeachuse.

WARNING:BeforeusingthemeterintheACVoltageDetectormode,verifythatthebatteries
arefreshbyconfirmingcharactersappearontheLCDwhenthefunctiondialisturnedtothe
voltage(V)position.DonotattempttousethemeterasanACVoltageDetectorifthebatteries
areweakorbad.
Notes:
Voltagemaystillexistevenwithnoindicationgivenbythemeter.DonotsolelyrelyonNCV
detectiontodeterminethepresenceofvoltage.Socketdesign,insulationthicknessandother
factorsmayaffectreadings.
TheNCVindicatorLEDmayflashwhilemeasuringAC/DCvoltageduetothepresenceof
induced
voltage.
ExternalenvironmentalinterferencefromadditionalsourcescanfalselytriggerNCVdetection.

1. Disconnectthecommon(negative)testleadfromthebottomofthemeter.
2. WiththefunctionswitchsettoanypositionexceptOFF,pressandholdtheNCVbutton.
3. Movethetipofthemeter
nearthevoltagesourceorconductorasshown.
4. Ifthevoltagedetectedis>110VAC,thebeeperwillsoundandtheNCVindicatornearthe
tipofthemeterwillflash.Alwaystestthedetectoronaknownlivecircuitfirstbefore 
attemptingothertests.
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