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EX65x‐en‐GB_V1.67/16

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.

Extech Instruments EX655 User Manual

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