Extech Instruments EX650

EX65x‐en‐GB_V1.67/16
16
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.