EXTECH EX655 [16/35] Current measurements using the clamp

EX65x‐en‐GB_V1.67/16

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.