EXTECH EX655 [17/35] Current measurement considerations

EX65x‐en‐GB_V1.67/16

CurrentMeasurementConsiderations:

 Currentmeasurementmustbeperformedinthetemperaturerangeof0~40

C(32to104

F).

 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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