EXTECH EX650 [21/35] Resistance measurement notes

EX65x‐en‐GB_V1.67/16

ResistanceMeasurementNotes:

 Thedisplaywillshow“OL”whenanopencircuitisdetectedoriftheresistance>maximum

range.

 Thetestleadsintroduceanerrorofapprox.0.1Ω～0.2Ωforlowresistancemeasurements.

UsetheRelativemodetoobtainaccuratereadings.Shortthetestleadstogether,pressthe

RELbutton,andthenmeasurealowresistance.Themetersubtractstheshort‐circuitvalue

fromthereading.

 Ifthetestleadresistanceofprobeis>0.5Ωwhenshorted,inspectthetestleadsandthe

connection.

 Itmaytakeseveralsecondsforthereadingtostabilizewhenmeasuring

resistance>1MΩ.

Thisisnormaloperation.

 Forpersonalsafety,donotmeasureacircuitwithvoltages>30VDCorAC.

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