Extech Instruments EX650 - Page 21

EX65x‐en‐GB_V1.67/16
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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.
