To Next Page

To Previous Page



Principle of Insulation Resistance Measurement

Aresistancevaluecanbeobtainedbyapplyingacertainhigh

voltagetotheresistor(insulationresistance)andmeasuringthe

flowingcurrent.

Resistancevalue=Voltage/Current

(RX=V/I)

6-3 Continuous Measurement

PressandturntheTestbuttonclockwiseandlockthebutton

to measure insulation resistances continuously. Turn the

buttoncounterclockwiseandsetittotheinitialpositionaftera

measurement.

#DANGER

●Be extremely careful not to get electric shock as a high

voltageispresentonthetipofthetestleadscontinuously.

●Keep your fingers and hands behind the protective

fingerguardduringmeasurement.

6-4 DAR/PI measurement

1. PI - Polarization index

This is to check a temporal increase of leakage currents

flowingoninsulationsandtoconfirmleakagecurrentsarent

increasedastimepasses.

PI is usually determined by the insulation resistances

measured1minand10minafterameasurementisstarted.

PI is dependent on the shape of insulations and influenced

bymoistureabsorption,therefore,acheckofPIisimportant

KYORITSU KEW3125A User Manual

Questions and Answers: