XS series operating manualXS user manual v0.55 - 25 -Measurement thresholdThe megohmmeter function can operate either with one or two measurement threshold(s) between50k up to 200G (2T with option 20 ).A measurement is PASS after comparison between the displayed value and the thresholds.When looking for a value only higher than a limit, the LOW THRESHOLD is used to set the limit andthe HIGH THRESHOLD is not used by setting a value equal to the maximum resistance (basically200G ).When looking for an insulation resistance higher than a limit but not too much high ( which canmeans that the specimen is not correctly connected), then the LOW THRESHOLD is set theminimum insulation value expected and the HIGH THRESHOLD is set to the maximum insulationvalue expected.Setting examples:LOWTHRESHOLDMEASUREDvalueHIGHTHRESHOLDResult10 M 15.4 M 200 G* PASS ( insulation > LOW limit )10 M 9.0 M 100 M FAIL ( insulation < LOW limit)55 M 63.2 M 80 M PASS ( insulation > LOW limit + < HIGH limit)45 M 110 G 75 M FAIL (insulation > HIGH limit )* threshold not activeTimerThe measurement voltage can stay permanently ( timer value set to 0 sec.) or during a timebetween 1 and 999 sec. adjustable by 1 sec. step.Rise and fall times are adjustable in time ( second ) or in voltage increase ( dv/dt) from0.1 to 0.9sec. and from 1 to 999 sec. or in V/s from 1V/s to 1000V/s.1500V megohmmeter function (SXS16)Measurement voltageVoltage adjustable from 500V to 1500VDC by 10 volt step.Accuracy : ±(2% + 20V)Positive pole of the HV generator is grounded (earth)Dynamic stability for a mains ΔV = ±10% : < 1%.The maximum current in the measurement circuit is : 1 mA .The discharge current is limited by a 1.5M resistor.Measurement rangeDisplay : 2000 digits
