Extech Instruments MG500 Manual

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MG500-EU-EN v1.0 7/13

BargraphVoltageDisplay

Thebargraphrepresentsthevoltagepresentonthetestleadsasitrises,soaks,anddecays.The

bargraphappearsonthelowerleftofthedisplaywindowduringatest.

AutomaticUnder/OverRangeResistanceDetect

Ifthedisplayshowsthemessage“LOWM‐ohms”,thetestshouldbeinterruptedimmediatelyby

pressingtheTESTbutton.Thismessageindicatesthattheinsulationundertesthasbrokendown

andthemeteristryingtoinjectahighpotentialontoashortcircuit.If‘HIGH’appears,itislikely

thatthetestconfigurationisopen.Checkthetestset‐upandthentestagain.

ElapsedTimer

Thetestdurationisindicatedonthedisplay.Thisisparticularlyusefulindeterminingwhetheran

insulatingmaterialundertestwillbreakdowninagivenamountoftime.

ManualTestSTOP

Tostopatestinprogress,presstheTESTbutton.Thetestwillimmediatelyendandthesystem

willautomaticallydischarge.

AutomaticTestSTOP

WheninthedefaultEnersave

mode,thetestautomaticallystopsafterapprox.10seconds.

WhennotintheEnersave

modethetestautomaticallystopsafterapprox.100seconds.

LiveCircuitWarning

Ifthetestleadsareconnectedtoalivecircuit(approx.500V),awarningbeeperwillsoundand

themeterwilldisplay“LiveWarning…CircuitLive…”Inthiscase,correcttheproblemandretest.

AutomaticDischarge

At the end of a test, the meter automatically discharges the high voltage. The automatic

dischargestatusisreflectedonthedisplay.Duringdischargethebeeperwillsoundand,when

completelydischarged,theHOLDiconwillappearonthedisplay.