EXTECH MG500 [4/15] Features

MG500-en-GB_v1.3 3/17

Features

• Insulation Resistance Testing

This digital insulation resistance tester will measure insulation resistance from 800k ohms to

500G ohms using Dynamic Auto-ranging technology. Test voltages range from 500V to 10kV

in 500 Volt steps. This instrument also employs an Auto-Discharge utility.

• DAR: Dielectric Absorption Ratio Testing

The Dielectric Absorption is the ratio of the Insulation Resistance, measured at 60 seconds,

divided by the Insulation Resistance measured at 30 seconds).

DAR = Resistance measured at 1 minute / Resistance measured at 30 seconds

• PI: Polarization Index Testing

The Polarization Index is the ratio of the Insulation Resistance measured at 10 minutes

divided by the Insulation Resistance measured at 1 minute.

PI = Resistance measured at 10 minutes / Resistance measured at 1 minute

• Automatic Discharge of Capacitive and Inductive Circuits

This instrument will automatically discharge all circuits, charged by the tester, upon

completion of a test. The discharge can be observed on the instrument’s bargraph display.

• Automatic Battery Test

When the instrument is first powered ON, a test circuit applies a heavy current draw on the

batteries for a few seconds and measures the voltage in order to determine the capacity of

the batteries. The result is shown on the display.

• Normal Operation Mode Considerations

This instrument uses Dynamic Current Auto-ranging technology. The bar graph will

display the voltage that is stressing the insulation during the first 30 seconds of a test and

during the discharge of the circuits at the end of the test. The display will also show the

elapsed time from the start of the test and the total time, even after the testing has stopped.

• Supplemental Features

o Insulation Resistance auto-ranging on all Voltage ranges

o Automatic DAR calculation

o Automatic PI calculation

o Ener-Save™ Mode conserves battery energy during Insulation Resistance testing

o Overload protection

o Low battery indicator

o Auto Off feature

o Warning of external voltage presence (>500VAC or VDC)