Extech Instruments MG500 User Manual page 4

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)
Shop for Extech products at:
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