EXTECH MG500 [9/15] Automatic discharge

MG500-en-GB_v1.3 3/17

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 in 5 seconds. When not in

the Enersave

mode the test automatically stops after approx. 10 minutes.

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.