EXTECH MG500 [8/15] Dar and pi tests dar dielectric absorption ratio and pi polarization index

MG500-en-GB_v1.3 3/17

The Enersave

Mode

Enersave

mode conserves battery life by performing a relatively short test. The Enersave

mode is the default test mode. To bypass this mode and run a longer test (10 minutes) press and

hold the TEST button for more than 3 seconds when starting a test.

DAR and PI Tests (DAR: Dielectric Absorption Ratio) and (PI: Polarization Index)

Warning: The circuit under test must be completely de-energized and isolated before making

test connections.

1. After turning the unit on, make sure that the Replace Battery message is not displayed. If

the Replace Battery message is displayed replace the batteries before proceeding.

2. The test voltage defaults to 2500V on power up. Select the desired test voltage using the

Voltage Adjust buttons (±500V) that step through the available test voltages in 500V

increments or by pressing one of the preset test voltage buttons (10kV, 5kV, 2.5kV, 1Kv).

3. The display shows the Connect Leads prompt along with the selected test voltage value.

Connect the Green test lead to the Green test socket on the meter and then to the Ground

side of the insulator under test.

Connect the Red lead to the Red test socket on the meter and the Blue guard cable to the

blue socket on the meter. Connect the service end of the Red cable to other side of the

insulator under test.

If a Leakage Guard lead is required to collect surface leakage, connect the separate Blue test

lead into the Blue guard lead from the Red test lead which is plugged into the Blue test

socket on the meter and then clip the service end of the cable to the surface of the

insulator under test.

4. Press and hold the Test Start/Stop button for more than 3 seconds to the initiate DAR/PI

testing mode.

5. After 1 minute, the elapsed test timer appears on the upper line (right hand side) of the

display. The resistance reading is shown on the upper left hand side of the display. The lower

line shows the test voltage and the DAR value.

6. After 10 minutes, the test completes. The display will show the results:

R = (resistance or OVER R for over range)

T = Hold, T = 10:00, V = (test voltage)

PI = (PI value)

DAR = (DAR value)

7. To take another test, press the TEST START/STOP button, the Connect Leads prompt should

appear on the display; the instrument is now ready to run a new test.