EXTECH EX380396 [8/17] Polarization index pi

380395/380396 -EU-EN-V1.2-4/12

Timed Insulation Test

The timed insulation test feature allows the user to specify the period of time the test will run. The

run time can be set from 1 to 15 minutes in 1 minute increments.

1. Connect the Black Earth test lead to the Earth connector and the Red test lead to the LINE and

COM connectors.

2. Connect the test leads to the device under test.

3. Set the Function Selector switch to the desired insulation test voltage.

4. Use the Time Set ▲ and ▼ arrow buttons to select the desired run time for the insulation test.

The selected time will be shown in the lower left corner of the LCD.

5. Press and hold the PRESS TO TEST knob (or lock it). The beeper will sound and the voltage

warning icon will flash at one second intervals during the test.

6. At the end of the timed period, keep the test leads connected the meter will

the device and the results will be held in the display

7. Release or unlock the PRESS TO TEST knob and press the STOP button to clear the display.

8. Set the Function Selector switch to the OFF position and remove the test leads from the circuit.

Polarization Index (PI)

The polarization index Test calculates the ratio of the resistance measurement after 10 minutes to

the resistance measurement after 1 minute: Results are determined by the type, age and condition

of the insulation material tested. Established standards and test procedures should be used to

establish pass/fail criteria for each application.

Polarization Index = Resistance after 10 minutes / Resistance after 1 minute

1. Connect the Black Earth test lead to the Earth connector and the Red test lead to the LINE and

COM connectors.

2. Connect the test leads to the device under test.

3. Set the Function Selector switch to the desired insulation test voltage.

4. Use the PI/DAR button to select TIME 1 (1:00) for the Polarization Index (PI) function.

5. Press and hold the PRESS TO TEST button and turn it clockwise to the LOCK position. The

beeper will sound during the test.

6. When the test has completed, the LCD will display PASS if the Polarization Index is greater

than 1. FAIL will be displayed if the Polarization Index is below 1.

7. Keep the test leads connected to the equipment under test and release the PRESS TO TEST

button. The circuit will discharge through the meter. While the circuit is discharging, the

icon will flash.

8. Press the STOP button to clear the results