Fluke 1507 [22/38] Measuring polarization index and dielectric absorption ratios model 1507

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1507/1503

Users Manual

INSULATION TESTER

1507

bbw05f.eps

Figure 7. Measuring Insulation Resistance

Measuring Polarization Index and

Dielectric Absorption Ratios (Model

1507)

Polarization Index (PI) is the ratio of the 10-minute

insulation resistance to the 1 minute insulation resistance.

Dielectric Absorption Ratio (DAR) is the ratio of the

1-minute insulation resistance to the 30 second insulation

resistance.

Insulation tests should only be performed on de-energized

circuits. To measure the polarization index or dielectric

absorption ratio:

1. Insert test probes in the INSULATION and COM input

terminals.

Note

Because of the time required to perform the PI

and DAR tests, use of test clips is recommended.

2. Turn the rotary switch to the desired test voltage

position.

3. Press the E button to select polarization index or

dielectric absorption ratio.

4. Connect the probes to the circuit to be measured. The

Tester automatically detects if the circuit is energized.