TeraOhm 5kV
20
Legend of displayed symbols:
INSULATION RESISTANCE
Name of selected function
SETTING PARAMETERS:
Unominal
1000V
Set test voltage – step 50 V
Timer 10min 00s
Duration of measurement
Timer on/off ON
ON: timer enabled, OFF: timer disabled
Time1 01min 00s
Time to accept and display first Rmin and
Rmax result
Timer and Time1 are independent timers. Maximum time for each of them is
30 min 60 s.
Warning!
• Refer to Warnings chapter for safety precautions!
5.6. Diagnostic test
Selecting this function displays the following states (initial state and state with results
after the completion of the measurement).
Initial display Display with results
Fig. 11. Diagnostic test display states
This is a long duration test for evaluating the quality of the insulation material under test.
The results of this test enable a decision to be made on the preventive replacement of
the insulation material.
POLARIZATION INDEX (PI)
PI is the ratio of Insulation Resistance values measured after 1 minute and after 10
minutes. The DC test voltage is present during the whole period of the measurement
(also Insulation Resistance measurement is running). On completion of the test the PI
ratio is displayed:
()
()
min1
min10
R
iso
iso
PI =
Note: When determining Riso (1min) pay close attention to the capacitance of the object
under test. It has to be charged-up in the first time section (1 min). Approximate
maximum capacitance using:
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