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Operation
Testing Procedures
Insulation Resistance Testing (R)
This test mode measures insulation resistance continuously at the
selected voltage. The highest digital readings obtainable are
500 GΩ at 500 V and 5 TΩ at 5000 V, above which the specified
accuracy can be expected to decline. However, the analogue
indicator display functions to 1TΩ at all voltages.
1.
Using the
Range keys move the right hand cursor to 'R'.
2.
Accept the default time of 30 minutes, or using the
Selector keys move the left hand cursor to the
and then set the test duration using the
keys.Maximum test time is 90 minutes.
3.
Using the
Selector keys move the left hand cursor to the
required test voltage.
4.
Start the test by pressing the red test button for at least one
second.
5.
On completion, the final resistance measurement is
displayed sequentially with the corresponding leakage
current and the capacitance value, where available. This
sequential display repeats until a key is pressed or Auto
switch-off operates. For more details of final display
information see Appendix 1.
Test Current measurement (I)
This test mode measures insulation continuously at the selected
voltage, but displays leakage current value instead of resistance.
This enables even higher resistances to be calculated. Using this
method it is theoretically possible to measure resistance up to
10
500 TΩ at 5000 V but it will be necessary to perform an open
circuit calibration test to establish measurement circuit offset
current and test lead leakage. (This is ±0,2 nA at normal
temperatures with new, clean test leads).
1.
Using the
and follow the same procedure as for Insulation Test 'R'.
2.
On completion, the final current leakage measurement is
displayed sequentially with the resistance and the
capacitance value, where available. This sequential display
repeats until a key is pressed or Auto switch-off operates. For
more details of final display information see Appendix 1.
position
Polarization Index Testing (PI)
Range
Polarization Index is the term applied to the Dielectric Absorption
ratio, when the insulator is subjected to an insulation resistance
test, and the resistance values are measured after time T1
(Default 1 minute) and again after time T2 (Default 10 minutes).
The test will run at any voltage. Polarization Index is therefore
the resistance value after time T2 divided by the resistance value
after time T1.
1. Using the
2. Using the
required test voltage.
3.
Start the test by pressing the red test button for at least one
second.
On completion, the PI ratio is displayed sequentially
4.
followed by the corresponding 1 minute and 10 minute
resistance values, and where available, the capacitance
value. In lieu of a custom timed T3 value, the display will
Range keys move the right hand cursor to 'I',
Range keys move the right hand cursor to PI.
Selector keys move the left hand cursor to the
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