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The insulating resistance is determined between two electrically separated connections or between the casing and the electrically separated connections. The determination of the resistance is realized with an unconnected device under test (DUT) by a relatively high direct current. Furthermore, relevant quantities for the determination of the insulating resistance can be given, e.g. temperature ( <test-temp>), <test-duration>, relative humidity ( <relative-hum>).
The description of the insulating resistance is valid for all electrical connections (there is no reference to any electrical connection). If there are different descriptions for some electrical connections, a further description of the insulating resistance is defined for each difference (with reference to the concerned connection).
Figure 23: Structure of insulating resistance
Example for content:
Representation example for insulating resistance
Denomination
|
Abbreviation
|
Min
|
Type
|
Max
|
Abs
|
Tol
|
Unit
|
|
Voltage
|
US
|
450
|
500
|
550
|
|
|
V
|
|
Test duration
|
tP
|
0,95
|
1
|
1,05
|
|
|
min
|
|
Temperature
|
TP
|
1,9
|
2
|
2,1
|
|
|
°C
|
|
Resistance
|
R
|
|
1
|
|
|
|
MW
|
|
rel. humidity
|
hum
|
67,5
|
75
|
82,5
|
|
|
%
|
|
Besides the measuring voltage and the resistance, there can always be given additional specifications for each test, e.g. the test set-up.
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