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GMC-I Messtechnik GmbH 27
Display Values in Consideration of Measuring Uncertainty
Table for determining minimum display values for insulation resis-
tance in consideration of the instrument’s measuring uncertainty.
Table for determining maximum display values for low-value resis-
tance in consideration of the instrument’s measuring uncertainty.
Voltage at Device Under Test During Insulation Resistance
Measurement
Measuring voltage U
x
at the device under test depending upon its
resistance R
x
at nominal voltage U
N
= 100, 250, 500 and 1000 V:
Limit Value
Minimum
Display Value
Limit Value
Minimum
Display Value
020 kΩ 025 kΩ
100 kΩ 111 kΩ 100 MΩ 111 MΩ
200 kΩ 219 kΩ 200 MΩ 219 MΩ
500 kΩ 541 kΩ 500 MΩ 541 MΩ
0.20 MΩ 0.25 MΩ
0.50 MΩ 0.57 MΩ
1.00 MΩ 1.11 MΩ 1.00 GΩ 1.11 GΩ
2.00 MΩ 2.19 MΩ 2.00 GΩ 2.19 GΩ
5.00 MΩ 5.41 MΩ 5.00 GΩ 5.41 GΩ
10.0 MΩ 11.1 MΩ 10.0 GΩ 11.1GΩ
20.0 MΩ 21.9 MΩ 20.0 GΩ 22.6 GΩ
50.0 MΩ 54.1 MΩ 50.0 GΩ 55.9 GΩ
Limit Value
Maximum
Display Value
Limit Value
Maximum
Display Value
0.15 Ω 0.11 Ω
0.20
Ω 0.16 Ω 5.00 Ω 4.72 Ω
0.50 Ω 0.44 Ω 10.0 Ω 9.47 Ω
1.00 Ω 0.92 Ω 20.0 Ω 17.7 Ω
2.00 Ω 1.87 Ω 50.0 Ω 44.7 Ω
100
U
x
/V
R
x
/kΩ
U
N
= 100 V
0
20
40
60
80
100
250
U
x
/V
R
x
/kΩ
U
N
= 250V
0
50
100
150
200
250
27


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