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 k
Ω
025 k
Ω
100 k
Ω
111 k
Ω
100 M
Ω
111 M
Ω
200 k
Ω
219 k
Ω
200 M
Ω
219 M
Ω
500 k
Ω
541 k
Ω
500 M
Ω
541 M
Ω
0.20 M
Ω
0.25 M
Ω
0.50 M
Ω
0.57 M
Ω
1.00 M
Ω
1.11 M
Ω
1.00 G
Ω
1.11 G
Ω
2.00 M
Ω
2.19 M
Ω
2.00 G
Ω
2.19 G
Ω
5.00 M
Ω
5.41 M
Ω
5.00 G
Ω
5.41 G
Ω
10.0 M
Ω
11.1 M
Ω
10.0 G
Ω
11.1G
Ω
20.0 M
Ω
21.9 M
Ω
20.0 G
Ω
22.6 G
Ω
50.0 M
Ω
54.1 M
Ω
50.0 G
Ω
55.9 G
Ω
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
/k
Ω
U
N
= 100 V
0
20
40
60
80
100
250
U
x
/V
R
x
/k
Ω
U
N
= 250V
0
50
100
150
200
250
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