61
6.2.4. RESISTANCE MEASUREMENTS
Particular reference conditions:
External voltage on the terminals: zero.
Measurement range
0.0 - 3.999 k
W
4.00 - 39.99 k
W
40.0 - 399.9 k
W
Resolution
1
W
10
W
100
W
Measurement current
≤
22 µA
≤
22 µA
≤
17 µA
Intrinsic uncertainty
± (1.5% + 5 ct)
± (1.5% + 2 ct)
± (1.5% + 2 ct)
No-load voltage
3.1 V ± 10%
6.2.5. INSULATION RESISTANCE MEASUREMENTS
Particular reference conditions:
Capacitance in parallel: zero.
Maximum acceptable external AC voltage during the measurement: zero.
Frequency of external voltages: DC and 15.8 ... 65 Hz.
The frequency is guaranteed only for a voltage
≥
20 V .
Maximum no-load voltage:
1.1 x U
N
(for U
N
≥
100 V)
Nominal current:
≥
1 mA
Short-circuit current:
≤
3 mA
Intrinsic uncertainty on the measurement of the test voltage: ± (2.5% + 3 ct)
Measurement range at 50 V
0.01 - 7.99
M
W
8.00 - 39.99
M
W
40.0 - 399.9
M
W
400 - 1999 M
W
Measurement range at 100 V
0.01 - 3.99
M
W
4.00 - 39,99
M
W
Measurement range at 250 V
0.01 - 1.99
M
W
2.00 - 39.99
M
W
Measurement range at 500 V
0.01 - 0.99
M
W
1.00 - 39.99
M
W
Measurement range at 1000 V
0.01 - 0.49
M
W
0.50 - 39.99
M
W
Resolution
10 k
W
10 k
W
100 k
W
1 M
W
Intrinsic uncertainty at 50 V
± (5% + 3 ct)
± (2% + 2 ct)
Value given for
guidance
Intrinsic uncertainty at 100 V
± (5% + 3 ct)
± (3% + 3 ct)
Intrinsic uncertainty at the other voltages
± (5% + 3 ct)
± (2% + 2 ct)
Uncertainty of operation at 50 V
± (12% + 3 ct)
± (10% + 2 ct)
Value given for
guidance
Uncertainty of operation at 100 V
± (12% + 3 ct)
± (11% + 2 ct)
Uncertainty of operation at the other voltages
± (12% + 3 ct)
± (10% + 2 ct)
Typical test voltage vs load curve
The voltage developed as a function of the resistance measured has the following form:
I = 1 mA
U
N
R
N
= U
N
/ 1 mA
