64
Compensation of the leads up to 5
W
.
Characteristics in 2-wire mode:
Measurement range
0.080 - 0.500
W
0.510 - 3.999
W
4.00 - 19.99
W
20.0 - 39.99
W
40.0 - 399.9
W
400 - 3999
W
Resolution
0.001
W
0.001
W
0.01
W
0.1
W
1
W
Intrinsic uncertainty on the im-
pedance measurement
± (10% + 20 ct)
± (5% + 20 ct)
± (5% + 2 ct)
Intrinsic uncertainty on the
resistive part
± (10% + 20 ct)
± (5% + 20 ct)
± (5% + 2 ct)
Intrinsic uncertainty on the
inductive part
5
± (10% + 2 ct)
± (5% + 2 ct)
-
Operating uncertainty on the
impedance measurement
± (17% + 20 ct)
± (12% + 20 ct)
± (12% + 2 ct)
Frequency of operation
15.8 … 17.5 and 45 … 65 Hz
5: the inductive part is displayed only when the impedance is
≤
30
W
.
The duration of the measurement depends on the voltage of the installation, on the measured impedance value, and on the activa-
tion of the smoothing filter (SMOOTH).
If smoothing is activated (SMOOTH mode), the instability of the intrinsic uncertainty is then halved (for example: ±5 digits be-
comes ±2.5 digits).
6.2.9. EARTH MEASUREMENTS ON LIVE CIRCUITS
Particular reference conditions:
Voltage of the installation: 90 to 500 V.
Stability of the voltage source: <0.05%.
Frequency of the installation: 15.8 to 17.5 Hz and 45 to 65 Hz.
Resistance of the leads: zero or compensated.
Contact voltage (potential of the protective conductor with respect to the local earth): <5 V.
Resistance of the voltage measurement probe:
≤
15 k
W
.
Potential of the voltage probe with respect to the PE:
≤
U
L
.
Residual leakage current of the installation: zero.
Compensation of the leads up to 2,5
W
per lead.
Characteristics in tripping mode:
Measurement range
0.080 - 0.500
W
0.510 - 3.999
W
4.00 - 19.99
W
20.0 - 39.99
W
40.0 - 399.9
W
400 - 3999
W
Resolution
0.001
W
0.001
W
0.01
W
0.1
W
1
W
Intrinsic uncertainty on the im-
pedance measurement
± (10% + 20 ct)
± (5% + 20 ct)
± (5% + 2 ct)
Intrinsic uncertainty on the
resistive part
± (10% + 20 ct)
± (5% + 20 ct)
± (5% + 2 ct)
Intrinsic uncertainty on the
inductive part
6
± (10% + 2 ct)
± (5% + 2 ct)
-
Operating uncertainty on the
impedance measurement
± (17% + 20 ct)
± (12% + 20 ct)
± (12% + 2 ct)
Frequency of operation
15.8 … 17.5 and 45 … 65 Hz
6: the inductive part is displayed only when the impedance is
≤
30
W
.
The duration of the measurement depends on the voltage of the installation, on the measured impedance value, and on the activa-
tion of the smoothing filter (SMOOTH).
If smoothing is activated (SMOOTH mode), the instability of the intrinsic uncertainty is then halved (for example: ±5 digits be-
comes ±2.5 digits).
Maximum acceptable resistance of the voltage probe: 15 k
W
.
Intrinsic uncertainty on the probe resistance measurement: ± (10% + 5 digits), resolution 0.1 k
W
.
Maximum acceptable inductance for the measurement: 15 mH, resolution 0.1 mH.
