65
Calculation of the fault voltage if there is a short-circuit, U
Fk
:
Measurement range
0.2 - 399.9 V
400 - 550 V
Resolution
0.1 V
1 V
Intrinsic uncertainty
=
√
(Intrinsic uncertainty on the voltage measurement if U
MEAS
is used)²
+ (Intrinsic uncertainty on the loop measurement)²
Operating frequency
15.8 to 70 Hz
Characteristics in non-tripping mode:
Measurement range
0.20 - 1.99
W
2.00 - 39.99
W
40.0 - 399.9
W
400 - 3999
W
Resolution
0.01
W
0.1
W
1
W
RMS measurement current
choice of 6. 9. or 12 mA
Intrinsic uncertainty on the im-
pedance measurement
7
± (15% + 3 ct)
± (5% + 3 ct)
± (5% + 2 ct)
± (5% + 2 ct)
Intrinsic uncertainty on the
resistive part
± (15% + 3 ct)
± (10% + 3 ct)
± (5% + 2 ct)
± (5% + 2 ct)
Intrinsic uncertainty on the
inductive part
± (15% + 3 ct)
± (10% + 3 ct)
± (5% + 2 ct)
± (5% + 2 ct)
Operating uncertainty on the
impedance measurement
± (20% + 3 ct)
± (12% + 3 ct)
± (12% + 2 ct)
± (5% + 2 ct)
7: There is no measurement of the inductive in L-PE loop part with a low current.
The intrinsic uncertainty is defined for 0,1
≤
R
L
/ R
N
≤
10 with R
L
and R
N
≥
1
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 becomes
±2.5 digits) and the duration of the measurement is of the order of 30 s.
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
.
Characteristics in selective mode:
Measurement range
0.50 - 39.99
W
40.0 - 399.9
W
Resolution
0.01
W
0.1
W
Intrinsic uncertainty on the re-
sistance measurement
8
± (10% + 10 ct)
8: there is no measurement of the inductive part in selective mode.
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).
Maximum acceptable resistance of the voltage probe: 15 k
W
.
Accuracy on the probe resistance measurement: ± (10% + 5 digits), resolution 0.1 k
W
.
The measurement current corresponds to the test current indicated in the table of characteristics in tripping mode divided by the
ratio R
SEL
/R
A
avec R
SEL
/R
A
≤
100. Beyond this, the maximum current, 20 mA peak, is reached.
