73
8.2.6. 3P EARtH REsIstAnCE MEAsUREMEnts
Particular reference conditions:
Resistance of the E lead: zero or compensated.
Interference voltages: zero.
Inductance in series with the resistance: zero.
(R
H
+ R
S
) / R
E
< 300 and R
E
< 100 x R
H
with R
H
and R
S
≤
15,00 k
W
.
Compensation of the lead R
E
up to 2.5
W
.
Measurement range
0.50 - 39.99
W
40.0 - 399.9
W
400 - 3999
W
0.20 - 15.00 k
W
1
Resolution
0.01
W
0.1
W
1
W
10
W
Intrinsic uncertainty
± (2% + 5 ct)
± (2% + 2 ct)
± (10% + 2 ct)
Operating uncertainty
± (9% + 20 ct)
± (9% + 5 ct)
-
Typical peak-to-peak measure-
ment current
2
4.3 mA
4.2 mA
3.5 mA
-
Measurement frequency
128 Hz
No-load voltage
38.5 V peak-to-peak
1: the 40 k
W
display range is used only for measurements of the R
H
and R
S
rods.
2: current at mid-range with R
H
= 1000
W
.
Maximum acceptable interference voltage:
25 V on H from 50 to 500 Hz.
25 V on S from 50 to 500 Hz.
Accuracy on the measurement of the interference voltages:
Characteristics the same as for the voltage measurements.
8.2.7. looP IMPEDAnCE MEAsUREMEnts
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.
Residual leakage current of the installation: zero.
Compensation of the leads up to 5
W
.
Characteristics in 3-wire mode with tripping:
Measurement range
0.080 - 0.500
W
0.510 - 3.999
W
4.00 - 39.99
W
40.0 - 399.9
W
Resolution
0.001
W
0.001
W
0.01
W
0.1
W
Intrinsic uncertainty on the impedance measure-
ment
± (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
3
± (10% + 2 ct)
± (5% + 2 ct)
-
Operating uncertainty on the impedance meas-
urement
± (17% + 20 ct)
± (12% + 20 ct)
± (12% + 2 ct)
Frequency of operation
15.8 … 17.5 and 45 … 65 Hz
3: 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).
Summary of Contents for C.A 6116
Page 1: ...C A6116 Installation TESTER E N G L I S H User s manual...
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