MI 3152(H)
Eurotest
XC (2,5 kV)
Technical specifications
185
12.16
Earth 2 clamp – Contactless earthing resistance
measurement (with two current clamps)
Re
– Earth resistance
Measuring range (
)
Resolution (
)
Accuracy
*)
0.00 ... 19.99
0.01
(10 % of r 10 digits)
20.0 ... 30.0
0.1
(20 % of reading)
30.1 ... 39.9
0.1
(30 % of reading)
*)
Distance between current clamps > 30 cm.
Additional error at 3 V voltage noise (50 Hz) ...........
10 % of reading
Test voltage frequency ...........................................125 Hz
Noise current indication ..........................................yes
Low clamp current indication ..................................yes
Additional clamp error has to be considered.
12.17
Ro – Specific earth resistance
– Specific earth resistance
Measuring range (
m)
Resolution (
m)
Accuracy
0.0 ... 99.9
0.1
See accuracy note
100 ... 999
1
1.00 k ... 9.99 k
0.01 k
10.0 k ... 99.9 k
0.1 k
100 k ... 9999 k
1 k
– Specific earth resistance
Measuring range (
ft)
Resolution (
ft)
Accuracy
0.0 ... 99.9
0.1
See accuracy note
100 ... 999
1
1.00 k ... 9.99 k
0.01 k
10.0 k ... 99.9 k
0.1 k
100 k ... 9999 k
1 k
Principle:
= 2·
·d·Re,
where Re is a measured resistance in 4-wire method and d is distance between the probes.
Accuracy note:
Accuracy of the specific earth resistance result depends on measured earth resistance Re as
follows:
Re
– Earth resistance
Measuring range (
)
Accuracy
1.00 ... 1999
5 % of measured value
2000 ... 19.99 k
10 % of measured value
>20 k
20 % of measured value
