MRU-200
● MRU-200-GPS – USER MANUAL
55
R
E
R
H
,R
S
Additional uncertainty for U = 50 V [%]
0,000 Ω
…3.999 Ω
R
H
≤ 500 Ω and R
S
≤ 500 Ω
within the range of the accuracy
R
H
>
500 Ω or
R
S
>
500 Ω or
R
H
and R
S
>
500 Ω
)
10
4
)
1
1
(
10
5
200
200
10
(
4
3
2
6
H
E
H
E
H
S
S
R
R
R
R
R
R
R
>3.
999 Ω
R
H
≤ 1 kΩ and R
S
≤ 1 kΩ
within the range of the accuracy
R
H
>
1 kΩ or
R
S
>
1 kΩ or
R
H
and R
S
>
1 kΩ
)
10
15
10
5
200
200
10
(
4
3
2
6
H
H
E
H
S
S
R
R
R
R
R
R
R
E
[Ω], R
S
[Ω] and R
H
[Ω] are values which are displayed by the device.
10.2.4 Influence of the auxiliary electrodes upon earth resistance measure-
ments for earth resistivity function (
ρ)
Uncertainty [%]
)
10
4
10
2
,
3
30000
(
2
2
4
7
S
H
E
S
H
R
R
R
R
R
R
E
[Ω], R
S
[Ω] and R
H
[Ω] are values which are displayed by the device.
10.2.5 Influence of the auxiliary electrodes upon earth resistance meas-
urements by means of the impulse method (R
E
4P )
R
H
Z
E
Uncertainty [%]
R
H
≤ 1
50
Ω
0.
0…199 Ω
within the range of the accuracy
R
H
> 1
50
Ω
0,.
…4.9 Ω
)
10
4
100
(
2
E
H
Z
R
5.
0…199 Ω
)
10
7
)
100
((
3
H
R
Z
E
[Ω] and R
H
[Ω] are values which are displayed by the device.
10.2.6 Influence of the interference current I
Z
upon the result of the earth
resistance measurement for method R
E
3P+C
The MRU-200 / MRU-200-GPS meter may perform a measurement, if the value of the interfer-
ence current does not exceed 3 A RMS and the frequency complies with the value set in the MENU.
R
E
U
wy
Uncertainty [
]
≤50
25 V
)
10
5
(
2
3
zakl
E
I
R
50 V
)
10
5
,
2
(
2
3
zakl
E
I
R
>50
25 V
)
10
70
(
2
2
6
zakl
E
I
R
50 V
)
10
50
(
2
2
6
zakl
E
I
R
If the interference current exceeds 3 A the possibility of measurement is blocked.
