MRU-200
● MRU-200-GPS – USER MANUAL
54
10.2 Additional data
Data regarding additional uncertainties are useful mainly in the case the meter is used under
non-standard conditions as well as for measurement laboratories for the purpose of calibration.
10.2.1 Influence of the serial interference voltage U
Z
upon earth resistance
measurements for functions R
E
3P, R
E
4P, R
E
3P+C
R
Additional uncertainty [
Ω]
0,00
0…3,999Ω
z
E
z
E
U
R
U
R
)
10
2
10
25
(
4
4
>3,999
Ω
z
E
U
R
)
10
2
10
5
(
2
4
10.2.2 Influence of the serial interference voltage U
Z
upon earth resistance
measurements for earth resistivity function (
ρ)
add
[
Ω] =
Z
Z
H
E
U
U
R
R
)
10
10
(
5
,
2
6
3
,
where
L
R
E
2
10.2.3 Influence of the auxiliary electrodes upon earth resistance meas-
urements for function R
E
3P, R
E
4P, R
E
3P+C
R
E
R
H
,R
S
Additional uncertainty [%]
0,000…
…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
4
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.
For measurements with the use of ERP-1 adapter
R
E
R
H
,R
S
Additional uncertainty for U = 25 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
20
10
5
200
200
10
(
4
3
2
6
H
H
E
H
S
S
R
R
R
R
R
R
