MRU-200-GPS OPERATING MANUAL Version 1.06
55
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 3P, 4P, 3P + clamp
R
Additional uncertainty [
Ω]
0.000 to 3.999
Ω
z
E
z
E
V
R
V
R
)
10
2
10
25
(
4
4
>3.999
Ω
z
E
V
R
)
10
2
10
5
(
2
4
10.2.2 Influence of the serial interference voltage V
Z
upon earth resistance
measurements for function
ρ
add
[
Ω] =
Z
Z
H
E
V
V
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 3P, 4P, 3P + clamp
R
E
R
H
,R
S
Additional uncertainty [%]
0.000 to
3,999
Ω
R
H
≤500Ω and
R
S
≤500Ω
within the range of the basic uncertainty
R
H
>500Ω or
R
S
>500Ω or
R
H
and R
S
>500Ω
)
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
>3,999Ω
R
H
≤1kΩ and R
S
≤1kΩ
within the range of the basic uncertainty
R
H
>1kΩ or
R
S
>1kΩ or
R
H
and R
S
>1kΩ
)
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
R
E
R
H
,R
S
Additional uncertainty for
V
= 25 V [%]
0.000
Ω
to 3,999
Ω
R
H
≤500 Ω and R
S
≤500 Ω
within the range of the basic uncertainty
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 i R
S
≤1 kΩ
within the range of the basic uncertainty
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
