MRU-200-GPS OPERATING MANUAL Version 1.06
56
R
E
R
H
,R
S
Additional uncertainty for
V
= 50 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
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 meas-
urements for function
ρ
Additional 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 percussive method
R
H
Z
E
Uncertainty [%]
R
H
≤1
50
Ω
0,0…199Ω
within the range of the basic
uncertainty
R
H
>1
50
Ω
0,0…4,9Ω
)
10
4
100
(
2
E
H
Z
R
5,0…199Ω
)
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 3P+clamp
The MRU-200 meter may perform a measurement, if the value of the interference current does
not exceed 3A rms and the frequency complies with the value set in the MENU.
R
E
V
wy
Uncertainty [
]
≤50
25V
)
10
5
(
2
3
zakl
E
I
R
50V
)
10
5
,
2
(
2
3
zakl
E
I
R
>50
25V
)
10
70
(
2
2
6
zakl
E
I
R
50V
)
10
50
(
2
2
6
zakl
E
I
R
If the interference current exceeds 3A the measurement is cancelled.
