MRU-200
● MRU-200-GPS – USER MANUAL
52
Measurement of earth resistance
– 3-pole method with additional clamp (R
E
3P+C)
Range of measurement in accordance with IEC 61557-5: 0,120
… 1999
Range
Resolution
Accuracy
0,000
…3,999 Ω *
0,001
Ω
±(8% m.v. + 4 digits)
4,00
…39,99 Ω
0,01
Ω
±(8% m.v. + 3 digits)
40,0
…399,9 Ω
0,1
Ω
400
…1999 Ω
1
Ω
* In 0,000
…0,045 Ω range uncertainty is unspecified.
Measurement of multiple earth resistance
– two-clamp method (2C)
Range
Resolution
Accuracy
0,00
…19,99 Ω
0,01
Ω
±(10% m.v. + 3 digits)
20,0
…149,9 Ω
0,1
Ω
±(20% m.v. + 3 digits)
Earth resistivity measurement (
ρ)
The measurement method: Wenner’s, ρ = 2πLR
E
Range
Resolution
Accuracy
0,0
…199,9 Ωm
0,1
Ωm
Depends on the accuracy
of the R
E
4P measurement
but not less tha
n ±1 digit.
200
…1999 Ωm
1
Ωm
2,00
…19,99 kΩm
0,01
kΩm
20,0
…99,9 kΩm
0,1
kΩm
100
…999 kΩm
1
kΩm
distance between measurement probes (L): 1
…50 m
Earth impedance measurement
– impulse method (R
E
4P )
Range
Resolution
Accuracy
0,0
…99,9 Ω
0,1
Ω
±(2,5% m.v. + 3 digits)
100… 199 Ω
1
Ω
impulse shape: 4/10
µs, 8/20 μs or 10/350 µs
impulse measurement current: approximately 1 A
spike voltage: approximately 1500 V
Measurement of leakage damage current (RMS)
Range
Resolution
Accuracy
0,1
…99,9 mA
1
0,1 mA
±(8% m.v. + 5 digits)
100
…999 mA
1
1 mA
±(8% m.v. + 3 digits)
1,00
…4,99 A
1,2,3,4
0,01 A
±(5% m.v. + 5 digits)
1,3,4
unspecified
2
unspecified for 0
…2 A
3
unspecified for 0
…1 A
4
5,00
…9,99 A
1,2,3,4
0,01 A
±(5% m.v. + 5 digits)
10,0
…99,9 A
1,2,3,4
0,1 A
100 … 300 A
1,2,3,4
1 A
1
– clamp (diameter 52 mm) – C-3
2
– flexible clamp – F series
3
– flexible clamp – FS-2
4
– flexible clamp – FSX-3
frequency range: 45
…400 Hz
