MRU-200-GPS OPERATING MANUAL Version 1.06
53
Measurement of multiple earth resistance with clamp (three-cable with clamp)
Range of measurement in accordance with IEC 61557-5: 0.120
to 1999
Range
Resolution
Basic uncertainty
0.000 to 3.
999Ω *
0.
001Ω
±(8% m.v. + 4 digits)
4,00 to 39.
99Ω
0.
01Ω
±(8% m.v. + 3 digits)
40.0 to 399.
9Ω
0.
1Ω
400 to1,
999Ω
1Ω
* In 0.000 to 0.045
Ω range uncertainty is unspecified.
Measurement of multiple earth resistance with double clamp
Range
Resolution
Basic uncertainty
0.00 to 19.
99Ω
0.
01Ω
±(10% m.v. + 3 digits)
20.0 to149.
9Ω
0.
1Ω
±(20% m.v. + 3 digits)
Ground resistivity measurements
The meas
urement method: Wenner’s, ρ = 2πLR
E
Range
Resolution
Basic uncertainty
0.0 to 199.
9Ωm
0.
1Ωm
Depends on the basic un-
certainty
of
the
R
E
4P measurement but not
less than ±1 digit.
200 to 1,
999Ωm
1Ωm
2.00 to 19.
99kΩm
0.
01kΩm
20.0 to 99.
9kΩm
0.
1kΩm
100 to
999kΩm
1kΩm
distance between measurement probes (L): 1 to 50m / 164 ft.
Measurement of leakage damage current (rms)
Range
Resolution
Basic uncertainty
0,1..99,9mA
1
0,1mA
±(8% m.v. + 5 digits)
100..999mA
1
1mA
±(8% m.v. + 3 digits)
1,00..4,99A
1,2,3,4
0,01A
±(5% m.v. + 5 digits)
1,3,4
unspecified
2
unspecified for 0..2 A
3
unspecified for 0..1 A
4
5,00..9,99A
1,2,3,4
0,01A
±(5% m.v. + 5 digits)
10,0..99,9A
1,2,3,4
0,1A
100 … 300A
1,2,3,4
1A
1
– current clamp (diameter 52mm / 2.2ins) – C-3
2
– flexible Rogowski probe – F-1
3
– flexible Rogowski probe – FS-2
4
– flexible Rogowski probe – FSX-3
frequency range: 45 to 400Hz
