Sonel MPI-540 - Measurement of Resistance-To-Earth R

MPI-540 ● MPI-540-PV – BRIEF USER MANUAL
63
8.1.6 Measurement of resistance-to-earth R
E
Test range according to IEC 61557-5: 0.50…1.99 k for test voltage of 50 V
oraz 0.56…1.99 k for test voltage of 25 V
Range
Resolution
Accuracy
0.00...0.35 Ω
0.01 Ω
(2% m.v. + 10 digits)
0.35...9.99 Ω
0.01 Ω
(2% m.v. + 4 digits)
10.0...99.9 Ω
0.1 Ω
(2% m.v. + 3 digits)
100...999 Ω
1 Ω
1.00...1.99 kΩ
0.01 kΩ
 test voltage: 25 V or 50 V rms
 test current: 20 mA, sinusoidal rms 125 Hz (for f
n
=50 Hz) and 150 Hz (for f
n
=60 Hz)
 blocking of measurement at interference voltage of U
N
>24 V
 maximum measured voltage of interferences U
Nmax
=100 V
 maximum resistance of auxiliary earth electrodes 50 kΩ
Selective measurement of earthing with clamps
Range
Resolution
Accuracy*
0.00...0.35 Ω
0.01 Ω
±(8% m.v. + 10 digits)
0.35...9.99 Ω
0.01 Ω
±(8% m.v. + 4 digits)
10.0...99.9 Ω
0.1 Ω
100...999 Ω
1 Ω
1.00....1.99 kΩ
0.01 kΩ
* – at maximum interference current of 1 A
 Measurement with additional current clamps C-3,
 The range of interference current is up to 9.99 A.
Selective measurement of earthing with two clamps
Range
Resolution
Accuracy*
0.00...0.35 Ω
0.01 Ω
±(10% m.v. + 10 digits)
0.35...9.99 Ω
0.01 Ω
±(10% m.v. + 4 digits)
10.0...19.9 Ω
0.1 Ω
20.0...99.9 Ω
±(20% m.v. + 4 digits)
* – at maximum interference current of 1 A
 Measurement with transmitting clamps N-1 and receiving clamps C-3.
 The range of interference current is up to 9.99 A.
Measuring soil resistivity (ρ)
Range
Resolution
Accuracy
0.0...99.9 Ωm
0.1 Ωm
Depending on the ac-
curacy of the meas-
urement R
E
100...999 Ωm
1 Ωm
1.00...9.99 kΩm
0.01 kΩm
10.0...99.9 kΩm
0.1 kΩm
 Measurement with Wenner method,
 Option for setting the distance in meters or feet,
 Selecting a distance: 1 m ... 30 m (1 ft ... 90 ft).