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

MPI-540 – USER MANUAL
175
Measurement of RCD disconnection current I
A
for differential direct current
Test range according to IEC 61557-6: (0.2...2)I
n
Selected nom-
inal current
of RCD
Test range
Resolution
Current
Basic uncer-
tainty
10 mA
2.0..20.0 mA
0.1 mA
0.2 x I
n
..2.0 x I
n
10% I
n
30 mA
6..60 mA
1 mA
100 mA
20..200 mA
300 mA
60..600 mA
500 mA
100..1000 mA
 measurement can be performed for positive or negative forced leakage current
 test current duration................................ max. 5.2 s
10.1.6 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
and 0.56…1.99 k for test voltage of 25 V
Range
Resolution
Basic uncertainty
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
Measurement of resistance of auxiliary earth electrodes R
H
, R
S
Display range
Resolution
Basic uncertainty
000...999 Ω
1 Ω
(5% (R
S
+ R
E
+ R
H
) + 3 digits)
1.00...9.99 kΩ
0.01 kΩ
10.0...50.0 kΩ
0.1 kΩ
Measurement of interference voltages
Internal resistance: approx. 8 M
Range
Resolution
Basic uncertainty
0...100 V
1 V
(2% m.v. + 3 digits)
Selective measurement of earthing with clamps
Range
Resolution
Basic uncertainty*
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.