Sonel MPI-520 - Page 62

MPI-520 OPERATING MANUAL version 3.4
60
Measurement of resistance-to-earth R
E
Test range according to IEC 61557-5: 0,5 …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...9.99 
0.01 
(2% w.m. + 4 digits)
10.0...99.9 
0.1 
(2% w.m. + 3 digits)
100...999 
1 
1.00...1.99 k
0.01 k
 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 k
Measurement of resistance of auxiliary earth electrodes R
H
, R
S
Display range
Resolution
Basic uncertainty
000...999 
1 
(5% (R
S
+ R
E
+ R
H
) + 3 digits)
1.00...9.99 k
0.01 k
10.0...50.0 k
0.1 k
Measurement of interference voltages
Internal resistance: about 100 k
Range
Resolution
Basic uncertainty
0...100 V
1 V
(2% w.m. + 3 digits)
Low-voltage measurement of continuity of circuit and resistance
Measurement of continuity of protective conductors and equipotential bondings with 200 mA
current
Test range according to IEC 61557-4: 0,12…400 
Range
Resolution
Basic uncertainty
0.00...19.99 
0.01 
(2% w.m. + 3 digits)
20.0...199.9 
0.1 
200...400 
1 
 Voltage at open terminals: 4…9 V
 Output current at R<2 : min. 200 mA (I
SC
: 200..250 mA)
 Compensation of test leads resistance
 Measurements for both current polarizations
Measurement of resistance with low current
Range
Resolution
Basic uncertainty
0.0...199.9 
0.1 
(3% w.m. + 3 digits)
200...1999 
1 
 Voltage at open terminals: 4…9 V
 Output current < 8 mA
 Audio signal for resistance being measured < 30 ±50%
 Compensation of test leads resistance