Sonel MPI-540 - Page 176

MPI-540 – USER MANUAL
174
Measurement of resistance-to-earth R
E
(for TT)
Selected
nominal cur-
rent
of RCD
Test range
Resolution
Test
current
Basic
uncertainty
10 mA
0.01...5.00 kΩ
0.01 kΩ
4 mA
0..+10% m.v. ±8 digits
30 mA
0.01...1.66 kΩ
12 mA
0..+10% m.v. ±5 digits
100 mA
1...500 Ω
1 Ω
40 mA
0..+5% m.v. ±5 digits
300 mA
1...166 Ω
120 mA
500 mA
1...100 Ω
200 mA
1000 mA
1...50 Ω
400 mA
Measurement of touch voltage U
B
in relation to nominal differential current
Test range according to IEC 61557-6: 10.0 V...99.9 V
Test range
Resolution
Test
current
Basic
uncertainty
0...9.9 V
0.1 V
0.4 x I
n
0%...10% m.v. ±5 digits
10.0...99.9 V
0%...15% m.v.
Measurement of RCD disconnection current I
A
for sinusoidal differential current
Test range according to IEC 61557-6: (0.3...1.0)I
Δn
Selected nomi-
nal current
of
RCD
Test range
Resolution
Test
current
Basic uncer-
tainty
10 mA
3.0..10.0 mA
0.1 mA
0.3 x I
n
..1.0 x I
n
5% I
n
30 mA
9.0 .. 30.0 mA
100 mA
30..100 mA
1 mA
300 mA
90..300 mA
500 mA
150..500 mA
1000 mA
300..1000 mA
 it is possible to start the measurement from the positive of the negative half of forced leakage cur-
rent
 test current duration............................... max. 8.8 s
Measurement of RCD disconnection current I
A
for differential unidirectional pulsed current and
unidirectional
pulsed current with 6mA direct current offset
Test range according to IEC 61557-6: (0.35...1.4)I
n
for I
n
≥30 mA and (0.35...2)I
n
for I
n
=10 mA
Selected nomi-
nal current
of
RCD
Test range
Resolution
Test
current
Basic uncer-
tainty
10 mA
3.5..20.0 mA
0.1 mA
0.35 x I
n
..2.0 x I
n
10% I
n
30 mA
10.5..42.0 mA
0.35 x I
n
..1.4 x I
n
100 mA
35..140 mA
1 mA
300 mA
105..420 mA
500 mA
175..700 mA
 measurement may be performed for positive or negative half-periods of forced leakage current
 test current duration................................ max. 8.8 s