Sonel MPI-540 - Measurement of Current (True RMS); Frequency Measurement

MPI-540 – USER MANUAL
181
10.2.4 Measurement of current (True RMS)
Current
Range and condi-
tions
Resolution
Basic uncertainty
I
RMS
(AC+DC)
Basic uncertainty of the device
10% I
nom
≤ I
RMS
<
100% I
nom
0.01% I
nom
2%
Flexible clamps F-1A/F-2A/F-3A
0..3000 A
(10 kA
p-p
@ 50Hz)
0.01% I
nom
Additional uncertainty
1% (2% taking into account additional
error due to the position)
Hard clamps C-4A
0..1000 A
(3600 A
p-p
)
0.01% I
nom
Additional uncertainty
0.1..10 A:  (3% + 0.1 A)
10 A: 3%
50 A: 1.5%
200 A: 0.75%
1000..1200 A: 0.5%
Hard clamps C-5A
0..1000 A
(3600 A
p-p
)
0.01% I
nom
Additional uncertainty
0.5..100 A: ≤ (1.5% + 1 A)
100..800 A: ≤ 2.5%
800..1000 A AC: ≤ 4%
800..1400 A DC: ≤ 4%
Hard clamps C-6A
0..10 A
(36 A
p-p
)
0.01% I
nom
Additional uncertainty
0.01..0.1 A:  (3% + 1 mA)
0.1..1 A: 2.5%
1..12 A: 1%
Hard clamps C-7A
0..100 A
(360 A
p-p
)
0.01% I
nom
Additional uncertainty
0..100 A:  (0,5% + 0,02 A) (45..65 Hz)
0..100 A:  (1,0% + 0,04 A)
(40..1000 Hz)
Crest Factor
1..10 (max. 3.6 for
I
nom
)
for I
RMS
≥ 1% I
nom
0.01
5%
10.2.5 Frequency measurement
Frequency
Range and conditions
Resolution
Basic
uncertainty
f
40..70 Hz
15% U
nom
≤ U
RMS
≤ 120% U
nom
0.01 Hz
0,05 Hz