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Sonel MPI-540 User Manual

Sonel MPI-540
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MPI-540 USER MANUAL
78
The last measurement can be recalled using the icon.
Measurement of the triggering time t
Ai
(t
A
measured during I
A
measurement) for se-
lective RCDs is not available.
The measurement of triggering time t
Ai
is not performed as required by applicable
standards (i.e with RCD nominal current I
n
), but with I
A
current measured and
displayed during the measurement. In most cases where the measurement does
not have to be strictly as defined by the standard, this measurement may be taken
into account to assess the proper operation of RCD protection in a particular instal-
lation. When measured I
A
is lower than I
n
(most frequent case), then triggering time
t
Ai
will be usually longer than the triggering time measured in function t
A
, which
measures the time at I
n
current:
I
A
< I
Δn

t
Ai
> t
A
where:
t
Ai
= f (I
Δn
)
Therefore, when time t
Ai
is s correct (not too long), it may be assumed that the time
measured in function t
A
would be also correct (it would not be longer).
Additional information displayed by the meter
Measurement in progress.
U
B
>U
L
!
The touch voltage exceeds a preset U
L
threshold value.
The meter is ready for measurement.
U
L-N
voltage is incorrect for making a measurement.
U
L-PE
voltage is incorrect for making a measurement.
U
N-PE
voltage is incorrect for making a measurement.
Phase connected to N terminal instead of L terminal (for
example, exchange of L and N in the mains socket).
Network frequency is outside the range of 45...65 Hz.
PE conductor connected incorrectly.
Measurement error.
Before measurement, voltage at test terminals exceeds
500 V.

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Sonel MPI-540 Specifications

General IconGeneral
BrandSonel
ModelMPI-540
CategoryMeasuring Instruments
LanguageEnglish

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