MPI-536 – USER MANUAL
Read out the result.
Measurement result assessment
green:
0.5 I
∆n
< I
A
≤ I
∆n
red:
I
A
≤ 0.5 I
∆n
or
I
A
> I
∆n
After selecting the bar on the
right side, a menu will slide out
with additional measurement re-
sults.
Depending on the selection made
in section 3.8.1 step some of
the parameters below will be dis-
played:
U
B
– voltage measured on PE,
R
E
– PE continuity,
t
A
– RCD triggering time with flow
of RCD disconnecting current.
Selecting the bar hides the
menu.
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in section 5.3.
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).
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