MI 3321 MultiservicerXA
Machine testing operating mode
134
9.2.6.2
Trip out time (RCD t)
Trip-out time measurement verifies the sensitivity of an RCD, at different test currents.
Trip out time measurement procedure
Select the
RCD t
single test.
Set test
parameters
.
Connect
three wire test lead to the TP1 test port on the instrument.
Connect
the three wire test lead to L,N (downstream of the RCD) and PE terminals
of the machine.
Press the
START
key for the measurement.
Press
SAVE
(F4) key for storing the result (optional).
Example of RCD trip out time measurement results
Displayed results:
Main result ............. Trip-out time,
Uc .......................... Contact voltage for rated I
N
.
Note:
The RCD t test will trip the RCD. Assure that the instrument is not powered from a
socket protected by the tested RCD.
9.2.6.3
Trip out current (RCD I)
A continuously rising residual current is intended for testing the threshold sensitivity for
RCD trip-out. The instrument increases the test current in small steps through
appropriate range as follows:
RCD type
Slope range
Waveform
Note
Start value End value
AC
0.2
I
N
1.1
I
N
Sine
all instrument
versions
A (I
N
30 mA)
0.2
I
N
1.5
I
N
Pulsed
A (I
N
= 10 mA)
0.2
I
N
2.2
I
N
B
0.2
I
N
2.2
I
N
DC
instrument HW
version 3.0 and higher
Maximum test current is I
(trip-
out current) or end value in case the RCD didn’t trip-out.
