MI 3125 EurotestCOMBO
Testing RCD
35
Displayed results:
t ...........Trip-out time,
Uc........Contact voltage for rated I
Δ
N
.
5.5.3 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:
Slope range
Waveform
RCD type
Start value End value
Note
AC
0.2
×
I
Δ
N
1.1
×
I
Δ
N
Sine
A (I
Δ
N
≥
30 mA)
0.2
×
I
Δ
N
1.5
×
I
Δ
N
A (I
Δ
N
= 10 mA)
0.2
×
I
Δ
N
2.2
×
I
Δ
N
Pulsed
Both models
Maximum test current is I
Δ
(trip-out current) or end value in case the RCD didn’t trip-out.
Trip-out current measurement procedure
Select the
RCD
function using the function selector switch.
Set sub-function
RCD I
.
Set test
parameters
(if necessary).
Connect
test cable to the instrument.
Connect
test leads to the item to be tested (see
figure 5.18
).
Press the
TEST
key to perform the measurement.
Trip-out
After the RCD is turned on again
Figure 5.21: Trip-out current measurement result example
