MI 3101 EurotestAT: Measurements
Testing RCD
54
Loop resistance is indicative and calculated from Uc result (without additional proportional
factors) according to:
N
C
L
I
U
R
.
Figure 5.14: Example of contact voltage measurement results
Displayed results:
Uc....... Contact voltage.
Rl........ Fault loop resistance.
5.3.2 Trip-out time (RCD t)
Trip-out time measurement verifies the sensitivity of an RCD at different residual currents.
Trip-out time measurement procedure
Select the
RCD
function.
Set sub-function
Tripout time
t.
Set test
parameters
(if necessary).
Connect
test cable to the instrument.
Connect
test leads to the tested object (see
figure 5.13
).
Press the
TEST
key.
After the measurement is finished
store
the result (optional).
Figure 5.15: Example of trip-out time measurement results
Displayed results:
t .......... Trip-out time,
Uc....... Contact voltage for rated I
N
.
