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MI 3100 s, MI 3100 SE EurotestEASI Measurements
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Figure 5.18: Example of contact voltage measurement results
Displayed results:
Uc ......... contact voltage
Rl .......... fault loop resistance
5.4.2 Trip-out time (RCDt)
Trip-out time measurement verifies the sensitivity of the RCD at different residual currents.
Trip-out time measurement procedure
Select the RCD function using the function selector switch.
Set sub-function to RCDt using UP / DOWN keys.
Set test parameters (if necessary).
Connect test cable to the instrument.
Connect test leads to the item to be tested (see Figure 5.17).
Press the TEST key to perform the measurement.
Store the result by pressing the MEM key (MI 3100 SE only).
Figure 5.19: Example of trip-out time measurement results
Displayed results:
t ............ trip-out time
Uc ......... contact voltage for rated IN
5.4.3 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 Notes
Start value End value
AC 0.2IN 1.1I
N Sine All models
A, F (IN 30 mA) 0.2IN 1.5I
N Pulsed
A, F (IN = 10 mA) 0.2IN 2.2I
N
Maximum test current is I (trip-out current) or end value in case the RCD didn’t trip-out.
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