METREL EurotestCOMBO MI 3125 User Manual

MI 3125 / BT EurotestCOMBO Measurements
40
Figure 5.19: Example of trip-out time measurement results
Displayed results:
t ........... Trip-out time,
Uc ........ Contact voltage for rated I
N
.
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
Note
Start value
End value
AC
0.2I
N
1.1I
N
Sine
All models
A, F (I
N
 30 mA)
0.2I
N
1.5I
N
Pulsed
A, F (I
N
= 10 mA)
0.2I
N
2.2I
N
B, B+
0.2I
N
2.2I
N
DC
Model MI 3125 BT
Maximum test current is I

(trip-out current) or end value in case the RCD didn’t trip-out.
Trip-out current measurement procedure
* model MI 3125 BT
 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 5.17).
 Press the TEST key to perform the measurement.
 Store the result by pressing the MEM key (optional)*.
Trip-out
After the RCD is turned on again
Figure 5.20: Trip-out current measurement result example

METREL EurotestCOMBO MI 3125 Specifications

General

Brand	METREL
Model	EurotestCOMBO MI 3125
Category	Measuring Instruments
Language	English