HT instruments М75 - Manual (Page 32)

M72 - M73 - M74 - M75
EN - 30
4.14. RCD: TESTS ON AC TYPE RCDS (M73, M74, M75)
The test is performed in compliance with EN61008, EN61009, EN60947-2 part B 4.2.4.1,
VDE 0413 part 6 and IEC/EN61557-6
CAUTION
 Testing an RCD involves the tripping of the RCD itself. Therefore, before
taking this measurement, make sure that no loads are connected to the
RCD under test to avoid damaging them
 Disconnect all loads connected to the RCD as they could add further
leakage currents to those moved by the instrument, thus nullifying the test
results.
Fig. 12: Connection of the instrument’s terminals during RCD test
1. Turn on the instrument
2. Press the arrow keys to select RCD
3. By pressing MODE/PEAK select the test current among the possible values 30mA,
30mA x5, 100mA, 300mA which turn cyclically at each key pressure
CAUTION
Pay attention when setting the test current of the RCD to make sure that the
correct one is selected. In case a higher current than the nominal one of the
device under test is selected, the RCD would be tested at a higher current
than the correct one, thus favouring a quicker tripping of the RCD itself.
As an alternative:
4. Insert the black and green cables in the corresponding input terminals of the
instrument. If necessary insert the croco clips on the test probes
5. Connect the green cable to the protective conductor (earth) and the black cable to
the phase conductor at the lower end of the RCD under test (Fig. 12)
Or:
4. Insert the Shuko cable in the input terminals of the instrument
5. Insert the Shuko cable in a socket at the lower end of the RCD under test