The RCD has been tested outside the installation (see: "test setup") A current sense resistor of 1 ohm is inserted in series with the green earth cable (not visible on the image).
The scope recording can be seen in "Full recording". The failing ramp test (negative) is marked with "6" and zoomed versions are "6-1" and 6-1-1"
METREL has verified that the tester makes a pre-test as seen in "6"
To me the waveform shape looks good (despite some small spikes) and the RMS values are also reaching 1.5 A before the test stops and fails because the RCD didn't trip. So it must be a faulty RCD or are these minor spikes the reason?
The RCD has been tested outside the installation (see: "test setup") A current sense resistor of 1 ohm is inserted in series with the green earth cable (not visible on the image).
The scope recording can be seen in "Full recording". The failing ramp test (negative) is marked with "6" and zoomed versions are "6-1" and 6-1-1"
METREL has verified that the tester makes a pre-test as seen in "6"
To me the waveform shape looks good (despite some small spikes) and the RMS values are also reaching 1.5 A before the test stops and fails because the RCD didn't trip. So it must be a faulty RCD or are these minor spikes the reason?
