I put together some pictures.
The following two pictures (which have to be rotated by +90 and -90 degree, respectively) showour ground cable for the HV probe connected inside the cabinet. The length is around 30-40cm.
And that's the HV cable connected to the oscilloscope:
Finally, here's how we measure:
Since we are expecting beam tomorrow, we prepared the kicker to be in kicking mode. During the next beam off time, we'll continue the measurements, repeat the series for one card and see how it changes (although we already did that and the results are quite stable).
Greetings
Peter