shield the E-field ?

[cutty]

P:S: your friend means that :  https://en.wikipedia.org/wiki/Isolation_transformer
(but I'm nor sure if this really works !)

Thomas

Now, that is sort of cute, and a good one on me...   English is my language, and I have to do a lot of Google translate...
Gert spelled it, for me, as "govanis trova" in his email... so playing around awhile I came up with something like
"Galvanic Detector"..  possibly meaning an EMI meter.. 

These language things can be confusing....

I Think the display runs backwards, at times, in Gert's movie, because of the different frame rates in Gert's SWF, and the frame rate of the Signals display... and means little other than the frequencies of the noise may also vary  in addition... resulting in that effect.