In a message dated 18/03/2005 14:14:12 GMT Standard Time, r@somis.org writes:
I have a high-pot tester and here at 120m above sea level I do not see
corona at 6kV.
You can't always physically see corona. It does make an electrial noise
however, which is how the real high voltage insulation testers determine its
onset by amplifying the noise. That can be quite strange sounding too -
squeals
and so on, where you'd expect a wide band type noise or even a 'popping' type
sound.
73
Peter G3RZP
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