"Ian Thompson-Bell" wrote in message
...
Good idea but not the cause I think. I am using a purely analogue meter
(Ferrograph RTS2).

Well, the phenomenon remains unexplained -- a mystery.


And by the way, I am in the UK.

Ooops! I did not look at your e-mail address.
And I am in Australia.
Regards,
Alex

Cheers

Ian