On 17.10.11 07:41, Jan de Kruyf wrote:
> so get hold of a biggish ferrite or even better powder ring core and
> loop the mains cable through as many times as will fit.
If the EMI is exclusively high frequency, then that'll probably work
well enough. But stuffing enough turns of the mains cable into a
humungous toroid is perhaps doing it the hard way. A 6A,120/250v
shielded common-mode balanced line filter is almost small enough to
close my fist around, bolts neatly in the equipment enclosure, and has
convenient terminals. (Unfortunately I don't know what they cost, since
my junk box supplies mine.)
> Alternatively there might be inductive coupling between the inductor
> in the light and the transformer in the UPS. that should be curable by
> moving the UPS as far away as possible from the light. Interference
> goes down relating to the square of the distance.
True, but the problem vanished when the mains input to the UPS was
disconnected. That pretty much excludes such inductive coupling, since
it would be unchanged by that.
> But at this moment I am putting my bets on the copper wire.
It's odds-on, after the last test.
Erik
--
Never worry about theory as long as the machinery does what it's
supposed to do.
- Robert A. Heinlein
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