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Re: EMI Filters

Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>

Paul,

Many digital VOMs misbehave when the waveform is anything but a sine wave.
When impulses are flying around from spark discharges, many DVMs won't
function at all.  If you use an analog meter, you will see that your
measurements are what you would expect.
--Steve Y.

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, May 05, 2005 11:20 AM
Subject: EMI Filters


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> Original poster: "Paul B. Brodie" <pbbrodie@xxxxxxxxxxxxx>
>
> I have a 20A EMI filter wired in reverse between the wall outlet and my
> variac. I have a volt meter attached to the variac outlet.
>
> I was driving one of my ignition coils with a 600 watt dimmer in series
> with a 2mF cap. As I powered up the variac, I could read the voltage
> increasing on the volt meter all the way up to 120V. When I turned up the
> dimmer, the voltage indication on the volt meter went haywire when the
coil
> began sparking. If I drew the ground away from the HV output, the volt
> meter would stabilize as soon as the sparks stopped.
>
> What have I missed here? This isn't normal, is it??!! Could the EMI filter
> be bad?
> Paul
> Think Positive
>
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