Re: Rotary Spark Gap
Subject: Re: Rotary Spark Gap
From: jim.fosse-at-bdt-dot-com (jim fosse)
Date: Tue, 27 Feb 96 00:08 PST
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> I haven't seen any responses to this one yet, though I suspect that some
>of my mail gets dropped somewhere. My apologies if this has already been
> A quickie back-of-the-envelope calculation shows that the 995H inductor
>has such a high impedance compared to your load resistor (more than a
>couple orders of magnitude) that the load resistors shouldn't have any
>significant effect on the current, and that the current computed is about
>right. The current deduced from your voltage measurement across the load
>resistor is just about exactly what you've computed, so that should make
>you feel good. The only inconsistency is the 0uA current measurement.
> I haven't seen your apparatus, but the fact that you were able to make
>a measurement that does agree with the computed value would lead me to
>first suspect that the ammeter mode in your multimeter isn't working.
>Have you tried it in some different setup to verify that it's OK? Also,
>some multimeters only have a DC current scale. Is this the case, or
>could you have possibly set things up to measure DC current instead of
>AC? It would seem that a reading of somewhere in the range of 0uA would
>be correct there, too. :-)
I had a few responses, so you may want to check your mail reliablilty.
I've come to the conclusion that both my multimeters do not measure
I called magnacraft today, they bought Jefferson Electric whom made
one of the neons xfrms that I now have, the products specialist that I
talked to confermed that from a static current standpoint, a shunt limited
transformer could be treated as a perfect transformer connected in series
with a large inductor. It does not resonate as if It has 995H of inductance
in series with it. He could not give me a secondary inductance value, even
thought I asked him 3 times.