Re: Spark Gap VI Scope Capture

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

Hi Ken

At 09:28 AM 5/20/2003 -0700, you wrote:
>Terry,
>
>Most detailed & interesting!  But what are the >units< of resistance in
>http://hot-streamer-dot-com/temp/2003-05-19-11.jpg?

It is in Ohms.  I don't know why the resistance is "negative" for every 
other half cycle.

>If ohms, then such a gap
>as you tested is n.g. for low-voltage primary circuits.

Yes.  But more current seems to make less resistance too.  This was only 
like 60 amps peak.

>If the gap was
>of some length e.g. 1/4" or thereabouts, can you make the same kind of
>test for, say, a 1/16" gap?

I can run anywhere.  But this was just a first try so I was going real easy 
and low power.


>Do we infer that the -11.jpg image is for the current shown in
>http://hot-streamer-dot-com/temp/2003-05-19-07.jpg?

Yes. all the data is for this one single spark capture.  I just graphed the 
same data in different ways.


>Also, what are the vertical-axis units in the "spark" images?

The red trace is volts in real volts.

The blue trace is current but I sometimes scaled it by 10 or 100 to make it 
more visible.  The "Bx*100" in the far left legend shows the scale factor.



>I'm trying, of course, to get an understanding of what the measured
>resistance might be for running thousands of amperes through a very
>closely-spaced gap.

I will try reducing the inductance next I think.

Cheers,

         Terry


>Ken Herrick
>
>On Mon, 19 May 2003 19:05:56 -0600 "Tesla list" <tesla-at-pupman-dot-com>
>writes:
> > Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
> >
> > Hi again All,
> >
> > I just added the resistance graphs of the gap here too:
> >
> > http://hot-streamer-dot-com/temp/2003-05-19-10.jpg
> >
> > http://hot-streamer-dot-com/temp/2003-05-19-11.jpg
> >
> > Cheers,
> >
> >         Terry
> >
> > ----------------------------------------------
> >
> >
> >
> > Hi All,
> >
> > I figured out this way to look at the voltage across and the current
> >
> > through a spark gap:
msnip...