Re: Spark Gap VI Scope Capture

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

Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

I've done some quick analysis..
First, if you decimate the data by 10 (and appropriately low pass filter 
before decimating (I used matlab.. which filters at 0.8*Fs/2) you can start 
to see some real structure.

There's a "low frequency" exponential looking offset in the waveform that 
extends over the entire waveform.  If you look at the expanded view inside 
the discharge, you can see that the voltage is essentially constant during 
the spark (which is sort of what you expect.  Assuming that the constant 
voltage is straddling the real number, it looks like a voltage drop of 
about 60-75 volts is a good representation of the "steady state part of the 
discharge.

figures can be found at:

http://home.earthlink-dot-net/~jimlux/images/vi1.png  - expanded view of 
decimated data
http://home.earthlink-dot-net/~jimlux/images/vi2.png  - all data, decimated by 10


At 12:32 PM 5/20/2003 -0600, you wrote:
>Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
>
>Hi Jim,
>
>Looks like this:
>
>http://hot-streamer-dot-com/temp/03-05-20-01.gif
>
>I tried over smaller times spans but it did not really seems to show much.
>
>Cheers,
>
>         Terry
>
>At 07:03 AM 5/20/2003 -0700, you wrote:
>>One might want to plot V vs I for the gap... While time domain behavior is
>>interesting, I'd be interested to see the VI characteristic for the gap...
>>
>>
>> > I have no idea where this voltage offset comes from but it seems to
>> > certainly have an effect on quenching here!!
>> >
>> > Much to ponder in this little spark ;-)))
>> >
>> > Cheers,
>> >
>> > Terry
>> >
>> >