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Two strang things my testing has found???


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From:  John H. Couture [SMTP:couturejh-at-worldnet.att-dot-net]
Sent:  Monday, March 09, 1998 12:40 PM
To:  Tesla List
Subject:  Re: Two strange things my testing has found???


  Terry -

  As you know there is very little information available on the waveforms
that are produced by Tesla coils. I was thinking of writing up a short
brochure on the subject with sketches and calcs of the waveforms. Your test
data would be of great value.

  John Couture 

----------------------------------------------

At 08:54 AM 3/8/98 -0600, you wrote:
>
>----------
>From:  terryf-at-verinet-dot-com [SMTP:terryf-at-verinet-dot-com]
>Sent:  Saturday, March 07, 1998 10:47 PM
>To:  Tesla List
>Subject:  Two strange things my testing has found???
>
>        I have been looking at voltage and current waveforms now for a few
>days with my VI probe and there are two issue I would like to request
>information on.
>
>        First-  The output terminals of my 15000 volt, 60 mAmp neon
>transformer seem to have about 150pF across them internally (like a big
>parasitic capacitance).  This is causing some current spikes with certain
>input filter circuits.  Other filter circuit do better because of this.
>Anyone ever ran into this before????
>
>        Second- Just before the primary spark gap fires there is a little
>current pulse I am seeing.  It is about 10% of the real initial pulse but it
>has opposite polarity.  Very strange.  I far as I can tell the pulse is real
>and not a glitch or anything.  It seems to almost always be there.  If
>anyone has any information on this I would love to here your thoughts.  I
>will try to get a picture of it on my web page
>(www.peakpeak-dot-com/~terryf/Tesla/Main.html) ASAP.
>
>        I have made a number of improvements to my system and it is working
>very well :-)  My spice models and the actual results now show excellent
>correlation since these improvements.  The little spark gap pulse does not
>show up in the models.  However, I use perfect switches and such in the
>models.  This may be hiding something that happens in real systems like this
>pulse.  I have completely overcome the bandwidth issue with redesigned
>transducers.  Now even the voltages and currents show perfect 90 degree
>phase differences and the levels are all correct! I will write up more
>information as time permits.  I am working on detailed planes for the probe
>and will publish them when the design is stable.
>        I am begining to set up for real TC tests using this equipment
>rather than the test circuits I have been using so far.  Now that I have the
>VI probe working so well, it is time to really turn it loose. :-)) 
>
>Thanks
>
>        Terry
>        terryf-at-verinet-dot-com
>
>
>