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Re: [TCML] VTTC-tuning. John got me started ;-)

Hi Dex,
I wanted add something about top volts. We have thought long and hard about real time readings of top volts. It's not an easy task. But if through your experiments you devise a means of measuring top volts reliably, please share with us. I realize (as do many others) about estimation of top volts based on base current measurements as well as other methods, however, real time calibrated measurement is very much needed in this field. If you happen upon a method that you believe is accurate, please share your thoughts. We've looked at the high dollar capacitive dividers and all of that type of "normal" equipment. This situation is a bit different as we would like to know the voltage and charge at the top load at the point of inception. 

My best,
Bart

bartb wrote:

Hi Dex,
Let me point you to Paul Nicholson's TSSP site. There have been numerous measurements made regarding current distribution, base current measurements, etc. There is a link on the front page to pn2511. Read through this document (it's right down your path of interest). This may give you a better understanding of what is happening in the background of Javatc which is accounting for the distribution along the secondary. 
http://abelian.org/tssp/

Take care,
Bart

Dex Dexter wrote:

Yes ,you understand me now.
The problem with this can be that current distribution prior and after spark breakout across secondary isn't the same. 
That's the capacitance  spark loading effect.
That will affect more tesla coils with small toroids but big sparks.
We can measure bottom current and make the estimation  only.

Dex
--- bartb@xxxxxxxxxxxxxxxx wrote: 

From: bartb@xxxxxxxxxxxxxxxx
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Cc:
Subject: Re: [TCML] VTTC-tuning. John got me started ;-)
Date: Fri, 3 Apr 2009 18:59:48 -0700 (PDT)

Hi Dex,
(hope you get this ok. My server has a problem and I'm using a backup web 
mail thing to write this).
Are you talking about capturing base current waveforms and looking at the 
data just before breakout? If that is the case, then yes, I agree with
you. This will eliminate everything after breakout.
Excellent! I think I understand where you are going with this. As long as 
you store the data and differentiate the time at which breakout occurs
(ignoring anything after breakout), then yes, you will get a good look at top volts in a one-shot mode of operation. Continuous operation will prove 
difficult of course.

Take care,
Bart




Hi Bart,
No I don't think so.
It doesn't depend on the temperature of the day,humidity,radius of
curvature etc.
If you consider it more it is not the formula for the prediction.
It is formula for calculation if you know secondary base current (or given 
the current).
That's the voltage developed across inductor.
The only unknown thing is "L" which varies from design to design and size 
of topload.

Dex


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