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Re: [TCML] Re: Dummy load for optimum cap size Experimentation
Gary
Very good experiment and report!
The gradual rise is PD output (fig 1) might be an artifact of TCR
effects in your "lossy tank" circuit; the copper wire TCR is
+0.3937% / deg C, and no idea what the lamps TCR effect is
but could in fact be slightly negative with temperature (more
light output the hotter it is).
Also with the stray L in the circuits that even with predominately
Rloading, there will be some VHF/UHF generation going on
although very fast transients (cricial damping <<5 RF cycles)
with every SG firing.
Thanks for the report!
Best Regards
On Fri, Oct 8, 2010 at 9:25 PM, Gary Lau <glau1024@xxxxxxxxx> wrote:
> All,
>
> I'm pleased to have completed my experiment,to determine the optimum
> capacitor value for a Tesla coil using a static gap, by monitoring the
> output of a halogen lamp dummy load in place of the primary coil. I had
> originally planned to do this for both 15/60 and 15/30 NST, but due to time
> constraints, I just did it for three different 15/60's. Maybe later...
>
> When I started the experiment, I was certain that I would find that the
> table used to choose cap values based on NST specs wasn't right, since it
> was generated (I think?) using just simulation results. But it turns out
> that it's pretty close, at least for a 15/60.
>
> Other finding were that using a Variac to boost the NST primary voltage
> above 120VAC results in a huge boost to power throughput.
>
> Also, the power throughput when using a static gap, is far more chaotic than
> I had ever imagined. It's not enough to try to average things over a few
> seconds, 20 seconds, or even a minute. Even after averaging for two
> minutes, there are still variations. I think this may explain why coils
> sometimes deliver the occasional exceptionally long spark, but it's not
> repeatable.
>
> I have generated a comprehensive report, about a megabyte download. Please
> look in http://drop.io/garylau for Dummy Load Experiment.pdf It's a good
> read.
>
> To those who loaded me equipment, I thank you again.
>
> Regards, Gary Lau
> MA, USA
> _______________________________________________
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>
--
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA USA
Sharpe's Axiom of Murphy's Law
"Physics trumps opinion!"
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