Re: toroid inner

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

Original poster: Bart Anderson <classi6-at-classictesla-dot-com> 

Hi Tom, Antonio,

Yes, I ran this last night as well (but didn't have the energy to post).
Javatc showed 17.18 pF.

I also used the posted toroid size with my 4.5" coil to look at the toroid 
in position above ground and in proximity of course to a coil.

260 kHz (15.834 pF) w/o disc
259.8 kHz (15.84 pF) with disc

Makes little difference.

Also interesting, where the minor diameter is very small (1" x 15"),

285.31 kHz (11.166 pF) w/o disc
279.8 kHz (12.464 pF) with disc

Greater change, but still, in the scheme of things it doesn't really affect 
much (unless your comparing error of a program to a measurement, etc.).

Take care,
Bart



Tesla list wrote:

>Original poster: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br>
>Tesla list wrote:
> >
> > Original poster: "Tom Luttrell PWRCOM" <tom-at-pwrcom-dot-com.au>
> >
> > According to Antonio's Inca program a 130mm (5") x 380mm (15") toroidal
> > ring with a flat plate in the centre has a total capacitance of
> > 22.0385092562 pF.
> > Without the flat plate this drops to: 21.9997926390 pF.
> > A difference of 0.0387 pF, i.e. next to no difference.
>
>Just a detail:
>A 0.38x0.13 (diameters) toroid has 17.2109 pF
>With the center closed I get 17.2123 pF
>The description would be:
>Ctoroid terminal 100 0.125 0 0.065 0 360
>Lcenter terminal 100 0 0 0.06 0
>
>Your toroid has 380 mm as the diameter of the center of the tube.
>Ctoroid terminal 100 0.19 0 0.065 0 360
>Lcenter terminal 100 0 0 0.125 0
>
>Antonio Carlos M. de Queiroz
>
>
>
>