Re: Measuring self-capacitance directly (Re: flat secondary)

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

Original poster: "Steve Greenfield by way of Terry Fritz <twftesla-at-qwest-dot-net>" <alienrelics-at-yahoo-dot-com>

Cool. So it is a rule of thumb, that so far is proving
to be close for flat coils, too. Interesting that both
were right on 0.67 ratio.

Steve Greenfield

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Paul Nicholson by way of Terry
> Fritz <twftesla-at-qwest-dot-net>"
> <paul-at-abelian.demon.co.uk>
> 
> Steve Greenfield wrote:
> > This will measure capacitance to ground, but what
> > about turn-to-turn capacitance?
> 
> The capacitance between neighborouring turns
> contributes very
> little, 1% or so, to the total effective
> capacitance, at least in
> solenoids.  
-snip-
> For flat coil models, I have only two, tentatively,
> because the
> software is still under test,
> 
> System   H/D     Cdc     Ces at Fres    Ces/Cdc
> dt1      0.0    12.7pF    8.5pF          0.67
> mm5      0.0    20.6pF   13.9pF          0.67