Re: Method of measuring self C of secondary

Tesla List wrote:
> Original Poster: "Robert Jones" <alwynj48-at-earthlink-dot-net>

> I believe he assumes the equivalent circuit is valid when resonating with a
> comparatively large external C (<1/10Fr).  I would expect this to be a valid
> equivalent circuit for such conditions.  I did not find any justification
> for such an
> equivalent circuit when the external C has a similar value to the apparent
> C. But I will read the paper again.

Why the restriction? The model must be valid without any extra
or at least without any extra -distributed- capacitor connected to the
top of the coil.
> I also note that as one end is grounded apparent C includes the turn to turn
> C.

Yes, but apparently this capacitance is very small when you consider
all the turns with all these, already small, capacitors in series.
The result is that the "self-capacitance" depends essentially on the 
geometry of the coil.
> I wonder if there is a fixed relationship between the two values i.e. 2
> (assuming validity for reasonable frequencies and an isolated coil say
> hanging from the high ceiling).

By symmetry, the capacitors at both sides of the coil must be identical 
in this condition. I wonder if the measurement of the first impedance
maximum agrees with this.

Antonio Carlos M. de Queiroz