Re: Method of measuring self C of secondary

• To: tesla-at-pupman-dot-com
• Subject: Re: Method of measuring self C of secondary
• From: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Wed, 26 Apr 2000 10:35:45 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

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

>...
> Using your Variac controlled high voltage AC power supply  apply 2.5kV AC
> between the coil and ground and measure the current flow to the coil. Repeat
> this with 5kV. Wind up the volts slowly while checking the current does not
> say go over 100uA.
>...

I see a problem with this measurement. At 60 Hz, the voltage will be
the same along all the coil. In real operation the voltage is zero at
the bottom of the coil and maximum at the top. The difference in the
charge distribution leads to different values for the equivalent
"self-capacitance" of the coil. It would be interesting to see how
these measurements compare with the predictions using Medhurst's
formula.

Antonio Carlos M. de Queiroz

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