Re: Tesla Coil toroid Size-Measurements??

• To: tesla-at-pupman-dot-com
• Subject: Re: Tesla Coil toroid Size-Measurements??
• From: "John H. Couture" <couturejh-at-worldnet.att-dot-net> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Fri, 18 Sep 1998 03:32:12 -0600
• Approved: terryf-at-verinet-dot-com

  Terry -

  The low Power Factor is telling you that the test is wrong. Don't feel
bad. Most coilers do this input watts per foot of spark test incorrectly.

  Can't go into details now. Eye surgery.

  John Couture

------------------------


At 09:12 PM 9/16/98 -0600, you wrote:
>Original Poster: Terry Fritz <terryf-at-verinet-dot-com>
>
>Hi John, All,
>
---------------------  snip

>This is a 15kV /60mA driven coil with about 20nF in the primary circuit
>(111kHz Fo).
>
>inp002.jpg - These are the voltage and current waveforms without the gap
>firing.  The top trace is 50 volts/div and the bottom trace is 5 amps/div.
>Note that the voltage is leading the current by 3.4 mS (73 degrees) giving
>a power factor of 0.285.  Hardly 100%!!  In this case the RMS voltage is 40
>volts and the RMS current is 5 amps.  If you just multiply the voltage and
>current you get 200 watts.  However, if you then multiply by the power
>factor, the real power is 57 watts!  Without taking the power factor into
>account you miss the true input power by 350%!!
>
--------------------   snip
>
>	Terry Fritz
> 

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