Re: cap firing voltage scope measurements question

To: tesla-at-pupman-dot-com
Subject: Re: cap firing voltage scope measurements question
From: "John H. Couture" <COUTUREJH-at-worldnet.att-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Sat, 19 Jun 1999 18:55:40 -0600
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme


  John -

  It certainly is a mystery. To charge the cap to 840 watts (joules?) would
require 1680 watts input! With a 1000 watt input you have over unity energy!
Or am I misreading your test?

  John Couture

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

At 05:07 PM 6/16/99 -0600, you wrote:
>Original Poster: FutureT-at-aol-dot-com 
>
> All,
>
> I'm seeing some strange results in my TC:
> 
> Here are some cap voltage measurements under different conditions:
> 
> I set my input variac at 60, and the scope indicated the output voltage
> of xfrmer was 15.2kVpeak, without the TC connected.
> 
> At the same variac setting, but with TC connected, but with the 
> spark gap removed, the cap voltage reads 22.3kVpeak.  I suppose
> I'm getting some resonant charging here with this particular ballast
> setting.
> 
> At the same variac and ballast setting, but with the gap firing 
> (120bps), and the TC producing sparks, the cap voltage reads
> 30.4kV.  This means I'm obtaining a 2X voltage increase during 
> ~1/2 cycle, I thought this degree of resonant build up was possible
> only when using DC charging?
> 
> Does this seem normal?  I would have expected the voltage to be
> lower with the gap firing since there's less time for resonant voltage
> build-up.  In there a gap in my understanding?  Or is my scope
> reading wrong?  The 30.4kV makes sense from a Joule perspective,
> since it comes out to 840 cap watts or so, and the meter reads 1000
> watts, which seems about right. 
>
> Mystery, or insanity?
> 
> Thanks,
> John Freau >>
>
>
>

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