Re: Re^2: Vortex gap loss measurements

["Andreas Marshall" <marand-at-t-online.de> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Thanks, John.
I do not plan to build a professional test facility in a way like this:
"Here's the Coil - now let's see the pecentages of losses in it".
My first aim is to proof statements about losses in the primary,
mainly filter, transformer, cap, inductance.
Without secondary, i use the following approach for the Voltage:
U(t)=U0*exp (-t*delta)*cos ...
My first setup is like this:
A primary circuit (with MMC, acts also as voltage divider for the oscilloscope)
is
driven by a small OBIT with max. 3kVeff. Primary L is about 15micro-H, C is
6,67nF.
Gap is extreme poor (two copper wires).
Now i look on the screen and notice some values of the ring-down.
>From these values I calculate the factor delta, which is equal to R/(2L). So i
get
a value for an R which is the sum of all losses.
In further time, I will change many parameters, esp. the gap, of the setup and
will
find different values for R.
I know, a gap has no constant resistance, but the approach of others
(like constant voltage drop) is also not exact because of the short pulses.
The first mesurement says: R=1,88Ohm (all losses together)

Can You tell me about these 3 dozen TC parameters you speak off? Maybe I
left some out.

Thanks and greetings from poor-weather-germany.

Andreas

Tesla list wrote:

> Original poster: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
>
> Andreas -
>
> A test facility for Tesla coils is an ambious project. Dozens of coilers
> have done this in the past and we still do not know enough about the losses
> and energy transfers to come up with overall efficiencies. That is only a
> start. There are over three dozen important TC parameters to consider.
> However, stick with the simple classical TC circuit and don't get bogged
> down with complications like DC supplies. We will all be interested in
> hearing about your progress. Good luck.
>
> John Couture
>
> ---------------------------
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Monday, September 04, 2000 11:40 AM
> To: tesla-at-pupman-dot-com
> Subject: Re^2: Vortex gap loss measurements
>
> Original poster: "Andreas Marshall" <marand-at-t-online.de>
>
> I am working on a simple method to get at least a
> qualitative method to find losses in L, C, spark gap,
> energy transfer to the secondary etc.
> Give me one or two weeks to find equations and build
> a test facility.
>
> To your question:
> Nearly right, but on the other hand:
> Voltage drop is current multiplied by resistance.
> resistance is !!not!! constant, neither time-invariant.
> On the other hand, a spark gap in pulse duty does not
> have the property to keep voltage drop constant.
> Within one gap bang, current rises, charge carrier were
> created, electrodes got heated, ions were wandering
> through space...
>
> Hope I can say more after having tested this matter a bit.
>
> Greetings
>
> Andreas