# RE: Re^2: Vortex gap loss measurements

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Andreas -

For the TC parameters you can start with the JHCTES Ver 3.1 computer program
at

http://home.san.rr-dot-com/jcouture/tesla

This program has 30 TC parameters. The Ver 4.0 will have about 46 parameters
including coupling, mutual inductance, secondary voltage, efficiencies, etc.
The programs are for classical TC only. There is not enough empirical
information available on magnifiers, etc, to make this kind of program
possible.

John Couture

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-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, September 07, 2000 11:03 AM
To: tesla-at-pupman-dot-com
Subject: Re: Re^2: Vortex gap loss measurements

Original poster: "Andreas Marshall" <marand-at-t-online.de>

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
>
> 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.
>
> 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

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