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Re: Collected coil data (fwd)
---------- Forwarded message ----------
Date: Wed, 29 Jul 1998 05:11:01 -0500
From: "Robert W. Stephens" <rwstephens-at-headwaters-dot-com>
To: tesla-at-pupman-dot-com
Subject: Re: Collected coil data (fwd)
> --------- Forwarded message ----------
> Date: Tue, 28 Jul 1998 18:09:19 +0000
> From: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Re: Collected coil data (fwd)
>
>
> Terry -
>
> Thank you for doing the work of collecting the coil data and posting the
> info on the List. This will be a big help for the coilers developing TC
> computer programs. However, why are you using joules for primary energy input?
>
> This could be a big mistake in rating Tesla coils because it leaves too
> much room for errors in judgement. This could result in wild estimates of
> the true nature of the TC input for a certain output spark length.
>
> The joules rating you are using are watt seconds for a particular spark
> length. The spark lengths are varying with a continuous operating coil and
> the watt seconds are varying. With a continuous operating TC the watt
> seconds for a particular spark cannot be measured, only estimated.
>
> It makes more sense to use measured RMS ratings for both input and output
> instead of estimated instantaneous ratings. I don't think you would want the
> Electric Utility basing your electric bill on estimated instantanneous
> values.
>
> John Couture
John, All,
Regardless of line cord size, distance from the power station, the
exact nature of the power supply employed, or the color burst
reference frequency in the NTSC color system, it is the tank circuit capacitor,
and its level of stored energy which is an easy number to establish with
reasonable accuracy, that determines how much energy is actually going INTO
the Tesla coil circuit on a bang by bang basis. The accepted engineering term for
desribing the amount of energy stored in a capacitor is Joules.
In the case of single shot testing with the capacitor being charged
from a DC power supply of accurately known voltage, there can be
little room for any ambiguity in the system's performance
specification. All coils, tested in this single shot manner could be
accurately compared.
Using the term 'Joules' to describe _primary bang size_ as a common
descriptor amongst varied coils of all sizes and origins makes excellent
practical, repeatable sense IMO.
Robert W. Stephens
Director
Lindsay Scientific Co.
RR1 Shelburne, ON Canada L0N-1S5
Tel or AutoFax: 1-519-925-1771
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