Re: Coil Efficiency (and true wattmeter)

From: 	FutureT-at-aol-dot-com[SMTP:FutureT-at-aol-dot-com]
Sent: 	Tuesday, June 24, 1997 2:39 PM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: Coil Efficiency (and true wattmeter)

In a message dated 97-06-21 07:13:23 EDT, you write:

<< Hi all,
>          I think we could be on the verge of making some real 
> progress in nailing down the merits of actual coil parameters. There 
> is much to be done in the wall socket -> coil efficiency stakes. But 
> if we look at the raw E x BPS vs spark length figures, we can start 
>to see where the coils themselves might be improved. I think there is 
> now a most fruitful area of research open to us. We might at last 
> have a platform from which to examine L/C ratios and the like. It 
 >seems obvious now that when using current efficiency measurements we 
> are floundering around in the dark (with an arc to light the way :)
> Malcolm

Malcolm, All,

I agree.  Can you suggest a simple way to measure the capacitor voltage?

Regarding wall plug power; who knows how the distorted and pulsed
waveforms are affecting our ammeters and wattmeters.  To solve the
problem, I suggest that we all build the optical isolator wattmeter
suggested by Dave Sharpe of the TCBOR.  Dave has I believe posted
info on the results of the project...and I believe accuracy was within
5% which is a lot better than any typical meter, because this optical
isolator device gives an accurate representation of the true 
instantaneous power delivered to the load even  with a wandering 
input voltage and a non-linear, reactive load.   The max power input
for the circuit is 1300 watts, but maybe this can be "upped" using 
appropriate shunts.  I haven't built one yet, but I don't really think 
there's any choice, unless someone can suggest something simpler
of comparable accuracy.

Maybe Dave will add some more info here about his unit.

John Freau