Re: How should we measure coil efficiency

From: 	Greg Leyh[SMTP:lod-at-pacbell-dot-net]
Sent: 	Friday, July 25, 1997 12:56 AM
To: 	Tesla List
Subject: 	Re: How should we measure coil efficiency

John H. Couture wrote:

>   I agreed with your eff equation. To find the "energy in Cpri" you need to
> know how much the Cpri voltage actually is after the charging. I believe
> this can only be done with a single charge using a DC Tesla coil. Did you
> meam a DC coil?

I maintain that this msmt can be done during operation, with an HV probe
and an oscilloscope.  One simply has to observe the cap voltage just before
the gap fires.  The msmt results are quite repeatable.

The only reason that the msmt is easier on a DC coil is because the cap voltage
at firing is more constant, so an RMS conversion is not necessary.