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Re: How should we measure coil efficiency
From: John H. Couture[SMTP:couturejh-at-worldnet.att-dot-net]
Sent: Saturday, July 26, 1997 2:47 AM
To: Tesla List
Subject: Re: How should we measure coil efficiency
At 05:51 AM 7/26/97 +0000, you wrote:
>
>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.
>
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Have you measured the cap voltages and found they were the same at each break?
What were the BKS/sec?
Was it possible to measure the cap voltage for one long free air spark?
How did it compare with the cap voltages for the shorter sparks?
Note that the length of the spark depends upon the voltage and energy in
the cap.
If there were no changes in the cap voltages do you think the ionization
of the air is being averaged out over time? I have never heard of anyone who
has checked this possibility.
JHC
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>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.
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I was thinking of a DC one shot only spark like measuring a single break
spark JHC
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>-GL
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