Re: AC Resistance (formerly Spice Simulation Pictures)

To: tesla-at-pupman-dot-com
Subject: Re: AC Resistance (formerly Spice Simulation Pictures)
From: "Robert W. Stephens" <rwstephens-at-ptbo.igs-dot-net>
Date: Tue, 5 Nov 1996 12:36:01 -0500
>>From couturejh-at-worldnet.att-dot-netSun Nov  3 22:17:33 1996
>Date: Sun, 3 Nov 1996 05:22:54 +0000
>From: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
>To: tesla-at-pupman-dot-com
>Subject: Re: AC Resistance (formerly Spice Simulation Pictures)

>At 05:25 AM 10/31/96 +0000, you wrote:
>>> Subject: Re: Spice simulation pictures
>>
>>From bert.hickman-at-aquila-dot-comWed Oct 30 22:04:11 1996
>>Date: Wed, 30 Oct 1996 18:14:25 -0800
>>From: Bert Hickman <bert.hickman-at-aquila-dot-com>
>>To: tesla-at-pupman-dot-com
>>Subject: Re: AC Resistance (formerly Spice Simulation Pictures)
>>
>>Tesla List wrote:
>><SNIP>
>>> 
>>> >From couturejh-at-worldnet.att-dot-netTue Oct 29 22:49:50 1996
>>> Date: Tue, 29 Oct 1996 19:34:48 +0000
>>> From: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
>>> To: tesla-at-pupman-dot-com
>>> Subject: Re: Spice simulation pictures
>>> 
>>
>> Big snip  ------------------------------------
>>   
>>
>>Given the above parameters, what does your graph predict for Rac?
>>
>>Safe computin' to ya, Jack!
>>
>>-- Bert --
>>
>>-------------------------------------------------
>
> Bert -
>
>Your data did not include the Q factor of your coil. The 82.6 ohms you give
<SNIP>
>important that this parameter be given extra attention and optimized during
>the design stage. 
>
>Understanding and studying the Reff parameter would give the advanced
>coilers a means of increasing the spark length and overall efficiency of
>their coils. It is apparent that as we learn more about the Reff resistance
>of Tesla coils we can design the coils to produce more output and be more
>efficient.
>
>Jack C.

Jack,

What do you think of this measurement technique?  Take your stand 
alone secondary and place it in series with a carbon composition 
potentiometer.  Apply a sine wave from a signal generator at 
the resonant frequency of the secondary coil under test across the 
coil-pot series circuit.  With a VTVM of sufficient frequency response, or an 
o-scope, adjust the value of the pot until the amplitude across it 
matches exactly the amplitude across your coil.  Now disconnect the 
pot and measure its DC resistance with an accurate digital ohm meter. 
This number is your Reff and also your Rac.

rwstephens