Re: Why the difference in Fo WinTesla & Fantc?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

Hi Brad and Bart,

At 11:35 PM 1/30/2003 -0800, you wrote:
...........
>------------------------------------------------------
>
>>Also, I do have tested Q ratings for both the primary and secondary.
>>My RLC has that function.  The primary's Q= .25 and the secondary's Q= 
>>3  What does this tell me other than the relationship of true reactance 
>>to resistance?
>
>Not much. Probe loading spoils the Q. What you'll want to do is actually 
>measure with a scope antenna of some type. Good readings will be best with 
>a lowZ amp on the front end of a generator. Pinging the coil is maybe the 
>best approach I'm aware of, but not sure what type of equipment you have 
>at your disposal. There are various methods and some approaches are better 
>than others. Terry has papers at his website on various tests he's 
>performed and he does a great job at documenting his method and tools of 
>approach. Also look through his misc files. I believe there's a low Z amp 
>circuit drawn up. Don't be frightened if Terry has the best equipment 
>around. Many of us simply have generators, scopes, and the typical tools. 
>His equipment has been used to derive some very accurate data for various 
>tests. Paul's TSSP website also has various tests performed by the TSSP 
>group. These are a couple good web sites to see how others are performing 
>some of these measurements. I'm not sure if it's something you want to 
>actually do now, but I'd recommend reading up on it. The List Archives and 
>pupman-dot-com is also a good place to search past posts on Q. There's a whole 
>lotta info in those archives.
>
>http://hot-streamer-dot-com/
>http://www.abelian.demon.co.uk/tssp/
>
>Take care,
>Bart

You can't actually hook any probe physically to the secondary for Q 
measurements.  Even a Tek 5100 probe adds too much loading (but it is the 
best one if you want to try).  There are two ways to really measure Q.  You 
can pulse the coil with a pinger and use Paul's super powerful program 
(unix not windows, and the test equipment gets pretty extreme).  Or, you 
can try a simple wire antenna to pick of the fields around the coil (fast 
and easy way).  If you take the voltage far off resonance and then find the 
voltage at resonance, Q is just the ratio.  I am not sure how desperate you 
are to find Q, but there are fancy ways of doing it if you are 
interested.  I am sure your secondary Q is far higher than 3 
;-))  Honestly, Paul's programs could probably calculate Q more accurately 
than normal folks can measure it ;-)

Primary Q has to take into account losses in the actual spark at the 
gap.  Adding any 3 ohm resistor as a simulated spark will get you pretty close.

If you want to delve into the mad art of coil dynamics, we can tell you 
much more!

http://hot-streamer-dot-com/temp/pn2511.pdf

http://hot-streamer-dot-com/temp/pn1401.pdf

http://www.abelian.demon.co.uk/tssp/qvar070402/

http://hot-streamer-dot-com/temp/Paul/4-06/

http://hot-streamer-dot-com/TeslaCoils/MyPapers/MyPapers.htm

http://hot-streamer-dot-com/temp/PING%20TESTER.jpg

http://hot-streamer-dot-com/temp/Qvar/Image1.jpg

http://hot-streamer-dot-com/temp/Qvar/NewSystem.gif

http://hot-streamer-dot-com/temp/Qvar/Tek00001.gif


Cheers,

         Terry