Re: Impedance change in SST Magnifier

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

Original poster: "Gary Johnson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <gjohnson-at-ksu.edu>

John:

I have not seen this effect on my solid state system, but have thought that
something like this might occur under the right conditions. Are the details
of your system available somewhere?

Gary Johnson

At 11:00 AM 12/26/2001 -0700, you wrote:
>Original poster: "John Tomacic by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<tesla_ownz_u-at-hotmail-dot-com>
>
>
>Hi everyone, Happy Holidays!!
>
>I have a question about an observed impedance change in the operation of my 
>soild state magnifier coil. While operating in CW and interrupt modes the 
>impedance of the coil was constant at Fres for various power input levels 
>below 3 Kwatts. I changed the drive transformer to increase the power to the 
>magnifier coil to about 3.7 Kwatts based on the previously measured 
>impedance.  Everything was as expected in CW operation, with the impedance 
>constant as with lower power levels.  However, when running the coil in 
>interrupt mode, at Fres, under certain conditions (ingterrupt duty cycle 
>about 30%, frequency 107 Hz)the impedance of the magnifier dropped to less 
>than half of what it was before, then slowly oscillated between the two 
>values at about one to 3 hertz.  At this low impedance level the controller 
>was pumping about 10 K watts peak into the magnifier, producing 24" arcs to 
>a hand held aluminum rod (see picture attached).  Does anyone have an 
>explanation as to what's happening, and has anyone else observed this?
>
>http://hot-streamer-dot-com/temp/DSC00008m.jpg
>
>John Tomacic
>
>
>
>