Re: measuring the resonant frequency of the secondary

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

Original poster: "Harold Weiss" <hweiss-at-new.rr-dot-com> 

Gerry's right,

I found that the load of the o-scope will change the resonant frequency if
connected to the toroid.  The capacitor formed by the toroid is proximity
sensitive.  Take two LEDs and hook them in parallel with opposite polarity
and hook that into the ground lead.  Then hook up the signal
generator/o-scope to the primary.  The LEDs will glow at resonant peaks.
The brightest peak will be the main frequency, and the dimmer peaks will be
the harmonics.

David E Weiss

 > Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net>
 >
 > I suggest you not hook the Oscope to the toroid but instead attach a piece
 > of wire as an antenna to measure the resonant frequency.  You may get two
 > resonances (a primary and secondary) if not in tune.  Primary resonance
can
 > be measured directly by driving it with a signal generator thru 10Kohms
and
 > attaching the scope to the primary.  The secondary resonance can be
measured
 > by driving the base of the secondary with the signal generator and
measuring
 > the effect with the antenna method.
 >
 > Gerry R
 >
 >  > Original poster: "Anthony" <ant17-at-optushome-dot-com.au>
 >  >
 >  > hi guys i hoping you could help me i have my sstc secondary and primary
 >  > hooked up to signal genorator and i am trying to measure the resonant
 >  > frequency of it by having the primary hooked up to the sig gen and my
 >  > oscilloscope probe on the toroid and then checking for peaks in the
 >  > waveform becasue i think you should see ringing peaks in the waveform
 >  > question is am i on the right track or not if you could help i would be
 >  > greatful
 >  >
 >  >
 >
 >
 >