Re: Oscilloscope observations on unpowered TC

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

Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>

Tesla list wrote:
 >
 > Original poster: "Jolyon Vater Cox by way of Terry Fritz 
<twftesla-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>
 >
 > Connecting the oscilloscope probe to the influence ring of my capacitive
 > transformer TC with no excitation applied and the Y-input set to
 > 0.5volts/div AC, I counted 19 peaks at 2uS/div which gives 950000Hz
 > and 13 beats at 50uS/div which gives a beat frequency of 26000Hz
 > Assuming 950000Hz is the Mean frequency
 > minus the beat frequency this is 924000Hz (the lower frequency ,k)
 > plus the beat frequency this is 976000Hz (the upper frequency, l)
 > so the mean number of cycles per beat is 950000/26000 =36.54 cycles per beat
 > and mean number of cycles to peak voltage is 36.54 cycles.
 > Are these calculations sound and do they give a meaningful result?

With 36.54 cycles per full beat the operation close to mode 36:37.
f2/f1 = 37/36
The average frequency is 950 kHz = (f1+f2)/2
950 = (f1+37/36*f1)/2
f1 = 2*950/(1+37/36) = 937 kHz
f2 = 37/36*f1 = 963 kHz
The beat frequency is (f2-f1)/2 = 13 kHz
But there are -two- beats per cycle of this frequency (DSB waveform).

Antonio Carlos M. de Queiroz