[TCML] Terry Fritz secondary voltage/current measurement antenna
coiler at afterthepulse.com
Tue Dec 7 09:31:56 MST 2010
Greetings fellow coilers,
I've just built a copy of Terry Fritz's antenna to measure secondary
voltage and current based on his paper:
To calibrate the antenna, I used Pearson 410 & 411 current probes
(0.1V/amp), and found that I had to place the antenna about 44 inches
from the coil (yow!) instead of the 62 inches he mentions in the
design. Then, computing the TC voltage using the measured current, and
comparing that to the scope waveform, I had to multiply the scope values
by 200,000 (instead of 1,000) to match voltages. The computed values
were about 200kV peak, and I'm getting hard strikes over 33 inches long,
so it seems reasonable.
After each pulse, there's also a DC offset on the voltage signal,
(presumably due to the 16 nanofarads of capacitance on the voltage
antenna), that tapers off to zero between pulses (primary coil firings).
Question: Does anyone have experience with this design, and perhaps
improvements since 1997? Any help/insight would be appreciated.
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