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Re: Calculating streamer breakout of top-loads



Original poster: Paul Nicholson <paul-at-abelian.demon.co.uk> 

Dr. Resonance wrote:

 > The planar antenna does work as Terry has calibrated it against
 > his fiberoptic probe pickup.

The problem, as Rikard Titus alludes to below, is that the
calibration is invalidated by the presence of space charge and
streamers around the topload and secondary.  The output signal
from the probe depends on the capacitance between it and the
secondary/topload - and this may be quite a bit different during
breakout.

Rikard Titus wrote:

 > I doubt the method of pick up antenna you described was useful
 > for precise measurment of secondary voltage for coils producing
 > discharge though.

I suppose this decalibration would diminish with probe distance,
because the TC would more closely approximate a dipole when seen
from a distance and the precise details of the charge distribution
would have less influence on the readings.

But having said all that, maybe in reality these effects are not
too great.  Has anyone checked this?

One way to test this might be to look at the output from 2 or 3
probes, set at various distances. Calibrate them all at a low
top voltage, then go above breakout and see if all the probe
outputs increase in the same proportion.

--
Paul Nicholson
--