[TCML] Voltage Question
cn at q.com
Tue Jan 24 08:33:56 MST 2012
Measuring the base current is a good idea. If you put a peak-reading
meter on the current-viewing resistor, it would be useful for a number
of things, like a tuning indicator. Shouldn't be too hard to do. You
could also use a wideband current probe from Pearson, but that's big
bux. Gives good isolation, though.
> Ed Phillips wrote:
> > The 'before streamers' bit is all important of course.
> Yes, below breakout the secondary response is linear and
> this offers another method of calibration -
> Put a small shunt resistor between secondary base and ground
> so that a scope can measure the base current. Say 1 ohm so
> that 1 volt on the scope corresponds to 1 amp of base current.
> Run the system at a drive level below breakout.
> Calculate the top voltage using the effective secondary
> inductance Les obtained from JavaTC,
> Vtop = 2 * pi * Fres * Les * base_current
> Observe the response of the E-field probe and work
> out the calibration factor. With care this could be
> accurate to 5%.
> Paul Nicholson
> Tesla mailing list
> Tesla at pupman.com
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