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Re: [TCML] Voltage Question

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
--

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