[TCML] Voltage Question

[Carl Noggle]

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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