Re: [TCML] Voltage Question

["Udo Lenz" <udo_lenz@xxxxxxxxxxxxxx>]

Hi Paul,

I wonder how accurate that really is. The secondary voltage
depends on the magnetic field inside the secondary. One part of the
field comes from the secondary current. If that is the only contribution
to the field the equation you gave would be correct. But also the
field from the primary needs to be added in

Udo

> 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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