Terry,
Yes, thank you. However, the CH2 Mean measurement of 71.3mv isn't accurate
because it appears to be > 200mv! I assume the probe was set at 0-10A with
an output of 10mv/Amp, this makes the input current measurement on CH2 to be
> 2A Mean.
The CH1 voltage measurement seems to indicate the coil is driven from a
positive supply thru a P-Channel FET or equiv and the power supply voltage
is ~20Vdc judging from the CH1 vertical cal at 4.52v/div!?
The pulse width measurements are different between CH1 and CH2 so, taking
the longer CH1 duration of 27.5ms, these measurements yield > 1.1J/pulse
which is somewhat close to your calcs.
One thing that bothers me a little is the increase in saturation voltage of
the assumed P-Channel FET at the relative low current of ~ 2A so they must
be using a small die area device. This could certainly be improved upon.
Jon F
-----Original Message-----
From: jonfli
Just curious as to the calibration/div for the current probe used on
Ch2 to arrive at your energy calc above?
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See the post to George on the probe specs. Does that answer your
question?
Terry
