Dan, your scheme will work to determine some components, but it will not
do much curve tracing, and will not be able to fire some thyristors and
triacs. Using software PWM and two coil boosters on the 'E' and 'C' pins
will get you nearer but the metering scheme will become more complex and
would require an AD. A two channel SMPSU in boost config. controlled by
the PIC (which would have AD) would be a more appropriate idea imho. It's
a good idea for low cost testers though.

Peter

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