Grey Jaguar No Power Out

[Mark McLeod]

I mean it's weirder than I thought it'd be.

The bottom line seems to be that the Jag at 100% provides 2v less power than the Victor.

It has nothing to do with the multimeters, they work fine. They might under report the power based on the output waveforms, but the results are certainly usable and close enough for the average FRC team.
The PWM signals have the appropriate ranges for each device. They also are fine.

The Victor and Jag (via scope) both have the expected designed output waveforms at anything other than full power.
The Jag's is a lot more vigorous of course.

The Jag does something funny.
The power output waveform begins at lowest duty cycle by oscillating in the range, say ~2v (rather than 0v as expected) to battery voltage. As power is increased, the lower bound rises towards the upper bound which remains steady at battery voltage.
At ~90% the upper bound of the waveform begins collapsing as the last 10% is transistioned. The upper limit of the waveform begins to drop to meet the still rising lower bound. Although the lower bound stops 2v down and waits for the upper bound to fully collapse to meet it.
Eventually, at 100% duty cycle they meet at a point 2v less than the battery voltage.
So peak voltage on the Jag output is 2v less than the battery voltage.

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My scope is an old 40MHz Kenwood that doesn't get used a lot. The multimeters are Craftsman sale specials.
Certainly I'd like someone else to repeat the results before saying I didn't make some measurement mistake.