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Originally Posted by Rickertsen2
I have confirmed a suspicion i have had for a while. Apparently the victor 884's do not have a linear PWM input vs. voltage input.
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I think what you're seeing is caused by low a PWM switching frequency. If a speed controller's PWM period is too long, longer than the current rise/fall time caused by inductance, you don't get the smoothing you would with a higher PWM frequency.
Best way to check if the duty cycle is linear would be to use an oscilloscope.