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Originally Posted by Joe Johnson
How many RISING edges per channel per rev?
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Yes, that would be a very clear way to specify it.
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Also, how well are the falling edges positioned wrt the rising edges (how close to 50% duty cycle is it?)
Finally how well are the two channels oriented (90 degree being optimal -- thus quad in the name)?
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In their
datasheet for the E4P, US Digital calls the former "symmetry" and the latter "quadrature delay". See attachment.