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Expected Phase Code Jitter?


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I seem to be getting higher than expected jitter on my phase code routine.


If I create and run an empty user phase routine, I am getting about +/-8% jitter when the phase interrupt is set to 18kHz (i.e. the measured time between phase code executions varies between 49-60 us, and the nominal is 55 us).


I am using fclock() inside the phase code and writing the calculated time to a Pvar to measure the time between phase code executions.

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