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Power PMAC clock accuracy


andyf
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The clock on the Power PMAC CPU board has a listed tolerance of 50ppm. However, it is the clock crsytal on the ACC-24E board that is the source of the system servo and phase clocks that determines the time accuracy of trajectory motion. The tolerance for these is 100ppm on the ACC-24E2x boards, and 50ppm on the newer ACC-24E3 board.
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No we do not. Most of the people who cannot tolerate 50ppm cannot tolerate, say, 20ppm either. Those who need very high time accuracy for trajectory motion, which includes many observatory users, feed in a very accurate clock into a spare encoder channel and set up the motion to use "external time base". But that involves the clocks on the axis boards, not the CPU. What do you need higher time accuracy on the CPU for?
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