[time-nuts] PPS delay on rockwell
Hal Murray
hmurray at megapathdsl.net
Sun Feb 15 21:34:47 UTC 2015
francesco.messineo at gmail.com said:
> I measured the PPS output with an HP-5328B, PPS of the thunderbolt as start,
> rising edge, rockwell PPS as stop, rising edge. The delay is 406.3 ms +/- 30
> uS.
> Are those numbers normal for a rockwell chipset? Any idea why the two PPS
> are so far apart? PPS offset on the thunderbolt is set to 0.
Do you have a scope? What's the width of the Rockwell PPS?
Are you triggering on the correct edge? Is there an inverter in there
someplace?
I would try all 4 combinations of rising/falling edges and see if any of them
match cleanly. That could happen if the Rockwell PPS is 500 ms wide.
--
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