Right, there is jitter, no doubt about it. I think 3-7 us is typical, from
what I've seen of various posts on this list over the last few months,
with maximum deviations around 20 us. Someone (Rob Butera?) reported that
the jitter increased somewhat as the task period decreased. An inspection
of the list archives will reveal some of these earlier discussions of
jitter.
If stable periodicity is required, perhaps a hardware solution is the best
answer to your problem. I'm afraid my knowledge of this area is lacking,
but you may wish to invesigate FPGAs, CPLDs, and DSPs. Even with hardware
there is still jitter though, you just push it into the ns or ps range.
-Don
On Thu, 22 Apr 1999, Yorck von Collani wrote:
> Hello,
>
> I'm new on these list so I do not know if these theme has ever been
> discussed:
>
> I have measured the periodicity of a RT - Task with an oscilloscope and
> and have sean a jittering. A stabile periodicity is very important
> for me.
>
> Any idea ?
>
> Regards
> Yorck
>
>
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