Hi Kevin,
Thanks for sharing. Very interesting.
cheers
Jim
On Sat, 3 Dec 2011, Kevin Cozens wrote:
> On 11-12-03 06:38 AM, Jim Jackson wrote:
> > 50us is pretty small. Did you do any measurements to measure the jitter on
> > the phase shift? Just interested in the sort of accuracy you could get.
>
> First, a correction. The phase shift wasn't 50uS, it was 25uS. I just
> checked the project documentation and images captured from the scope.
> At the start of the project I thought I wouldn't be able to get such a small
> phase delay but later I gave it a shot and was pleasantly surprised to find
> it worked.
>
> With the main application running in a mostly idle state I noticed no
> jitter. The most likely time for any jitter would be when the board is
> counting pulses from a flow meter (using interrupts). I would expect some
> jitter while dealing with up to a couple thousand interrupts per second but
> I never had the scope hooked up while running those tests.
>
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