From: "Poul-Henning Kamp" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Some results of PRS10 and Trimble Resolution Date: Wed, 28 Jun 2006 20:38:48 +0000 Message-ID: <[EMAIL PROTECTED]>
> In message <[EMAIL PROTECTED]>, [EMAIL PROTECTED] writes: > > > >Using an interpolator with a slow basic clock as Magnus suggests is > >probably > >the easiest way to prevent EMI issues, but it has some disadvantages such > >as: > > > >* You need to design a fairly tricky [...] > > I actually benchmarked the on in the PRS10 by feeding it a 1PPS > generated from another Rb that was deliberately adjust approx 1e-10 > low. > > I can't seem to find the results anymore, but if any of you want to > reproduce it, it was a pretty trivial setup. > > As I remember it, the standard deviation was approx 3nsec, and I > seeing some "missing codes", Ie: readings that just didn't > happen in practice. This can happend with some interpolator designs. The reason is how you treat the data and correct for scale-error. You will move the statistics you expect for one sample to one of the neighbor samples. There are naturally some easy tricks around that one. ;O) Cheers, Magnus _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
