[time-nuts] Setting up PRS10 with M12+T GPS

Azelio Boriani azelio.boriani at screen.it
Wed May 2 20:03:10 UTC 2012


You don't have a Cs reference but you have a GPS: in the long term it is
the same. By using a TIC (your preferred: HP5370B, HP5372A, SR620, PM6680,
PM6681, HP53132A, Racal 2351, Yokogawa TA720, PICTIC II, Wavecrest DTS275
[SIA3000?] and others) keep track of the GPS PPS vs. the PRS10 PPS.

On Wed, May 2, 2012 at 9:46 PM, Jerry Mulchin <jmulchin at cox.net> wrote:

> I need some guidance from the collective.
>
> I just finished rebuilding my PRS10 lab standard and it is now using a
> M12+T GPS module.
> I have completed my site survey and it is now in "hold position mode",
> TRAIM is enabled
> with 500ns alarm setting and the 1PPS is enabled during non-TRAIM alarm
> conditions.
>
> The PRS10 is set for default 1PPS steering, but all of the other
> parameters are just as
> I received the unit 5 years ago.
>
> My questions are these;
>
> 1.) Should I reset the PRS10 to its Default settings or just adjust
> selected parameters to
> align the unit for proper operation with the M12+T unit? And if that is
> the case, what parameters
> need adjusting?
>
> 2.) Are there any special settings, other than what WinOncore sets, that I
> should make to the
> M12+T unit?
>
> 3.) After all this is completed, how do I know that the PRS10 is properly
> tracking GPS and
> maintaining frequency accurately? I don't have a Cesium reference, but I
> do have an un-disiplined
> LPRO-101, but I don't think that really helps me determine frequency
> accuracy.
>
> I will be adding the sawtooth correction eventually to the M12+T 1PPS
> output, but observed
> negative sawtooth with WinOncore shows +/- 14ns changes with some bridging
> occasionally.
>
> While I don't ever want to claim NIST traceability, I would like to be a
> close as possible, and I
> guess that is the bottom line need here. So what else do I need to do to
> get as close as possible?
>
> Thanks for any help.
>
>
>
>
> Jerry Mulchin
>
>
>
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