On 05/02/2012 10:03 PM, Azelio Boriani wrote:
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.
Considering the M12+T PPS noise, you won't need anything stellar. A
PICTIC II will do just fine... or if you trust the PRS-10 readings, run
from that.
What would make this better would to use a sawtooth-correction to PPS
delay setup, as the PRS-10 measurement resolution will be about on par
with that. Would lower the effects of hanging-bridges, even if one
suffers less when dealing with a rubidium.
Adjust the PRS-10 PLL bandwidth/time-constant, the default value is most
probably not optimum, you can go further up in time. Do check the manual.
Cheers,
Magnus
On Wed, May 2, 2012 at 9:46 PM, Jerry Mulchin<[email protected]> 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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