Erik, the PRS-10 does have provisions for changing the internal synthesizer's "ratio", which could provide a way of getting an essentially fresh start on aging. There's a big table of values somewhere in the documentation (but not necessarily in any convenient order).
My old PRS-10 is getting towards one end of its magnetic tuning range and will probably "die" in another couple of years use, but I have high expectations of winning it back via this mechanism. Have you looked into this? Dana On Mon, Jan 4, 2021 at 1:36 PM <[email protected]> wrote: > Hi all, > > The PSR10 is working now for 15 years at my place (total >25 years). > For the 1pps a Trimble Resolution T is used and has a good 1pps signal. > The Magnetic Offset MO is on the limit value of 2300 when using the 1pps > correction. > Therefore I think the unit is on end of life. I tried a factory reset to > see what will happen. > However due to the change of the TO to 1814 the unit stopped measuring the > 1pps time pulses > after 256 measurements and no 1pps measurement are possible when PL=1. > The other values are responsive. Only after a RS1 it will measure again > the pps. > My thought was due to the strange TO of 1814 (before factory reset is was > -1814) > the internal calculation is messed up. > When PL=0 the pps measurements continues but the MO is not controlled to > GPS. > I am not sure how to update the firmware. > While the unit is still stable, it has now an frequency offset of -2.7E-10 > Hz/Hz stability still is > 2.4E-12 for 20k seconds. > Probably I need another rubidium frequency standard. > > ST5 when PL=0 > 3 = PPL disabled, < 256 good 1pps inputs Provide stable 1pps inputs > > ST5 when PL=1 and when 1pps hangs > 4 = Excessive time interval (while 1pps is still good of the GPS) > > Regards, > Erik (PE1RQF) > > > > > -----Original Message----- > From: Miikka Raninen <[email protected]> > Sent: zondag 3 januari 2021 21:44 > To: [email protected] > Cc: [email protected] > Subject: PRS10 not locking to 1PPS > > > Hello Time-Nuts, > > > > I am an user of a PRS10 Rubidium standard. > > The unit has firmware revision 3.15. > > After reset to factory settings the Time Offset (TO) was set to 1814. > > Normally it was -1814. Now de PRS10 is not locking to the 1PPS anymore. > > It will freeze when PL = 1. It will freeze after 256 seconds. > > Is there a known way to set the TO back to -1814 for the firmware > revision? > > As it is a factory setting for this firmware revision. > > > > Regards, > > Erik pe1RQF (former time keeper for the Netherlands at VSL) > > Ref manual for PRS10 : > https://www.thinksrs.com/downloads/pdfs/manuals/PRS10m.pdf > > Check the quality of the input 1PPS. When the unit fails to lock on to > 1PSS input after 256 seconds it is usually due to the 1PPS being too > unstable in phase > > What do you mean by freezing? Can you check the status bytes with ST? > command? They might indicate the reason for the fault : > > ST5: Frequency Lock to External 1pps > ST5 bit Condition which sets bit Corrective Action > > 0 PLL disabled Send PL 1 to enable > 1 < 256 good 1pps inputs Provide stable 1pps inputs > 2 PLL active > 3 > 256 bad 1pps inputs Provide stable 1pps inputs > 4 Excessive time interval Provide accurate 1pps > 5 PLL restarted Provide stable 1pps inputs > 6 f control saturated Wait, check 1pps inputs > 7 No 1pps input Provide 1pps input > > You might also want to consider updating the firmware as "(Note: > Firmware revisions prior to Rev 3.23 do not allow user TO! commands. > Check the firmware revision with the ID? command)" > > - Miikka Raninen OH3GPJ > > > -- > This email has been checked for viruses by AVG. > https://www.avg.com > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
