Bob, Pretty standard behavior for some crystals. I recently had such a jump after 150 hours. Some ocxo vendors are way more affected than others.
Nothing to worry unless it gets worse or happens more often over time. Bye, Said Sent From iPhone On Aug 31, 2013, at 10:48, Bob Stewart <[email protected]> wrote: > My OCXO is a Trimble 34310-T that I bought from a China recycler a month or > so ago. It has been very stable until this morning. At about 10:30AM my PLL > showed a large blip during one segment count (1PPS) and the DAC started > tracking upward to stabilize. Then, 745 seconds later it glitched in two > successive segments and the PLL has tracked the DAC downward well below the > old stable number. For an independent reference, I have my 8640B self-locked > inputting on Channel A of my 5335A with a large enough gate for 8 decimal > points of display. My GPSDO is serving as the time reference for the 5335A. > Give or take the stability of the 8640B, the counter seems to agree with what > my GPSDO is doing. > > This is for hobby and learning, so no big deal, but I'm wondering if this is > how OCXOs start misbehaving in their dotage (so to speak). On the one hand, > it gives me another insight into error handling for my PLL logic, which is > good. But, on the other: I'm wondering if I should just give it a proper > burial and put in my spare? Maybe I'll leave it in to see if any other error > modes develop, and then toss it when I finally have code I'm willing to > share. Anyway, is this oscillator on its last legs? I'm more worried about > letting out the magic smoke and damaging other components than I am about > accuracy at this point. > > Bob - AE6RV > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
