Hi Never rule out a bug on the EFC line. Spiders are sometimes found in odd places ….
Bob On Aug 31, 2013, at 2:16 PM, Bob Stewart <[email protected]> wrote: > Hi Said, > > Thanks for the input! I thought I had remembered someone's post about > crystal jump, but I wasn't sure. > > Bob > > > > > >> ________________________________ >> From: Said Jackson <[email protected]> >> To: Bob Stewart <[email protected]>; Discussion of precise time and frequency >> measurement <[email protected]> >> Cc: Time Nuts <[email protected]> >> Sent: Saturday, August 31, 2013 1:12 PM >> Subject: Re: [time-nuts] Caring for the elderly (OCXO) >> >> >> 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. _______________________________________________ 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.
