I'm not quite sure what the question is here, but when we made 10811 oscillators at HP, "jumps happened". Some crystals were better than others, but no crystal was immune from jumps. With good quality crystals, you might be able to put an upper bound on the magnitude of jumps, like 10-9, but not on the time between jumps. I also noticed that there didn't seem to be any correlation between jump activity and stability between jumps. You could have an oscillator with really low aging, say a few parts in 1E11 per day that looked really good for quite a while, but then the frequency jumps. After you've controlled everything you can about the crystal process, the electronics, the oven and the environment, you are still left with jumps. If you want no jumps, go to an atomic standard like rubidium. There are mechanisms that can cause jumps in rubidium standards as well, but good rubidium standards don't jump.
Rick Karlquist N6RK [EMAIL PROTECTED] wrote: > I would be very pleased to know when (date and time) anybody > out there happened to record jumps in frequency of crystals. > I have stable (e-07) tuning forks which happen to jump too, > and I don't understand why, even having under control > temperature and air pressure. Sometimes they return to their > prior frequency with another jump, and this could happen even > days later, sometimes they jump and then recover smoothly the > prior frequency in a short time (such as one hour). > I have no idea whether any correlations would exist between > crystals and tuning forks jumps, regarding the causes that > could trigger metastability, and hence I would have a look at > crystal data in order to improve the base for future > speculation. > > Thanks in advance. > Antonio I8IOV > > > > _______________________________________________ > 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.
