Hi One basic question - Is the frequency high or low?
Assuming it’s an SC and on the lower turn, frequency low is possible with an off temperature oven. Frequency high is unlikely unless it’s *way* off temperature. How far off turn gives you how much delta F depends on the inflection temperature of the crystal. It matters if it’s a “true SC”or a “modified SC”….. If it is a true SC and running at 80C, that’s about 10 degrees below inflection. There will not be a lot of frequency change in that case. Many (but not all) modern crystal processes tend to age positive. If that is the case on these parts, a frequency high is the likely outcome of “age out of range”. Even with a process that has a known tendency, only about 70% of them go that direction over long periods of time. It’s not a perfect thing …. Bob > On Dec 8, 2017, at 2:34 PM, Angus <not.ag...@btinternet.com> wrote: > > > The 8601 that I have was about 2 deg C off turnover when I got it, but > I can't remember what sort or frequency error that caused. The > temperature coefficient was terrible with that error. > > Angus. > > > On Fri, 8 Dec 2017 13:05:14 +0000 (UTC), you wrote: > >> >> Gentlemen, >> We have an Oscilloquartz OCXO 8600-3that cannot any longer be adjusted into >> 5,000,000 Hz.It is about 1 Hz out of 5 MHz and turning coarse/fineadjustment >> potentiometers cannot bring the frequencyinto its specification. >> Oven temperature is about + 80C accordingto the thermistor and the operating >> voltageis at 24 VDC. >> Have Googled but the only thing that turns upis datasheets w/o any details. >> Before I take it apart and start lookingfor obviously broken components, >> isthere anyone that has a CLIP on this unit? >> 73 >> >> Ulf Kylenfall - SM6GXV >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.