Hi It might be, if it is then an upper turn in the 80C range is not all that crazy.
Bob > On Dec 8, 2017, at 4:24 PM, Angus <not.ag...@btinternet.com> wrote: > > > That near the end of the temperature range the direction could also > give a good indication - assuming that there is only one problem... > > I think the 8600-3 is still an AT - the 8607 is SC. > > Angus. > > > On Fri, 8 Dec 2017 15:40:08 -0500, you wrote: > >> Hi >> >> One basic question - Is the frequency high or low? >> >> Assuming its an SC and on the lower turn, frequency low is possible >> with an off temperature oven. Frequency high is unlikely unless its *way* >> off temperature. How far off turn gives you how much delta F depends on >> the inflection temperature of the crystal. It matters if its a true SCor >> a >> modified SC > .. If it is a true SC and running at 80C, thats 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. Its 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. > _______________________________________________ > 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.