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.
