Bob: Thanks for the advice. When the unit was powered on for about three days (!) the "Not warmed up" message finally went away and it appears that the unit will now lock onto an external 1 MHz signal to within a few parts in 10E-10. This was confirmed with direct measurement using a Agilent 53132A driven with a GPS signal. At that point, things seemed to work properly and the EFC voltage was 8.2xxx Vdc. So I suspect I have a few years of EFC-voltage compliance left. I have not opened the plug to the mechanical trimmer since I regard this as a last resort -- some variable capacitors have a tendency to take a long time to settle into a new stable position after adjustment. So evidently, either I didn't wait long enough for the 2110 to properly warm up and lock onto an external signal, or something (like a leaky capacitor) "fixed itself" -- this would be more troubling. Since I don't have a feel for the "time constants" of the instrument, I may switch it off and see if it exhibits a long lock-on time the next time. But first I want to get some ADEV data to see if the unit is better than what I am currently using. I agree that the 2110 is an ancient instrument (~1968), but there are few disciplined oscillators in this class that are in economic reach to those of us that don't have deep pockets. Thanks again for your thoughts. -- Tom In a message dated 3/26/2016 9:17:29 A.M. Eastern Daylight Time, kb...@n1k.org writes:
Hi The 1150 OCXO has an EFC pin on it. The output *should* tune to both sides of 10 MHz. Since this is an old box, the OCXO may have aged far enough to keep that from happening. If the EFC is railed, it is a good bet you need to tune the OCXO with the mechanical trimmer that is behind the seal screw on the OCXO. If that trimmer is already at limit and you can’t get to 10 MHz …. not a good thing. Bob > On Mar 25, 2016, at 10:48 PM, Tom Leedy via time-nuts <time-nuts@febo.com> wrote: > > Hi -- > > I am looking for a manual for an Austron Model 2110 Disciplined Frequency > Standard (P/N 23199611-45 S/N 8085IU). This unit reports that it is not > warmed up even though the external temperature of the case of the crystal > oscillator reaches ~15 C temperature rise in a few hours as expected. The > internal oscillator is an Austron Model 1150 (S/N 4423 with frequency outputs > of 5 and 10 MHz, P/N 25299983). I believe that this request has been > posted before, but a few years ago. > > Does the oscillator, by not correctly reporting as being warmed up, > inhibit other functions? The frequency output, after a few hours, gets within a > few parts in 10E-8 on both 5 and 10 MHz. So I have faith the basic > frequency generation capability is not trashed, but I can't get many other > function to work as expected. > > Any help would be greatly appreciated for either the 2110 or the 1150 > oscillator. Feel free to contact me off list. > > Tom Leedy > Clarksburg, MD > leedyt (at) aol (dot) com > > > _______________________________________________ > 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.