[time-nuts] Still looking for a maual for an Auston 2110 Disciplined Frequency Standard
Hi: If anyone has a manual for an Austron 2110 Disciplined Frequency Standard, I would be interested in a copy. Please feel free to contact me off-list. This is a really cool instrument that locks the frequency of its internal ovenized crystal oscillator to an external standard having superior long-term stability. Many thanks Tom Leedy Clarksburg, MD 20871 ___ 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] Looking for IEEE-488 codes and formats for Datum 9700AT Programmable Time System
Hi: I am looking for the IEEE-488 codes and formats for a Datum 9700AT Programmable Time System. The 9700AT is a 1U time generator and translator with slots in the back that can accept option cards with various functionalities such as -488 and RS-232 interfaces, GPIO, and tape searches. What I need is the character strings to output the time for the -488 interface. The manual for the unit is here: http://www1.symmetricom.com/media/files/support/ttm/product-manual/man-9700at-9710.pdf However, it is silent on the details of the -488 interface. Any help would be appreciated and feel free to contact me offline. Many thanks! Tom Leedy Clarksburg, MD ___ 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] An atomic clock used to measure the height of a mountain
Hi: By comparing the tick rate of the portable atomic clock on a mountain with a similar clock in a lab in Torino, Italy, researchers at Germany’s National Metrology Institute showed that the altitude difference between the two locations was about 1,000 meters, or 3,280 feet. Their work was published in Nature Physics. A related article here. Best -- Tom Leedy - Clarksburg, MD ___ 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.
Re: [time-nuts] Time-nut going England!
Hi: A very worthwhile, and often overlooked, museum is located at The Worshipful Company of Clockmakers (1 Throgmorton Avenue, London EC2N 2BY, Telephone: 020 7998 8120). It is not very large, but has some unusual objects including many of the tools that were used in making clocks. Their Web site is: http://www.clockmakers.org/ Tom Leedy Clarksburg, MD ___ 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.
Re: [time-nuts] Owner's Manual and advice for Austron 2110 Disciplined Freque...
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.
[time-nuts] Owner's Manual and advice for Austron 2110 Disciplined Frequency Standard
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.
