Hi Did I miss part of the data?
The plot I got shows about 9 minutes. Temperature step stress takes a *long* time to settle out. Bob On Dec 19, 2012, at 9:56 PM, [email protected] wrote: > Not sure about that, if you look at the frequency plot after ~20 minutes in > moving air the frequency was still extremely close to 10.000000MHz.. to > within <1E-011 of 10MHz. This is a free-running 10811. > > Compare that to the plot of the OCXO I had sent out some hours ago when it > was running stable inside the foil - there was almost no average frequency > change between the two tests. > > If the heaters had an issue keeping average crystal temperature stable, > then the frequency would have changed from the first plot to the last plot I > would think. In my opinion the airflow is just adding a huge bunch of heater > control loop noise to the output stability, or there are components on the > PCB which are very sensitive to the airlfow. Consider that this unit and > it's PCB was designed to live inside the 53132A (very close to the fan) that > I am now using as an air source. One thing this tells me: the fan in the > counter could be disabled and it would improve the units stability, if one > keeps an eye on internal counter temperature. > > bye, > Said > > > In a message dated 12/19/2012 18:42:08 Pacific Standard Time, > [email protected] writes: > > I think the data shows that the heaters were losing ground, which would > explain the steadily falling temp of the SC cut quartz. > > Thomas Knox > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
