Hi LH can get a bit confused about OCXO tempo. It's not really the software's fault, as you point out - the data just isn't there.
Bob On Dec 14, 2012, at 5:36 AM, Charles P. Steinmetz <[email protected]> wrote: > tvb wrote: > >> do either of you have actual tempco numbers? > > I checked my notes and found that I did not record any free-running tempco > values. My observations were based on the scale factors I had to use to get > the temperature and DAC graphs in Lady Heather to overlay each other. I > initially noticed it because there was a very pronounced tracking of the two > graphs for one Tbolt and for the other two there was not (the > temperature-compensating component of the DAC voltage is mostly lost in the > noise). I had checked the actual EFC sensitivity of each oscillator in the > vicinity of the operating point, so all relevant variables were more or less > controlled. > > My impression is that the better ones are comparable to a single-oven 10811, > maybe even a bit better. LH typically reports tempcos of 1e-12/C to 1e-11/C. > My worse unit (and, from what I can infer from LH plots posted to the list > and on-line, it appears many others as well) typically reports a tempco of > 1e-10/C to 1e-9/C. Of course, the LH numbers are all to be taken with some > caution since LH does not have any a priori means to separate tempco and > drift. > > Best regards, > > Charles > > > > > > > > > > _______________________________________________ > 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.
