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 -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
