Hi, On 2019-08-01 08:50, Tom Van Baak wrote: > An email came in asking if it was possible to improve the performance > of a TCXO if one monitors the temperature of the PCB or enclosure and > then applies timekeeping corrections in s/w based on that data. I > don't have specific P/N or other details so treat this as a generic > question. Has anyone tried this?
I had intended to do exactly this, but never got around to, since I didn't have to. We put a hood over the oscillator, but the temperature readings where really useful in that process. That ended up being good enough for our needs, the time-errors accumulated over a shift reduced to 1/3. There will be possible to make some improvements, but there is limitations to how well you can do it. You probably want to do a least-square fit to some model. You want to look at the residuals from actual and square-fit response in order to see when you hit the limit of the model. The residuals will never be white noise only which is what you would get as a success. Crystals is temperature gradient sensitive, so once ability to compensate that is somewhat limited. Depending on the quality of the TCXO, it's match may be more or less good. It's for the less good that you can get improvements. The drift behaviors is what end up being hard for a simple TCXO to compensate for, where as we will see it drift after a temperature step. It will for sure be one of the limits. There is more subtle differences. Cheers, Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
