Hi Again, since it’s a Kalman, even the people who designed it were a bit unclear about just what was going on inside. Was 0.1C data useful vs 1C ?…. nobody really knew. Based on many measurements of the TC of the DAC / Ref on the TBolt, it could indeed use some “help” when in holdover.
One would *guess* that when the lower resolution chips came along the units still passed the 100% holdover testing and they moved on. Bob > On Dec 9, 2019, at 12:17 AM, Charles Steinmetz <[email protected]> wrote: > > Didier and Bob both suggested that perhaps the Tbolt's Kalman filter is > better served by the "other corner of the board" temperature data supplied by > the existing DS1620, and was designed to operate that way. > > If this were true, we would expect Tbolts with newer DS1620 chips (chunky 1C > temp data) or defective DS1620s (e.g., constant minimum temperature > reporting, such as -55C) to perform *VERY* differently in holdover than > Tbolts with properly operating, mC resolution DS1620s. But all indications > are that there are no such differences (and there are reams and reams of > historical data on this). > > So, I remain convinced that the Tbolt's Kalman filter operates as I described > in my last message (12/4). > > Best regards, > > Charles > > > _______________________________________________ > 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. _______________________________________________ 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.
