[time-nuts] Trimble Tbolt temperature

[Didier Juges]

The only controlled experiment I am aware of was run by Mark Sims in March
2009 and he measured a 100% difference in PPS change per hour between the
old chip and the new chip in holdover in the same Thunderbolt. Big enough
to be statistically significant.

febo.com/pipermail/time-nuts/2009-March/036831.html

Didier


On Mon, Dec 9, 2019, 1:45 AM Charles Steinmetz <csteinmetz at yandex.com>
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
>
>
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