[time-nuts] Thunderbolt temperature measuring

Mark Sims holrum at hotmail.com
Sun Jul 26 22:37:09 UTC 2009


>From my poking and prodding,  I think the temperature sensor serves two purposes.  First as an environmental alarm.  Second as compensation for temperature effects on the system as a whole.  As such,  you want it near where it was.  Sticking it on the oscillator would mask a lot of the ambient temp changes that it is making adjustments for.

Another thing to consider is the difference in the thermal mass / time constant of a DIP package and the SO-8 package.  The DIP will respond more slowly to temperature changes.  It is not known how that might affect the oscillator disciplining algorithm.

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