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    Re: Timekeeping in the post-WWV/post-HF world
    From: Peter Monta
    Date: 2018 Sep 28, 21:12 -0700
    Hi Tony,



    Does this mean if I buy a quartz watch on a flee market (which I always do) - it has already aged-in to a more horizontal/predictable curve?


    As I understand it, aging is dependent on the thermal history of the crystal.  If the wristwatch is kept in the same thermal environment for many months, it may get a little more predictable.  But going from flea-market shelf to wrist is enough of a change that any aging trends may be "erased".

    These slides from John Vig summarize crystal oscillator lore:


    Start from page 60 of the PDF for discussion of aging.

    Cheers,
    Peter

       
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