[Dclug] [Ma-linux] "Time"

Przemek Klosowski przemek at jazz.ncnr.nist.gov
Mon Aug 25 16:34:57 EDT 2008


   The funnier thing is that the clocks in most computers are actually
   pretty crappy.  A $5 wristwatch may well keep better time than your
   computer does. 

As I always point out, the wristwatch has the benefit of a
well-regulated constant-temperature environment (your wrist). Unless
sick, human body temperature is well within 0.5 degrees Celcius,
whereas a typical crystal might have a temperature coefficient of 20
ppm/C, which gives around 2 seconds per day per degree C.  A typical
computer's internal temperature might vary by 10 degrees, so few
minutes per week error is not out the question



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