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Old 25 June 2011, 15:53   #2136
Schoenfeld
electricky.
 
Join Date: Jun 2010
Location: out in the wild
Posts: 1,243
The accuracy of the crystal is 30ppm, which translates to an error of up to 80 seconds per month. Three minutes are easily gained or lost in two months.

You probably would not want to pay for a temperature-compensated crystal and a 2-3 week calibration period - that's what would be required if you want the accuracy of an expensive crystal-controlled wrist watch. It'll be cheaper to connect to the internet and adjust your clock using NTP every time you connect.

Jens
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