3 ms·
As an engineer I like these watches because they keep time extremely accurately. The drift on mine is something like 1-2 seconds per month.
by jenny91 5y ago
As an engineer I like these watches because they keep time extremely accurately. The drift on mine is something like 1-2 seconds per month.
- jrockway 5y agoWhat oscillator are they using? Things like the DS3231 (which are temperature-compensated crystal oscillators) only do about +/- 2ppm, which is about +/- 1 seconds per week. You can tune them to do better (mine has been running at about -0.007ppm for a while), but on the tin, they appear to be worse than what you reported. (And they go to great lengths to be that accurate.) My main conclusion is that I want a watch with one of these in it: https://www.microsemi.com/product-directory/embedded-clocks-frequency-references/5570-miniature-atomic-clock-mac-sa5x https://www.microsemi.com/product-directory/embedded-clocks-...
- jenny91 5y agoI imagine the actual drift rate is normally distributed around 0 with 2 std deviations within 2 ppm or similar. Maybe I'm wrong. But I recall having not adjusted the clock for longer than a year and it only being about half a minute off. I just like to tell myself I got an accurate one out of the batch :P
- jrockway 5y ago> I just like to tell myself I got an accurate one out of the batch :P Quite possible. Also possible that they are just doing a good job!