4 ms·
> Typical crystal oscillators can gain or lose seconds per day. Are you sure? I only owned a quartz watch when I was a kid, but all sources I find on the web
by rrr_oh_man 2y ago
> Typical crystal oscillators can gain or lose seconds per day.
Are you sure?
I only owned a quartz watch when I was a kid, but all sources I find on the web say even the lowest quality quartz watch movements are accurate to +- 20-30 seconds a month.
For comparison: my several decades old manual Poljot loses some seconds per day.
- AdamH12113 2y agoThe Casio G-Shock I got in the 90s was ~66 ppm fast, which worked out to ~5 seconds/day. There are cheap crystals on Digi-Key with ~10 ppm accuracy, which is around 0.86 seconds/day. But crystals drift with age (and a tiny bit with temperature). Perhaps watches have improved since I last looked, but I would want to measure the actual real-world accuracy before believing anything better than 1 second/day.
- crote 2y agoYeah, that sounds about right. Crystal oscillators typically have an accuracy of about 20ppm, which is 1.73 seconds per day. Keep in mind that those number are a guaranteed worst-case performance - real-world performance is often much better.