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| ▲ | bhouston 2 days ago | parent | next [-] |
| Clocks do drift. Seconds a week is definitely possible. I think there are varying quality of internal clocks in electronic devices, and the cheaper the quality the more drift there is. I think small cheap microcontrollers can drift seconds per day. |
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| ▲ | ycui1986 2 days ago | parent [-] | | cheap microcontrollers use RC oscillators. If they only drift a few seconds a day, that would be an achievement by itself. RC oscillator is poor enough that early days USB communication would fail if running on RC clock. |
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| ▲ | 1970-01-01 2 days ago | parent | prev | next [-] |
| I've seen some new ThinkPads lose a minute a month and others (the old ThinkPads) keep within a second of NTP over an entire year. It depends. |
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| ▲ | layer8 2 days ago | parent | prev | next [-] |
| Several seconds per week is normal. Oscillator accuracy is roughly on the order of 10 PPM, which would correspond to 6 seconds per week. |
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| ▲ | soared 2 days ago | parent | prev [-] |
| I have an extremely cheap and extremely low power automatic cat feed - it’s been on 2 D batteries for 18 months. I just reset it after it had drifted 19 minutes, so about 1 minute a month, or 15 seconds a week! |
