4 ms·
To my understanding, the grid is managed to have a fixed number of cycles per day, which would make it perfectly accurate. A cheap crystal can easily lose a few
by AdamH12113 3y ago
To my understanding, the grid is managed to have a fixed number of cycles per day, which would make it perfectly accurate. A cheap crystal can easily lose a few seconds per day. And given how hard it is to keep 60 Hz noise out of circuits, I can’t imagine the sensing would be difficult.
- ilyt 3y agoIt might be technically possible but it isn't the case any more
- Turskarama 3y agoDefinitely not true in Australia at least, grid frequency can vary by quite a lot from 49Hz to 51Hz.
- BenjiWiebe 3y agoDoes it average out to 60.0000hz over a day/week/month though? It could go that and still have lots of fluctuations.
- WJW 3y agoCertainly not 60.0000 Hz, that is a USA thing. Most of the rest of the world runs on 50 Hz.
- myself248 3y agoThe trick is that so many devices use DC power bricks now, because it outsources the UL-or-whatever compliance, and makes FCC easier too. It's much harder to sense 60Hz downstream of that.
- HPsquared 3y agoSounds like we need another addition to the USB standard! 60 Hz mode (or 50 Hz, depending on market)