Andy Pugh wrote: > Doesn't it need to be synched to mains frequency rather than absolute > time? How accurate is NTP (or even GPS time) in this context? > ... > The GPS system has atomic clocks accurate to some insane level like one second in 10,000 years. They have to periodically adjust the clocks for relativistic effects. The satellites transmit time to receivers on earth, and the time code system can resolve the broadcast time to a nanosecond - literally. Then, after solving the equations for path delay from several satellites, the position can be fixed, and so the real time on an arbitrary point on earth can be determined to great precision.
NTP is supposed to be good to well within a second, assuming any decent net connection. On the other hand, unless this generator is extremely reliable and run 24/7 constantly for months, trying to sync electric clocks to it seems a poor choice. Maybe find a good computer with a good real time clock on it and have it "broadcast" time over a serial line to remote time displays. That's what I do here, and Linux even automatically corrects the time for daylight savings time twice a year. (I also have temperature and humidity sensors, so the displays show time, date, temp and humidity at convenient locations.) Jon ------------------------------------------------------------------------------ Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! Tap into the largest installed PC base & get more eyes on your game by optimizing for Intel(R) Graphics Technology. Get started today with the Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. http://p.sf.net/sfu/intelisp-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
