saidj...@aol.com said: > thanks for the info. I am wondering how accurate their SNTP server > with 1PPS RS-232 input is. Not sure how one would test that without > specialized equipment..
What sort of accuracy do you want? You aren't going to get nanosecond accuracy out of a ntp server running over an ethernet[1]. On the other hand, sub-ms isn't hard with a good OS and/or good software. It's fairly easy to get a reasonable sanity check on a (s)ntp server. Just setup a known good ntp system and have it monitor the DUT. The reference implementation for ntp (http://www.ntp.org/) has lots of support for collecting data. The key step in making a PC keep good time is tweaking the clock frequency. This is the software equivalent of the EFC on an oscillator. ntpd calls it drift. You can use it as a thermometer. ---------- 1) There is a group working on that level of accuracy. It takes special hardware that can put a time-stamp on a packet as it leaves or arrives. http://en.wikipedia.org/wiki/Precision_Time_Protocol -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.