There is an interesting article in the Nov/Dec issue of Inside GNSS describing the robust measurement of "...voltage and current phasors at widely dispersed locations in a power grid". A Phase Measurement Unit measures and time stamps the voltage and current phasors "...thousands of times per second..." to an accuracy of <1 us using GPS. The authors discuss several strategies for dealing with jamming and spoofing of the civil GPS signals. It's a good read.
See http://www.insidegnss.com/node/4281 Mike -----Original Message----- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal Murray Sent: Wednesday, December 17, 2014 3:28 AM To: Discussion of precise time and frequency measurement Cc: hmur...@megapathdsl.net Subject: Re: [time-nuts] Simple AC mains zero-cross detector csteinm...@yandex.com said: > That one is not ideal for this task, because (i) its output pulse is > symmetrical about the mains zero cross, and (ii) the hysteresis zone > is not well characterized and will drift with temperature and input > voltage. So, there is no edge that is well characterized in relation > to the AC mains zero cross. What are you going to do with data from the line accurate to 1 microsecond? -- These are my opinions. 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. _______________________________________________ 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.