[time-nuts] TEC party: hardware suggestion
phk at phk.freebsd.dk
Thu Jun 30 09:05:05 UTC 2011
In message <4E0C35FF.8050201 at physik.uzh.ch>, Achim Vollhardt writes:
>how about using a small uC (PIC/AVR) clocked with 100ns instruction
>speed. Start = 1PPS from GPS, Stop = 60 Hz Edge? Use internal capture
>hardware to count processor cycles in between.
If you really want to do this:
Sample the mains signal with an ADC at around 1000kHz. Mix it
down to baseband, calculate I/Q magnitudes and use ATAN2 to find
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
More information about the time-nuts