dmend...@gmail.com said: > No, just designing a very wicked PLL and needing statistics of the > frequency derivative... No generator is involved, it´s mains frequency (but > you gave me another idea... thanks!).
There is a lot of noise on the line. I'm not sure if frequency makes sense on a cycle to cycle basis. Two suggestions: With a transformer and a few resistors, you can feed the line into the audio input on a PC. Then you can search for zero crossings, run it through a filter, feed it to a FFT... You can also feed the line into a modem control signal on a PC serial port. (USB probably won't work.) The PPS logic from NTP will count cycles and record a timestamp on the last one. -- 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.
