Ok, it´s a relative measurement... now I understand your data. Thank you.
Daniel
Em 28/02/2013 20:03, Tom Van Baak (lab) escreveu:
Yes, correct, sometimes the power line goes faster than 60 Hz in which case the
zero-crossings occur before you "expect them"; so time error can be negative,
on average, as often as it is positive.
You cannot design a PLL that always expects phase error to be unidirectional.
The data I provided is time error relative to an ideal 60 Hz; this data can be both
positive and negative; and both gaining and losing, as well as both accelerating
and decelerating. Welcome to the interesting world of time & frequency, even at
60 Hz.
/tvb (iPhone4)
On Feb 28, 2013, at 10:42 AM, Daniel Mendes <[email protected]> wrote:
Em 28/02/2013 13:37, Tom Van Baak escreveu:
Daniel,
I've placed two log files for you under http://leapsecond.com/pages/mains/
log1932.dat.gz -- timing of every 60 Hz zero-crossing (1.296 million samples)
log97312.dat.gz -- timing of every 60th zero-crossing (21.6 thousand samples)
Each represents 6 hours of collection time. Units are seconds (elapsed time),
resolution is 100 ns, granularity is 400 ns. This data was collected with a
picPET (http://leapsecond.com/pic) using an accurate 10 MHz reference.
This isn´t very clear to me. First few lines say:
0.0000000
-0.0000029
-0.0000071
-0.0000064
0.0000027
-0.0000099
-0.0000176
Time went backwards?
Daniel
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