[time-nuts] More 60 Hz graphs
hmurray at megapathdsl.net
Fri Sep 16 00:14:17 UTC 2011
Was: Subject: Re: [time-nuts] 60hz west coast electric grid gone berserk
albertson.chris at gmail.com said:
> What? Lets assume 80 characters per line at 60Hz that word to a whopping
> 4800 bytes per second. For a modern desktop computer moving even a million
> bytes per second is trivial. Even 10 times that much is easy. In the 1/
> 60th second between cycles a simple desktop computer can execute well over a
> hundred million instructions.
Thanks for the poke.
The obvious thing to do was try it. So I collected a half-hour of data.
Things are more interesting when you have data for every cycle (as compared
to every 10 seconds).
Here is the offset from 60 Hz:
Here is the frequency:
I don't know where the wobbles are coming from. They might be in my
Here is the step-size between samples:
The row at 30+ ms is where the collection system couldn't keep up and missed
The top row is where it missed 3 samples.
This is zooming in, ignoring the missed-sample cases:
Note that the dots that are not part of the main line/blob come in pairs, one
above and one below. I think that means one sample was late, so the previous
step is long and the next one is short.
These are expanded to show only 2 minutes:
These are zooming in on the step size:
The horizontal bars are because I've rounded off to a microsecond someplace.
These are zooming in on the offset:
The downward spikes are a delayed sample. The upward spikes are "early"
samples. I assume it got lucky and the cache didn't get flushed or something
Here is a histogram of the step size:
This is a better view of the stuff along the bottom:
Looks like 5-10 microseconds RMS of noise. That's on a laptop that wasn't
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