One of your references links to a nice real time graph for UK :)
http://www.nationalgrid.com/uk/Electricity/Data/Realtime/Frequency/Freq60.htm
I've looked to see if Red Eléctrica de España, the equivalent
organisation here, provides same data... but nothing interesting to
time-nuts, only electrical production and demand graphs (and a very
politically correct graph of corresponding estimates of CO2 emissions).
Regards,
Javier
El 29/12/2010 20:01, Tom Van Baak escribió:
Magnus,
See fellow mains measurement men:
http://www.xs4all.nl/~rjoris/gridfrequency.html
http://www.vf.utwente.nl/~ptdeboer/misc/mains.html
http://www.leapsecond.com/pages/mains/
/tvb
----- Original Message ----- From: "Magnus Danielson"
<[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Wednesday, December 29, 2010 10:45 AM
Subject: [time-nuts] Mains as time-reference
Fellow time-nuts,
Just for fun I have been looking at the mains as a time-reference.
I've used an OSA 8600 as reference and divided down to PPS by a
TADD-2. While not absolute time reference, it is way quieter than the
mains so I think it is good enough to have some fun at least. Just to
illustrate the issue.
I use a HP5335A to measure the time from PPS to rising edge of 50 Hz
as being accessible through a transformer.
The ADEV has a peak at 30 s measuring 2,3E-4 and another at 6000 s
measuring 4,3E-4.
The phase changes over -0.11923 to +10,979 so a time difference
peak-to-peak of 11,098 seconds.
While I could refine my measurements to ensure trigger jitter is not
causing any major issues, the ADEV slope from 1 s is rising rather
than lowering, so it rather seems like source behaviour dominates.
While this attempt is a hack, I hope it inspires people to fiddle
around a little. :)
Cheers,
Magnus
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