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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