[time-nuts] Mains as time-reference
Tom Van Baak
tvb at LeapSecond.com
Wed Dec 29 19:01:46 UTC 2010
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" <magnus at rubidium.dyndns.org>
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
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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