[time-nuts] Altitude Effect on Cesium Standard?
Brooke Clarke
brooke at pacific.net
Wed May 7 23:36:56 UTC 2008
Hi Tom:
I've been making some measurements of the Datum 4065 vs. GPS where the 4065 is
setting all the parameters (i.e. I have zeroed the offset and it's doing it's
thing). After some days the t/T plot looks like a straight line at about 4E13
with a couple of ns bobble.
The 4065 is at about 910 feet (280 meters) elevation. Your web page:
http://www.leapsecond.com/great2005/ says about 1.1E-16 per meter so that's
3E-14 about an order of magnitude smaller than what I'm seeing.
The 4065C manual says the accuracy is 1E-12 or 5E-13 depending on if the tube
is rated for lifetime or high performance. I assume this means without any
adjustments, i.e. power up and that's what you get.
Do you have a feel how well your Cesium standards set themselves?
--
Have Fun,
Brooke Clarke
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