[time-nuts] Disciplining Rubidium

Bruce Griffiths bruce.griffiths at xtra.co.nz
Thu Apr 24 00:23:35 EDT 2008

Tom Duckworth wrote:
> Tom,
> Great list! Your number 8 (magnetic field) will effect both. We tried this
> when I was with XL Microwave. The Rb's noticeable effect depends on how
> strong the magnetic field in the physics package is compared to the external
> magnetic field. In the Rb, the external field would need to be quite strong
> to see much change in the short term. The magnetic effect, long term, would
> be swamped by thermal stability issues.
> For the xtal, orienting the xtal 90°, 180°, upside down, etc. will have an
> immediate noticeable effect that can bee seen on a scope (Earth's magnetic
> field is responsible). This effect settles rapidly though.
> Tom
> Tom Duckworth
> 510-886-1396
How do you distinguish between the effect of the earths field and the 
orientation of the XO with respect to the local gravity vector?


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