[time-nuts] 10811 crystal orientation

[Bob Camp]

Hi

I think that if you dig into it, you will find that there is a  
polarized light process to orient the blank before the base plate is  
applied.

Unfortunately for the discussion at hand, the direction of maximum G  
sensitivity is still random relative to the mount.

Bob
KB8TQ

On Jul 8, 2009, at 7:06 PM, Rick Karlquist wrote:

> Remember that the SC cut is doubly rotated, so the crystallographic
> axes are tilted relative to plane of the blank.  These angles are
> published in papers on the SC cut and controlled to extremely tight
> tolerances (a few seconds of arc).  However, the 10811 crystal
> package is free to rotate to any random angle, so the
> crystallographic orientation of a 10811 crystal would only be
> consistent if the production line proactively installed them
> in a certain orientation.  I don't remember ever hearing about
> anyone paying attention to how the crystals were oriented,
> in all my years of dealing with the 10811.  If it were important,
> knowing how HP did things, the crystal package would be indexed
> so that the orientation would not be up to the whim of the
> assembler.
>
> Rick Karlquist N6RK
>
>
>
>
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