[time-nuts] 10811 crystal orientation

Magnus Danielson magnus at rubidium.dyndns.org
Thu Jul 9 12:40:45 UTC 2009


iovane at inwind.it wrote:
> I have another reading key.
> When the manufacturer publishes the specs of its crystals, it
> alrady took into account all of the possible known variables, 
> some of them very tiny such as dependences on orientation 
> (which do exist), so freeing the assembler (and the end-user)
> from caring of.
> 
> (Anyway, on the issue of dependence on orientation, I feel
> the standpoint of this group is a bit superficial. I would 
> suggest a test. Those of you who have GPSDO or cesium and are
> tracking the control voltage, please try rotating your 
> oscillator, and make the voltage trace available to the 
> group).

Since the gravitational/acceleration sensitivity is a vector property, 
it should not be hard to make a few measurements to establish this 
vector sensitivity for a number of oscillators and see if there is a 
good correlation or not. I have enougth 10811s on the bench that I could 
test with (8 would be sufficient to get some indication). The turn-over 
test needs to be done over all three axis. So top/bottom turn, 
long-side/long-side turn and short-end/short-end turn.

The crystal blank is mounted parallel to the top and bottom sides BTW.

Cheers,
Magnus



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