[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
More information about the time-nuts
mailing list