[SOLVED] OCXO frequency variations due to pressure

[shashy.br]

Hi all , i am using a 30MHz ocxo for my application of local oscillator ,
kindly let me know if there will be any frequency variations due to the pressure changes on the OCXO,
let us say 3 times the normal pressure (3 Bar is am correct)...
please let me know if there are any calculations regarding this topic...
thanks a lot for ur time ....

 

[chuckey]

The crystal is normally in an evacuated can. So more pressure, more deflection on the can and the stray capacity will increase, so the frequency might drop. I don't think by very much, parts per 10^8 ? The same thing could happen to any component, which is air sealed with epoxy or such like. It could be advantageous to allow the kit to acclimatise for a day or two before its used, if not the frequency could suddenly jump as the can collapses (just a bit ).
Frankk

 

[shashy.br]

Hi thanx a lot for the reply....
So even if i choose a through hole component instead of a connectorized one ,i need to acclimatise the component the same way?
and is there any calculation for the shift occuring due to pressure change?