[time-nuts] Double ovened 10811-60158 on ebay

Magnus Danielson magnus at rubidium.dyndns.org
Sun Jul 20 12:39:48 EDT 2008


Rick Karlquist wrote:
> Ed Palmer wrote:
>>> If their intent was to hermetically seal the oscillator, why would they
>> leave the screw in the front that covers the adjustment hole (which
>> nobody could possibly get to!)?  Would the seal around the screw be good
>> enough to make it worth the effort to seal the rest of the unit?
>>
>> Ed
> 
> Good point.  I don't know about the hermeticity of a screw, sounds
> questionable.  It's possible the designers were kidding themselves.
> I know that I debunked a lot of their theories about what is or is
> not hermetic.  For example, "hermetic" epoxy isn't.  Possibly there
> is a Viton O ring around the screw.  I think that might be hermetic.

The question is what is "hermetical" in this context. While not strictly 
hermetical the time constant is significantly larger than the open hole.
I think it would be illuminating to discuss the effects and what would 
require strict hermetic environment and what benefits and limits a 
limited hermeticallity would result in.

Cheers,
Magnus




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