[time-nuts] Helium and MEMS oscillators don;t mix well

Hal Murray hmurray at megapathdsl.net
Thu Nov 1 14:40:16 EDT 2018


kb8tq at n1k.org said:
> Helium leak testing is a *very* common thing in the oscillator industry. I’d
> bet it also is done in the  MEMS oscillator business as well.

How does that test work?

It seems obvious how to test stuff that is designed to hold Helium - put the 
Helium in and sniff the surrounding air to see if any leaks out.  But how do I 
test a small package to see if any leaks in?

Maybe give it a chance to leak in for a while and then see if any leaks out?


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