On 10/30/18 3:50 AM, Adrian Godwin wrote:
How sensitive to atmospheric environment are MEMs oscillators ?
https://www.reddit.com/r/sysadmin/comments/9si6r9/postmortem_mri_disables_every_ios_device_in/
It gets closer to time-nuts territory in the earlier discussion - see
captaincool's contribution some way down :
https://www.reddit.com/r/sysadmin/comments/9mk2o7/mri_disabled_every_ios_device_in_facility/
The helium leak sounds a bit sketchy, especially when you're talking
about a system that has large RF and magnetic fields. Why would a MEMS
resonator care about what gas it is surrounded by.
That said, I recall someone telling me about problems with early MEMS RF
switches and needing some trace amount of water vapor to make them work
- work fine on the bench, but them into thermal vacuum testing and after
some amount of time they stop working, as the H2O diffuses out of the
(non-hermetic) packages.
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