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

In message , Wayne Holder writes: >The curious thing to me is that some iPhones are said not to recover from >exposure to helium but, as an essentially mechanical device, I can think of >no reason that the SiT1532 would not recover from exposure to helium after >the gas had migrated

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

In message <04055a33-5f2b-8aff-f9b0-526c9478d...@earthlink.net>, jimlux writes: >> To get to relevant He levels via the Radon route, we are talking >> deep unventilated mineshaft kind of concentrations... >> >> Hydrogen is a lot more plausible in my view. > >Yeah, but in concentrations

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

Hi As much fun as this is, once it moves over to wireless charging as the likely issue ….. that’s getting pretty far from TimeNuts main focus….. Bob > On Nov 1, 2018, at 5:08 PM, David Witten wrote: > > Ok, one last try: > > From AuntMinnie.com, free but subscrip[tion-based newslettter for

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

Hi If you take an IC package up to fairly high pressure for a few hours (and it’s defective) you can pretty well fill it with helium and have it well above 1 ATM internal pressure. It will then leak out (maybe over a few years) until it gets back down to one atmosphere internally. In some

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

Hi Now, getting back to the original issue. MEMS oscillators of some types have really tiny structures in them. They mount them as close to being in “free space” as they can. The idea is no different than a crystal. A properly shape lump running in free space has higher Q. Higher Q is normally

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

Please pardon my usual incompetence posting to mailing lists... 2nd MRI center reports problems with Apple devices Aunt Minnie is a newsletter/site targeting clinical radiologists and technical staff. Dave

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

kb...@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

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

On 11/1/18 8:52 AM, Poul-Henning Kamp wrote: In message , Bob kb8tq writes: A lot of Radon and *really* poor ventilation…. Yup. But a LOT of Radon is not without interesting "side-effects", such as much easier ionization due to the alpha radiation. To get to relevant He levels via

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

In message , Bob kb8tq writes: > A lot of Radon and *really* poor ventilation…. Yup. But a LOT of Radon is not without interesting "side-effects", such as much easier ionization due to the alpha radiation. To get to relevant He levels via the Radon route, we are talking deep

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

Hi A lot of Radon and *really* poor ventilation…. There are a lot of ways for He to show up. In normal use, issue is hanging on to it. It tends to run away from its source very quickly. Maintaining a measurable concentration in something like a normal room …. not very easy at all. Bob >

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

In message , "Richard (Rick ) Karlquist" writes: >According to Jack, radon emits alpha particles, AKA helium nuclei. >These capture stray electrons and become helium atoms. So the >presence of helium is a marker for radon. The fact that the half >life is a few days supports this

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

This reminds me of a Jack Kusters (of HP fame) anecdote. He left HP for a while to work for Ephratom on Rb standards. Some customer was raising hell about their Ephratom Rb standards having lousy accuracy. Jack had them send some of the "defective" units back to the factory, and the units were

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

I just came here to post that same link. Very interesting bit of hardware detective work. On Wed, Oct 31, 2018 at 12:51 PM Mark Sims wrote: > https://ifixit.org/blog/11986/iphones-are-allergic-to-helium/ > ___ > time-nuts mailing list --

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

https://ifixit.org/blog/11986/iphones-are-allergic-to-helium/ ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.