On 25 Nov 2015 11:18, "Charles Steinmetz" <[email protected]> wrote: >
> I'm curious why you think the AD587/586 are better than other hermetically packaged references with better drift and noise specifications -- in particular, > > MAX6350MJA > AD588KQ > LTC6655CHLS8 > LTC6655BHLS8 > REF102CM > > (see attached table). Your table mentions at the bottom the LTZ1000, but you don't have that device listed in the table. I assume that is an oversight, but perhaps it was intensional. As regards humidity, I wonder if an reasonable attempt at sealing a package combined with silica gel inside would give an internal humidity that keeps fairly stable. I recall seeing a mix of chemicals on eBay that were a calibration standard for humidity. I assume that if one got some hermetically sealed feedthrough caps, it would not be hard to put a PCB inside a tinplate box that's soldered along each edge to form a hermetically sealed container. Then one would have a sealed environment. I can imagine it would be desirable to flush out all solder fumes before making a final seal. Maybe the flux residuals that I expect outgas over time would cause more problems than it solves. Note that I have never worked on anything requiring such sealing, so I would not be surprised if someone who has worked on such products would laugh at my suggestions! I note that Schott appear to produce hermetically sealed enclosures. I would have thought it practical to build electronics at home where changes of humidity over time could be virtually eliminated. But I have no experience in this subject. Dave. _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
