Hi Rob, thanks for your email. My take is you want your standards and calibrated equipment to last very long due to increasing stability, and that is in direct opposition to making them out of fragile materials, even if they don't get thrown around. Accidents happen, people trip over, this can't really be helped. I'm no metrology expert by any degree, it just seems to me that making it even easier to break your $250k box is a bad idea if it can be wholly avoided by using a different material that'll meet requirements too.
You're right that it's not unheard of - ceramics were even used in mobile testing equipment eg by tek - but they didn't know better back then, or they didn't care because equipment would be phased out before it had chance to break. On Fri, 7 Apr 2017 22:32 Rob Klein, <rob.kl...@smalldesign.nl> wrote: > In general, metrology equipment doesn't get thrown about much ... > > I know some calibrators have (heated) modules on ceramic substrates, so > it's not that it is completely unheard of. > > > > Met vriendelijke groet, > Rob Klein > > verstuurd vanaf mijn smartphone > > Op 7 apr. 2017 20:12, om 20:12, cheater00 cheater00 <cheate...@gmail.com> > schreef: > >Hi Attilla, > >My #1 worry would be fragility. > > > >On Thu, 6 Apr 2017 06:39 Attila Kinali, <att...@kinali.ch> wrote: > > > >> Moin, > >> > >> I recently wondered, why people around voltage metrology hardly > >> talk about ceramic substrates (Al2O3, AlN, ...) for PCBs. > >> They have surface resistivity that is as high as PTFE, have > >> higher thermal conductivity, lower thermal expansion (AlN is > >> even pretty close to Si). So, why then does it hardly ever get > >> mentioned? Is it the cost of those? Or is there something I am > >> missing? > >> > >> Attila Kinali > >> > >> -- > >> You know, the very powerful and the very stupid have one thing in > >common. > >> They don't alters their views to fit the facts, they alter the facts > >to > >> fit the views, which can be uncomfortable if you happen to be one of > >the > >> facts that needs altering. -- The Doctor > >> _______________________________________________ > >> volt-nuts mailing list -- volt-nuts@febo.com > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > >> and follow the instructions there. > >> > >_______________________________________________ > >volt-nuts mailing list -- volt-nuts@febo.com > >To unsubscribe, go to > >https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > >and follow the instructions there. > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
