How do silver oxide cells compare to mercury cells for voltage stability? When I last looked into this, I concluded that there were two different silver oxide chemistries with a slight variation in voltage between them.
On Sat, 11 Mar 2017 09:21:02 -0800, you wrote: >Hi Chris: > >I think it was my Heathkit VTVM that said to get a fresh AA battery and use it >as a 1.52 Volt standard to calibrate the >meter. An even better way was to use a Mercury coin cell since they were 1.35 >volts and very stable. They were used for >light meters and voltage references because of the very flat discharge curve. > >But when you are looking for many more digits of accuracy/precision then a >battery may not be the best choice since >pretty much everything will cause a variation. Maybe in order of importance: >temperature, atmospheric pressure, >humidity, impedance of measuring equipment, &Etc. > >There are a few low cost voltage standards available where the maker has an HP >3458. For example by Geller and Malone: >http://www.prc68.com/I/MTE.shtml#DCVR > >The care and feeding of chemical standard cells is such a pain and they are >inferior to the modern electronic standards >so they have become obsolete. The label on my Eppley shows 5 digits (4 >printed and the last hand written). Note since >there's liquid involved there is also an "Up" direction. >http://www.prc68.com/I/Eppley.html#Standard_Cell > >http://www.prc68.com/I/Fluke332B.html _______________________________________________ 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.
