http://www.pa4tim.nl/?p=2141. My saturated cells, so you can compare them. I think you have unsaturated ones because saturated ones can not be transported and must be kept in an oven. Most unsaturated cells have a limited lifetime, i read around 10-20 years.
Fred PA4TIM Op 30 nov. 2012 om 08:15 heeft WB6BNQ <[email protected]> het volgende geschreven: > Hi Ed, > > The type of cell you have is an UNsaturated type. These types are portable. > The > saturated type of cells are non-portable and very temperature sensitive > requiring > the use of a constant temperature enclousure. > > Here is a web site that describes these devices that is quite good: > > http://conradhoffman.com/stdcell.htm > > > Bill....WB6BNQ > > > > ed breya wrote: > >> I just junked out a very beat up old Fluke 803 differential >> voltmeter, and found deep within, an old-school Cd/Hg standard cell. >> It was well protected in an aluminum box, and wrapped in foam and >> foil. It looks brand-new, and still measures around 1.018... V. I'd >> like to keep this one as another reference point if it's still good. >> I assume that it just wasn't used much, or that the Fluke circuits >> were very good at not loading it down. >> >> I'm sure it is the original unit installed in the instrument - marked >> 5/12/1960. It is a Muirhead D-845-C. There's no test voltage tag or >> any other info but a serial number. >> >> So, I'm wondering if a 52 year old standard cell can still be OK, and >> if anyone knows the specs on these, or where to find the info. I >> don't know if it's possible, but I'd like to find what the official >> voltage was supposed to be to a few more digits resolution. I think >> various types and brands each had slightly different nominal voltages >> around that determined by the basic chemistry. I remember in the old >> days, every one I saw included a sticker with the 25 deg C exact >> voltage measured as accurately as possible back then against the NBS. >> I'd like to especially know if this is a saturated or unsaturated cell type. >> >> Ed >> >> _______________________________________________ >> 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. > > > _______________________________________________ > 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. _______________________________________________ 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.
