I suppose it was to to keep the electrolyt to slam around ;-} ??? Jean-Louis Oneto ----- Original Message ----- From: "Bill Hawkins" <[email protected]> To: "'Discussion of precise time and frequency measurement'" <[email protected]> Sent: Sunday, March 15, 2009 4:24 PM Subject: Re: [time-nuts] OT: Basics of voltage calibration?
> Yes, never load a standard cell. > > It's standard practice to put a jumper across the terminals of a > galvanometer for shipping, so the needle (or mirror) doesn't slam > around. > > Some years ago, I got a standard cell from eBay. The terminals had been > shorted for shipping. > > Bill Hawkins > > > -----Original Message----- > From: Jürg Kögel > Sent: Sunday, March 15, 2009 7:36 AM > > A good reference is the old Fluke publication "Calibration - Philosophy > in Practice" > by Steve Spang. (1975) > > Be very carefull with standard cells! Never load a cell. Use the cells > only with high ohm null detectors. > A loaded cell need a long time for regeneration (or come back never to > the old value!) > > I think a good zener reference is a better practical solution for today. > > Juerg > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
