The best reference I've found for standard cells is NBS Monograph 84:
Standard Cells - Their Construction, Maintenance, and Characteristics.
http://digicoll.manoa.hawaii.edu/techreports/PDF/NBS84.pdf
Ed
On 11/30/2012 6:00 AM, volt-nuts-requ...@febo.com wrote:
Subject:
[volt-nuts] How long can standard cells last?
From:
ed breya e...@telight.com
Date:
11/29/2012 10:00 PM
To:
volt-nuts@febo.com
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
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