[Boatanchors] Dc Voltmeter Calibration

[revcom at wbsnet.org]

I have in my test equip 'stash' an Eppley Laboratory, Inc 'Standard Cell'
Cat. No. 100.  States internal resistance not over 500 ohms.
Marked voltage is -1.019320V-
Neat item.

Rod
KØEQH



> “I have in my curio of parts an unmounted device that consist of two
> connected sealed glass tubes, pointed on the ends and with a red and a
> black wire coming out of the opposite bases...When measured at the wire
> ends it consistently gives 1.0169 VDC...It measures the same year after
> year.  It appears to
> be a chemically energized lab grade voltage standard....Would be curious
> if anyone knows how it works.
> Ray, W4BYG”
>
> It is probably a Weston cell.  Weston cells were used as laboratory
> voltage standards when I took a course in chemical instrumentation, many
> decades ago.  Never put anything but a very high resistance load on it, or
> it will be permanently damaged.  It may also contain mercury and cadmium
> compounds.  If ever broken, clean up with care!  Google Weston cell for
> details.
>
> Gary, K-zero-CX
>
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