[Boatanchors] Dc Voltmeter Calibration

[Dave Brown]

Ray
It's a standard cell- must always measure them with a very high impedance 
voltmeter as they are not intended to ever source any current else they will 
be damaged. Google for 'standard cell'.
 Dave, ZL3FJ
 Christchurch, NZ


----- Original Message ----- 
From: "Ray, W4BYG" <w4byg at att.net>
To: <boatanchors at mailman.qth.net>
Sent: Monday, February 15, 2016 1:24 PM
Subject: Re: [Boatanchors] Dc Voltmeter Calibration


>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.  It is marked as made by 
>"Muirmead" with a number 3057_ (last digit unreadable).  There is a clear 
>fluid in the tubes.
>
> When measured at the wire ends it consistently gives 1.0169 VDC, via my 
> Tektronix DMM-916.  It measures the same year after year.  It appears to 
> be a chemically energized lab grade voltage standard.
>
> I have no recollection how I obtained this.  I've had it for maybe 25 or 
> 30 years.  Would be curious if anyone knows how it works.
> Ray, W4BYG
>>
>
>
> -- 
> I'm no longer young enough to know everything!
>
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