[Boatanchors] Dc Voltmeter Calibration

[Ray, W4BYG]

Thanks to Heinz and others who responded to my maybe trivial query.   
Your comments were appreciated.

The Wiki page indicates a Weston cell deteriorates at 80 micro volts per 
year,  which in this case after shaking it up a bit (it sat for many 
years), measures a corrected 1.0178 volts on a very good Tektronix DVM, 
for an .0008 volts difference.  This translates to about being 10 years 
old, which may be a better indicator of when I picked it up.

Now that and about 2 bucks will get me a cup of coffee today.
73,
Ray, W4BYG

I'm no longer young enough to know everything and a failing memory isn't 
helping any!


On 2/14/2016 7:37 PM, Heinz Breuer wrote:
> Hello Ray,
> you have a Weston cell. Nominal voltage is 1.018638V.
>
> <https://en.m.wikipedia.org/wiki/Weston_cell>
>
> vy 73 Heinz DH2FA, KM5VT
>
> Von meinem iPhone gesendet
>
> Am 15.02.2016 um 01:24 schrieb "Ray, W4BYG" <w4byg at att.net 
> <mailto:w4byg at att.net>>:
>
>> 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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-- 
I'm no longer young enough to know everything!