[Boatanchors] Dc Voltmeter Calibration

frank frank at k5dkz.com
Tue Feb 16 19:46:01 EST 2016


I would hesitate trusting WIKI information as being authoritive or accurate.  My understanding is that anyone with a computer and internet access can modify WIKI data.

I am not impying that the information in the posting below is in error.  I don't know and I don't care.  I am suggesting that data obtained from a WIKI source needs to be inspected for accuracy.

On Mon, 15 Feb 2016 18:32:17 -0500
"Ray, W4BYG" <w4byg at att.net> wrote:

> 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!
> 
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-- 
73,  Frank



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