[volt-nuts] Eppley Standard Cell and What Is It?

[Pete Lancashire]

phil sez: Are they worth keeping ?

even if not practical, time to get out the cleaners, polish, etc. and
put it on the mantel
or other display of treasures. any {volt,time,location,etc}-nut must
have such a spot
or two.

-pete

On Thu, Sep 22, 2011 at 3:16 AM, Roy Phillips <phill.r1 at btinternet.com> wrote:
> Joe
> Interesting point regarding the "Standard Cell", I have one that was
> purchased some 12 years ago made by Western. It must be well beyond its
> calibrated accuracy. It currently reads 1.018679 volts according to my
> 3458A. It seems to be stable but below its original labeled standard (label
> lost). Are they worth keeping ?
> Roy
>
>
> --------------------------------------------------
> From: "J. L. Trantham" <jltran at att.net>
> Sent: Thursday, September 22, 2011 2:37 AM
> To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
> Subject: [volt-nuts] Eppley Standard Cell and What Is It?
>
>> I purchased an eBay item (190538109632) for the 'Standard Cell' that
>> included another item.
>>
>> What is it?
>>
>> The 'Standard Cell' is an 'Eppley Laboratory Catalog Number 100 (SN
>> 762058) Low Termperature Coefficient Standard of E. M. F.' that has written
>> on it '1.01931 @ 20 degree C' with a date of what I think is '2-4-69' which
>> I think means Feburary 4, 1969.
>>
>> Using my 'new' Solartron 7081, I read the voltage at 1.017844 +/- about 1
>> uV.  If I have the math correct, that is a decrease of about 35 uV/yr which,
>> I think, is about what is predicted for these cell's, assuming my 7081 is
>> accurate.
>>
>> I also have another Eppley Standard Cell (SN 821855) that reads 1.018709
>> but no date or prior reading on the unit.
>>
>> On another, unrelated note, I have been able to chase down the US branch
>> of Ametek in Oak Ridge, TN, and they will be getting my 7081 back to send to
>> England for calibration and 'service best effort', given that the meter
>> ceased production in 1998 with end of support 2008.  TAT is about 4 weeks in
>> England.
>>
>> Now, what is that other thing in the listing?
>>
>> Joe
>> _______________________________________________
>> volt-nuts mailing list -- volt-nuts at febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
>> and follow the instructions there.
>>
>
>
> _______________________________________________
> volt-nuts mailing list -- volt-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
> and follow the instructions there.
>