[volt-nuts] How long can standard cells last?

Fred Schneider pa4tim at gmail.com
Fri Nov 30 07:31:03 UTC 2012


http://www.pa4tim.nl/?p=2141. My saturated cells, so you can compare them. I think you have unsaturated ones because saturated ones can not be transported and must be kept in an oven.
Most unsaturated cells have a limited lifetime, i read around 10-20 years. 

Fred PA4TIM

Op 30 nov. 2012 om 08:15 heeft WB6BNQ <wb6bnq at cox.net> het volgende geschreven:

> Hi Ed,
> 
> The type of cell you have is an UNsaturated type.  These types are portable.  The
> saturated type of cells are non-portable and very temperature sensitive requiring
> the use of a constant temperature enclousure.
> 
> Here is a web site that describes these devices that is quite good:
> 
> http://conradhoffman.com/stdcell.htm
> 
> 
> Bill....WB6BNQ
> 
> 
> 
> ed breya wrote:
> 
>> I just junked out a very beat up old Fluke 803 differential
>> voltmeter, and found deep within, an old-school Cd/Hg standard cell.
>> It was well protected in an aluminum box, and wrapped in foam and
>> foil. It looks brand-new, and still measures around 1.018... V. I'd
>> like to keep this one as another reference point if it's still good.
>> I assume that it just wasn't used much, or that the Fluke circuits
>> were very good at not loading it down.
>> 
>> I'm sure it is the original unit installed in the instrument - marked
>> 5/12/1960. It is a Muirhead D-845-C. There's no test voltage tag or
>> any other info but a serial number.
>> 
>> So, I'm wondering if a 52 year old standard cell can still be OK, and
>> if anyone knows the specs on these, or where to find the info. I
>> don't know if it's possible, but I'd like to find what the official
>> voltage was supposed to be to a few more digits resolution. I think
>> various types and brands each had slightly different nominal voltages
>> around that determined by the basic chemistry. I remember in the old
>> days, every one I saw included a sticker with the 25 deg C exact
>> voltage measured as accurately as possible back then against the NBS.
>> I'd like to especially know if this is a saturated or unsaturated cell type.
>> 
>> Ed
>> 
>> _______________________________________________
>> 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.



More information about the volt-nuts mailing list