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
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:
Hi,
Well from that site the tempco is about 5 microvolts per degree, and from the
bottom of the page:
The un-saturated cell should have an e.m.f. of 1.0190 volts @ 20°C when new.
When the voltage drops to 1.0183 volts, the
cell should be discarded, as it is no longer stable. Most
