[volt-nuts] HP 3458A DC current accuracy

Will willvolts at gmail.com
Fri Jul 13 07:30:43 UTC 2012

The 1990 Josephson constant 2e/h is just an approximation which means
that the "Josephson Volt and Ohm" are not exactly the same as the SI
Volt and Ohm.

No practical quantum Ampere so far?

2012/7/12, Mike S <mikes at flatsurface.com>:
> Apropos: http://www.sciencedaily.com/releases/2012/07/120711101042.htm
> With regard to the discussion, since in the SI, Amps are the base unit,
> Volts are derived from Amps, and Ohms from Volts - remarkable that Amps
> are the least realizable in practice? (I guess it's just the difference
> between NIST and everyone else)
> --
> Mike
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