[sdiy] Trying to establish confidence in my test equipment

[Ian Fritz]

At 09:11 AM 3/10/06, Tim Daugard wrote:
>Harry et.al.
>
> > Woah.  Can you direct me to where you read that 'volt' is a derived
> >   standard ???

It is *not* a derived standard.  Read what it says.  It is a derived 
*unit*.  In other words, as a unit it is defined in terms of  what are 
considered more fundamental units.

A standard provides a physically realized value of the magnitude of a unit.

A voltage standard is provided by the Josephson effect, which relates 
voltage to frequency via a fundamental constant:

<http://assets.fluke.com/appnotes/Calibration/Josephson-Voltage-Standard-in-a-working-Calibration-Laboratory.PDF>

   Ian