
clearly specified value to which reference is made in order to define the fiducial error NOTE 1 - This term is used in the 'true value' approach. NOTE 2 - This value can be, for example, the upper limit of the measuring range, the scale length or any other value which is clearly stated.
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=311-01-16

A specified value to which reference is made in order to specify the accuracy of the transducer. For transducers the fiducial value is the span. For transducers having reversible or symmetrical outputs the fiducial value can be either the span or half the
Found on
http://www.youngco.com/young2.asp?ID=4&Type=3
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