selgelt määratletud väärtus, mille alusel arvutatakse mõõtemääramatuse suhteline väärtus, clearly specified value to which reference is made in order to define the fiducial uncertainty, clearly specified value of a quantity to which the uncertainty(ies) of an instrument and/or an accessory are referred in order to specify their respective accuracies, clearly specified value to which reference is made in order to define the fiducal unceratainty, fiducial value used for reference is the measured value of the leakage current