Patent ID: 7668693
Filing Date: 2010-02-23
Classification: G01D

Abstract:
1. A method of evaluating uncertainty associated with a value of a measurand derived from measurements of a device under test, said method comprising: selecting sources of uncertainty associated with at least one of (i) the measurement of at least one physically observable quantity, (ii) the measurement of a reference value of a reference device, and (iii) the measurement of the value of the measurand; providing a mathematical model wherein the measurand is expressed as a function of (i) said at least one physically observable quantity, said at least one physically observable quantity being associated with at least one source of uncertainty in the measurement of the device under test and the measurement of the reference device, and (ii) the reference value in the reference device, measuring the reference value of the reference device and the value of the measurand of the device under test, measuring the value of said at least one physically observable quantity, and determining with a computer at least one uncertainty value as a function of said at least one physically observable quantity from said mathematical model, wherein said mathematical model takes into account the at least one source of uncertainty and the reference value of the reference device.