Calibration Error

The calibration error is inaccuracy permitted by a manufacturer when a sensor is calibrated in the factory. This error is of a systematic nature, meaning that it is added to all possible real transfer functions. It shifts the accuracy of transduction for each stimulus point by a constant. This error is not necessarily uniform over the range and may change depending on the type of error in the calibration. For example, let us consider a two-point calibration of a real linear transfer function (thick line in Fig. 2.3). To determine the slope and the intercept of the function, two stimuli, s1 and s2, are applied to the sensor. The sensor responds with two corresponding output signals A1 and A2. The first response was measured absolutely accurately, however,

 and the slope will be calculated with error: