Signal Deviation
Quantitative differences between the actual measured range and the theoretical ideal range of a sensor signal define the accuracy of the transducer across its entire operating interval. When calculating the full-scale output span error, the technician subtracts the measured output at the minimum input from the output at the maximum input. This value is compared against the nominal span specified in the product data sheet.
Any variance indicates that the gain of the internal amplifier or the sensitivity of the sensing element has drifted from its calibrated state.
Calibration Curve
Linear regression techniques help identify where the deviation is most pronounced along the measurement scale. While a simple offset shift affects all readings equally, the full-scale output span error represents a change in the slope of the transfer function.
Thermal Influence
Sensitivity shifts are frequently caused by fluctuations in the ambient temperature of the operating environment. Internal compensation circuits attempt to nullify these effects, but residual full-scale output span error often remains after the correction is applied.
Tolerance Limit
Procurement specifications define the maximum allowable deviation as a percentage of the total range. If the measured span falls outside these bounds during incoming inspection, the sensor is typically rejected or returned for factory adjustment.
