Chapter 15. Scaling and Calibration
The task of a data-acquisition program is to determine values of one or more physical quantities, such as temperature, force, or displacement. This is accomplished by reading digitized representations of those values from an ADC. In order for the user, as well as the various elements of the data-acquisition system, to correctly interpret the readings, the program must convert them into appropriate “real-world” units. This obviously requires a detailed knowledge of the characteristics of the sensors and signal-conditioning circuits used. The relationship between a physical variable to be measured (the measurand) and the corresponding transduced and digitized signal may be described by a response curve such as ...
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