ABSTRACT
A control system consists of an integration of several components such as sensors, transducers, signal-conditioning and modification devices, controllers, and a variety of other electronic and digital hardware. In the design, selection, and prescription of these components their performance requirements have to be specified or established within the functional needs of the overall control system. Engineering parameters for performance specification, particularly for control-system components, may be defined either in the time domain or in the frequency domain. Instrument ratings of commercial products are often developed on the basis of these engineering parameters. The present chapter addresses these and related issues of performance specification.
