Dead time: It is defined as the time required by a measurement system to begin to respond to a change in the measurand. It is the time before instruments begins to respond after the measured quantity has been changed.
Resolution: It is defined as the smallest measurable input change. Thus, the smallest increment in input which can be detected with certainty by an instrument is its resolution or discrimination.
Range: The minimum and maximum values of a quantity for which an instrument is designed to measure is called its range.
Span: It is defined as the difference between the largest and smallest reading of instrument