Characteristics of measurement systems

Characteristics of measurement systems

•The system characteristics are to be known, to choose an instrument that most suited to a particular measurement application.

•The performance characteristics may be broadly divided into two groups, namely ‘static’ and ‘dynamic’ characteristics.

•Static characteristics

•The performance criteria for the measurement of quantities that remain constant, or vary only quite slowly.

•Dynamic characteristics

•The relationship between the system input and output when the measured quantity (measurand) is varying rapidly.

Instrument systems are usually built up from a serial linkage of distinguishable building blocks.

The actual physical assembly may not appear to be so but it can be broken down into a representative diagram of connected blocks.The sensor is activated by an input physical parameter and provides an output signal to the next block that processes the signal into a more appropriate state.

A fundamental characterization of a block is to develop a relationship between the input and output of the block.All signals have a time characteristic.It is essential to consider the behavior of a block in terms of both the static and dynamic states.The behavior of the static regime alone and the combined static and dynamic regime can be found through use of an appropriate mathematical model of each block.

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