Range of interval (or span)

In metrology, the range of the interval \([a, b]\) is the difference \((b-a)\) and is denoted by \(r[a, b]\). It also represents a static characteristic of an instrument. It defines the maximum and minimum values of the inputs or the outputs for which the instrument is recommended to use. For example, for a temperature measuring instrument the input range may be 100÷500 °C and the output range may be 4÷20 mA.

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