What is meant by the analytical working range of an instrument?

The analytical working range of an instrument refers to the range of concentrations or values over which the instrument can provide reliable and accurate measurements. It is also known as the linear range or measurement range. Within this range, the instrument's response is proportional to the concentration or value being measured, and the uncertainty (error) of the measurement falls within acceptable limits.

In other words, when using an instrument, it is important to operate within the specified analytical working range to ensure the accuracy and reliability of the measurements obtained.