Which term describes the accuracy of measurements across an instrument's operating range?

The term that describes the accuracy of measurements across an instrument's operating range is linearity. Linearity refers to the ability of an instrument to provide measurement results that are directly proportional to the actual value of the quantity being measured throughout its entire range. This means that the difference between the measured value and the true value remains consistent and predictable across the range of measurements.

When assessing linearity, typically calibration curves are created to determine how well the instrument performs at various points in the range. An ideal instrument exhibits linearity, ensuring that as the measurement increases, the readings remain accurate and the relationship can be portrayed as a straight line.

Understanding linearity is crucial for quality control and assurance in testing environments where precise measurements are essential. Ensuring an instrument is linear helps maintain the integrity and reliability of the data collected in various applications.