Accuracy and Resolution

The terms of accuracy and resolution are defined internationally.

Accuracy

Accuracy is the degree of fit between the measured and right value, meaning the difference between the measured and the ideal position.

Resolution

Resolution describes the smallest measurable increment for the measurement system. In an incremental measurement system, is describes the smallest difference in position. For many absolute systems, the resolution is expressed in the number of bits, meaning how many 2 to the power of x positions can be discerned.

Precision

Precision is also known as repeatability. The precision is the maximum difference of different measuring results, if a tester uses a predefined testing procedure multipe times to achieve the same position.