GLOSSARY

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In this section we want to communicating the concepts of resolution, accuracy, repeatability and "precision". The terms 'resolution' and 'accuracy' are similar in many people's minds, but actually mean distinct things. Here at attocube we think it is important to keep these details in mind when reading and comparing specifications.

Resolution
Resolution is the ability to 'resolve' differences; that is, to draw a distinction between two things. Consequently high resolution means being able to resolve small differences.
In a digital system, resolution means the smallest increment or step that can be taken or seen. In an analog system, it means the smallest step or difference that can be reliably observed beyond noise and drift.

Accuracy
The accuracy of a system refers to how much the system, whether in measurement or control, deviates from the truth. It is important to remember the following:
The accuracy of a system can never exceed its resolution!
One reason why the resolution is in most cases better than accuracy is that often accuracy is limited by the availability of calibration standards to show or prove the accuracy.

Repeatability
Repeatability is the variance in repeated measurements on an unchanging procedure and conditions. If measured statistically, it is sometimes referred to as the noise level and drift in the measurement. In general, high repeatability means a low noise level and drift.

Precision
Precision is used in different ways by different people, so here at attocube we generally try to avoid the term. However, it is normally regarded the same as accuracy.