Positioning terminology

Engineering Fundamentals

Introduction

Accuracy, repeatability, resolution and stability are terms that are often confused. This sheet provides definitions of these terms.

TermDescriptionVisual representation
AccuracyAccuracy describes how close the mean result is to the reference value.Positioning terminology Accuracy and repeatability
RepeatabilityRepeatability describes the variation between results. It is often expressed as a standard deviation.
ResolutionThe resolution of a system is equal to the smallest incremental step that can be made.Positioning terminology resolution
StabilityThe stability of a system is the deviation from a constant reference value over a long time (typically >10 seconds). When specifying the stability, the corresponding timescale has to be specified as well.Positioning terminology stability

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