Campbell Scientific CR200 Operation Manual - Page 187
A.2 Concepts
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Appendix A. Glossary A.2 Concepts A.2.1 Accuracy, Precision, and Resolution Three terms often confused are accuracy, precision, and resolution. Accuracy is a measure of the correctness of a single measurement, or the group of measurements in the aggregate. Precision is a measure of the repeatability of a group of measurements. Resolution is a measure of the fineness of a measurement. Together, the three define how well a data acquisition system performs. To understand how the three relate to each other, consider "target practice" as an analogy. FIGURE. Accuracy, Precision, and Resolution (p. 13) shows four targets. The bull's eye on each target represents the absolute correct measurement. Each shot represents an attempt to make the measurement. The diameter of the projectile represents resolution. Figure 53: Accuracy, Precision, and Resolution The objective of a data acquisition system should be high accuracy, high precision, and to produce data with resolution as high as appropriate for a given application. 13
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