Text: The ratio of the error to the full scale output, or the ratio of the error to the output expressed as a percent. Also, the capability of an instrument to follow the true value of a given phenomenon. Often confused with inaccuracy, which is the departure from the true value into which all causes of error are combined, i.e., hysteresis, nonlinearity, drift, temperature effects and random errors. While this definition is unique, the word "accuracy" is often incorrectly used as a synonym for repeatability.

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