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Instrument accuracy is called precision, also known as accuracy. Accuracy and error can be said to be twin brothers, because there is error, there is the concept of accuracy. In short, the accuracy of an instrument is the degree to which the measured value of the instrument approaches the true value, usually expressed as a relative percentage error (also known as a relative reduced error).
In engineering, instrument performance indicators are usually described by accuracy (also known as accuracy), variation, and sensitivity. Instrument workers usually calibrate instruments for accuracy, variation, and sensitivity. Variation refers to the maximum difference between the indicated values of the instrument when the measured variable (which can be understood as an input signal) of the instrument reaches the same value from different directions multiple times, or the extent to which the measured parameter changes from small to large (positive characteristic) and the measured parameter changes from large to small (reverse characteristic) with the external conditions unchanged. The difference between the two is the instrument variation.
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