Thursday, February 19, 2009

Accuracy, Precision, & Calibration

Accuracy: The difference between the expected value of a sensor's output and the actual value of the quantity being measured. The mean of a set of data is related to the accuracy of the data.

Precision: The variations in a measured signal due to noise or other phenomena. The standard deviation of a set of data is a measure of the precision.

Calibration: Calibration improves the accuracy and precision of a sensor by defining a mathematical relationship between what you measured and what the reading should be. For example, the third plot above could be improved by subtracting a constant from the measured temperature. This would be one type of calibration.

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1 comment:

Unknown said...

The difference between the expected value of a sensor's output and the actual value of the quantity being measured. The mean of a set of data is related to the accuracy of the data. PT878 rental

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