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Is it necessary to perform post-calibrations after deployment in the field?

April 26, 2017deployment field necessary perform

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Is it necessary to perform post-calibrations after deployment in the field?

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For wind energy applications, post-calibrations are recommended for cup anemometers deployed for turbine performance testing. According to IEC 61400-12-1, “The cup anemometer shall be calibrated before and recalibrated after the measurement campaign. The difference between the regression lines of calibration and recalibration shall be within +/- 0.1 m/s in the range 6 m/s to 12 m/s. Only the calibration before the measurement campaign shall be used for the performance test.” With a post-calibration, one would have a better understanding of the consistency or the relative change in the sensor output after its deployment.