ERRORS ASSESSMENT BY STATIC CALIBRATION Sample Clauses

ERRORS ASSESSMENT BY STATIC CALIBRATION. The following calibration recommendations mainly come out of two reference documents from ITTC Procedures and guidelines. Document [1] gives work instructions to calibrate force sensors, to assess the different sources of errors (linearity, hysteresis, repeatability, influence of the temperature, creep, stability of sensitivity). Methods for the evaluation of instrument calibration uncertainties are described in [2]. These guidelines are used for static calibration of any kind of sensor (load cell, wave gauges, pressure sensors, capacitive water elevation probes…). In particular, they recommend that: - The sensors are calibrated before and after each test campaign in order to detect any possible damage during the tests. - A traceable reference with known uncertainty is used for the calibration. It can be certified calibrated masses for load cells or a reference displacement sensor regularly checked by a certified metrology laboratory. - Several cycles of loading and unloading of the sensor are performed, with five to ten equally incremented data points within the measuring range. - Each data point corresponds to a 3 second acquisition time at 100Hz. - For each data point, the mean value is used for errors linear regression and errors calculations. - For each data point, the standard deviation is checked as a measure of the instrument noise. - A linear regression analysis is carried out with all the acquired data points to determine the slope, intercept and residual. - Errors are calculated with the following formulas: where: Linearity: L = ∆8L × 100 (%FS) 8n Hysteresis H = ∆8K × 100 (%FS) 8n Repeatability H = ∆8R × 100 (%FS) 8n 8n: Sensor output ∆8L: Maximum value of the deviation between the mean advance calibration curve and the straight line of two mean end points. ∆8K: Maximum value of the deviation between the return mean calibration curve and the advance one. ∆8R: Maximum value of the deviation of the sensor ouput for each reference point Examples of static calibration results can be found in appendix 1.
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