METR3613-L4 - 9/4/2007 METR 3613 - Lecture 4 METR 3613:...

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Unformatted text preview: 9/4/2007 METR 3613 - Lecture 4 METR 3613: Meteorological Measurement Systems Fall 2007 Dr. Petra Klein Lecture 4: Static Performance Characteristics Copyright 2003, Board of Regents of the University of Oklahoma. All Rights Reserved. 9/4/2007 METR 3613 - Lecture 4 Outline Static calibration Transfer plot Least square method Bias, Imprecision and Inaccuracy 9/4/2007 METR 3613 - Lecture 4 Static Calibration 9/4/2007 METR 3613 - Lecture 4 Static Calibration Typically the input is varied in a stepwise fashion over the possible range of values If there are any other input variables they are held constant (e.g. pressure calibration is done for constant temperatures) As soon as the output becomes stable, the input and output measurements are recorded This process is repeated until a transfer relation between output and input is available for the desired range Objective: Definition of instrument accuracy the reference instruments used to measure the input and output must be an order of magnitude more accurate than the calibrated instrument 9/4/2007 METR 3613 - Lecture 4 Transfer Plot 9/4/2007 METR 3613 - Lecture 4 Definition of Terms - Transfer Plot Linearity: If the data points on the transfer plot are randomly scattered around a straight line then the sensor is said to be linear The straight line is usually obtained by a least- square fit An instrument is called linear if the errors due to nonlinearity are acceptable within the required accuracy specification 9/4/2007 METR 3613 - Lecture 4 Definition of Terms - Transfer Plot Range: Measurand interval for which the sensor is...
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METR3613-L4 - 9/4/2007 METR 3613 - Lecture 4 METR 3613:...

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