Lecture+2+-+Signals+-+Calibration.pdf

Calibration relationship between voltage and actual

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I Have a Signal, Now What? Calibration Relationship between voltage and actual measurement Function that must be found Accuracy dependent on other measurement method More data → better accuracy Voltage -orce +,xtrapolation 0nterpolation F(x) = Gain * ( V(x) - V Offset ) V±x² ¹ -±x²
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Matlab
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Calibration Calibration Process (Determine Input/Output Relationship) Find the Offset Voltage Determine Linearity Find the Gain What if I have an unknown mass (cart)?
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I Have a Signal, Now What? Voltage -orce Load Mass ±g° Voltage ±V° a ² ³ No Cart ²´²²#8 b ² ³ Cart ²´$9µ¶ c ¶²² ³ Cart ¶´"7µ¶ d · 5² ³ Cart ·´$9$9 e ¸²² ³ Cart ¸´µ"7$9 ±a² .'(0N (#$ - º V rio ±b²±c²±d²±e² “Fake” Zero Force = Mass Cart Actual Calibration Function
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I Have a Signal, Now What? Voltage -orce Zero -orce .'(0N (#$ - º V rio Unknown Mass )*art Mass Force = Gain * ( Voltage - Offset_Voltage ) Measure Gain separately from Offset_Voltage Incorrect Offset “Fake” Zero Force = Mass Cart Actual Calibration Function Load Mass ±g° Voltage ±V° a ² ³ No Cart ²´²²#8 b ² ³ Cart ²´$9µ¶ c ¶²² ³ Cart ¶´"7µ¶ d · 5² ³ Cart ·´$9$9 e ¸²² ³ Cart ¸´µ"7$9 Offset_Voltage
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