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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN1711 датащи(PDF) 33 Page - STMicroelectronics |
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AN1711 датащи(HTML) 33 Page - STMicroelectronics |
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33 / 40 page  33/40 SOFTWARE TECHNIQUES FOR COMPENSATING ST7 ADC ERRORS Figure 21. Illustration of calibration 4.2.7 Calibration for Errors using 2 different zones We can extend the technique mentioned above to do 2-zone calibration. This is required be- cause of the linear distribution of errors from offset error to mid-voltage and then from mid- voltage to gain error as shown in Figure 22. Figure 22. Calibration for 2 zones In addition to approximate Offset and Gain errors we need to calculate the error around the center of the analog voltage range. A small voltage range around mid-voltage is to be ignored Recorded value Calibrated value VSSA 1023 Digital output (Decimal steps) Actual transfer curve Ideal transfer curve Vin Ideal range Gain error (negative) Offset Error (positive) 509 517 **Graph not to scale uncalibrated range |
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