METHOD FOR CALIBRATION OF SENSOR OUTPUT VOLTAGE ERROR IN ACCORDANCE WITH OUTPUT VOLTAGE TOLERANCE OF POWER

摘要

A method for calibrating error of sensor output voltage according to the error of power output voltage is provided to calibrate the sensor output voltage automatically by storing a calibration value to a memory linked with a CPU and referring to the stored calibration value. A CPU receives reference voltage through a communicator and stores the reference voltage to a non-volatile memory(S101), and the CPU receives power output voltage of a power supply unit from a voltage measurer(S102). The controller calculates a voltage difference between the power output voltage and the reference voltage, and calculates calibration data by using the voltage difference as a variable(S104). The CPU calculates an average of the calibration data by repeatedly calculating the calibration data(S105). The CPU stores the average calibration data to the non-volatile memory106. The CPU reads the average calibration data from the non-volatile memory. The CPU receives sensor output voltage from a sensor unit and generates sensor data by converting the sensor output voltage into a digital signal. The CPU calculates a value of sensor data by using a conversion formula using the average calibration data and the sensor data as the variable.