| 摘要 |
PURPOSE:To correct a span error generated in accordance with a difference of the acceleration of gravity of a using area simply by converting the primary integrating value of a double integration type A/D converter converting a superposed signal into a digital value by a soft timer. CONSTITUTION:The whole country is divided into 16 sections and the operating time of a soft timer in each section is stored in a memory E. A CPU5 reads out the operating time of the soft timer of a using section and turns the contact of a switch 1 to an (a) terminal and the double integration type A/D converter starts the primary integration of the output signal voltage of a weight sensor A. When the processing of steps corresponding to the prescribed operating time has been completed, the contact is turned to a (b) terminal and reverse integration (secondary integration) by reference voltage and the counting operation by a counter are started. When the output voltage of the integrator 2 reaches the original integration starting voltage, the counter 4 stops its counting operation and outputs the counted value of the total outputs to a main CPU as the counted number of outputs of the A/D converter C. |
