| 摘要 |
PURPOSE:To adjust a zero point completely automatically within a short period by controlling the outputs of the zero point rough adjusting circuit and a zero point fine adjusting circuit by a microcomputer to compensate the zero point of a weighing machine. CONSTITUTION:An output signal from a rough adjusting D/A converter D1 is sent to a terminal B of a rough adjusting subtractor 51 through a level shifting circuit 13 to calculate A-B and the subtracted result is inputted to the terminal C of a fine adjusting subtractor 52 through an amplifier alpha1. On the other hand, the output from a fine adjusting D/A converter D2 is inputted to the terminal D of the circuit 52 through a level shifting circuit 14. The output of the circuit 52 is inputted to an A/D converter 8 through one of sample holding circuits 61, 62 and the output of the converter 8 is inputted to a weight monitoring microcomputer 15. The input signal is stored in a RAM16 as the zero point of each weighing machine. A microcomputer 17 for combining operation reads out the weight of each commodity which is weighted by each computer from the RAM16 and selects the optimum combination for a set point.
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