| 摘要 |
PURPOSE:To improve operability and weighing accuracy, and by absorbing zeropoint variation of a load converting section containing a loadcell and automatically correcting the zero-point. CONSTITUTION:To a converting section 1 for a load G, a sqaure wave of a constant period is continuously supplied from an oscillator 5, and the converted output is sent to a zero-tracking circuit 6. When a weighed value which is the output of an 1//N circuit 9 reaches within a prescribed range, the square wave, from the osciallator 5 is supplied to a counter 13. When the weighed value does not meet the balancing condition at this time, the output of a judging section 12 is reveresed and the counter 13 is reset. Moreover, when the weighed value is continuously within a prescribed range for n+1 times and meets the balancing condition, a memory 7 is updated by an instruction for execution C. Consequently, when the zero-point varies or the weighing is performed, the counter 13 is set to the reset condition by outputs of judging section 11 and 12, and, therefore, zero-trackings is made quickly and adequately against zero-point variations due to the creep of the converting section 1, variations in the temperature, or variations in the moisture. |
