Weighing apparatus and method compensating for weighing errors

Abstract

A weighing method and apparatus includes a weighing cell for weighing an article and outputting a weighing signal corresponding to the weight thereof and a floor vibration detecting cell for detecting vibration of a floor on which the weighing cell is installed and for outputting a floor vibration detection signal. The weighing signal and the floor vibration detection signal are selectively sampled at a predetermined sampling frequency and an A/D converter converts each of the sampled signals into a digital weighing signal or a digital floor vibration detection signal, respectively. A first digital filter filters the digital weighing signal and a second digital filter filters the digital floor vibration detection signal. A floor vibration compensator subtracts the filtered digital floor vibration detection signal from the filtered digital weighing signal and outputs a floor vibration compensated signal wherein an error of the weighing signal caused by the floor vibration is compensated for. A phase corrector nullifies a phase difference, caused by a difference in the times at which the weighing signal and the floor vibration detection signal are sampled, by applying a suitable correction, corresponding to the phase difference, to the weighing signal or the floor vibration detection signal before or after filtering.