| 摘要 |
<p>A weighing apparatus comprises a weighing cell (2) for weighing an article to be weighed and outputting a weighing signal corresponding to the weight thereof and a floor vibration detecting cell (4) for detecting vibration of a floor on which the weighing cell (2) is installed and for outputting a floor vibration detection signal. The weighing signal and the floor vibration detection signal are selectively sampled (8a) at a predetermined sampling frequency and a single A/D convertor (8b) converts each of the sampled signals into a digital weighing signal (W) or a digital floor vibration detection signal (F) respectively. A first digital filter (28) filters the digital weighing signal and a second digital filter (30) filters the digital floor vibration detection signal. A floor vibration compensator (34) subtracts the filtered digital floor vibration detection signal from the filtered digital weighing signal and outputs a floor vibration compensated signal wherein error of the weighing signal caused by floor vibration is compensated for. A phase corrector (26) 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 modification, corresponding to the phase difference, to the weighing signal or the floor vibration detection signal before or after filtering. <IMAGE></p> |
