Mettler-waagen Gmbh

Karl-Heinz Kusmenskji

Harald Beck

A weighing cell, in which the weight forces of the load are compensated by deformation or electromechanical forces, includes a load carrier which receives the load, a mechanical-electrical load-measuring cell, and an acceleration meter which experiences the same vertical accelerations as the weighing cell. The load cell and the acceleration meter are connected electrically with one another such that the measuring signal which is adulterated by the acceleration action is corrected correspondingly. The load cell has an output signal (A+a) comprising a weighing signal (A) superposed by a spurious signal (a) due to such acceleration. A subtractor receives the output signal (A+a). The output signal of the acceleration meter is balanced to a value (a'). In one embodiment, a multiplier receives the balanced signal (a') and from the subtractor receives a weighing signal (A) from which said spurious signal (a) has been cleaned, the multiplier producing a signal corresponding to the spurious signal (a) and feeding it to the subtractor. In another embodiment, the additive weight-force component is balanced in the signal (a') and the signal (a') is fed to the subtractor. The output of the acceleration meter is also balanced to form a second signal (a') in which the multiplicative weight-force component is compensated. This second signal (a') is fed to a second subtractor, to which a reference voltage also is fed. An analogue-digital converter receives the outputs of both subtractors for producing the cleaned output signal (A).

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Pohlheim, Germany

Karl-Heinz Kusmenskji