Weighing apparatus

A weighing apparatus for measuring loads comprising, a weighing platform for receiving a load to be weighed, a movement connected to said platform, said movement including at least one vibrating string and an exciting and sensing head coacting with the string for vibrating the string transversely and sensing the frequency of vibration, an evaluating device receiving the frequency signal from the head and converting the signal to one for driving a digital indicator, said movement including a plurality of mechanical members that are unadjustable and therefore incapable of compensating for any errors inherent therein, said evaluating device including a plurality of arithmetic components and a plurality of arithmetic logic units for introducing constants into the arithmetic components for adjusting the relationship between calibrated weights and the frequency signals generated by said weights to calibrate the apparatus for obtaining the correct weight measurements at the digital indicator, said arithmetic logic units corresponding to the addition of n terms (a.sub.0, a.sub.1, f, . . . , a.sub.n f.sup.n) of a polynomial of the nth degree, where the independent variable is the frequency signal representing the weight measurement and the dependent variable is the unknown measured value of the load and the magnitude of the n coefficients (a.sub.0, a.sub.1, a.sub.2, a.sub.3) of the terms of the polynomial is equal to the n constants.

A weighing apparatus for measuring loads comprising, a load receiving member, a movement for converting the force of a load on said member to a frequency signal wherein the magnitude of the frequency signal is a function of the magnitude of the load, said movement being unadjustable and therefore incapable of compensating for any errors inherent therein, a digital indicator for indicating a digital weight measurement of a load on the load receiving member, and an evaluating device connected between said movement and said digital indicator having a plurality of arithmetic components computing a weight measurement signal for the digital indicator, and means for calibrating the components to compensate for any errors in the movement to obtain accurate measurement of weight at said indicator of a load on the load receiving member including a plurality of adjustable arithmetic logic units feeding calibrating constants to the components, said components and units coacting in accordance with a polynomial equation G = a.sub.0 +a.sub.1 f+a.sub.2 f.sup.2 +a.sub.3 f.sup.3 +. . . a.sub.n f.sup.n, where G equals weight, f equals the frequency signal and a.sub.1, a.sub.2, a.sub.3, a.sub.n equal the calibrating constants, and means connected to said calibration means sensing conditions affecting the accuracy of a weight measurement and compensating for same be adjusting said calibration means.