MOVABLE LOAD MEASURING APPARATUS

PROBLEM TO BE SOLVED: To enable accurate measurement of movable load, by recording a sensor signal value at the time of unloading, as an offset value, and multiplying a sensor signal obtained by subtracting the offset value from a sensor signal at the time of loading, by a sensor correction coefficient. SOLUTION: When a load is mounted, shearing strain is applied to load sensors 11-14, which generate voltages corresponding to the load. By selection of data input apparatus 201, a microcomputer 140 forms a load sensor change- over signal. On the basis of the signal, an analog multiplexer 110 reads a load voltage signal from one out of the load sensors 11-14, and transmits a load voltage signal VIS to a subtracter 121, which subtracts an offset value VOF from the load voltage signal VIS. This offset value is a load voltage signal which each of the load sensors outputs at the time of unloading previously recorded by a microcomputer 140. A multiplier 131 multiplies the obtained value VS by a sensor signal correction coefficient K, and outputs the corrected load voltage signal VX to the microcomputer 140, which converts VX into a load value and displays it on a display unit 200.