Device and method for evaluating signals of load cells with strain gauges

The invention relates to a device for signal evaluation for load cells with strain gauges (SG), which, owing to the small output signal, require an electronic signal evaluation with very low offset-voltages. In addition, so as to be able to use cost-effect components, two different SG operating points are set in two consecutive measurements, each operating point being determined by a voltage reference. The voltage in the zero branch of the bridge circuit of the SG is amplified in a differential amplifier and digitalised using an ADC. The reference for the ADC is thus derived from the SG operating point determined by the specific voltage reference. The two measurement values are used in an arithmetic unit to determine the digitalised offset and the output value of the load cell.