Carl Schenck Ag

Gerhard Raffius

Juergen Pitz

Roland Sonnenschein

In a signal measuring method and apparatus, a digital signal processor (,) including a digital signal generator (,A) generates a digital signal, which is converted by a digital-to-analog converter (,) into a sinusoidal analog signal that is applied as a supply voltage to the transducers, such as load cell strain gages arranged in a bridge circuit (,). The analog supply voltage signal is modulated by the measurement voltage in the bridge circuit (,). The resulting modulated signal is amplified if necessary in an amplifier (,), and is then digitalized in an analog-to-digital converter (,) operating with a sampling frequency at least twice the carrier frequency and preferably corresponding to a whole number multiple thereof. The digital signal processor (,) carries out a Fourier transform of the digitalized signal to calculate the magnitude and phase of the measurement voltage, which may then be used for the complex calculation of zero point compensations and adjustment calibrations.

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Dreieich, Germany

Gerhard Raffius