The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 2001
Filed:
May. 26, 1998
Carl Schenck AG, Darmstadt, DE;
Abstract
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.