A self-calibrating sensor system is disclosed wherein a processing circuit, normally including an amplifier, receives the output of at least one sensor to develop a processed sensor signal. To compensate for errors (gain error, etc.) in the processing circuit, the preferred embodiment includes a microprocessor...http://www.google.de/patents/US4800513?utm_source=gb-gplus-sharePatent US4800513 - Auto-calibrated sensor system
