The present invention described a signal conditioner. A thermocouple produces a signal that is present at a summing node input of a conditioning amplifier. The conditioning amplifier has a plurality of selectable gain values by which amplifier sensitivity may be varied to complement that of the thermocouple....http://www.google.de/patents/US4590472?utm_source=gb-gplus-sharePatent US4590472 - Analog signal conditioner for thermal coupled signals
