Patent ID: 6377180
Filing Date: 2002-04-23
Classification: G01K

Abstract:
Circuit for evaluation of a measurement signal of a thermocouple, comprising an amplifier having an input for receiving the measurement signal of the thermocouple and an output for issuing an amplified measurement signal, a microcontroller having an input connected to receive the amplified measurement signal from the amplifier as an input signal, a switch for short-circuiting the input of the amplifier during a pause in the measurement cycle, and a circuit for supplying a test current to the thermocouple during the pause in the measurement cycle, and wherein the microcontroller has a means for evaluating an input signal which is present at the input of the microcontroller during the pause of the measurement cycle, the microcontroller having a memory in which the amplified measurement signal is stored during the measurement cycle pause, and the microcontroller having a correction algorithm which corrects the amplified measurement signal using a signal stored in the memory before evaluating of the amplified measurement signal.