Maxim sugiere el circuito que se muestra en la figura en una nota de aplicación. El amplificador operacional utilizado es el MAX430 que, en esta configuración, opera con una ganancia de 191 veces para convertir una salida de 52 uV / oC del termopar en una señal de 10 mV / oC. El coeficiente de temperatura de –2,2 mV / oC del transistor 2N3904 se suma a la unión sumatoria del circuito con una ganancia de 42,2 veces para compensar la unión fría. También contamos con la presencia del ICL8069, cuyo propósito es eliminar el offset provocado por la tensión conductora inicial de 600 mV en la unión del transistor 2N3904. El trimpot de 10 k ohms debe ajustarse para obtener una lectura adecuada con el transistor usado (2N3904) y un bloque de conexión isotérmico en el centro del rango de operación del circuito. Los valores entre paréntesis son para el caso de utilizar un termopar tipo K.

 


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