| 摘要 |
PURPOSE:To correct a deviation in the output voltage of a temperature detecting circuit due to a secular change and to accurately measure temperature by selecting an input from a reference resistance by an input switching means and adjusting the deviation of the output voltage of the temperature detecting circuit automatically by an arithmetic part and an output adjusting means. CONSTITUTION:A temperature detecting element 1 and the reference resistance 2 are connected to the input switching means 3 and switched under the command of an arithmetic part 4. When measurement is performed normally, the resistance value of the element 1 is converted by a temperature detecting circuit 5 into a voltage signal, which is outputted from a terminal 6. When the output voltage of the circuit 5 is adjusted, the means 3 is switched to the side of the resistance 2, whose voltage signal is inputted to the arithmetic part 4 and compared with the input voltage of the element 1. Then if the voltage signal deviates owing to the secular change, an output adjusting means 7 makes a fine adjustment automatically under the command of the arithmetic part 4. Consequently, invariably correct temperature measurement is performed even in long-period use.
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