| 摘要 |
PURPOSE:To obtain a burn-out circuit for exerting no influence on an analog input signal at a normal time, by inserting a resistance with a value being equal to an equivalent resistance of a signal source side, onto a signal line, constituting a bridge of an existing high resistance and a newly added high resistance, and offsetting a deviation voltage. CONSTITUTION:In a burn-out circuit 2A formed by connecting a series circuit of a DC power source E and the first resistance R1, between signal lines La, Lb for inputting a signal voltage from an analog signal source, the second resistance r2 is inserted and connected in series in the signal line La of the side of a point A, and also to the side being reverse to the signal source against the point A. Also, the third resistance R2 is connected between the end of a non-A point side of the resistance r2 and a point C, and bridge is constituted so that the product of the resistance r1 and R2 which have viewed the signal source side from both the points A, B becomes roughly equal to the product of the resistance R1 and r2, by which a deviation voltage DELTAV at a normal time becomes about '0'. Accordingly, a circuit 2A for exerting no influence on an analog input signal at a normal time can be obtained.
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