| 摘要 |
PURPOSE:To provide a voltage-measuring circuit wherein even when a leakage of current occurs between a solution to be measured and the ground, a reference electrode is hardly influenced by the leakage. CONSTITUTION:A voltage difference operation means 4 having a reference voltage input terminal 41 and a measured voltage input terminal 42 receives a measured voltage signal from a sensor 5 and a reference signal from a reference electrode 1 and operates a difference voltage between the measured voltage and the reference voltage. In the voltage reference operation means 4, the reference electrode 1 connected to the reference voltage input terminal 41 is not connected to the ground but a dummy electrode 2 is provided to be connected to the ground. |
