| 摘要 |
PURPOSE:To adjust an offset voltage, drift, etc. easily by connecting switches between the input of a current to be measured and the input of a current/voltage conversion circuit and between the output of an integrating circuit and the output of a compensation circuit respectively. CONSTITUTION:The current/voltage conversion circuit 12 inputs the current to be measured and outputs a voltage corresponding to the current value. The integrating amplifier circuit 22 amplifies the converted voltage, integrates the amplified voltage and outputs a voltage corresponding to the mean value of the current to be measured. The compensation circuit 20 inputs the output voltage of the circuit 22 and compensates the offset voltages of the circuits 12, 22 and the drift of the output. When the output of the circuit 22 is applied to the circuit 20 through the switch 27, the circuit 20 compensates the offset voltages of the circuits 12, 22 and the drift. When the switch 27 is opened and the current to be measured is applied to the circuit 12 through the switch 16, the current is measured under the state that the circuits 12, 22 are compensated.
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