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INA190: 检测微安级别电流

Part Number: INA190

您好,我想用INA190A2进行微安级别的电流测试,比如输入电流5uA,输出1V的电压,然后我选择了4000Ω的采样电阻,但是实际测试时,输出电压为0,请问原理图是否有问题,谢谢