如图
使用AD620和IOS124采集电流,输入电流范围+-50mA,采样电阻100欧,增益为2倍,+-15V供电。
现象为:输入50mA电流,AD620刚上电输出正常9.95V,工作约1分钟后幅值开始下降,稳定后为8.5V左右,
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