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INA827: 放大倍数

Guangfeng Wei
Prodigy 100 points
Part Number: INA827

下图中3.25V和2.5V之间被测阻抗为1M欧姆左右。INA827放大倍数G不对，只有R24上压降达30mV以上时，G才会正常；R24上压降越小，G偏大得越多。请问是什么问题？