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INA128

两级放大    第一级放大6倍     第二级放大16倍    信号源输入2v电压   示波器显示第一级放大只有5.2倍   第二级放大测不出来   当两级一起测试是  放大了10倍左右

 不知道出现了什么问题  求解决