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最近遇到一个问题，在做opa820电压反馈放大试验时，我把输入端和输出端的触头同时接到输入端时 ，输入交流信号的幅度会变小，拿起来就是正常的，我接的是同向电压反馈。求解？
用啥方法测的输入信号？信号源是啥？内阻多大？
示波器测的输入信号，，信号源是100mv，3kHz的正弦交流信号。。
