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一个正弦波信号，整流滤波后，用示波器观察，电压慢慢上升到平稳，用外用表看却看到的是乱码？不应该看到直流电压吗？试了直接电阻分压测到的电压值是对的。请问如何用万用表看滤波后得到多少直流电压，用的是直流电压档位也不行，跟实际电路相差太远啊？
