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采用AMC 1200测量690VAC三相电压，输入前端用精密电阻分压，后端接运放放大至要求电压，
现在测试的过程中，发现上电空载（690V AC不上电）时，噪音很大
有没有遇到过的？
亲；你的电路有点问题。输入口需要并小阻值电阻。
