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AD采集卡输入端 50Hz干扰

Other Parts Discussed in Thread: ADS1271

小弟自己做了一块AD采集卡,线路板在没有接BNC座的时候AD的输出几乎很完美了,噪声都很低。但是焊接上BNC座的时候50Hz干扰就很明显,不知该怎么解决?

BNC座如下图所示。