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在使用AFE4400测心率的时候，会混入50Hz工频干扰，要去除50HZ工频干扰，那么采样频率是不是要设定为100Hz以上，但是AFE4400的采样频率有的在100Hz一下。
工频干扰 那就跟周围环境因素有关, 切断干扰的途径才是好办法.
