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ADS1294: 抑制工频干扰的问题

Part Number: ADS1294

我司用ADS1294作为双通道肌电采集,为提高输入阻抗,前端加了仪表运放AD8222  100倍放大以后单端传给ADS1294,详细电路附后

测量结果是,在室内办公环境下,工频干扰较严重,不接RLD电极的话根本测量不了信号,加了好了很多但还是干扰比有用肌电差模信号小不了多少,但在室外就基本满足使用要求。个人怀疑是RLD放大器增益设置不够,导致未能完全抵消工频干扰。请指导如何解决