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咨询小电压(0-5mv)采样及INA188用法

Other Parts Discussed in Thread: INA188
输入端来自DC分流器取样75mv/300A,分流器串接于DC700V回路,要保证输入端在0-5mv以下的采样精度,前端采用精密放大器INA188将原始小信号放大20倍,后端通过隔离运放1200进行隔离。(通过继电器调节RG电阻,将增益分为2倍和20倍,保证测量范围)。
请问技术专家,这种用法是否可行,还有INA188这种接法有问题吗,特别是继电器调节增益,继电器触点电阻小于0.5欧姆。