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关于TI的ADS1294的chnset寄存器问题

Other Parts Discussed in Thread: ADS1294

在ADS1294的CHNSET寄存器中将通道的增益gain设置为1时,用公式算出的采集的电压值是正确的,但是当改变通道增益gain的大小时,算出的电压值(用原来的计算电压公式除以增益)就不对了,而且误差很大,请问是什么原因????