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ADS1256零点采样不准

Other Parts Discussed in Thread: ADS1256

ADS1256前级是一个0-200微安电流信号,我加一个2k电阻进行采样,当输出时0微安时,用万用表测量为0V,但是和ADS1256连接后为什么变成了一个1.7mV的信号?仿佛ADS1256无法采集2mV以下的信号啊!