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ADS1248精度问题

Other Parts Discussed in Thread: ADS1248

各位大神,我在使用ADS1248的时候 ,发现精度不足,关键还不是线性的。在正温度范围内,实际值比理论值小10度左右,在负温度范围内,实际温度比理论值小14度左右,而已越大误差越大!在ADS1248的手册中,FSC和OFC寄存器可以校准吗?请问大概什么原理!困惑求解  谢谢各位