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AFE4300关于测量体重的问题

Other Parts Discussed in Thread: AFE4300

本人使用AFE4300芯片实现人体体重测量问题。但是在实验过程中发现即使只有托盘(Load Cell),但是经过AFE4300芯片出来的数值大小转换为质量也有5Kg(用MCU实现)。但是输入AFE4300的INP1、INM1端口的电压差却为0.想问一下此时是AFE4300芯片内部DAC转换等导致的误差吗?就算我通过OFFSET寄存器来调零,那么换一个AFE4300芯片后OFFSET是不是又得不一样了?