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PGA970: 关于负方向和0位点的问题

Part Number: PGA970


你好,我现在用PGA970自己做的板子,5线的LVDT传感器,2个差分返回信号分别接到PGA的S1的2个输入端,能够得到正确的幅值数据,但是只有正向没有负向,而且没有0位点,请问该怎么解决,谢谢