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ADS1292R电压偏移

Other Parts Discussed in Thread: ADS1292R, ADS1292

想请教
我们自己做了一块ADS1292r电路板
未与控制器作连结加入输入
PGA1PPGA1N量测到约200300mV的的直流电压
PGA2PPGA2N量测到约700〜800mV的的直流电压
请问这是正常的现象吗
谢谢