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紧急求助:为什么我的PGA308,放大后,最低电压1V以上?

Other Parts Discussed in Thread: PGA308

紧急求助:

1MPa的压力传感器,为什么我的PGA308,放大后,最低电压1V以上?大约1.3V左右。不管我设置放大倍数是400倍还是10倍,0MPa时,都是1.3V左右,满量程时4.5V左右。这是为什么啊?我换了另外一个PGA308,还是一样现象。这是为什么呢?