2组 DAC7512+XTR116U 做2路4~20mA输出
2个DAC的地肯定是共地的
XTR116的Iret连DAC的gnd
那么2个XTR116的Iret就是连在一起的，这时 2路输出都是错的
把其中一个xtr116的Iret断开，另外一个就正常了
这是什么原因？
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