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用INA333、REF200、OPA369 做的测量PT100的电路，实际测量时REF不能输出正常的电流，输出14mA的电流，电路图见附件，电源电压是3.3V，请问这个电路有问题吗，顺便问一下REF200怎么区分第一个管脚啊，没看到有什么标记，用放大镜也没看到
你的电路接的有问题吧
P3的第三脚不应该接GND吗
请参考TIDU969
