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DAC161P997,高低温变化,输出电流漂移问题如何解决

Other Parts Discussed in Thread: DAC161P997, DAC8830

环路供电的 两线制变送器, DAC161P997外部用三级管是BCX56-16江苏长电的,  20欧姆电阻用的是 10PPM,0.1级的,   常温效验完4和20mA 两个点, 低温-20℃, 在看4mA 和20mA,  发现4mA 漂移最大10uA,   20mA 漂移最大20uA ,     如何解决漂移问题?