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当测量温度中使用电阻式温度检测器，励磁电流本身这个温度产生I 2r，或焦耳热化，产生一个比指示温度稍微高一点的温度标准。
When measuring temperature using an RTD, the excitation current itself produces I 2r, or Joule heating, producing an indicated temperature somewhat higher than the temperature being measured.
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