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XTR101 变送 PT100 温度不正确

Other Parts Discussed in Thread: XTR101PT100 0°到100°是 100Ω到138.5欧姆 ,我设定R4为100欧姆,RS为97.6欧姆 ,负载电阻100欧姆,但是变送出来不对,现象是 我用6位半台表测量pt100为110欧姆左右,温度应该是24度左右,但是出来是30,而我用一个可调电阻调节到110欧姆出来的温度就是24左右,为啥有这样的现象?