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-200<t<0℃ Rt=R0[1+At+Bt*t+C(t-100)t*t*t] （1）
0≤t<850℃ Rt=R0（1+At+Bt2） （2）
RT is the resistance at t ℃, R0 is the resistance at 0 ℃
DIN IEC751coefficient:
A=3.9083E-3、 B=-5.775E-7、 C=-4.183E-12
Using the resistance-temperature characteristics of a particular metal.
They are expensive and are usually made of thin film.
Small size, diverse package, high precision, good linearity, low drift rate, wide temperature range.
