一、热电特性引起的误差热电偶的热电特性将随其成分、微观结构及残余应力大小而变化。即使同一型号的热电偶,它们的E-t关系也不一致。各种热电偶都是在一定的误差范围内与相应的分布表符合。此种误差虽可通过检定的方法加以修正,但应指出,修正只是补正分度表与实际E-t间的偏差,不意味着完全消除了热电偶的误差,至少还具有上一级标准热电偶的传递误差。二、热电偶不均匀引起的误差均匀的热电偶产生的热电动势,只与测量端、参 First, the error caused by the thermoelectric properties Thermocouple thermoelectric properties will vary with the composition, microstructure and residual stress. Even the same type of thermocouple, their E-t relationship is not the same. All kinds of thermocouples are within a certain range of error with the corresponding distribution table. Although this error can be verified by the test method to be amended, but it should be noted that the correction is only to correct the deviation between the index table and the actual Et does not mean that the complete elimination of the thermocouple error, at least with a standard thermocouple Pass the error. Second, the thermocouple caused by uneven uniform thermocouple thermoelectromotive force generated only with the measurement side, reference