近年来随着国内科学技术和工业水平的不断发展,使用低温条件的实验室和工业部门已日益增多。这就对简便而又可靠的测量低温的方法提出了要求,特别在0～-200℃这段温度范围内要求就更为迫切。由纯铜导线和康铜热偶丝制成的铜—康铜热电偶经常使用在0～200℃的温度范围内。由于这 In recent years, with the continuous development of the domestic science and technology and industrial level, laboratories and industrial departments that use low-temperature conditions have been increasing. This is a simple and reliable method of measuring low temperature requirements, especially in the temperature range of 0 ~ -200 ℃ is even more urgent. Copper-Constantan thermocouples made from pure copper wire and Constantan thermocouple wire are often used at temperatures in the range of 0 to 200 ° C. Because of this