利用英国市售碳电阻作低温温度计,在4.2K到0.3K温区研究其热循环稳定性。经过1年反复热循环,并用典型3组实验数据进行比较,发现该温度计用两参量公式拟合,精度高,且稳定性较好,其热漂移所引起的相对误差在2％左右。 Using the British commercial carbon resistance as a low temperature thermometer, in 4.2K to 0.3K temperature study of its thermal cycling stability. After one year of repeated thermal cycles and comparison with typical three sets of experimental data, it was found that the thermometer was fitted with a two-parameter formula with high precision and good stability. The relative error caused by thermal drift was about 2%.