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长期以来,校准400℃～800℃范围铠装廉金属热电偶(以下简称“铠装偶”)使用的恒温设备多采用普通管式炉,但在满载情况下校准时,多次测量得到的重复性达到0.79℃～1.20℃,实验标准差0.30℃～0.42℃,测量不确定度1.5℃～1.6℃。其中,在400℃点测量不确定度为1.5℃,对于判定铠装偶的等级显然不够。针对这个问题,笔者进行了一系列实验和研究,提出了改进
For a long time, the thermostats used for calibrating the low-temperature metal-sheathed thermocouples (hereinafter referred to as “armor dipoles”) in the range of 400 ° C.-800 ° C. are mostly ordinary tube furnaces, but when calibrated at full load, Repeatability of 0.79 ℃ ~ 1.20 ℃, standard deviation of experiment 0.30 ℃ ~ 0.42 ℃, measurement uncertainty of 1.5 ℃ ~ 1.6 ℃. Among them, the measurement uncertainty at 400 ℃ is 1.5 ℃, which is obviously not enough to judge the grade of armor. In response to this problem, the author conducted a series of experiments and studies, put forward improvements