Proficiency testing on calibration by comparison of platinum resistance thermometers (PRTs) among several calibration laboratories in Korea was conducted. The challenges faced in organizing this proficiency testing were the required wide temperature range (from − 196 °C to 650 °C) and the large number of participants (43). Maintaining the stability of the test items was key to achieving the goal of proficiency testing because the uncertainty of the reference value should be considerably smaller than the uncertainty of the participants’ calibration. For the proficiency testing, four PRTs that meet the criteria specified in the International Temperature Scale of 1990 were used as test items and were circulated among the four groups into which the participants had been divided. The PRTs were calibrated at fixed points between the triple point of argon (− 189.3442 °C) and the freezing point of aluminum (660.323 °C) before and after circulation to the participants, and the PRTs where checked for stability at the mid-point of the circulation. It was possible to maintain the expanded uncertainty of the reference value to less than 18 mK, for which the instability of the test items was a dominant factor. It was found that among the 322 calibration points, 35 calibration points (11%) resulted in normalized error (|E_n|) > 1. The number of participants who had at least one calibration point with |E_n|> 1 was 15 (35%).

通过在韩国多个校准实验室之间进行铂电阻温度计（PRT）的比较，进行了校准的能力验证。组织此能力测试面临的挑战是所需的宽温度范围（从-196°C到650°C）和大量参与者（43）。保持测试项目的稳定性是实现能力验证目标的关键，因为参考值的不确定性应比参与者校准的不确定性小得多。对于能力验证，将四个符合1990年国际温度标度规定的标准的PRT用作测试项目，并在参与者分为四个组中进行分发。在将PRT循环到参与者之前和之后，在氩的三点（− 189.3442°C）和铝的凝固点（660.323°C）之间的固定点进行校准，并检查PRT在中点处的稳定性的流通。可以将参考值的不确定度扩展到小于18 mK，这是测试项目的不稳定性是主要因素。发现在322个校准点中，有35个校准点（11％）导致归一化误差（| 测试项目的不稳定是主要因素。发现在322个校准点中，有35个校准点（11％）导致归一化误差（| 测试项目的不稳定是主要因素。发现在322个校准点中，有35个校准点（11％）导致归一化误差（|E _n |）> 1.至少有一个校准点的参与者的数量| E _n |> 1为15（35％）。