环境测试.第3-11部分:支持文件和指南.气候试验室内条件不确定性的计算

[中文适用范围]： IEC 60068 的这一部分演示了如何估计恒温恒湿箱中稳态温度和湿度条件的不确定性。由于这与测量方法密不可分，因此也对其进行了描述。本标准同样适用于所有环境外壳，包括房间或实验室。所使用的方法既适用于恒温箱，也适用于温湿度组合箱。该标准旨在帮助每个使用气候试验室的人。那些已经熟悉测量不确定度的人会发现它对于指导典型的不确定度来源以及如何量化和组合它们很有用。它还旨在帮助对该主题知之甚少或一无所知的首次或偶尔使用的用户。要讨论不确定性，首先要了解正在测量或表征的内容非常重要。室性能的校准或表征与室中空气的湿度和温度有关，正如被测物品在给定设定点所经历的那样。这不应与表征或校准腔室传感器相混淆，后者是一个单独的问题。 [外文原描述]： Demonstrates how to estimate the uncertainty of steady-state temperature and humidity conditions in temperature and humidity chambers. Since this is inextricably linked to the methods of measurement, these are also described. This standard is equally applicable to all environmental enclosures, including rooms or laboratories. The methods used apply both to temperature chambers and combined temperature and humidity chambers. This standard is meant to help everyone using climatic test chambers. Those already familiar with uncertainty of measurement will find it useful for guidance on typical sources of uncertainty and how they should be quantified and combined. It is also intended to assist the first-time or occasional user who has little or no knowledge of the subject. To discuss uncertainty, it is important first to understand what is being measured or characterized. The calibration or characterization of the performance of a chamber is concerned with the humidity and temperature of the air in the chamber, as experienced by the item under test, at a given set point. This should not be confused with characterizing or calibrating the chamber sensor, which is a separate matter.