环境测试.第2-2部分:试验.试验B:干热

[中文适用范围]： 本标准涉及适用于散热和非散热样本的干热测试。对于非散热样本，测试 Bb 和 Bd 与之前的问题没有本质上的不同。干热试验的目的仅限于测定部件、设备或其他物品在高温下使用、运输或储存的能力。这些干热测试无法评估样品在温度变化期间承受或运行的能力。在这种情况下，有必要使用 IEC 60068-2-14 测试 N：温度变化。干热试验细分如下： 非散热样品的干热试验 - 温度逐渐变化，Bb。散热样品的干热试验——温度逐渐变化，Bd； – 随着温度的逐渐变化，样品始终通电，Be。本标准中给出的程序通常适用于在测试程序执行过程中实现温度稳定性的样本。 [外文原描述]： IEC 60068-2-2:2007 Deals with dry heat tests applicable both to heat-dissipating and non heat-dissipating specimens. For non heat-dissipating specimens, Tests Bb and Bd do not deviate essentially from earlier issues. The object of the dry heat test is limited to the determination of the ability of components, equipment or other articles to be used, transported or stored at high temperature. These dry heat tests do not enable the ability of specimens to withstand or operate during the temperature variations to be assessed. In this case, it would be necessary to use IEC 60068-2-14 Test N: Change of temperature. The dry heat tests are subdivided as follows: - Dry heat test for non heat-dissipating specimens with gradual change of temperature, Bb. - Dry heat tests for heat-dissipating specimens with gradual change of temperature, Bd; with gradual change of temperature, specimen powered throughout, Be. The procedures given in this standard are normally intended for specimens that achieve temperature stability during the performance of the test procedure. The main changes from the previous edition are as follows: Tests Ba and Bc have been deleted since they were more severe tests than Test Nb, IEC 60068-2-14: Change of temperature. Secondly it was considered justified to delete the 3 % value on the temperature difference between the chamber air and the wall temperatures. Thirdly it is proposed that the test specimen be powered throughout the test where required; and, finally, the annexes have been removed.