This part of GB/T 2423 provides a combination test method, mainly used for component type test samples, to determine the resistance performance of test samples under degradation under high temperature/high humidity and low temperature conditions in an accelerated manner. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. IEC 60068-1 Environmental Testing Part 1: General and Guidance IEC 60068-2-30 Environmental Testing Part 2-30; Test Method, Test Db: Alternating Damp Heat (12 h+12 h Cycle) [Environmental Testing Part 2-30: Tests Test Db: Damp Heat, Cyclic (12 h+12 h Cycle)] IEC 60068-2-78 Environmental Testing Part 2-78: Test Methods: Test Cabs: Constant Damp Heat Test (Environmental Testing Part 2-78: Tests Test Cabs: Damp Heat. Steady State) 3 General Description 3.1 Test Overview Test Z/AD is a cyclic test of temperature/humidity combination, Used to reveal the defects caused by the "breathing" effect different from moisture absorption in the test sample. This test is different from other damp heat cycle tests in that the severity level of this test is increased due to the following reasons: a) there are more temperature changes or "breathing" effects within a given time; b) The temperature cycling range is larger; c) The rate of temperature cycling is higher; Contains multiple temperature changes below o ℃. The basic characteristics of this experiment are the accelerated "breathing" and the freezing effect of water adsorbed in the gaps of the test sample. However, it should be emphasized that the icing effect only occurs when the gap is large enough to allow the attached moisture to penetrate, which usually occurs at the sealing of metal components or at the sealing of the lead end. The degree of condensation mainly depends on the thermal time constant on the surface of the test sample. For very small test samples, condensation can be ignored, but for large test samples, it is significant
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