GB/T 2423.34-2012 English PDF (GBT2423.34-2012)

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GB/T 2423.34-2012: Environmental testing - Part 2: Test methods - Test Z/AD: Composite temperature / humidity cyclic test
GB/T 2423.34-2012
Environmental testing.Part 2. Test methods.Test Z/AD. Composite temperature/humidity cyclic test
ICS 19.040
K04
National Standards of People's Republic of China
Replace GB/T 2423.34-2005
Environmental testing - Part 2. Test methods
Test Z/AD. temperature/humidity combination cycle test
Environmentaltesting-Part 2. Testmethods-TestZ/AD. Composite
(IEC 60068-2-38.2009, Environmental testing-Part 2-38. Tests-
TestZ/AD. Compositetemperature/humiditycyclictest, IDT)
Released on.2012-12-31
2013-06-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Content
Foreword I
1 range 1
2 Normative references 1
3 General Description 1
3.1 Test Overview 1
3.2 Application of the test 1
4 description of the test chamber 2
4.1 Damp heat test chamber 2
4.2 Low temperature test chamber 2
5 severity 2
6 Test procedure 3
6.1 Pretreatment 3
6.2 Initial detection 4
6.3 Condition test 4
6.4 Test cycle 4
6.5 Final test 7
7 Relevant specifications should give information 8
8 Information to be given in the test report 8
Appendix NA (informative) Part 9 of the GB/T 2423 standard
Foreword
This part is the 34th part of the GB/T 2423 standard. The components of the GB/T 2423 series of standards are listed in the informative appendix NA.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 2423.34-2005 "Electrical and Electronic Products Environmental Test Part 2. Test Method Test Z/AD. Temperature
Degree/humidity combination cycle test.
The main changes in this section compared with GB/T 2423.34-2005 are as follows.
--- Added Chapter 2 "Regulatory Citations" and Chapter 8 "Information to be given in the test report";
--- The original Chapter 2 "Purpose" was changed to Chapter 1 "Scope" of this part;
--- The original Chapter 1 "Guidelines" was changed to Chapter 3 "General Description" of this part, and the text narrative is different from the original;
--- Change the temperature tolerance unit "°C" to "K";
--- Added the requirement for temperature tolerance of the test chamber in 6.3;
--- Revised the "Information to be given by the relevant specifications" in Chapter 7, and added the content information that should be given by the relevant specifications.
This part uses the translation method equivalent to IEC 60068-2-38.2009 (2nd edition) "Environmental Test Section 2-38. Test Method
Test Z/AD. Temperature/Humidity Combined Cycle Test.
The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows.
GB/T 2421.1 Overview and guidelines for environmental testing of electrical and electronic products (GB/T 2421.1-2008, IEC 60068-1. 1988,
IDT)
GB/T 2423.3 Environmental testing of electric and electronic products - Part 2. Test method test Cab. constant damp heat test
(GB/T 2423.3-2006, IEC 60068-2-78.2001, IDT)
GB/T 2423.4 Environmental testing of electric and electronic products - Part 2. Test methods Test Db. alternating heat and damp (12h 12h
Ring) (GB/T 2423.4-2008, IEC 60068-2-30.2005, IDT)
Compared with IEC 60068-2-38.2009 (2nd edition), this section mainly makes the following editorial changes.
--- Removed the preface of IEC 60068-2-38.2009 (2nd Edition), adding a preface to the national standard;
--- Added the informative appendix "components of the GB/T 2423 standard" (see Appendix NA).
This part is proposed and managed by the National Technical Committee for Environmental Conditions and Environmental Testing Standardization of Electrical and Electronic Products (SAC/TC8).
This section is mainly drafted by. China Electric Apparatus Research Institute Co., Ltd., Shenzhen Institute of Metrology and Quality Inspection, Shanghai Quality Supervision
Supervised Inspection Technology Research Institute, Shanghai Industrial Automation Instrumentation Research Institute, Chongqing Sida Test Equipment Co., Ltd., Beijing University of Aeronautics and Astronautics.
The main drafters of this section. Xu Xuedong, Zhu Jianhua, Lu Zhaoming, Hu Honghui, Chen Yunsheng, Wu Hao.
The previous versions of the standards replaced by this section are.
---GB/T 2423.34-2005;
---GB/T 2423.34-1986.
Environmental testing - Part 2. Test methods
Test Z/AD. temperature/humidity combination cycle test
1 Scope
This part of GB/T 2423 provides a combined test method, mainly used for component test samples, which is determined by acceleration.
The test sample was tolerated under the conditions of high temperature/high humidity and low temperature conditions.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
IEC 60068-1 Environmental Test Part 1. Overview and Guidelines (Environmentaltesting-Part 1. Generaland
Guidance)
IEC 60068-2-30 Environmental testing - Part 2-30. Test methods Test Db. Alternating damp heat (12h 12h cycle) [En-
vironmentaltesting-Part 2-30. Tests-TestDb. dampheat, cyclic(12h 12hcycle)]
IEC 60068-2-78 Environmental testing - Part 2-78. Test method test Cab. constant damp heat test (Environmental
testing-Part 2-78.Tests-TestCab.dampheat,steadystate)
3 General instructions
3.1 Test overview
Test Z/AD is a cycle test of temperature/humidity combination to reveal that the test sample is caused by a different "breathing" effect than moisture absorption.
defect.
This test differs from other damp heat cycle tests in that the severity of this test is increased for the following reasons.
a) a greater number of temperature changes or "breathing" effects within a given time period;
b) the temperature cycle varies more;
c) the rate of temperature cycling changes is higher;
d) Contains multiple temperature changes below 0 °C.
The accelerated "breathing" and the icing effect of moisture adsorbed in the gaps of the test sample are the basic characteristics of this test.
However, it should be emphasized that the icing effect occurs only when the gap is large enough that the attached moisture can penetrate.
Born at the seal of the metal component or at the end of the lead.
The degree of condensation depends primarily on the thermal time constant of the surface of the test sample. Condensation for small test samples is negligible, but
The large test sample is significant.
Similarly, the "breathing" effect of a test sample with a large air or gas void will be more pronounced, but at the same time the severity of the test is
To a certain extent, it also depends on the thermal properties of the test sample.
3.2 Application of the test
For the above reasons, it is recommended that this test method is limited to the "breathing" and icing effects of the sample structure that produce the damp heat test, and that it is hot
A test sample of a component that is compatible with the rate of temperature change of the Z/AD test.
For solid test specimens with fine cracks or containing porous materials, such as plastic-packed test specimens, water vapor absorption or diffusion
It plays a leading role and is preferably tested with constant damp heat, such as IEC 60068-2-78 Test C.
For larger test samples, such as equipment, or components that are thermally stable at all stages of the cycle, despite IEC 60068-2-30
Test Db is less frequent in a given ti...