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

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 time so that the degree of acceleration is not as high, and test Db should also be used. In this case, the test Db usually forms part of the test sequence specified in IEC 60068-1.
As with other damp heat tests, this test can apply a polarized voltage or an electrical load to the test sample. When applying an electrical load, it cannot be tested The temperature of the sample rises to affect the conditions of the test chamber. In summary, this test is obviously not interchangeable with the constant damp heat test or the alternating damp heat test, and it cannot replace them. Test procedure The choice should be based on the physical properties, thermal properties of the test sample and the type of primary failure mechanism in each particular case. 4 Description of the test chamber
The test sample is exposed to moist heat and then exposed to low temperatures, and both exposures can be carried out in one test chamber or in two test chambers. 4.1 Damp heat test chamber
The damp heat test chamber shall meet the following requirements.
a) Within 1.5h~2.5h, the temperature can rise or fall between 25°C±2K and 65°C±2K. b) The relative humidity can be maintained at (93 ± 3)% during constant temperature or temperature rise, and can be maintained at 80% to 96% during cooling. c) Care should be taken to ensure that the temperature and humidity at all points in the workspace are uniform and should be as close as possible to the appropriately placed temperature and humidity sensor The conditions are the same. The air in the test chamber should flow continuously at a constant rate to maintain the specified temperature and humidity conditions. d) The test sample shall not be affected by the thermal radiation generated by the conditions in the test chamber during the test. e) The water used to generate the humidity in the tank shall have a resistivity of not less than 500 Ω·m. f) Condensate should be continuously discharged from the tank and must not be reused without purification. Measures should be taken to ensure condensate on the tank wall and tank top Do not drip on the test sample.
4.2 Low temperature test chamber
The low temperature test chamber shall meet the following requirements. a) the temperature can be maintained at -10 °C ± 2K;
b) Care should be taken to ensure that the temperature at each point in the workspace is uniform and that it should be as close as possible to the strip in the immediate vicinity of the appropriately placed temperature sensor The pieces are the same. The air in the test chamber should flow continuously at a constant rate to maintain the specified temperature conditions. Should pay attention to the test sample The heat capacity of the product does not significantly affect the conditions in the tank. The damp heat test chamber shall be used for the low temperature test. The damp heat test chamber shall meet the requirements of 4.1 and shall also meet the following requirements. 1) Within 30 minutes, the temperature can be reduced from 25 °C ± 2K to -10 °C ± 2K; 2) The temperature of the test sample can be maintained at -10 °C ± 2K for 3 h; 3) The temperature can be increased from -10 °C ± 2K to 25 °C ± 2K within 90 minutes. 5 severity
Unless otherwise specified, the number of 24h cycles should be 10 times. If it is not 10 times, the relevant specifications should specify the number of cycles. 6 test procedure
6.1 Pretreatment (see Figure 1)
Figure 1 Pretreatment
Unless otherwise specified, the test sample shall be unpackaged, unenergized, ready for use prior to the first cycle of the damp heat test. Placed under "Standard Drying Conditions" as specified in IEC 60068-1 (temperature 55 °C ± 2 K, relative humidity not exceeding 20%) for 24 h. Initial inspection The pre-test test sample shall be temperature stable under the conditions specified by standard atmospheric conditions or relevant specifications. 6.2 Initial detection
Visual inspection of the test samples and electrical and mechanical performance testing in accordance with the relevant specifications. 6.3 Condition test
The total temperature tolerance ±2K is taken into account the absolute error of the measurement, the slow change in temperature and the temperature change in the workspace. Fixed. However, in order to maintain the relative humidity within the specified tolerance range, the temperature difference between any two points in the workspace at any time should be Maintained in a smaller range. If the temperature difference exceeds 1K, the humidity condition will not meet the requirements. In order to maintain the specified humidity, temperature Short-term fluctuations should be maintained at ±0.5K.
The test sample shall be in a state of no packaging, no electricity, ready for use, and placed in a wet state in accordance with known normal conditions or relevant specifications. In the hot box, 10 temperature/humidity cycles were performed, each cycle being 24 h. During the 5 cycles of the first 9 cycles, after the wet heat cycle a~f is completed (see Figure 2), the test sample should be subjected to low temperature cycling. The relevant specification shall specify the sequential position of the low temperature sub-cycle. This test can be carried out in one test chamber or in two test chambers. If the high temperature/high humidity and low temperature cycle of this test are different respectively Conducted in the test chamber, the test sample should not be affected by thermal shock unless the test sample is known to be insensitive to this level of thermal shock. If a batch of test samples is affected by thermal shock due to the use of two-box method and there is significant failure, the temperature gradient method should be used instead. Another batch of test samples in the new test, if there is no failure under these conditions, the test samples should be considered as passing the test. The remaining 4 cycles in the first 9 cycles should not include low temperature exposure (see 6.4.3 and Figure 3). Wet heat cycle specified in all cases The rings are the same.
6.4 Test cycle
6.4.1 Temperature/humidity cycle description
The description of the temperature/humidity cycle applies to all cycles (see Figures 2 and 3). At the beginning of each 24h cycle, the temperature of the chamber should be controlled to 25 °C ± 2K and the relative humidity is (93 ± 3)%. a) The temperature of the test chamber should be continuously raised to 65 °C ± 2K within 1.5h~2.5h. During this time the relative humidity should be maintained at (93 ± 3)%.
b) The temperature and relative humidity of the test chamber are maintained at 65 °C ± 2K and (93 ± 3)%, respectively, until the start of the cycle test 5.5h.
c) The temperature of the test chamber drops to 25 °C ± 2K within 1.5h~2.5h. During this period, the relative humidity should be kept at 80%~96%. Within the scope.
d) From 8h after the start of the cycle, the temperature of the test chamber should be continuously increased to 65 °C ± 2K within 1.5h~2.5h. In this period The relative humidity should be maintained at (93 ± 3)%.
e) The temperature and relative humidity of the test chamber are maintained at 65 °C ± 2K and (93 ± 3)%, respectively, until the start of the cycle test 13.5h.
f) The temperature of the test chamber drops to 25 °C ± 2K within 1.5h~2.5h. During this period, the relative humidity should be kept at 80%~96%. Within the scope.
g) The test chamber continues to be stable at a temperature of 25 °C ± 2K, relative humidity (93 ± 3)%, until the low temperature cycle begins or 24h The ring ends.
6.4.2 Low temperature cycle description
Applicable to some 5 cycles in the first 9 cycles, as shown in Figure 2. Figure 2 Exposure to low temperatures after exposure to damp heat
Figure 3. Not exposed to low temperature after exposure to damp heat
a) After completing the temperature/humidity cycle a~f (see Figure 2), the test chamber should maintain a temperature of 25 °C ± 2K, relative humidity (93 ± 3)%, the time is at least 1h, and the maximum is no more than 2h.
b) Then lower the tank temperature or transfer the test sample to another low temperature test chamber. If the two-box method is used, the transfer time should be Within 5min. From 17.5h after the start of the cycle, the temperature inside the tank should start to cool down and fall within 18h after the start of the cycle. -10 ° C ± 2K.
c) From 18h after the start of the cycle, the temperature inside the tank is kept at -10 °C ± 2K for 3 hours. During the entire low temperature cycle The requirement for relative humidity is not specified.
d) The temperature inside the tank starts to rise from 21 h after the start of the cycle and rises to 25 °C ± 2 K within 22.5 h after the start of the cycle (see figure 2). If the two-box method is used, the transfer of the test sample should be completed within 10min~15min. e) The temperature inside the tank is kept at 25 °C ± 2K until the end of the 24h cycle. The relative humidity should be (93 ± 3)% during this period. 6.4.3 24h cycle description without low temperature exposure
Applicable to the remaining 4 cycles in the first 9 cycles (see Figure 3). After the temperature/humidity cycle, the cycle test that does not include the low temperature cycle is the same as the one specified in 6.4.1, but the temperature inside the box is guaranteed during the g segment. Hold at 25 °C ± 2K, relative humidity (93 ± 3)%, until the end of the 24h cycle. 6.4.4 Last loop description
In the last cycle, after the end of the humidity and temperature cycle, the test chamber should maintain a temperature of 25 ° C ± 2K, relative humidity (93 ± 3)%, duration 3.5 h, and then the final test.
6.5 Final detection
6.5.1 Summary
Electrical and mechanical properties can be tested under the following conditions. a) when it is wet;
b) immediately after the test sample is taken out of the box;
c) after drying;
d) as required by relevant regulations.
Many of the test results obtained under high humidity conditions cannot be directly compared with the test results obtained after the initial test or the sample take-out box. 6.5.2 Detection under high humidity conditions
The test was performed within the last 2 hours of the 3.5 h period described in 6.4.4. Relevant specifications should specify special precautions to be observed when performing tests under high humidity conditions, including removal of test sample sheets when needed. The method taken by the surface water droplets.
After all tests are completed, the test sample should be taken out of the box. 6.5.3 Testing immediately after the test sample is taken out of the box At the end of the final cycle, the test sample is taken out of the box and tested under laboratory ambient temperature conditions. If the initial test is not performed under laboratory ambient temperature conditions, the environmental conditions used for this test should be the same as the initial test. the same.
The test for the specified electrical and mechanical properties shall be carried out within 1 h to 2 h after the test sample is taken out of the box. The test performed in the early period of this period can be repeated only once in the later period of this period, and the results measured later will be used as the failure judgment. in accordance with.
6.5.4 Detection after drying recovery
At the end of the final cycle, the test sample should be taken out of the box and kept at the standard atmospheric conditions for 24 hours before the final Detection.
If the initial test is not performed under standard atmospheric conditions, the environmental conditions used for this test should be the same as the initial test. The final test can be performed within 24 hours, but only the test results obtained before the end of 24h are used as the basis for the failure determination. 7 Relevant specifications should give information
When the relevant specifications contain this test, the following detailed provisions should be made as far as practicable. a) type of tes...

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