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GB/T 2423.2-2008 English PDF (GBT2423.2-2008)

GB/T 2423.2-2008 English PDF (GBT2423.2-2008)

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GB/T 2423.2-2008: Environmental testing for electric and electronic products - Part 2: Test methods - Tests B: Dry heat

GB/T 2423.2-2008
Environmental testing for electric and electronic products - Part 2. Test methods - Tests B. Dry heat ICS 19.040
K04
National Standards of People's Republic of China
GB/T 2423.2-2008/IEC 60068-2-2.2007
Replace GB/T 2423.2-2001
Environmental testing of electrical and electronic products
Part 2. Test methods
Test B. High temperature
(IEC 60068-2-2.2007, Environmentaltesting-
Part 2-2. Tests-TestB. Dryheat, IDT)
2008-12-30 released.2009-10-01 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 Terms and Definitions 1
4 Comparison of test methods for non-heat-dissipation test samples and heat-dissipation test samples 2 5 Test Description 3
6 Test procedure 4
7 Relevant specifications should give information 6
8 Information to be given in the test report 6
Appendix NA (informative) Component 8 of the GB/T 2423 standard
Appendix NB (informative) Test A. Low temperature and test B. relationship between high temperature classification code lowercase letters 11 GB/T 2423.2-2008/IEC 60068-2-2.2007
Foreword
GB/T 2423.2 is the second part of the GB/T 2423 standard, and the components of the GB/T 2423 standard are listed in the informative appendix NA. This part is equivalent to IEC 60068-2-2.2007 "Environmental Test Part 2-2. Test Test B. Dry Heat" (English version). Compared with IEC 60068-2-2.2007, this part mainly made the following editorial changes. --- The name of this section was changed to. "Environmental Testing of Electrical and Electronic Products - Part 2. Test Method Test B. High Temperature"; --- The word "this standard" was changed to "this part";
--- Removed the preface to IEC 60068-2-2.2007;
--- Removed the introduction of IEC 60068-2-2.2007, and translated its contents into the content of the additional informative Appendix NB; --- Added the informative appendix "components of the GB/T 2423 standard" (see Appendix NA); --- Added the informative appendix "Test A. Low Temperature and Test B. Relationship between Lowercase Letters of High Temperature Classification Codes" (see Appendix) NB);
--- Removed "for non-heat-dissipation test samples," in paragraph 1 of Chapter 1. --- Chapter 2 of the list of normative references adds a reference to GB/T 2423.22; ---4.3 title "temperature change and temperature gradient test application comparison" changed to "temperature gradient test"; ---6.8.2 The title "absolute humidity" was changed to "humidity".
For the sake of clarity, the above changes have been added to the corresponding position in the text. This part replaces GB/T 2423.2-2001 "Electrical and Electronic Products Environmental Test Part 2. Test Method Test B. High Temperature", In comparison, the main changes are as follows.
--- Removed the high temperature test of test Ba. non-heating test sample temperature mutation; --- Removed the high temperature test of test Bc. sudden change in temperature of the heat test sample; --- Removed Appendix A, Appendix B, Appendix C, Appendix D, Appendix E, Appendix F; --- Added Test Be. High temperature test for temperature gradient of heat test sample---The test sample was energized throughout the test. Appendix NA and Appendix NB of this part are informative annexes.
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 part is drafted by Guangzhou Electric Apparatus Research Institute. The main drafters of this section. Zhang Zhiyong.
The previous versions of the standards replaced by this section are.
---GB/T 2423.2-1981, GB/T 2423.2-1989, GB/T 2423.2-2001.
GB/T 2423.2-2008/IEC 60068-2-2.2007
Environmental testing of electrical and electronic products
Part 2. Test methods
Test B. High temperature
1 range
The high temperature test specified in this part of GB/T 2423 is applicable to non-heat and heat test samples. Test Bb and test Bd and early There is no substantial difference in the version 1).
1) The original IEC 60068-2-2.2007 has “for non-heat-dissipation test samples” before the sentence. The purpose of this high temperature test is limited to the ability to determine the use, transport or storage of components, equipment or other products in high temperature environments. This high temperature test cannot be used to evaluate the ability of the test sample to withstand temperature changes and the ability to operate in a temperature changing environment. In case of this, GB/T 2423.22 should be used.
The high temperature test method is subdivided into the following types. --- Non-heat dissipation test sample high temperature test.
● Test Bb, temperature gradient.
--- Heat test sample high temperature test.
● Test Bd, temperature gradient;
● Test Be, temperature gradient, test sample is energized throughout the test. The test methods given in this section are typically used for test samples that are temperature stable during the test. 2 Normative references
The terms in the following documents become the provisions of this part by reference to this part of GB/T 2423. Quotations with dated And all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouragement is achieved in accordance with this section. The parties to the agreement study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this section.
GB/T 2421 Environmental testing of electrical and electronic products - Part 1. General (GB/T 2421-1999, idt IEC 60068-1.1988) GB/T 2422 Environmental Test Terminology for Electrical and Electronic Products (GB/T 2422-1995, eqv IEC 60068-5-2..1990) GB/T 2423.22 Environmental testing of electric and electronic products - Part 2. Test methods Test N. Temperature change (GB/T 2423.22- 2002, IEC 60068-2-14. 1984, IDT)
GB/T 2424.1 Environmental testing for electric and electronic products - Guide to high temperature and low temperature test (GB/T 2424.1-2005, IEC 60068-3- 1.1974, IDT)
GB/T 2424.5 Electrical and electronic products environmental test temperature test chamber performance confirmation (GB/T 2424.5-2006, IEC 60068- 3-5.2001, IDT)
GB/T 2424.7 Measurement of temperature test chambers for environmental test A and B (with load) for electric and electronic products (GB/T 2424.7-2006, IEC 60068-3-7..2001, IDT)
IEC 60721 (all parts) Classification of environmental conditions
3 Terms and definitions
The following terms and definitions established by GB/T 2422 apply to this section. GB/T 2423.2-2008/IEC 60068-2-2.2007
3.1
Refers to the adjusted airflow rate of the workspace, which maintains the set conditions, but is also low enough that the temperature at any point on the test sample will not Reduced by more than 5K due to air circulation (if possible, no more than 0.5m/s). 3.2
Refers to the adjusted airflow velocity of the workspace, in order to maintain the set conditions, while making the temperature at any point on the test sample due to air circulation The effect of the ring is reduced by more than 5K.
4 Comparison of test methods for non-heat-dissipation test samples and heat-dissipation test samples 4.1 General
The manufacture and confirmation of the temperature test chamber shall be carried out in accordance with the provisions of GB/T 2424.5 and GB/T 2424.7. For high temperature and low temperature test guidelines, see GB/T 2424.1, and for general, see GB/T 2421. The test sample is considered to be dissipated only under the following conditions. when the temperature is stable (see GB/T 2421 for the corresponding content), The temperature at the hottest surface of the test sample measured under free air conditions (for example, low airflow speed cycle) exceeds the air around the test sample. The temperature is above 5K. When the relevant specifications require storage or transportation tests, or if no load is specified during the test, the high temperature test Bb is suitable.
4.2 Workspace is the determination of high airflow speed or low airflow speed Under the standard environmental conditions of measurement and test (see GB/T 2421), and the air flow rate < 0.2m/s, according to the high temperature strip to be tested The provisions under the device energize the test sample or add an electrical load. When the temperature of the test sample is stable, a suitable monitoring device should be used to measure several representative samples on or around the test sample. The temperature of the location. After that, the temperature rise of each location should be recorded. Turn on the ventilation device of the test chamber to circulate the air. When the temperature reaches a stable state, re-measure the temperature at the above position. The temperature obtained differs from the temperature measured when no air flow last time exceeds 5K (or other values specified in the relevant specifications) and should be in the test report. These temperature values were recorded and the test chamber was considered to have a high gas flow rate cycle. Then power off the test sample and remove any load condition.
4.3 Temperature Gradient Test 2)
2) IEC 60068-2-2.2007 is the original "comparison of temperature and temperature gradient test application". In the temperature gradient test Bb, test Bd and test Be, the test sample is placed in a test chamber at the temperature of the test chamber, and then slowly rises. The temperature in the high test chamber prevents harmful effects on the test sample due to temperature changes. 4.4 Test of heat test samples
Test Bd and Test Be describe the test procedure for the heat test sample at low gas flow rate cycling. This allows the test sample to be in the bureau The case where the heating point expands inside, similar to what happens in the application after the installed product. 4.5 Temperature monitoring
A temperature sensor should be used to measure the temperature of the air in the test chamber. The distance of the temperature sensor from the test sample should be ensured The effects of thermal diffusion are negligible. Care should be taken to avoid the effects of thermal radiation on these measurements. See GB/T 2424.5 for more information. 4.6 Packaging
For storage and transportation tests, the equipment can be tested with packaging. However, since the high temperature test specified in this section is a steady state test, The equipment will eventually stabilize at the test chamber temperature, so the package should be removed for testing unless the relevant specifications require packaging or the heating element is Integrated with the packaging.
4.7 icon
To facilitate the selection of test methods, Figure 1 shows an illustration of several different test methods. GB/T 2423.2-2008/IEC 60068-2-2.2007
Figure 1 Test B. Block diagram of high temperature test
5 test description
5.1 General
Test Bb, Test Bd and Test Be are similar. The differences are shown in 5.2.2, 5.3.2 and 5.4.2. The other parts starting from Chapter 6 are These tests are common. The rate of temperature change in the chamber should not exceed 1 K/min (the average of no more than 5 min). Related regulations Fan shall specify the functional requirements for the test sample test. It should be noted that any cooling device for the test sample is to comply with the relevant specifications. 5.2 Test B犫. High temperature test for temperature gradient of non-heat-dissipation test samples 5.2.1 Purpose
This test method is used to carry out the high temperature test of the non-heat-dissipation test sample, and the test sample is placed under high temperature conditions for a long time to reach The temperature is stable.
5.2.2 Overview
Place the test sample in a test chamber at the temperature of the test chamber, and then adjust the temperature to a severity level that meets the relevant specifications. temperature. When the temperature of the test sample has stabilized, it is exposed to the specified duration under this condition. For the test, it needs to be powered on. Test samples (even if they are not heat test samples) should be energized after the test sample temperature has stabilized, and functional tests are performed as needed Measurement. In this case, it may take some time for the temperature to stabilize, and then the test sample is exposed to the relevant specification at the high temperature. The duration of the decision.
Test samples are usually tested under non-operating conditions.
This test typically uses a high airflow rate cycle.
5.3.1 Purpose
This test method is used to carry out the high temperature test of the heat test sample, and the test sample is placed under high temperature conditions for a long time to reach the temperature. Stable.
5.3.2 Overview
If necessary, the test can determine whether the test chamber can meet the requirements of low air flow speed. Put the test sample into the temperature for the test room temperature In the test chamber, the temperature is then adjusted to a severe temperature that meets the relevant specifications. Power the test sample (see 5.3.3). When the temperature of the test sample has stabilized, it is exposed to the duration specified in the relevant specification under this condition. This test typically uses a low airflow rate cycle.
5.3.3 Powering the test sample
Then, energize or energize the test sample and check the test sample to determine if its function meets the relevant specifications. Test sample GB/T 2423.2-2008/IEC 60068-2-2.2007
The product shall be in operation according to the duty cycle and load conditions specified by the relevant regulations (if applicable). 5.4.1 Purpose
This test method is used to carry out the high temperature test of the heat test sample, and the test sample is placed under high temperature conditions for a long time to reach the temperature. The degree is stable and the test sample is required to be energized throughout the test. 5.4.2 Overview
If necessary, the test can determine whether the test chamber can meet the requirements of low air flow speed. Put the test sample into the temperature for the test room temperature In the test chamber, then power or load the test sample, check the test sample to determine whether its function meets the relevant specifications. begging. Test samples shall be in operation according to the duty cycle and load conditions specified in the relevant specifications, if applicable. The temperature is then adjusted to a stringent grade temperature that meets the relevant specifications. When the temperature of the test sample reaches a stable state, Exposure to the specified duration.
This test typically uses a low airflow rate cycle.
6 test procedure
6.1 Performance Confirmation
GB/T 2424.5 gives a guide to the performance verification of the temperature test chamber. GB/T 2424.1 gives the general test A and test B Operation guide.
The test chamber should be large enough compared to the size and number of heat test samples. 6.2 Work space
The test sample should be fully contained in the workspace of the test chamber. At steady state, the air temperature flowing to the test sample shall be within ±2K of the test severity level. Empty space The gas temperature should be measured in accordance with 4.5.
Note. When the above tolerance cannot be maintained due to the size of the test chamber, the tolerance can be relaxed. ±3K when the test temperature is less than or equal to 100 °C; test temperature Degree is greater than 100 ° C, but ± 5 K when it is less than or equal to.200 ° C; test temperature is greater than.200 ° C, but less than or equal to 315 ° C is ± 10K. When adopted The above tolerances shall be indicated in the test report. The user should also specify tolerances for test temperatures above 315 °C. 6.3 Thermal radiation
The ability of the test sample to transfer heat by means of thermal radiation should be minimized, usually by heating or cooling elements that block the test sample. And the method of ensuring that the temperature of the components constituting the inner wall of the test chamber is not significantly different from the temperature of the conditioned air. 6.4 Installation
The heat transfer and other relevant characteristics of the test sample during installation and connection shall be specified in the relevant specifications. When the test sample is used, it is installed. These devices should be used during the test in a particular device.
6.5 severity level
6.5.1 General
The relevant specification shall specify the severity of the test expressed by the temperature and the duration of the test. The severity shall be. a) selected from the values given in 6.5.2 and 6.5.3;
b) from a known environment, if the environment gives a numerical value that is significantly different; c) Quoted from other well-known related data sources (eg IEC 60721).
6.5.2 Temperature
● +1000°C
● +800 ° C
● +630 °C
● +500 ° C
● +400 ° C
GB/T 2423.2-2008/IEC 60068-2-2.2007
● +315°C
● +250°C
● +200°C
● +175°C
● +155°C
● +125°C
● +100°C
● +85 ° C
● +70°C
● +65°C
● +60°C
● +55°C
● +50 ° C
● +45°C
● +40°C
● +35 ° C
● +30 ° C
6.5.3 Duration
● 2h
● 16h
● 72h
● 96h
● 168h
● 240h
● 336h
● 1000h
When this test method is used in conjunction with tests related to durability and reliability, attention should be paid to the relevant standards or specifications for such tests. Specific recommendations for duration.
6.6 Pretreatment
Pretreatment is carried out in accordance with the requirements of the relevant specifications. 6.7 Initial detection
The initial state of the test sample can be obtained by visual inspection and/or functional testing as required by relevant specifications. 6.8 Conditional test
6.8.1 Steady-state conditions
Test samples should be exposed to high temperatures for the duration specified in the relevant specifications. For the exception that the test sample does not reach temperature stability, the test duration is calculated from the time the test sample is energized. Code Type, this situation is caused by samples with long working cycles.
6.8.2 Humidity 3)
3) IEC 60068-2-2.2007 is originally referred to as "absolute humidity". The absolute humidity should not exceed 20g/m3 (approximately 50% relative humidity at 35°C) and the relative humidity should not exceed 50%. 6.9 Intermediate detection
The relevant specification may require loading and/or loading at the end of the conditional test or at the end of the conditional test (the test sample is still in the test chamber). GB/T 2423.2-2008/IEC 60068-2-2.2007
measuring. If such measurements are required, the relevant specifications shall specify the content and time interval of such measurements. For this measurement, try The test sample should not be removed from the test chamber.
Note. If you are asked to know the performance of a test sample before the end of the specified test duration, you should prepare one for each different test duration. A separate batch of test samples. Each batch of samples should be individually recovered and final tested. 6.10 Final linear cooling
If the test sample remains in operation or load conditions during ...

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