The high temperature test described in this standard is applicable to two types of test samples: heat dissipation and non-heat dissipation. For non-heat dissipation test samples, Tests Ba and Bb basically do not violate the standards issued earlier. The purpose of this high temperature test is limited to determining the adaptability of parts, equipment or other products to be used or stored under high temperature environmental conditions. This high temperature test cannot be used to evaluate the temperature change resistance and working ability of the test sample during temperature changes. In this case. Test N: temperature change test method should be used. The high temperature test method is divided into: high temperature test of non-heat dissipation test sample: Test Ba: temperature mutation; Test Bb, temperature gradient. High temperature test of heat dissipation test sample: Test Bc: temperature mutation; Test Bd: temperature gradient. This test method is usually used for test samples that can achieve temperature stability during the conditional test. The test duration is calculated from the time when the test sample temperature reaches stability. In special cases, if the test sample cannot achieve temperature stability during the conditional test. The test duration is calculated from the time when the test box (room) reaches the specified test temperature. The relevant specifications should specify: a) the rate of temperature change in the test chamber (room); b) the time the test sample is placed in the test chamber (room); c) the time the test sample is exposed to the test conditions; d) the time the test sample is powered on or loaded. For these situations, the developers of the relevant specifications can select the above four parameters according to the GB/T2424.1-1989 guidelines (including the amendments to the above situations are under consideration). GB/T 2423.2-2001 Environmental testing for electrical and electronic products Part 2: Test methods Test B: High temperature GB/T2423.2-2001 standard download decompression password: www.bzxz.net

ICS19.040
National Standard of the People's Republic of China
GB/T2423.2—2001
idt1EC60068-2-2:1974
Environmental testing for electric and electronic products-Part 2:Test methods-Tests B.Dry heat2001- 11-02 Issued
People's Republic of China
General Administration of Quality Supervision, Inspection and Quarantine
2002-06-01Implementation
People's Republic of China
National Standard
Environmental testing for electric and electronic products
Part 2:Test methods
Test B; Dry heat
GB/T 2423,2 2(01
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GB/T2423.2-2001
IEC Preface
IEC Preface
|Test B; Historical overview of high temperature tests ·
Test A: Relationship between low temperature and Test B: High temperature subscripts 1
·General description
Description of test equipment
Severity level
Pretreatment
Initial test
Conditional test
Intermediate test
Final test
Information to be given in relevant specifications
Part 2 Test Bb: High temperature test with gradual temperature change of non-heat dissipation test sample Purpose
-General description
Description of test equipment·
Severity level·
Pretreatment·
Initial test
Conditional test
Intermediate test
Final test
Information to be given in relevant specifications·
GB/T 2423. 2-2001
Purpose…
General description·
Description of test equipment·Www.bzxZ.net
Severity level
Pretreatment…
Initial test
Conditional test
Intermediate test
Final test
Part III
Test Bc: High temperature test with sudden change of sample temperature for heat dissipation test Information to be given in the relevant specifications
Part IV
Test Bd: High temperature test with gradual change of sample temperature for heat dissipation test
General description
Description of test equipment|| tt||Severity level
Pretreatment
Initial test
Conditional test
Intermediate test
Final test
Information to be given in relevant specifications
Appendix A (Standard Appendix)
Appendix B (Standard Appendix)
Appendix C (Standard Appendix)
Appendix ID (Standard Appendix)
Appendix E (Suggestive Appendix)
Appendix F (Suggestive Appendix)
Volume of test sample
Calculation diagram for ambient temperature correction
Test Bl Method A Graphical diagram of test temperature conditions with forced air circulation Test Bc and Test Bd Method B Graphical diagram of test temperature conditions with forced air circulation test [3d (40.1.2) Simple flow chart of method A in Test Bc (29.1, 2) and Simple flow chart of method B in Test Bl (40.1.2) 10
GB/T 2423.2 2001
This standard is equivalent to the International Electrotechnical Commission 1EC60068-2-2: 1974 Basic Environmental Testing Procedures Part 2: Test Method Test B: High Temperature and its Amendment 1: 1993, Amendment 2: 1994. The amendment can be found in the following documents:
Draft Standard
50B(Central Office)332
5013(Central Office)340
Voting Report
50B(Central Office)336
50B(Central Office)344
This standard is a revision of GB/I2423.2-1989. This standard has the following main differences from GB/T2423.2-1989: In order to coordinate with the name of the GB/T 2423 series of standards for environmental testing methods for electrical and electronic products, the name of this standard is "Environmental testing for electrical and electronic products Part 2; Test method Test B: High temperature". GB/T 2423.2—1989 "Basic Environmental Test Procedures for Electronic Products Test I3: High Temperature Test Method" is equivalent to the international standard IEC60068-2-2 Basic Environmental Test Procedure Test B: High Temperature" (1974 edition) and its second supplementary document IEC60068-2-2A (1978). It is very different from IEC60068-2-2:1974 in terms of writing format and expression. The content of the standard is simplified into 10 parts, and the relevant charts and appendices are deleted. This standard is the same as IEC60068-2-2:1974 in terms of technical content, text structure and wording, writing method and order. The relevant reference standard information has also been modified accordingly in this standard with the update of the version. According to the relevant provisions on the equivalent adoption of international standards in GB/T1.11993≤Guidelines for Standardization Unit 1: Rules for Drafting and Expression of Standards Part 1: Basic Provisions for Standard Writing", this standard only makes individual editorial changes to the original standard in terms of writing format. This standard is one of the GB/T2423 series of standards for environmental testing methods for electric and electronic products. The national standards corresponding to IEC publications involved in this standard are: GB 2421-1999 Environmental testing for electric and electronic products Part 1: General (idt1EC60068-1:1988) GB3/T2422-1995 Terminology for environmental testing of electric and electronic products (eIEC 60068-5-2:1990) GB/T2424:1989 Environmental test procedures for electrical and electronic products High and low temperature test guidelines (cgv1FC:60) 68-3-1:1974) Appendix A, Appendix B, Appendix C, and Appendix D of this standard are standard appendices. Appendix E and Appendix F of this standard are indicative appendices. From the date of implementation, this standard will replace GB/T2423.2-1989. This standard is proposed by the China Electrical Equipment Industry Association. This standard is under the jurisdiction of the National Technical Committee for Standardization of Environmental Conditions and Environmental Tests for Electrical and Electronic Products! Drafting unit of this standard: Guangzhou Electrical Science Research Institute. Main drafters of this standard: Chen Jie, Zhang Xuying.
GB/T2423-2—2001
IEC Preface
1) IFC's formal resolutions or agreements on technical matters are formulated by technical committees represented by all national committees with special interests in the issue, and they try their best to express the international consensus on the issues under discussion. 2) These resolutions or agreements are recommended for international use and are accepted by national committees in this sense. 3) In order to promote international uniformity,IEC hopes that all national committees will adopt the text form of IEC recommended standards as national standards to the extent permitted by their national conditions. In the event of any inconsistency between national standards and IEC standards, this should be clearly stated in the national standards as far as possible.
IEC Foreword
This standard was prepared by IECTC50 Environmental Testing Technical Committee 50B Climate Technical Committee. The version currently adopted is Test B: High Temperature Test Third Edition (1966), which adds Test Bc: High Temperature Test with Sudden Change of Temperature of Heat Dissipation Test Sample and Test Bd: High Temperature Test with Gradual Change of Temperature of Heat Dissipation Test Sample. The first draft was discussed at the Washington Conference in 1970. Based on the results of the meeting, a second draft 50B (Central Office>159) was prepared and submitted to the national standards committees for approval in February 1171 according to the "June Method". Amendment 50B (Central Office Space) 168 Submitted to the National Standards Committees for approval in June 1972 under the "February Law". The following countries expressed their approval of the publication: Australia, Austria, Romania, Belgium, Italy, South Africa (Republic), Canada, Japan, Switzerland, Czechoslovakia, Netherlands, Sweden, Denmark, Turkey, Finland, Portugal, United States, Germany. The veto submitted by the French National Standards Committee was not due to any objection to the technical content of the document, but because they believed that the submission form requested by the majority of the National Committees at the Leningrad meeting of Subcommittee 50B in 1971 was too complicated. The French National Committee requested that the reasons for this veto vote be recorded. The United States accepted Test A and Test B, but did not accept Test E and Test D, thinking that they preferred to adopt the The test conditions for forced air circulation are recommended and this opinion is to be recorded. These recommendations can be found in IEC60068-1 Basic environmental test procedures, Part 1 General and IEC60068-3-1, Basic environmental test procedures, Part 3 Background information, Chapter 1: Low temperature test and high temperature test. Test: Historical overview of high temperature test
The first edition (1954)
contained only one procedure test: high temperature test, on temperature abrupt change. The second edition (1960)
was equivalent to test B above, but the standard test temperature range was extended to 200 °C. The third edition (1966)
introduced:
Test Ba, equivalent to test B above; but the standard test temperature range was extended to 1000 °C: GB/T 2423. 2—2001
Test Fh, a new method for temperature gradient. Fourth edition (1974)
Introduction:
Test Ba, equivalent to the above test Ba Test Bb, equivalent to the above test Bb;
Test Bc, a new method for sudden temperature change of the heat test sample! Test d, a new method for temperature gradient of the heat test sample. Directly related standards are:
GB/T2421-.1999 Environmental testing for electrical and electronic products Part 1: General (idtIEC60068-1:1988) GB/T2424.1-1989 Environmental testing regulations for electrical and electronic products High temperature and low temperature test guidelines (egvIEC60068-3-1.1974 and IEC60068-3-1A:1978)
Test A: Low temperature and Test B: High temperature The relationship between the subscript letters in Test A: Low temperature and Test B: High temperature is shown in the table below; subscript
Test sample
Non heat dissipation
Non heat dissipation
Test A: Low temperature test
Test sample
Temperature change
Sample temperature at the start of the test
Stable'
Stable·
Stable…
Stable·
# Before the test duration and the start of the test, the test sample is usually required to reach temperature stability. In special cases, this is not the case and it is necessary to refer to the relevant specifications, see Chapter 1 of the introduction and GB/T 2424.1-1989 (a revision covering these cases is under consideration). Additional information National Standard of the People's Republic of China Environmental testing for electric and electronic products Part 2: Test methods Tests B: I Dry heat Introduction 1 Overview GB/T 2423. 2-2001 IEC 60068-2-2:1974 Replaces CB/T 2423.2-1989 The high temperature tests described in this standard are applicable to both heat dissipating and non-heat dissipating test samples. Liu Ding Non-heat dissipation test sample, test 3a and 13h basically do not violate the earlier issued standards. The purpose of this high temperature test is limited to determining the adaptability of components, equipment or other products to be used or stored under high temperature environmental conditions. This high overflow test cannot be used to determine the resistance of test samples to temperature changes and their ability to work during temperature changes. In this case, test N: temperature change test method should be used. High overflow test methods are divided into:
Non-heat dissipation test sample high temperature test:
-test Ba: temperature sudden change;
test Bh: temperature gradual change.
Heat dissipation test sample high temperature test:
test Bc: temperature sudden change;
test Bd: temperature gradual change.
This test method is usually used for test samples that can reach temperature stability during the conditional test. The test duration is calculated from the time when the test sample temperature reaches stability. In special cases, if the test sample cannot reach temperature stability during the conditional test, the test duration is calculated from the time when the test box (chamber) reaches the specified test temperature.
Relevant specifications should specify:
a) the rate of temperature change in the test chamber (room); b) the time the test sample is placed in the test chamber (room); c) the time the test sample is exposed to the test conditions; d) the time the test sample is passed or loaded. For these situations, the developer of the relevant specifications can select the above 4 parameters according to the GB/T2424.11989 guide (including the amendments of the above situations are under consideration). 2 Application of the test method for non-heat dissipation test samples and heat dissipation test samples After the temperature of the test sample reaches a stable state. When measured under free air conditions (i.e., no forced air circulation), the hottest point on the surface of the test sample Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China 2001:11-02 Implementation on June 1, 2002
GB/T 2423.2-2001
The temperature is higher than the ambient air temperature by more than 5°C, then the test sample is considered to be heat dissipated (see GB/T 2421-1999 4.6) For test samples that require some storage tests or that are not specifically specified to be loaded during the test, high temperature test methods I3a and Bb are used.
3 Non-heat dissipation test samples: Application comparison of temperature sudden change test and temperature gradient test Temperature sudden change test IBa: Place the test sample at room temperature in a test box (room) with a specified test temperature. This is a simple and time-saving method. This test method is applicable to the case where it is known that the temperature sudden change will not cause damage to the test sample. Temperature gradient test Bb: First place the test sample at room temperature in a test box (room) with a low temperature, and then gradually increase the temperature of the test box (room). In this way, the test sample will not be damaged by the temperature change. 4 Heat dissipation test samples with or without forced air circulation The best test method for heat dissipation test samples is to conduct them without forced air circulation. However, if this requirement is difficult to achieve, when the heat dissipation test samples are subjected to forced air circulation, the two methods of test Bc and Bd can be used. There are two methods for the test with forced air circulation: method A and method B. Method A is used when the test chamber (room) is large enough to meet the test requirements without forced air circulation, but the specified high temperature environment cannot be maintained without forced air circulation. Method B is used when the test chamber (room) is too small and cannot meet the test requirements without forced air circulation. 5 Diagram
In order to facilitate the selection of test methods, the classification block diagram of various methods is shown in Figure 1. Graphical procedures for various test methods Test B = Non-heat-sensitive test sample Ba: Temperature change No artificial cooling test sample (29.1) No peak tracking Air box Environmental test Single sample test 529. 1. 1) With channel Air box Environmental test Multiple sample test (29. 1. 1. 2)
, temperature gradient
stored in 1 cooling
test sample [29.2]
cooling system
and test acid box
(29.2.t)
single sample
test
(29.1.2.1)
reduction inspection system
not with test
(29.2. 2)
Multiple samples
(29.1.2.2)
BcC: Temperature sinus change
Heat dissipation test sample
Bl: Temperature gradient
No artificial cooling test sample (40.1)
No forced
Circulation test
Single sample
Product test
(4.1.1.1)
With forced
Air circulation
Circulation test
Multiple samples
Product test
(40.1.1. 23 Block diagram for classification of high temperature test methods Manual cooling test samples (40.2) Storage system and test chamber Single sample test <40.1.2.13 For ease of use, this standard gives the complete content of the cross-reference relationship for each test method. Cooling system Not separated from the test chamber Multiple sample test (40.1.2.2) Some clauses are the same in test methods Ba, Bb, LBe and Bd. The same and different clauses of test Ba, Bb, Bc and Bd are shown in Figure 2 As shown.
General description
Description of test equipment
Severity level
Pretreatment
Initial inspection
Performance test
Intermediate inspection
Final inspection
Information to be drawn for relevant specifications
GB/T 2423.2—2001
Test
Figure 2 Test B: Block diagram of high temperature test
Part 1 Test Ba: Sudden temperature change of non-heat dissipating test sample The high temperature test provides a standard test procedure to determine the suitability of non-heat dissipating components, equipment or other products that can withstand sudden temperature changes without causing damage under high temperature conditions for use and (or) storage. This test is used to test samples that have been subjected to high temperatures for a long time, long enough for the test samples to reach temperature stability. In this test, the test duration is usually calculated from the time when the test sample reaches temperature stability. If this condition cannot be met, refer to Chapter 1 of the Introduction.
2 General description
GB/T2423.22001
This test is to place the test sample at room temperature in a test box (room) whose temperature meets the strict vinegar level specified in the relevant specifications. After the test sample reaches temperature stability, it is exposed to the specified duration under this condition. The test sample is usually in a non-working state during the test, and this test usually uses forced air circulation. 3 Description of test equipment
3.1 In the working space of the test box (room), in order to maintain the temperature conditions and tolerance values ​​specified in 4.1 of this standard, forced air circulation can be used to maintain uniform temperature.
3.2 In order to limit the influence of radiation, after the temperature of the inner wall of the test box (room) reaches stability, the difference between the temperature of each part of the inner wall and the specified test environment temperature should not exceed 3% of the specified test environment temperature (calculated in Kelvin temperature). This requirement applies to all parts of the test chamber wall, and the test sample should not be directly radiated by any heating and cooling element that does not meet the above requirements. 3.3 The absolute humidity should not exceed 20g/m3 of water vapor (equivalent to 50% relative humidity at 35°C). When the test temperature is lower than 35°C, the relative humidity should not exceed 50%.
4 Severity level
The relevant specifications should specify the severity level represented by the test temperature and the test duration, and its value should be selected from the values ​​given in 4.1 and 4.2.
4.1 Temperature
+200℃±2℃
+175C±2℃
+155℃±2℃
+125 C 12 C
+100℃±2℃
+85C±2℃
+70℃±2℃
+55℃±2℃
+40℃12℃
30 ℃±2℃
1 Without considering other factors, for temperatures between 200°C:～1000C, the temperature should be selected from the following values: 250c.315,400o.500c.630c.800c.1000c. The tolerance value is ±2% of the above temperature value (calculated); 2 If this tolerance value cannot be guaranteed due to the size of the test chamber (room), it can be relaxed to ±3°C below 100°C and ±5°C between 100°C and 200°C. In this case, the tolerance value should be clearly stated in the relevant test report. 4.2 Duration
2 h, 16 h, 72 h, 96 h.
When this standard is used for tests related to durability or reliability, the duration required for the test shall be specified by the relevant specifications. 5 Pretreatment
Pretreatment may be required by the relevant specifications.
6 Initial inspection
GB/T 2423.2---2007
The test samples shall be inspected for appearance and electrical and mechanical properties in accordance with the relevant specifications. 7 Condition test
7.1 The test chamber (room) shall be at the temperature required by the specified severity level. Place the test sample at room temperature in the test box (room) in the normal position or other specified position without packaging, power supply and "ready for use" state:
If the test sample is used together with a specific mounting frame, these devices should be used in the test. The test environment temperature measurement shall be carried out in accordance with the provisions of 4.4 of GB/T2421-1999. 7.2 Ensure that there is enough time to restore the test box (room) to the specified environmental conditions and allow the test sample to reach temperature stability (for the definition of temperature stability, see 1.6 of GB/T 2421-.-{999) 7.3 Functional test
Power or electrical load the test sample in accordance with the relevant specifications. And check to determine whether it can achieve the specified function. If the relevant specifications require it, the test sample shall be in operation according to its specified working cycle and load conditions (when feasible), or not powered.
Note: Although the test sample is in operation or under load conditions, as long as the surface temperature does not exceed 5Y of the surrounding air temperature, it is considered to be non-heat dissipation. 7.4 The duration of exposure of the test sample under high temperature conditions shall be specified in the relevant specifications. The duration is calculated from the time when the temperature of the test sample reaches stability. Note: For some small test samples, it is not necessary to check whether they have reached temperature stability through testing pads. See Note 2 of 4.R in GB/T2421-1999. 7.5 If the relevant specifications require intermediate testing, it can be carried out in accordance with the requirements of Chapter 8 of this standard. 7.6 At the end of the conditional test, the test sample enters the recovery program. For the test sample that is powered on or loaded, the power should be stopped or the load should be removed before entering the recovery program.
8 Intermediate testing
The relevant specifications may stipulate that the test sample is loaded and (or) measured while it is still in the test box (room) during or at the end of the conditional test. If necessary, the measurement items and duration should be specified. During the measurement, the test samples shall not be taken out of the test box (chamber). Note: During the condition test, it is not allowed to take the test samples out of the test box (chamber) for measurement before recovery and then put them back into the test box (chamber): If the performance of the test samples at a specific time is required before the end of the duration, a batch of test samples shall be added for each specific time for recovery and final measurement. Each batch of test samples shall be carried out separately. 9 Recovery
9.1 The test samples shall be recovered under standard atmospheric conditions for a sufficient time to allow the test samples to reach temperature stability. The recovery time is at least 1 hour. When several test samples are tested at the same time and the recovery time of 1 hour is sufficient, the maximum recovery time is 2 hours. All measurements must be completed before the end of this time.
9.2 If required by the relevant specifications, the test samples may be powered or loaded during the recovery period and measurements may be made continuously. 9.3 When the standard conditions given above are not suitable for the test samples, the relevant specifications may specify other recovery conditions. 10 Final inspection
Perform visual inspection and electrical and mechanical performance tests on the test samples in accordance with the relevant specifications. 11 Information to be given in the relevant specifications
When the relevant specifications include high temperature tests, the following items should be given as much detail as possible:
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