The low temperature tests involved in this standard are applicable to both non-heat dissipation and heat dissipation test samples. For non-heat dissipation test samples, tests Aa and Ab do not violate the standards issued earlier. This standard is limited to assessing or determining the adaptability of electrical and electronic products (including parts, equipment and other products) to be stored and (or) used under low temperature environmental conditions. This low temperature test cannot be used to evaluate the resistance of the test sample to temperature changes and the ability to work during temperature changes. In this case, test N: temperature change test method should be used. Low temperature test methods are divided into the following three categories: Low temperature test of non-heat dissipation test samples: - Test Aa: temperature sudden change - Test Ab: temperature gradual change Low temperature test of heat dissipation test samples: - Test Ad: temperature gradual change 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 and the test begins; d) the time the test sample is powered on or loaded. Under these conditions, the developers of the relevant specifications can select the above four parameters according to the GB/T2424.1-1989 guidelines (revisions under the above conditions are under consideration). GB/T 2423.1-2001 Environmental testing for electrical and electronic products Part 2: Test methods Test A: Low temperature GB/T2423.1-2001 standard download decompression password: www.bzxz.net

ICS19.040
National Standard of the People's Republic of China
GB/T 2423.1—2001
idtIEC 60068-2-1:1990
Environmental testing for electric and electronic products
Part 2:Test methods
Test A: Cold
Environmental testing for electric and electronic products-Part 2:Test methods-Tests A : Cold2001-07-12Promulgated
People's Republic of China
General Administration of Quality Supervision, Inspection and Quarantine
2001-12-01Implementation
GB/T 2423. 1—2001
IECForeword
Test A: Historical overview of low temperature tests
Test A: Low temperature and Test B: Relationship between subscript lettersCitations
Citation standards
Comparison of test methods for non-heat dissipation test samples and heat dissipation test samples3
Non-heat dissipation test samples: Comparison of application of temperature sudden change test and temperature gradual change test4
Test of heat dissipation test samples with or without forced air circulation6
Part I
General description
Test equipment
Severity level||t t||Pretreatment
Initial inspection
Conditional test
Intermediate inspection
Final inspection
Test A: Low temperature test of non-heat dissipation test sample with sudden change of temperature Information to be given in relevant specifications
Part 2
12th
General description
Test equipment·
Severity level·
Pretreatment
Initial inspection·
Conditional test·
Intermediate inspection
Test Ab: Low temperature test of non-heat dissipation test sample with gradual change of temperature GB/T 2423.1—2001
Final test
Information to be given in the relevant specifications·
Part III
General description·
Test equipment·
Severity level
Pretreatment:
Initial test·
Conditional test·
Intermediate test
Final test
Information to be given in the relevant specifications
Appendix A (Standard Appendix)
Appendix B (Standardized Appendix)
Appendix C (Appendix to the standard)
Test Ad: Low temperature test with gradual temperature change of heat dissipation test sampleCalibration calculation diagram for ambient temperature
Test Ad Method A: Diagram of temperature state in test Ad with forced air circulationMethod B: Diagram of temperature state in test Ad with forced air circulationSimple flow chart of method A in Test Ad (20.1.2)Appendix D (Suggestive Appendix)
Appendix E (Tyr's Appendix)
Simple flow chart of method B in Test Ad (29.1.2)++
GB/r 2423.1-2001
This standard is equivalent to the International Electrotechnical Commission IEC60068-2-1:1990 (Fifth Edition) Environmental Testing Part 2: Test Test A: Low Temperature" and its Amendment 1:1993. Amendment 2:1994. Differences between this standard and IEC60068-2-1: t990 (fifth edition): To coordinate with the name of GB/T2423 series of environmental testing standards for electric and electronic products, the name of this standard is: "Environmental testing for electric and electronic products Part 2: Test methods Test A: Low temperature". This standard has the following main differences from GB/T 2423.1: 1989: The technical content, writing format and expression method of this standard are consistent with IEC60068-2-1: 1990. Although GB/T2423.1-1989 is equivalent to IEC60068-2-1:1974 (4th edition), the format and expression method are very different from IEC60068-2-1:1974. For example, the same contents of the three tests Aa, Ab and Ad are summarized and edited into chapters: its appendix B and appendix C are changed into Figure 1 and Figure 2 of the standard text; the schematic diagram of the similarities and differences of tests Aa, Ab and Ad is deleted, and the template is written according to the GB/T1.1 standard, and a reference standard is added in the introduction. This standard adds appendix D and appendix E (according to the amendment 2:1994 of IEC60068-2-1:1990). - The last sentence of paragraph 3 of 6.2 in GB/T2423.11989 (this standard is 4.2, 15.2 and 26.2) is deleted: \But in any case, the duration should not be less than 30 min\. According to GB/T 2422-1995, this standard translates relevant specification into \relevant specification\, while GB/T 2423.1-198 is translated into "relevant specification".
This standard is one of the GB/T2423 "Environmental testing for electrical and electronic products" series of standards. The national standards corresponding to IEC publications involved in this standard are:
GB/T2421-1999 Environmental testing for electrical and electronic products Part 1: General (idtIEC60068-1:1988) GB/T2422-1995 Environmental testing terminology for electrical and electronic products (eqVIEC60068-5-2:1990) GB/T2424.1-1989 Environmental testing procedures for electrical and electronic products High and low temperature test guidelines (eqVIEC60068-3-1:1974) Appendix A, Appendix B and Appendix C of this standard are standard appendices. Appendix D and Appendix E of this standard are informative appendices. This standard will replace GB/T 2423.1-1989 from the date of implementation. This standard was proposed by the State Bureau of Machinery Industry and is under the jurisdiction of the National Technical Committee for Standardization of Environmental Conditions and Environmental Tests for Electrical and Electronic Products.
木标雄 Drafting unit: Guangzhou Electric Science Research Institute. The main drafters of this standard: Zhao Shijie, Chen Jie, Zhang Yongbin. The standard was first issued in 1981 and revised for the first time in February 1989. This standard is entrusted to the National Technical Committee for Standardization of Environmental Conditions and Environmental Tests for Electrical and Electronic Products for interpretation. GB/T2423.1-2001
IEC Foreword
1) IEC'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 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 final text form of the standards recommended by IEC as the national standard form within the scope permitted by their national conditions. In the event of any inconsistency between national standards and IEC standards, it should be clearly stated in the national standards as much as possible.
This standard was developed by IECTC50 Environmental Testing Technical Committee 50B Climate Subcommittee. IFC60068-2-1 (Fifth Edition) is based on the fourth edition of IEC60068-2-1 (1974) (including the fourth edition revised version IEC60068-2-1A: 1976 and the fourth edition revised: 1983) and the following documents, Table]
Publication
60068-2-1 (Fourth Edition)
First Revision
60068-2-1A
Six-month method
50B(CO)158
50B(CO)239
50B(CO)182
Voting report
50B(CO)163
5B(CO)250
50B(CO)187wwW.bzxz.Net
Full voting information on agreeing to this standard can be found in the voting report in the table above. This standard refers to the following IEC publications:
Publication No. IEC60068-1:1988 Environmental testing Part 1: General two-piece method
50B(CO)167
Voting report
50B(CO)172
IEC:60068-3-1:1974 Environmental testing Part 3: Background information, Chapter 1: Low temperature and ten heat tests
GB/T 2423.1—2001
First publication (1954)
Test A: Historical overview of low temperature tests
Contains only Test A: Low temperature test, involving a sudden change in temperature, with a standard test time of 6 h. Second publication (1960)
Same as Test A, but with a standard test time of 2 h. Third publication (1966)
Introduction:
Test Aa; Same as previous version Test A.
Test Ah: New method of temperature gradient. Fourth publication (1974)
Introduction:
Test Aa; Same as previous version Test Aa.
Test Ah: Similar to previous version Test Ab.
Test Ad: New method of temperature gradient for heat dissipation samples. The relationship between test A: low temperature and test B: hot heat test, the relationship between the subscript letters of test A: low temperature and test B: hot heat test, see the table below: Subscript letters
Sample type
Non heat dissipation
Non heat dissipation
Non heat dissipation
Test A: low temperature test
Temperature change
Sample temperature at the start of the test
Stable*
Stable*
Sample type
Non heat dissipation
Non-sensitive heat
Test B: dry heat test
Temperature change
Sample temperature at the start of the test
Stable*
Stable*
Stable*
*: The test sample must reach temperature stability before the start of the test duration. In special cases, this may not be the case, which requires additional information to be provided in the relevant specifications, see Section 1 of the introduction and IEC 60068-3-1 (modification of these cases is under consideration).
National Standard of the People's Republic of China
Environmental testing for electric and electronic products
Part 2: Test methods
Test A: Low temperature
Environmental testing for electric and electronic products-Part 2: Test methods-Tests A: Cold General
1 Overview
GB/T 2423. 1—200T
idtIEC 60068-2-1:1990
Replaces GB/T 2423.1—1989
The low temperature tests involved in this standard are applicable to both non-heatsinking and heatsinking test samples. For non-heatsinking test samples, Tests Aa and Ab do not violate earlier issued standards.
This standard is limited to assessing or determining the adaptability of electrical and electronic products (including components, equipment and other products) to be stored and (or) used under low temperature environment conditions.
This low temperature test cannot be used to evaluate the resistance of the test sample to temperature changes and the working ability during temperature changes. In this case, test N: temperature change test method should be used. Low overflow test force method is divided into the following three categories:
Non-heat dissipation test sample low temperature test: - Test Aa: temperature sinus change Test Ab: temperature gradient
Heat dissipation test sample low temperature test:
-Test Ad: temperature gradient
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 chamber (case) reaches the specified test temperature. The specification should specify:
) the temperature change rate in the test box (room); b) the time when the test sample is placed in the test box (room); a) the time when the test sample is exposed to the test conditions; b) the time when the test sample is powered on or loaded. Under these conditions, the developer of the relevant specifications can select the above four parameters according to the GB/T2424.1-1989 guide (the revision under the above conditions is under consideration).
2 Reference standards
The provisions contained in the following standards are used in this standard and constitute the provisions of this standard: When this standard is published, the version shown is valid worldwide. All standards will be revised, and the parties using this standard should explore the possibility of using the latest version of the following standards. GB/T 24211999 Environmental testing for electric and electronic products Part 1: General (idtIEC60068-1: 1988) GB/T 24221995 Environmental testing terminology for electric and electronic products (eqVIEC60068-5-2: 1990) Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on July 12, 2001 and implemented on December 1, 2001
GB/T 2423- 1—2001
GB/T2424.1—1989 Basic environmental test procedures for electrical and electronic products Guidelines for high and low temperature tests (eqv1EC60068-31:1974)
3 Comparison of the test methods for non-heat dissipation test samples and heat dissipation test samples After the temperature of the test sample reaches stability, when measured under free air conditions (i.e., without forced air circulation), the temperature of the hottest point on the surface of the test sample is 5K higher than the ambient air temperature, which is considered to be heat dissipation (see 4.3 in GB/T2421--1999). For test samples that are not specifically loaded during storage tests and tests, the low temperature test method Ab is used. 4 Non-heat dissipation test samples: Comparison of the application of temperature sudden change test and temperature gradual change test Temperature sudden change test Aa: First adjust the temperature of the test box (room) to the specified test temperature, and then put in the test sample with room temperature. This is a simple and time-saving method. This test method is applicable to the situation where it is known that the temperature sudden change will not damage the test sample. Temperature gradient test Ab: first put the test sample at room temperature into the test box (room) at room temperature, and then gradually cool the test box (room) to the specified test temperature. This test method will not damage the test sample due to temperature changes. If the test sample is too large or the functional test wiring is complex, it is impossible to put it into a low temperature box without dust and frost during the sudden change test, then test Ab should be used. 5. Test of heat dissipation test samples with or without forced air circulation. The best test method for heat dissipation test samples is to conduct them under forced air circulation. If this requirement is difficult to meet, test Ad can be used when the heat dissipation test sample is under forced air circulation. There are two methods for 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. The test chamber (room) cannot maintain the specified low temperature environment 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. 6 Diagram
In order to facilitate the selection of test methods, the classification block diagram of various methods is shown in Figure 1. For the convenience of users of this standard, this standard gives the complete content of each test method without cross-reference. Some clauses are the same, especially test methods Aa and Ab. The block diagram in Figure 2 shows which are the same and which are different. Test A: Low temperature
Non-heat dissipation test sample
Aa: Temperature change
Ab: Temperature gradient
No artificial cooling
Test sample
No forced air
Cycle test
(29. 1. 1)
There is exhaust air
Monkey ring test
(29. 1. 2)
Block diagram of low temperature test method classification
Heat dissipation test sample
Ad: Temperature full change
There is artificial cooling
or test sample
Cooling system and
Test face sugar are separated
(29. 2. 1)
Cooling system and test
Test chamber are not separated
Graphical procedures of various test methods
General description
Test equipment
Harsh load
Pretreatment
Initial test
Conditional test
Intermediate test
Final test
Information to be given in the relevant specifications
GB/T2423.1—2001
Figure 2 Test A: Low temperature test method diagram Test Aa, Ab and Ad and similarities and differences Figure 1 from
GB/T2423-12001
Part 1 Test Aa: Non-heat dissipation test sample temperature sudden change low temperature test provides a standard test procedure to determine the adaptability of non-heat dissipation electrical and electronic products (including components, equipment and other products) that are not damaged by temperature sudden change. The test sample should be placed at low temperature for a long enough time to achieve temperature stability. The test duration is usually calculated from the time the sample reaches temperature stability. If this condition cannot be met, refer to Chapter 1 of the introduction. 2 General description
This test is to place the test sample with room temperature into a test box (room) with a temperature that meets the severity 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. This test usually uses forced air circulation.
3 Test equipment
3.1 Test box (room) 1. The working space should be able to provide the temperature conditions specified in 4.1, and forced air circulation can be used to maintain uniform temperature. 3.2 In order to limit the influence of radiation, the difference between the temperature of each part of the inner wall of the box (room) and the specified test temperature should not exceed 8% (calculated in Kelvin temperature), and the test sample should not be directly radiated by any heating and cooling elements that do not meet the above requirements. 4 Severity level
The severity level of the test is mainly determined by the test overflow and the test duration. The relevant specifications should be selected from the values ​​given in 4.1 and 4.2.
4.1 Temperature
--65℃13℃
-55'℃+3℃
--40℃13℃
—25℃±3℃
-10℃+3℃
-5C±3℃
-5℃±3℃
4.2 Duration
2h,16 h,72h,96h
When this standard is used as a test related to durability or reliability, the duration required for the test shall be specified by the relevant specifications. If the purpose of the test is only to check whether the test sample can work normally at low temperature, the test time is limited to the time when the sample temperature reaches stability.
5 Pretreatment
Perform in accordance with the requirements of relevant specifications.
6 Initial test
Perform visual inspection and electrical and mechanical performance tests on the test samples in accordance with relevant specifications. 4
7 Condition test
GB/T 2423. 1- -2001
7.1 Place the test samples at room temperature in the normal position or other specified position in the test chamber (room) without packaging, without power, and in the "ready to use" state. At this time, the temperature of the test chamber (chamber) is also room temperature. When the test sample is used together with a specific mounting frame, these devices should be used together during the test. The temperature measurement of the test chamber shall be carried out in accordance with the provisions of 4.4 of GB/T 2421-1.999. 7.2 Adjust the temperature of the test chamber (chamber) to a temperature value that meets the severity level, and allow sufficient time for the sample to reach temperature stability (for the definition of temperature stability, see 1.8 of GB/T2422-1995). 7.3 For functional tests, the test samples must be energized or loaded with electrical loads in accordance with the relevant specifications, and checked to determine whether they can achieve the specified functions.
If the relevant specifications require it, the test samples shall be in operation according to the specified operating cycles and load conditions (if applicable), or not powered on.
Note: At this time, the test samples are in operation or under load conditions: as long as the surface temperature does not exceed the ambient air temperature by 5K, it is considered to be non-heat dissipated. 7.4 The duration of exposure of the test samples to low temperature conditions shall be specified by the relevant specifications. The duration is calculated from the time when the temperature reaches stability. Note: For some small test samples, it is not necessary to check whether they have reached temperature stability by measuring glycerol, see GB/T 2421-1999 4-8 Method 2-. 7.5 If the relevant specifications require intermediate testing, it shall be carried out in accordance with the requirements of Chapter 8 in the first part of this standard. 7.6 At the end of the conditional test, the test samples shall be restored to their original state. For the test samples that are powered on or loaded with electrical loads, the power shall be stopped or the load shall be removed before the resumption procedure.
8 Intermediate testing
The relevant specifications may stipulate that loads and (or) measurements shall be added during or at the end of the conditional test (the test samples are still in the test box (chamber)), or the items and times of measurement shall be specified when necessary. During the measurement, the test samples shall not be taken out of the test box (chamber). Note: During the conditional 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 to be understood before the end of the duration, an additional batch of test samples shall be added for each specific time, and recovery and final measurements shall be carried out. Each batch of test samples shall be carried out separately. 9 Recovery
9.1 The test samples shall be recovered under standard atmospheric conditions until thawed. 9.2 In order to remove water droplets, the test sample can be shaken or blown with room temperature air for a short time. 9.3 When the test sample recovers under standard atmospheric conditions, the recovery time must be sufficient for it to reach temperature stability, at least 1 hour. When several samples are tested at the same time and 1 hour of recovery time is sufficient, the maximum recovery time is 2 hours. All measurements must be completed before the end of this time.
9.4 If required by the relevant specifications, the test sample must be powered or loaded during the recovery period and its performance must be measured continuously. 9.5 When standard atmospheric conditions are not suitable for the test sample, the relevant specifications may specify other recovery conditions. 10 Final inspection
Perform visual inspection and electrical and mechanical performance tests on the test sample in accordance with the provisions of the relevant specifications. 11 Information to be given in the relevant specifications
When the relevant specifications include low temperature tests, the following items should be given in as much applicable detail as possible: Instructions for use:
17IFC60068-2-"Original text 1FC60068-1 Note 2 in 4.6 should be Note 25 in 4.8 according to IEC:G0068-1
a) Preconditioning:
b) Initial test;
GB/T2423.1--2001
c) During the conditional test. The installation state of the test sample; d) Severity level (humidity and test duration): e) Measurement and (or) load during the conditional test: f) Recovery (if not under standard conditions): ) Final test;
h) Any changes to the test procedure agreed by both the supplier and the buyer. Part II Test Ab: Low temperature test of non-heat dissipation test sample temperature gradient 12 Purpose
To provide a standard test procedure to determine the adaptability of electrical and electronic products (including components, equipment and other products) for heat dissipation to be stored and (or) used at low temperatures.
The test sample should be placed at low temperature for a long enough time to achieve temperature stability. Chapter.
The test duration is usually calculated from the time when the test sample reaches temperature stability. If this condition cannot be met, refer to the introduction. 113 General instructions
This test is to put the test sample with room temperature into a test chamber (room) with room temperature, and then adjust the temperature of the test chamber (room) to the temperature value of the severe 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. This test usually uses forced air circulation. 14 Test equipment
14.1 The working space of the test chamber (room) should be able to provide the temperature conditions specified in 15.1, so as to maintain temperature uniformity by forced air circulation.
14.2 In order to limit the influence of radiation, the difference between the temperature of each part of the inner wall of the box (room) and the specified test temperature shall not exceed 8% (calculated in Kelvin temperature). The test sample shall not be directly radiated by any heating and cooling elements that do not meet the above requirements. 15 Severity level
The severity level of the test is mainly determined by the test temperature and the test duration. The relevant specifications should be selected from the values ​​given in 15.1 and 15.2.
15.1 Temperature
65-1 3℃
—55℃±3 C
—40C±3℃
—25℃+3℃
-10'℃±3℃
+5℃=3C
-5℃+3℃
15-2 Duration
2 h,1G h.72h,96 h96h96h2 In order to limit the influence of radiation, the difference between the temperature of each part of the inner wall of the box (room) and the specified test temperature should not exceed 8% (calculated in Kelvin temperature), and the test sample should not be directly radiated by any heating and cooling elements that do not meet the above requirements. 4 Severity level
The severity level of the test is mainly determined by the test overflow and the test duration. The relevant specifications should be selected from the values ​​given in 4.1 and 4.2.
4.1 Temperature
--65℃13℃
-55'℃+3℃
--40℃13℃
—25℃±3℃
-10℃+3℃
-5C±3℃
-5℃±3℃
4.2 Duration
2h,16 h,72h,96h
When this standard is used as a test related to durability or reliability, the duration required for the test shall be specified by the relevant specifications. If the purpose of the test is only to check whether the test sample can work normally at low temperature, the test time is limited to the time when the sample temperature reaches stability.
5 Pretreatment
Perform in accordance with the requirements of relevant specifications.
6 Initial test
Perform visual inspection and electrical and mechanical performance tests on the test samples in accordance with relevant specifications. 4
7 Condition test
GB/T 2423. 1- -2001
7.1 Place the test samples at room temperature in the normal position or other specified position in the test chamber (room) without packaging, without power, and in the "ready to use" state. At this time, the temperature of the test chamber (chamber) is also room temperature. When the test sample is used together with a specific mounting frame, these devices should be used together during the test. The temperature measurement of the test chamber shall be carried out in accordance with the provisions of 4.4 of GB/T 2421-1.999. 7.2 Adjust the temperature of the test chamber (chamber) to a temperature value that meets the severity level, and allow sufficient time for the sample to reach temperature stability (for the definition of temperature stability, see 1.8 of GB/T2422-1995). 7.3 For functional tests, the test samples must be energized or loaded with electrical loads in accordance with the relevant specifications, and checked to determine whether they can achieve the specified functions.
If the relevant specifications require it, the test samples shall be in operation according to the specified operating cycles and load conditions (if applicable), or not powered on.
Note: At this time, the test samples are in operation or under load conditions: as long as the surface temperature does not exceed the ambient air temperature by 5K, it is considered to be non-heat dissipated. 7.4 The duration of exposure of the test samples to low temperature conditions shall be specified by the relevant specifications. The duration is calculated from the time when the temperature reaches stability. Note: For some small test samples, it is not necessary to check whether they have reached temperature stability by measuring glycerol, see GB/T 2421-1999 4-8 Method 2-. 7.5 If the relevant specifications require intermediate testing, it shall be carried out in accordance with the requirements of Chapter 8 in the first part of this standard. 7.6 At the end of the conditional test, the test samples shall be restored to their original state. For the test samples that are powered on or loaded with electrical loads, the power shall be stopped or the load shall be removed before the resumption procedure.
8 Intermediate testing
The relevant specifications may stipulate that loads and (or) measurements shall be added during or at the end of the conditional test (the test samples are still in the test box (chamber)), or the items and times of measurement shall be specified when necessary. During the measurement, the test samples shall not be taken out of the test box (chamber). Note: During the conditional 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 to be understood before the end of the duration, an additional batch of test samples shall be added for each specific time, and recovery and final measurements shall be carried out. Each batch of test samples shall be carried out separately. 9 Recovery
9.1 The test samples shall be recovered under standard atmospheric conditions until thawed. 9.2 In order to remove water droplets, the test sample can be shaken or blown with room temperature air for a short time. 9.3 When the test sample recovers under standard atmospheric conditions, the recovery time must be sufficient for it to reach temperature stability, at least 1 hour. When several samples are tested at the same time and 1 hour of recovery time is sufficient, the maximum recovery time is 2 hours. All measurements must be completed before the end of this time.
9.4 If required by the relevant specifications, the test sample must be powered or loaded during the recovery period and its performance must be measured continuously. 9.5 When standard atmospheric conditions are not suitable for the test sample, the relevant specifications may specify other recovery conditions. 10 Final inspection
Perform visual inspection and electrical and mechanical performance tests on the test sample in accordance with the provisions of the relevant specifications. 11 Information to be given in the relevant specifications
When the relevant specifications include low temperature tests, the following items should be given in as much applicable detail as possible: Instructions for use:
17IFC60068-2-"Original text 1FC60068-1 Note 2 in 4.6 should be Note 25 in 4.8 according to IEC:G0068-1
a) Preconditioning:
b) Initial test;
GB/T2423.1--2001
c) During the conditional test. The installation state of the test sample; d) Severity level (humidity and test duration): e) Measurement and (or) load during the conditional test: f) Recovery (if not under standard conditions): ) Final test;
h) Any changes to the test procedure agreed by both the supplier and the buyer. Part II Test Ab: Low temperature test of non-heat dissipation test sample temperature gradient 12 Purpose
To provide a standard test procedure to determine the adaptability of electrical and electronic products (including components, equipment and other products) for heat dissipation to be stored and (or) used at low temperatures.
The test sample should be placed at low temperature for a long enough time to achieve temperature stability. Chapter.
The test duration is usually calculated from the time when the test sample reaches temperature stability. If this condition cannot be met, refer to the introduction. 113 General instructions
This test is to put the test sample with room temperature into a test chamber (room) with room temperature, and then adjust the temperature of the test chamber (room) to the temperature value of the severe 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. This test usually uses forced air circulation. 14 Test equipment
14.1 The working space of the test chamber (room) should be able to provide the temperature conditions specified in 15.1, so as to maintain temperature uniformity by forced air circulation.
14.2 In order to limit the influence of radiation, the difference between the temperature of each part of the inner wall of the box (room) and the specified test temperature shall not exceed 8% (calculated in Kelvin temperature). The test sample shall not be directly radiated by any heating and cooling elements that do not meet the above requirements. 15 Severity level
The severity level of the test is mainly determined by the test temperature and the test duration. The relevant specifications should be selected from the values ​​given in 15.1 and 15.2.
15.1 Temperature
65-1 3℃
—55℃±3 C
—40C±3℃
—25℃+3℃
-10'℃±3℃
+5℃=3C
-5℃+3℃
15-2 Duration
2 h,1G h.72h,96 h2 In order to limit the influence of radiation, the difference between the temperature of each part of the inner wall of the box (room) and the specified test temperature should not exceed 8% (calculated in Kelvin temperature), and the test sample should not be directly radiated by any heating and cooling elements that do not meet the above requirements. 4 Severity level
The severity level of the test is mainly determined by the test overflow and the test duration. The relevant specifications should be selected from the values ​​given in 4.1 and 4.2.
4.1 Temperature
--65℃13℃
-55'℃+3℃
--40℃13℃
—25℃±3℃
-10℃+3℃
-5C±3℃
-5℃±3℃
4.2 Duration
2h,16 h,72h,96h
When this standard is used as a test related to durability or reliability, the duration required for the test shall be specified by the relevant specifications. If the purpose of the test is only to check whether the test sample can work normally at low temperature, the test time is limited to the time when the sample temperature reaches stability.
5 Pretreatment
Perform in accordance with the requirements of relevant specifications.
6 Initial test
Perform visual inspection and electrical and mechanical performance tests on the test samples in accordance with relevant specifications. 4
7 Condition test
GB/T 2423. 1- -2001
7.1 Place the test samples at room temperature in the normal position or other specified position in the test chamber (room) without packaging, without power, and in the "ready to use" state. At this time, the temperature of the test chamber (chamber) is also room temperature. When the test sample is used together with a specific mounting frame, these devices should be used together during the test. The temperature measurement of the test chamber shall be carried out in accordance with the provisions of 4.4 of GB/T 2421-1.999. 7.2 Adjust the temperature of the test chamber (chamber) to a temperature value that meets the severity level, and allow sufficient time for the sample to reach temperature stability (for the definition of temperature stability, see 1.8 of GB/T2422-1995). 7.3 For functional tests, the test samples must be energized or loaded with electrical loads in accordance with the relevant specifications, and checked to determine whether they can achieve the specified functions.
If the relevant specifications require it, the test samples shall be in operation according to the specified operating cycles and load conditions (if applicable), or not powered on.
Note: At this time, the test samples are in operation or under load conditions: as long as the surface temperature does not exceed the ambient air temperature by 5K, it is considered to be non-heat dissipated. 7.4 The duration of exposure of the test samples to low temperature conditions shall be specified by the relevant specifications. The duration is calculated from the time when the temperature reaches stability. Note: For some small test samples, it is not necessary to check whether they have reached temperature stability by measuring glycerol, see GB/T 2421-1999 4-8 Method 2-. 7.5 If the relevant specifications require intermediate testing, it shall be carried out in accordance with the requirements of Chapter 8 in the first part of this standard. 7.6 At the end of the conditional test, the test samples shall be restored to their original state. For the test samples that are powered on or loaded with electrical loads, the power shall be stopped or the load shall be removed before the resumption procedure.
8 Intermediate testing
The relevant specifications may stipulate that loads and (or) measurements shall be added during or at the end of the conditional test (the test samples are still in the test box (chamber)), or the items and times of measurement shall be specified when necessary. During the measurement, the test samples shall not be taken out of the test box (chamber). Note: During the conditional 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 to be understood before the end of the duration, an additional batch of test samples shall be added for each specific time, and recovery and final measurements shall be carried out. Each batch of test samples shall be carried out separately. 9 Recovery
9.1 The test samples shall be recovered under standard atmospheric conditions until thawed. 9.2 In order to remove water droplets, the test sample can be shaken or blown with room temperature air for a short time. 9.3 When the test sample recovers under standard atmospheric conditions, the recovery time must be sufficient for it to reach temperature stability, at least 1 hour. When several samples are tested at the same time and 1 hour of recovery time is sufficient, the maximum recovery time is 2 hours. All measurements must be completed before the end of this time.
9.4 If required by the relevant specifications, the test sample must be powered or loaded during the recovery period and its performance must be measured continuously. 9.5 When standard atmospheric conditions are not suitable for the test sample, the relevant specifications may specify other recovery conditions. 10 Final inspection
Perform visual inspection and electrical and mechanical performance tests on the test sample in accordance with the provisions of the relevant specifications. 11 Information to be given in the relevant specifications
When the relevant specifications include low temperature tests, the following items should be given in as much applicable detail as possible: Instructions for use:
17IFC60068-2-"Original text 1FC60068-1 Note 2 in 4.6 should be Note 25 in 4.8 according to IEC:G0068-1
a) Preconditioning:
b) Initial test;
GB/T2423.1--2001
c) During the conditional test. The installation state of the test sample; d) Severity level (humidity and test duration): e) Measurement and (or) load during the conditional test: f) Recovery (if not under standard conditions): ) Final test;
h) Any changes to the test procedure agreed by both the supplier and the buyer. Part II Test Ab: Low temperature test of non-heat dissipation test sample temperature gradient 12 Purpose
To provide a standard test procedure to determine the adaptability of electrical and electronic products (including components, equipment and other products) for heat dissipation to be stored and (or) used at low temperatures.
The test sample should be placed at low temperature for a long enough time to achieve temperature stability. Chapter.
The test duration is usually calculated from the time when the test sample reaches temperature stability. If this condition cannot be met, refer to the introduction. 113 General instructions
This test is to put the test sample with room temperature into a test chamber (room) with room temperature, and then adjust the temperature of the test chamber (room) to the temperature value of the severe 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. This test usually uses forced air circulation. 14 Test equipment
14.1 The working space of the test chamber (room) should be able to provide the temperature conditions specified in 15.1, so as to maintain temperature uniformity by forced air circulation.
14.2 In order to limit the influence of radiation, the difference between the temperature of each part of the inner wall of the box (room) and the specified test temperature shall not exceed 8% (calculated in Kelvin temperature). The test sample shall not be directly radiated by any heating and cooling elements that do not meet the above requirements. 15 Severity level
The severity level of the test is mainly determined by the test temperature and the test duration. The relevant specifications should be selected from the values ​​given in 15.1 and 15.2.
15.1 Temperature
65-1 3℃
—55℃±3 C
—40C±3℃
—25℃+3℃
-10'℃±3℃
+5℃=3C
-5℃+3℃
15-2 Duration
2 h,1G h.72h,96 hWhen the test sample is used together with a specific mounting frame, the test shall be carried out together with these devices. The temperature measurement of the test chamber shall be carried out in accordance with the provisions of 4.4 of GB/T 2421-1.999. 7.2 The temperature of the test chamber (room) shall be adjusted to a temperature value that meets the severity level, and sufficient time shall be allowed for the sample to reach temperature stability (for the definition of temperature stability, see 1.8 of GB/T2422-1995). 7.3 For functional tests, the test sample must be powered or loaded with electrical loads in accordance with the relevant specifications, and checked to determine whether it can achieve the specified function.
If the relevant specifications require it, the test sample shall be in operation according to the specified operating cycle and load conditions (if feasible), or not powered.
Note: At this time, the test sample is in operation or under load conditions: as long as the surface temperature does not exceed the ambient air temperature by 5K, it is considered to be non-heat dissipated. 7.4 The duration of exposure of the test sample to low temperature conditions shall be specified by the relevant specifications. The duration is calculated from the time when the temperature reaches stability. Note: For some small test samples, it is not necessary to check whether they have reached temperature stability by measuring temperature, see GB/T 2421-1999, 4-8 Method 2-. 7.5 If the relevant specifications require intermediate testing, it shall be carried out in accordance with the requirements of Chapter 8 in the first part of this standard. 7.6 At the end of the conditional test, the test sample shall be restored to its original state. For the test sample that is powered on or loaded with electrical load, the power shall be stopped or the load shall be removed before the recovery procedure.
8 Intermediate testing
The relevant specifications may stipulate that loads and (or) measurements shall be added during or at the end of the conditional test (the test sample is still in the test chamber (room)), or the items and time of measurement shall be specified when necessary. During the measurement, the test sample shall not be taken out of the test chamber (room). Note: During the conditional test, it is not allowed to take the test sample out of the test chamber (room) for measurement before recovery and then put it back into the test chamber (room). If the performance of the test sample at a specific time is to be known before the end of the duration, an additional batch of test samples should be added for each specific time, and recovery and final testing should be carried out. Each batch of test samples should be carried out separately. 9 Recovery
9.1 The test samples should be recovered under standard atmospheric conditions until they are thawed. 9.2 In order to remove water droplets, the test samples can be shaken or blown with room temperature air for a short time. 9.3 When the test samples are recovered under standard atmospheric conditions, the recovery time should be sufficient to allow them to reach temperature stability, at least 1 hour. When several samples are tested simultaneously and 1 hour of recovery time is sufficient, the maximum recovery time is 2 hours. All measurements must be completed before the end of this time.
9.4 If required by the relevant specifications, the test samples should be powered or loaded during the recovery period and their performance should be continuously measured. 9.5 When standard atmospheric conditions are not suitable for the test samples, the relevant specifications may specify other recovery conditions. 10 Final test
The test samples should be visually inspected and tested for electrical and mechanical properties in accordance with the provisions of the relevant specifications. 11 Information to be given in the relevant specifications
When the relevant specifications include low temperature tests, the following items should be given in as much applicable detail as possible: Instructions for use:
17IFC60068-2-"Original text 1FC60068-1 Note 2 in 4.6 should be Note 25 in 4.8 according to IEC:G0068-1
a) Preconditioning:
b) Initial test;
GB/T2423.1--2001
c) During the conditional test. The installation state of the test sample; d) Severity level (humidity and test duration): e) Measurement and (or) load during the conditional test: f) Recovery (if not under standard conditions): ) Final test;
h) Any changes to the test procedure agreed by both the supplier and the buyer. Part II Test Ab: Low temperature test of non-heat dissipation test sample temperature gradient 12 Purpose
To provide a standard test procedure to determine the adaptability of electrical and electronic products (including components, equipment and other products) for heat dissipation to be stored and (or) used at low temperatures.
The test sample should be placed at low temperature for a long enough time to achieve temperature stability. Chapter.
The test duration is usually calculated from the time when the test sample reaches temperature stability. If this condition cannot be met, refer to the introduction. 113 General instructions
This test is to put the test sample with room temperature into a test chamber (room) with room temperature, and then adjust the temperature of the test chamber (room) to the temperature value of the severe 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. This test usually uses forced air circulation. 14 Test equipment
14.1 The working space of the test chamber (room) should be able to provide the temperature conditions specified in 15.1, so as to maintain temperature uniformity by forced air circulation.
14.2 In order to limit the influence of radiation, the difference between the temperature of each part of the inner wall of the box (room) and the specified test temperature shall not exceed 8% (calculated in Kelvin temperature). The test sample shall not be directly radiated by any heating and cooling elements that do not meet the above requirements. 15 Severity level
The severity level of the test is mainly determined by the test temperature and the test duration. The relevant specifications should be selected from the values ​​given in 15.1 and 15.2.
15.1 Temperature
65-1 3℃
—55℃±3 C
—40C±3℃
—25℃+3℃
-10'℃±3℃
+5℃=3C
-5℃+3℃
15-2 Duration
2 h,1G h.72h,96 hWhen the test sample is used together with a specific mounting frame, the test shall be carried out together with these devices. The temperature measurement of the test chamber shall be carried out in accordance with the provisions of 4.4 of GB/T 2421-1.999. 7.2 The temperature of the test chamber (room) shall be adjusted to a temperature value that meets the severity level, and sufficient time shall be allowed for the sample to reach temperature stability (for the definition of temperature stability, see 1.8 of GB/T2422-1995). 7.3 For functional tests, the test sample must be powered or loaded with electrical loads in accordance with the relevant specifications, and checked to determine whether it can achieve the specified function.
If the relevant specifications require it, the test sample shall be in operation according to the specified operating cycle and load conditions (if feasible), or not powered.
Note: At this time, the test sample is in operation or under load conditions: as long as the surface temperature does not exceed the ambient air temperature by 5K, it is considered to be non-heat dissipated. 7.4 The duration of exposure of the test sample to low temperature conditions shall be specified by the relevant specifications. The duration is calculated from the time when the temperature reaches stability. Note: For some small test samples, it is not necessary to check whether they have reached temperature stability by measuring temperature, see GB/T 2421-1999, 4-8 Method 2-. 7.5 If the relevant specifications require intermediate testing, it shall be carried out in accordance with the requirements of Chapter 8 in the first part of this standard. 7.6 At the end of the conditional test, the test sample shall be restored to its original state. For the test sample that is powered on or loaded with electrical load, the power shall be stopped or the load shall be removed before the recovery procedure.
8 Intermediate testing
The relevant specifications may stipulate that loads and (or) measurements shall be added during or at the end of the conditional test (the test sample is still in the test chamber (room)), or the items and time of measurement shall be specified when necessary. During the measurement, the test sample shall not be taken out of the test chamber (room). Note: During the conditional test, it is not allowed to take the test sample out of the test chamber (room) for measurement before recovery and then put it back into the test chamber (room). If the performance of the test sample at a specific time is to be known before the end of the duration, an additional batch of test samples should be added for each specific time, and recovery and final testing should be carried out. Each batch of test samples should be carried out separately. 9 Recovery
9.1 The test samples should be recovered under standard atmospheric conditions until they are thawed. 9.2 In order to remove water droplets, the test samples can be shaken or blown with room temperature air for a short time. 9.3 When the test samples are recovered under standard atmospheric conditions, the recovery time should be sufficient to allow them to reach temperature stability, at least 1 hour. When several samples are tested simultaneously and 1 hour of recovery time is sufficient, the maximum recovery time is 2 hours. All measurements must be completed before the end of this time.
9.4 If required by the relevant specifications, the test samples should be powered or loaded during the recovery period and their performance should be continuously measured. 9.5 When standard atmospheric conditions are not suitable for the test samples, the relevant specifications may specify other recovery conditions. 10 Final test
The test samples should be visually inspected and tested for electrical and mechanical properties in accordance with the provisions of the relevant specifications. 11 Information to be given in the relevant specifications
When the relevant specifications include low temperature tests, the following items should be given in as much applicable detail as possible: Instructions for use:
17IFC60068-2-"Original text 1FC60068-1 Note 2 in 4.6 should be Note 25 in 4.8 according to IEC:G0068-1
a) Preconditioning:
b) Initial test;
GB/T2423.1--2001
c) During the conditional test. The installation state of the test sample; d) Severity level (humidity and test duration): e) Measurement and (or) load during the conditional test: f) Recovery (if not under standard conditions): ) Final test;
h) Any changes to the test procedure agreed by both the supplier and the buyer. Part II Test Ab: Low temperature test of non-heat dissipation test sample temperature gradient 12 Purpose
To provide a standard test procedure to determine the adaptability of electrical and electronic products (including components, equipment and other products) for heat dissipation to be stored and (or) used at low temperatures.
The test sample should be placed at low temperature for a long enough time to achieve temperature stability. Chapter.
The test duration is usually calculated from the time when the test sample reaches temperature stability. If this condition cannot be met, refer to the introduction. 113 General instructions
This test is to put the test sample with room temperature into a test chamber (room) with room temperature, and then adjust the temperature of the test chamber (room) to the temperature value of the severe 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. This test usually uses forced air circulation. 14 Test equipment
14.1 The working space of the test chamber (room) should be able to provide the temperature conditions specified in 15.1, so as to maintain temperature uniformity by forced air circulation.
14.2 In order to limit the influence of radiation, the difference between the temperature of each part of the inner wall of the box (room) and the specified test temperature shall not exceed 8% (calculated in Kelvin temperature). The test sample shall not be directly radiated by any heating and cooling elements that do not meet the above requirements. 15 Severity level
The severity level of the test is mainly determined by the test temperature and the test duration. The relevant specifications should be selected from the values ​​given in 15.1 and 15.2.
15.1 Temperature
65-1 3℃
—55℃±3 C
—40C±3℃
—25℃+3℃
-10'℃±3℃
+5℃=3C
-5℃+3℃
15-2 Duration
2 h,1G h.72h,96 hG0068-1 should be Note 25 of 4.8
A) Preconditioning:
b) Initial test;
GB/T2423.1--2001
c) During the conditional test. The installation state of the test sample; d) Severity level (humidity and test duration): e) Measurement and (or) load during the conditional test: f) Recovery (if not restored under standard conditions): ) Final test;
h) Any changes to the test procedure agreed by both the supplier and the buyer. Part II Test Ab: Low temperature test of temperature gradient of non-heat dissipation test sample 12 Purpose
To provide a standard test procedure to determine the adaptability of electrical and electronic products (including components, equipment and other products) used for heat dissipation to be stored and (or) used at low temperatures.
The test sample should be placed at low temperature for a long enough time to achieve temperature stability. Chapter.
The test duration is usually calculated from the time when the test sample reaches temperature stability. If this condition cannot be met, refer to the introduction of Section 113 General Notes
This test is to place the test sample with room temperature in a test box (chamber) with room temperature, and then adjust the temperature of the test box (chamber) to the temperature value that meets the severity 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. This test usually uses forced air circulation. 14 Test equipment
14.1 The working space of the test box (chamber) should be able to provide the temperature conditions specified in 15.1 to maintain temperature uniformity by forced air circulation.
14.2 In order to limit the influence of radiation, the difference between the temperature of each part of the inner wall of the box (chamber) and the specified test temperature should not exceed 8% (calculated in Kelvin temperature). Ⅱ The test sample shall not be directly radiated by any heating and cooling elements that do not meet the above requirements. 15 Severity level
The severity level of the test is mainly determined by the test temperature and test duration. The relevant specifications should be selected from the values ​​given in 15.1 and 15.2.
15.1 Temperature
65-1 3℃
—55℃±3 C
—40C±3℃
—25℃+3℃
-10'℃±3℃
+5℃=3C
-5℃+3℃
15-2 Duration
2 h,1G h.72h,96 hG0068-1 should be Note 25 of 4.8
A) Preconditioning:
b) Initial test;
GB/T2423.1--2001
c) During the conditional test. The installation state of the test sample; d) Severity level (humidity and test duration): e) Measurement and (or) load during the conditional test: f) Recovery (if not restored under standard conditions): ) Final test;
h) Any changes to the test procedure agreed by both the supplier and the buyer. Part II Test Ab: Low temperature test of temperature gradient of non-heat dissipation test sample 12 Purpose
To provide a standard test procedure to determine the adaptability of electrical and electronic products (including components, equipment and other products) used for heat dissipation to be stored and (or) used at low temperatures.
The test sample should be placed at low temperature for a long enough time to achieve temperature stability. Chapter.
The test duration is usually calculated from the time when the test sample reaches temperature stability. If this condition cannot be met, refer to the introduction of Section 113 General Notes
This test is to place the test sample with room temperature in a test box (chamber) with room temperature, and then adjust the temperature of the test box (chamber) to the temperature value that meets the severity 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. This test usually uses forced air circulation. 14 Test equipment
14.1 The working space of the test box (chamber) should be able to provide the temperature conditions specified in 15.1 to maintain temperature uniformity by forced air circulation.
14.2 In order to limit the influence of radiation, the difference between the temperature of each part of the inner wall of the box (chamber) and the specified test temperature should not exceed 8% (calculated in Kelvin temperature). Ⅱ The test sample shall not be directly radiated by any heating and cooling elements that do not meet the above requirements. 15 Severity level
The severity level of the test is mainly determined by the test temperature and test duration. The relevant specifications should be selected from the values ​​given in 15.1 and 15.2.
15.1 Temperature
65-1 3℃
—55℃±3 C
—40C±3℃
—25℃+3℃
-10'℃±3℃
+5℃=3C
-5℃+3℃
15-2 Duration
2 h,1G h.72h,96 h
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.