GB/T 2424.13-2002 Environmental testing for electric and electronic products Part 2: Test method Temperature change test guide
Some standard content:
Hs 17.040
National Standard of the People's Republic of China
CB/T 2424.13—2002/IEC 60068-2-33:1971Replaces GB/12319
Environmental testing for eleciric and electronic products
Part 2:Test methods
Guidance on change of temperature change test
Environmental lesting for eleciric and electronic productsFari 2:Tesl methods-Guidance on change of temperaturc lests(1C B0uu8-2-33:197l,Basie environmental testing Jrnredures-Part 2:Itests Guidance on change of icmjetture tesis,jTitj20020613 issue
People's Republic of China
National Clinical Inspection and Quarantine Bureau
2003-01-01 implementation
Temperature change conditions on site
Differences
Multiple 1 limit shift test
Selection of test date and test method 3.3: Selection of test date within exposure time
3.5 Use of the same temperature change test
4 Reproducibility of temperature change test
2.1 Effect of test conditions on test procedure
4. Influence of test articles
Guide to selection of test light
H/T 7424.132002/1E: ECC58-2-33:1571
GB/T2424-13—2002/IFC60068-2-33,1971 Foreword
GF2424 This part adopts IFC26-2-:1S71 electrical system environmental test method and test method temperature change test guide British version and our regular car [8. Repair parts certificate 5 Central Office No. 9 document. Parts of the product marked with double monitoring line, 600e8-2%%:1971 Repair parts 1.117 The situation of this part is GB/T2424.13·1%814 Basic environmental test regulations for electric and electronic products Part 2: Test methods and test guidelines for temperature changes
part of GB/T4.13-:991 is consistent with the name of the international standard GB/T221 series of environmental test standards for electric and electronic products. The name of this part is the first part of the test method and the test guide for temperature changes. R/2124.13-1981 is equivalent to the international standard FC.668-%-8:1971 Basic environmental test regulations for electric and electronic products Part 1:Test methods and test guidelines for temperature changes? and its standard 1:97R. In the standard approval, editing and formatting method, it is different from 1EC63963-2-$3:1S71. For example, G242-1-11 is for 11 years, and the environmental protection department has expanded it. This part is 6 Zhuo
based on 1, 11.12 center standardization work, etc. Part 1: Standard structure and writing rules 1. In the adoption of the standard "for the use of non-national standards, the results are consistent with the international standards used", this part is not included in the proposal, the structure and order of the standard are consistent with TEECC-231S, etc. This part is in the editing, only for the period of time, like the makeup
part 1: This part is changed to the previous version of the national standard for material purification. There are:
i2233: Electrical and electronic product external burn-in test: test Q secret ID: [E: uu8-2-17CB door 23.1): 1 electric hand product is not in the environment or test test F: and guide: multi-sine id1FC5626T2423.3 electrical and electronic product environmental test according to the standard humidity (1 buy Ct68--)G/2.1.11 sub-product environmental test alternating current heat stop CG3-2-3 This standard is proposed by China Electrical Equipment Industry Association
This standard is issued by the National Environmental System and Environmental Testing Standardization Technical Committee for Sub-Products (CSB This standard is derived from: State Electric Science and Technology Research Institute of this standard. The version of this standard is: (2121.13-1981:
1 Introduction
CB/I 2424.132002/1EC60068-2-33:1971 Environmental testing of electronic products
Part 2: Test methodsGuidelines for temperature change tests This guideline is intended to provide guidance to those designing dosage forms for use in the design of temperature change tests: Simple temperature change tests are related to the study of the effects of high or low temperature on the product under test conditions. This guideline is not intended to be used solely to assess the effects of high or low temperatures. This effect must be determined by the following conditions:
The temperature change conditions are: - the product is selected to maintain the test conditions under this temperature; - the rate of change of product to low (or high) temperature; - the efficacy of the test product in a cycle test:
- the sample is introduced into the test Or the total heat input, the temperature change in electrical equipment and components is often a gradual change. When the equipment is not in operation, the temperature changes of the internal parts of the equipment will be slower than those of the external parts. Therefore, the temperature change can change the equipment from the warmest indoor environment to the coldest outdoor environment or the opposite situation: when the equipment is in use or there is no cooling system, the board is installed in the external equipment, and there is a certain temperature gradient in the equipment. When the humidity changes, for example: when the equipment is in operation near a high output power, the temperature of the adjacent parts will rise while the other parts are cold. 1. Cooling components are designed to be subjected to changes in speed when the cooling system is in operation. The main factors affecting the change in speed are the change in the frequency of the change and the time interval between them. When the change is not 2~3m, the heat stress on the test sample is much smaller than that on the large test sample. However, the heat stress experienced by the test sample is related to the temperature and limit of the test on the components and equipment. When the components or equipment are exposed to the sun or the bottle is frozen, additional stress will be generated. If these external forces are not desired, the humidity must be properly controlled to reduce their influence. 1
37C07/1FC60068-2-33:1971
GB/T 2224.13
3 Basic principles
3 Design of temperature variation test
(K223.22-10U temperature variation test Na, N and Ne are combined with alternating high and low temperature periods. The transition from one condition to the clock temperature is specified in a specific time. From the actual temperature to the first condition test temperature, and then to the second condition test, the temperature is returned to the fixed temperature. This treatment is considered as a test cycle-3.1.1 Test book - number
· Room:
Business benefits:
One should return!
One time:
One return between two extremes: Test adjustment efficiency bzxZ.net
High and low temperature products indicate that the majority of test samples will reach these maximum values, and after a certain period of time: Only under exceptional conditions, the test items are specified to be stored or operated outside the normal storage or working temperature range. The temperature change test is an adverse test, because the number of changes to the humidity point in a given time is greater than that occurring under field conditions. 3? The choice of test date and test method is not a test of the floor system components intended for field use. The stress of the test samples shall be given within the age of 1 day in the temperature change test to ensure that their design and manufacture are as correct as possible. 3.2.1 In the following cases, the temperature change test shall be carried out: 3.2.1.1 To evaluate the exhaust energy during the temperature change, use test 45. 3.2.1.2 To evaluate the heat injection of the machine during the temperature change, use test 53.2.1.2 to verify the electrical properties after the specified sudden change in the disk. Use test Na or test N=. 3.2.1.4 To evaluate the adaptability of the mechanical product to the combination of materials and materials to the rapid change in temperature, use test N or test V. 3.2.1.5 To evaluate the adaptability of the structure of the component to the artificial force, use test N or test Nc. 3.2-2 The temperature change test specified in G3/212 shall not be used to evaluate the test time or electrical performance when working in a stable state with two damage bands. 3-3 Selection of exposure time
The effective time depends on the test sample (or the damaged part of the product) reaching the ambient temperature. Therefore, the thermal time constant of the test sample is repeated. The thermal time constant of the test sample (the internal and external thermal time constant of the equipment may be greatly different. The thermal time constant of the exposed part is taken as the thermal time constant of the test surface: The thermal time constant of the test product is taken as the medium (in the test medium, the air in the test medium, the liquid ... The rack is tested under the same conditions during the test. When the maximum time is selected, the following shall apply (see 1):
If 5 01
If 2.5m0.11
In:
The thermal band of the test sample!
The difference between the test medium temperature and the test sample temperature: The difference between the test temperature under hot and cold conditions.
3.4 Selection of temperature change time
3.4.1 Selection of conversion time
F Range
GB/T 2424.13--2002/[EC60D68233:19711=0
At the beginning of the test, if the test product is large and cannot be converted within (2~3)1, the conversion time can be extended to,
if there is no significant impact on the test results,
where:
When converting:
Thermal time value of the test product,
3.4.2 Selection of temperature change rate
Tester h The temperature change rate given is suitable for simulating the rapid changes mentioned in Chapter 2. There are also slower temperature changes, such as those related to the temperature rise. This change is usually less than 100 m. This simulation is meaningful when the equipment is running smoothly. In this case, test N can be used, but the temperature change rate should be appropriately reduced. 3.5 Applicable factors for temperature change tests
3-5.1 The rate of temperature change within a test sample depends on the material, its thermal conductivity, The temperature change at a certain point on the surface of the test sample is generally sufficient to comply with the following conditions. In large test samples, such cross-indices may overlap, resulting in a long-term temperature change, which is much smaller than the applied temperature.
3.5.2 In the temperature change test, the test sample and the test error (the temperature change caused by the fluid or the thermal flow) should be considered. The rate of change is very high, while the temperature change rate of the test sample in static air is very low. 3.5.3 Use water as the test condition (test N) for the test sample. The test sample should be sensitive to water or not. The addition of water will deteriorate its performance and parameters. In special cases, such as test products that are sensitive to water, it may be necessary to specify a test medium other than pure water. When other test mediums are used, the heat transfer characteristics of the test liquid and the maintenance of water should be considered. Position: To determine whether the water volume is reversed or not - only the test results can be determined in accordance with the method of G2122.23-10051 B12424.13:2002/IEC60068-2-33:1974 Reproducibility of temperature change test
1.1 Influence of test procedure
Reproducibility of test. The above test parameters are obtained by: a) Temperature change of the surrounding medium;
High and low temperatures:
") Heat transfer mechanism (heat convection, heat radiation, heat transfer! d) Test value transport characteristics.
Any information that affects the reproducibility of the test, such as the position and orientation of the test product in or outside the test, shall be specified in the relevant specifications:
4.2 Influence of the test article | |tt|| The test results are difficult to change. Due to the difference in the number of test items, the following factors may affect the test results: 1) thermal penetration:
b) the distribution of heat on the surface of the test sample: 2) the conduction of heat inside the test sample is uneven; 3) the thermal expansion of the components and materials that constitute the test sample; 4) mechanical properties (such as the components of the test sample and the compressibility and strength of the material! 5) dimensions and their tolerances;
g1 other factors that affect the distribution of temperature inside the test sample. The selection of the number of test samples can affect the understanding of the test results. The above factors can be used as a guide. 5 Guidance for the selection of test types
5.1 The intensity of the test increases with the following factors. a) Increase in temperature:
b) Acceleration of the rate of temperature change:
) Rapid heat transfer Machine.
The required test sample performance data should be specified as early as possible and the corresponding minimum severity level of the test. 5-2 Test N is preferably used as part of the sequence test. Some losses are manifested in the measurement of the first test, but may only be manifested in the subsequent test period. Tests such as: Test: Sealing (G3/T2.3.23), Test C: Constant heat GR/T2423.1) Test C: Constant heat GT/T3423.1). 5, Swimming temperature change test monitor 5.4 Whenever possible, the conditional test time should be selected according to the total number of cycles configured for each workpiece or 24 hours, and take into account the time for the test after the test. If the above reasons are not found, the time should be slightly raised during the test plan: Some space will be tested. The test is carried out according to the requirements of the test method. The test results are as follows: 1. The test results are as follows: 2. The test results are as follows: 3. 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The test results are as follows: 31. The test results are as follows: 32. The test results are as follows: 33. The test results are as follows: 34. The test results are as follows: 35. The test results are as follows: 36. The test results are as follows: 37. The test results are as follows: 38.2 In the temperature change test, the test sample and the test sample surface should be considered to have a very high rate of change. In the static air, the test sample has a low rate of temperature change. 3.5.3 The two-water method (test N) using water as the test condition requires the use of test products that are not sensitive to water or test samples that are not sensitive to water. The addition of water will cause their performance and parameters to deteriorate. In special cases, such as test products that are sensitive to water, it may be necessary to specify pure When testing with other fluids other than clean water, the heat transfer characteristics of the fluid and the maintenance of the water should be considered. 1.1 Effect of test procedure on the reproducibility of the test procedure. 2.2.23-10051. 3.2.1.1 Effect of test procedure on the reproducibility of the test procedure. 4.2.1 ... The pilot test shall be carried out to determine the accuracy of the parameters listed above: the changes in the above test parameters are mainly affected by a) changes in the temperature of the surrounding medium; high and low temperatures: heat transfer mechanisms (convection, radiation, heat conduction) d) test characteristics. Any information that affects the reproducibility of the test, such as the position and orientation of the test article in or outside the test chamber, shall be specified in the relevant specifications: 4.2 Influence of the test article on the surface variation test Results. The following factors may affect the distribution of temperature inside the test sample due to differences in the following aspects: a) thermal penetration: b) distribution of heat on the surface of the test sample: 1) uneven conduction of heat inside the test sample; 2) thermal expansion of the components and materials that constitute the test sample; 3) mechanical properties (such as the components of the test sample and the compressibility and strength of the material); 4) dimensions and their tolerances; 5) other factors that affect the distribution of temperature inside the test sample. The above factors can be used as a guide for the selection of the number of test samples and the understanding of the test results. 5. Guidance for the selection of test types 5.1 The severity of the test increases with the following factors: a) increase in temperature: b) acceleration of the rate of temperature change: d) faster heat transfer. The required number of test sample properties and the corresponding minimum severity level of the test should be specified. 5-2 Test N is preferred as part of the sequence test. Some of the damage caused by the test is shown in the first measurement of the test, but may only be shown in the subsequent test period. Tests such as: Test: Sealing (G3/T2.3.23), Test C: Constant temperature (GB/T2423.1) Test C: Constant temperature (GR/T2423.2). Test: Real time damp heat (GT/T34231). 5. The test method is not clear. The tester is open. 5.4 Whenever possible, the test time should be selected according to the total number of cycles configured for each workpiece or 24 hours, and take into account the time for the test after the test. If the above reasons are not found, the test time should be slightly increased during the test plan: Some spaces will be tested. The regulations stipulate that when the products are kept in the atmosphere for a long time during the day, they should be kept in a low-temperature box, because the long-term use in the hot air environment may produce small amounts of suspended solids.
5.5 During the temperature change test, the properties of the products and their performance under the influence of temperature change conditions may be damaged, and the initial and final test items are determined based on this. Under certain conditions, it is sufficient to only test the machine. Especially for the modification of the temperature change test, the performance test during the temperature change test should be considered first. 6 Conclusion
GB/T2424.13—2002/1EC60068-2-33.1971 The temperature change test is an extremely cautious matter. Its success depends on the technical parameters and performance of the test samples and the differences in performance under rapid changes in temperature.2 In the temperature change test, the test sample and the test sample surface should be considered to have a very high rate of change. In the static air, the test sample has a low rate of temperature change. 3.5.3 The two-water method (test N) using water as the test condition requires the use of test products that are not sensitive to water or test samples that are not sensitive to water. The addition of water will cause their performance and parameters to deteriorate. In special cases, such as test products that are sensitive to water, it may be necessary to specify pure When testing with other fluids other than clean water, the heat transfer characteristics of the fluid and the maintenance of the water should be considered. 1.1 Effect of test procedure on the reproducibility of the test procedure. 2.2.23-10051. 3.2.1.1 Effect of test procedure on the reproducibility of the test procedure. 4.2.1 ... The pilot test shall be carried out to determine the accuracy of the parameters listed above: the changes in the above test parameters are mainly affected by a) changes in the temperature of the surrounding medium; high and low temperatures: heat transfer mechanisms (convection, radiation, heat conduction) d) test characteristics. Any information that affects the reproducibility of the test, such as the position and orientation of the test article in or outside the test chamber, shall be specified in the relevant specifications: 4.2 Influence of the test article on the surface variation test Results. The following factors may affect the distribution of temperature inside the test sample due to differences in the following aspects: a) thermal penetration: b) distribution of heat on the surface of the test sample: 1) uneven conduction of heat inside the test sample; 2) thermal expansion of the components and materials that constitute the test sample; 3) mechanical properties (such as the components of the test sample and the compressibility and strength of the material); 4) dimensions and their tolerances; 5) other factors that affect the distribution of temperature inside the test sample. The above factors can be used as a guide for the selection of the number of test samples and the understanding of the test results. 5. Guidance for the selection of test types 5.1 The severity of the test increases with the following factors: a) increase in temperature: b) acceleration of the rate of temperature change: d) faster heat transfer. The required number of test sample properties and the corresponding minimum severity level of the test should be specified. 5-2 Test N is preferred as part of the sequence test. Some of the damage caused by the test is shown in the first measurement of the test, but may only be shown in the subsequent test period. Tests such as: Test: Sealing (G3/T2.3.23), Test C: Constant temperature (GB/T2423.1) Test C: Constant temperature (GR/T2423.2). Test: Real time damp heat (GT/T34231). 5. The test method is not clear. The tester is open. 5.4 Whenever possible, the test time should be selected according to the total number of cycles configured for each workpiece or 24 hours, and take into account the time for the test after the test. If the above reasons are not found, the test time should be slightly increased during the test plan: Some spaces will be tested. The regulations stipulate that when the products are kept in the atmosphere for a long time during the day, they should be kept in a low-temperature box, because the long-term use in the hot air environment may produce small amounts of suspended solids.
5.5 During the temperature change test, the properties of the products and their performance under the influence of temperature change conditions may be damaged, and the initial and final test items are determined based on this. Under certain conditions, it is sufficient to only test the machine. Especially for the modification of the temperature change test, the performance test during the temperature change test should be considered first. 6 Conclusion
GB/T2424.13—2002/1EC60068-2-33.1971 The temperature change test is an extremely cautious matter. Its success depends on the technical parameters and performance of the test samples and the differences in performance under rapid changes in temperature.
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