GB/T 2423.36-1986 Basic environmental test procedures for electrical and electronic products Test Z/BFc: High temperature/vibration (sinusoidal) comprehensive test method for heat dissipation and non-heat dissipation samples
Some standard content:
National Standard of the People's Republic of China
Basic environmental testing procedures for electric and electronic productsTests Z/BFc: Combined high temperature/vibration(sinusoidal)tests for both heat -dissipating andnon-heat-dissipa ting specimensUDC 621.3:620.1
GB 2423.36-86
This standard is equivalent to the international standard (IEC68-251 (1983, first edition) "Test Z/BFc: Dry heat/vibration (sinusoidal) comprehensive test of heat dissipation and non-heat dissipation test samples". 1 Introduction
1.1. Overview
This standard is applicable to the high temperature/vibration (sinusoidal) comprehensive test of heat dissipation and non-heat dissipation test samples, which is basically a combination of test Fc: vibration (stop string) and test B: high temperature.
This test method is limited to the case where the test sample reaches temperature stability under high temperature exposure conditions. 1.2 Vibration
The moving test included in this test is basically equivalent to test Fc, which can be adopted Use one or more of the durability test procedures of test F, but this comprehensive test does not include the dynamic response check after the durability condition test. 1.3 Temperature
test The overflow condition of the heat dissipation test sample is to subject the test sample to thermal stress in the same way as free air conditions. Since it is difficult to simulate free air conditions in a test chamber with a vibrator, forced air circulation is usually used in this test. The hottest point on the surface of the test sample is used as the temperature monitoring point. Before the test, the test sample is subjected to free air conditions at a specified ambient temperature to determine the monitoring point and monitoring temperature.
1.4 Standards used simultaneously with this standard
"General Principles for Basic Environmental Testing Procedures for Electrical and Electronic Products" GB 2421--81
GB 2422-81
GB 2423.2-81
《Terminology of Basic Environmental Testing Procedure for Electric and Electronic Products》
《Basic Environmental Testing Procedure for Electric and Electronic Products Test B: High Temperature Test Method》《Basic Environmental Testing Procedure for Electric and Electronic Products Test Fc: Moving (Sinusoidal) Test Method》GB 2423.10-81
GB 2424.1-81
GB -2424.22--86
Guide》
GB 2423.22-81
2
is the "High Temperature and Low Temperature Test Guide"
"Basic Environmental Test Procedure for Electrical and Electronic Products" "Basic Environmental Test Procedure for Electrical and Electronic Products Temperature (Low Temperature, High Temperature)/Vibration (Sinusoidal) Comprehensive Test" "Basic Environmental Test Procedure for Electrical and Electronic Products Test N: Temperature Change Test Method" provides a standard test procedure to determine the adaptability of heat dissipation, non-heat dissipation components, equipment or other products under the comprehensive conditions of high temperature and movement. The National Bureau of Standards issued on July 31, 1986
1987-08-01
use, storage and transportation.
3 General description
GB2423.3686
This test is a comprehensive test of Test B: High Temperature and Test Fc: Vibration (Sinusoidal). Note: Tests Bb and Bd require that the rate of temperature change during the heating and cooling process of the conditional test shall not exceed 1°C/min (5-minute average). The maximum rate of 1°C/min is not applicable to test samples that can withstand thermal shock, that is, test samples that can usually withstand tests BaBc and can withstand rapid temperature changes in tests Na and Nc. For these test samples, a test chamber that can maintain the conditions specified in test Ba or Bc (temperature mutation) can be used. Unless the test samples have been subjected to tests B and Fc (and their test results have been recorded), they should first be subjected to vibration tests under laboratory temperature conditions and then subjected to high temperature tests until temperature stability is achieved. Afterwards, the test samples are subjected to a combined test of vibration and high temperature, and the test curves are shown in Figures 1 and 2.
Test (environment)
Test room temperature
Appearance inspection
and performance test
8 Initial test
Temperature of the test sample surface
Test chamber ambient temperature
Intermediate test (see Case 10)
9 Condition test
Test duration
Figure 1 Test curve of non-heat dissipation test sampleFigure 1 Recovery
21 Appendix
12 Final test
Temperature!
Test (environment>
Test room temperature
Electrify the sample
Appearance inspection and
Performance test
Select monitoring points and
Determine the monitoring temperature
GB 2423.36--86
8 Initial test
Temperature of the hottest point on the surface of a test specimen
Test chamber ambient temperature
Intermediate test (see Chapter 10)
9 Conditioning test
Test duration
Figure 2 Test curve diagram for heat dissipation test specimen
The vibration environment may be one or more of the following: Endurance swept frequency test.
Vibration response check and endurance test at frequencies generated by the vibration response check. Endurance test at predetermined frequencies.
Test equipment
4.1 Requirements for test chambers
4.1.1 Non-heat dissipation test specimens
This type of test chamber shall meet the requirements given in Test Ba or Bb (see Note in Chapter 3). 4.1.2 Test of heat dissipation test samples
The selection of temperature monitoring points and the determination of monitoring temperatures may be carried out in accordance with a or b below. *
11 Recovery 12 Final test
1 hour
a. Under high temperature conditions, the test chamber can simulate the effects of "free air conditions" and meet the requirements given in Chapter 28 "Test equipment" of Test Bd in Test B.
b. The test chamber (or room) can protect the test specimens from solar radiation and ventilation interference (see 6.12). The test chamber used for this test should normally be There is forced air circulation. The requirements given in Chapter 28 of Test Bc and Chapter 38 of Test Bd shall be met (Note to Chapter 3).
4.2 Requirements for the vibration system
4.2.1 Installation
The installation requirements given in Test Fc shall be met. If the test sample is heat-dissipating, the temperature of the vibration table surface is different from the ambient temperature of the test chamber, so the installation between the test sample and the moving table should have low thermal conductivity, preferably insulation. Note: When adding insulation, it should be noted that the dynamic characteristics of the test sample and the installation of the test sample do not change significantly within the test frequency range used.
4.2.2 Vibration system
GB242 3.36-86
The vibration system shall meet the requirements given in Test Fc. 5 Severity level
The severity level of vibration amplitude, frequency range and duration shall be selected from the preferred values given in Test Fc, and the temperature shall be selected from the preferred values given in Test B. The durability test shall begin when the test sample reaches temperature stability. 6 Selection of temperature monitoring points and determination of monitoring temperature (applicable only to heat dissipation test samples) 6.1 Test samples without artificial cooling
6.1.1 Use a test chamber that can simulate the effects of "free air conditions" under high temperature conditions. 6.1.1.1 The test sample shall be placed in a test chamber that meets the requirements of 4.1.2a and powered on. 6.1.1.2 The ambient temperature of the test chamber shall then be adjusted to the corresponding test severity level, and the test sample shall be allowed to reach temperature stability. Note: Temperature stability and ambient temperature are defined in GB2422-81. 6.1.1.3 The hottest point of the test sample exposed to the surrounding air should be measured and selected as the temperature monitoring point (the relevant standards should make provisions as much as possible), and the temperature of this point should be recorded and used as the monitoring temperature. Note: () If the test sample has multiple working modes, which can cause different surface temperatures, the monitoring point and monitoring temperature are usually determined under the working state that causes the highest temperature.
② It is expensive to determine the temperature monitoring point. If a large sample with a complex structure is determined, the cost will be even higher. For this case, it can only be specified in the relevant standards based on recommendations and human estimates. 6.1.2 Use a test chamber (room) that can simulate the effects of "free air conditions" only at test room temperature. If a test chamber that simulates the effects of "free air conditions" is not available at high temperatures, the following procedure may be used to select the temperature monitoring point and determine the monitoring temperature at test room temperature. 6.1.2.1 The test specimen shall be placed in a test chamber that meets the requirements of 4.1.2b and powered on. 6.1.2.2 Ensure that the test specimen reaches temperature stability. Then determine the hottest point of the test specimen exposed to the surrounding air and use it as the temperature monitoring point.
Measure the temperature of this point and the ambient temperature of the test chamber (room). 6.1.2.3 Determine the monitoring temperature of the test using the "Ambient Temperature Correction Calculation Chart" in Appendix 2 of GB2423.2--81. 6.2 Artificially cooled test specimens
6.2.1*General protective measures, terminology, see the corresponding clauses of Test Bd. 6.2.2 Cooling system is separated from the test chamber
The temperature monitoring point and monitoring temperature shall be determined in accordance with 6.1.1. In this case, the applicable method in 6.1.2 cannot be used. 6.2.3 Cooling system is not separated from the test chamber
The temperature monitoring point and monitoring temperature shall be determined in accordance with 6.2.2, except that the air inlet point into the test sample from the test chamber shall be the temperature monitoring point, and the temperature measured at that point shall be the monitoring temperature. 7 Pretreatment
Pretreatment may be required by the relevant standard.
8 Initial testing
When required by the relevant standard, the test sample shall be visually inspected and the electrical and mechanical properties shall be tested. 9 Conditioning test
The relevant standard shall specify that vibration shall be performed in one or several axes of the test sample. When vibration is specified in several axes during the entire conditioning test, the entire test procedure shall be repeated in each specified axis. 352
GB 2423.36--86
If the test specimen is provided with a cooling system, the cooling system shall be used when the test specimen is powered at any stage during the conditioning test. If Tests B and F are not carried out and their results recorded, the procedures given in 9.1 and 9.2 shall be followed. 9.1 Vibration test at laboratory temperature The test specimen is mounted on a vibration table and, when required by the relevant standard, the test specimen is powered. After temperature stabilization is achieved, the test specimen is subjected to the specified level of vibration. When required by the relevant standard, the test specimen is subjected to performance testing. When an endurance sweep test is specified, a sweep cycle shall be carried out within the specified frequency range. When an endurance test at the frequency obtained by the vibration response check is specified, a sweep cycle shall be carried out within the specified frequency range during the vibration response check, the amplitude of which shall be specified by the endurance test at the frequency obtained by the vibration response check. Note: In order to simplify the vibration response check at high temperature, the vibration response associated with the sweep test may be studied at laboratory temperature. When the endurance test is specified to be carried out at a predetermined frequency, it is to be maintained at each specified frequency of the specified amplitude for observation, but the duration is shorter than the specified test duration.
9.2 High temperature test without movement
9.2.1 Test of non-heat dissipation test sample
The temperature of the test chamber shall be raised to the specified test value, and the duration shall be such that the test sample reaches temperature stability. 9.2.2 Test of heat dissipation test sample
The test sample is powered on, and the temperature of the test chamber is raised to the monitoring point temperature within ±2°C of the monitoring temperature determined in Chapter 6. 9.2.3 If required by the relevant standards, performance testing can be carried out after reaching temperature stability. Note: If the test sample has multiple working modes that can cause different surface temperatures, the performance test should be carried out in the working mode that causes the highest temperature at the monitoring point. 9.3 Temperature/vibration comprehensive test
9.3.1 After the test sample reaches temperature stability according to 9.2, it is vibrated according to the specified level and duration. The relevant standards should specify whether the test sample is powered on or working during this test. 9.3.2 The relevant standard shall specify which test procedure of test Fc must be used. a. Endurance swept frequency test
b. Endurance test at the frequencies generated by the vibration response check. This requires that a vibration response check must be carried out before the endurance conditioning test. A vibration response check is not required at the end of the conditioning test, but it may be recommended. In this case, the relevant standard for the test sample should state this. During the endurance conditioning test, the excitation frequency must be adjusted to ensure maximum response. Endurance test at a predetermined frequency
Note: If the relevant standard requires the test sample to be operated in different working modes, which will cause different surface temperatures, the ambient temperature shall be maintained at the level achieved in the test part described in 9.2. 9.3.3 The vibration is then stopped. If the test sample was powered during the conditioning test, the power supply should be disconnected at this time. The test sample shall remain in the test chamber and the temperature shall be slowly reduced to normal test atmospheric conditions. Thereafter, the test sample shall be subjected to a recovery procedure in the test chamber or as specified in the relevant standard.
10 Intermediate test
See test B.
11 Recovery
See test B.
12 Final test
Perform visual inspection and electrical and mechanical property tests on the test samples as required by the relevant standards. 13 Failure criteria
Failure criteria shall be specified by the relevant standards.
Relevant standards shall be consistent with relevant contents
GB 2428.$6-86
When the relevant standard adopts this test, the following details required by test B and test Fc must be given: a.
Rate of temperature change: sudden change (test Ba or Bc) or gradual change (test Bb or Bd) Details of installation and support
See 4.2.1.
Severity level: temperature, amplitude, test duration and frequency range or predetermined frequency preconditioning
See Chapter 7.
Initial test
Axis of vibration
See Clause 8.
See Clause 9.
State of the test specimen during the conditioning test
Performance test
See 9.1, 9.3.1.
See Clause 3.
See Clause 5.
Vibration test procedure (endurance sweep test, endurance test at response frequency, endurance test at predetermined frequency) See 9.3.26 for the options allowed.
Note:!
Non-standard recovery
See Clause 11.
Testing and loading during the conditioning test
Final test
Failure criteria
Additional remarks:
See Clause 12.
See Chapter 13.
See Chapter 10.
This standard is proposed by the National Technical Committee for Standardization of Environmental Conditions and Environmental Testing for Electrical and Electronic Products. This standard is drafted by the Temperature/Vibration (Sinusoidal) Comprehensive Test Working Group of the "Environmental Standardization Committee". 3541 Vibration test at laboratory temperature The test sample is mounted on the vibration table and, when required by the relevant standard, the test sample is energized. After reaching temperature stability, the test sample is subjected to the specified level of vibration. When required by the relevant standard, the test sample is subjected to performance testing. When an endurance sweep test is specified, a sweep cycle is performed within the specified frequency range. When an endurance test at the frequency obtained by the vibration response check is specified, a sweep cycle of the specified frequency range should be performed during the vibration response check, and the amplitude should be specified by the endurance test at the frequency obtained by the vibration response check. Note: In order to simplify the vibration response check at high temperature, the vibration response associated with the sweep test can be studied at laboratory temperature. When an endurance test at a predetermined frequency is specified, it is maintained at each specified frequency with a specified amplitude for observation, but the duration is shorter than the specified test duration.
9.2 High temperature test without movement
9.2.1 Test of non-heat dissipation test sample
The temperature of the test chamber shall be raised to the specified test value and the duration shall be sufficient to allow the test sample to reach temperature stability. 9.2.2 Test of heat dissipation test samplewwW.bzxz.Net
The test sample is powered on and the temperature of the test box is raised to within ±2°C of the monitoring point temperature determined in Chapter 6. 9.2.3 If required by the relevant standard, performance testing can be carried out after temperature stabilization is achieved. Note: If the test sample has multiple working modes that can cause different surface temperatures, the performance test should be carried out in the working mode that causes the highest temperature at the monitoring point. 9.3 Temperature/vibration comprehensive test
9.3.1 After the test sample reaches temperature stabilization in accordance with 9.2, it is vibrated at the specified level and duration. The relevant standard should specify whether the test sample is powered or working during this test. 9.3.2 The relevant standard should specify which test procedure of test Fc must be used. a. Endurance sweep frequency test
b. Endurance test at the frequency generated by the vibration response check. This requires that a vibration response check must be carried out before the durability condition test. A vibration response check is not required at the end of the condition test, but it can be recommended. In this case, the relevant standard of the test sample should state this. During the endurance conditioning test, the excitation frequency must be adjusted to ensure maximum response. Endurance test at a predetermined frequency
Note: If the relevant standard requires the test specimen to be operated in different working modes, which will cause different surface temperatures, the ambient temperature shall be maintained at the level achieved in the test part described in 9.2. 9.3.3 The vibration is then stopped. If the test specimen is powered during the conditioning test, the power supply shall be disconnected at this time. The test specimen shall remain in the test chamber and the temperature shall be slowly reduced to normal test atmospheric conditions. Thereafter, the test specimen shall be subjected to a recovery procedure in the test chamber or as specified in the relevant standard.
10 Intermediate test
See test B.
11 Recovery
See test B.
12 Final test
The test specimen shall be visually inspected and tested for electrical and mechanical properties as required by the relevant standard. 13 Failure criteria
The failure criteria shall be specified by the relevant standard.
Contents to be included in the relevant standards
GB 2428.$6-86
When the relevant standards adopt this test, the following details required for Test B and Test Fc must be given: a.
Rate of temperature change: sudden change (Test Ba or Bc) or gradual change (Test Bb or Bd) Details of installation and support
See 4.2.1.
Severity level: temperature, amplitude, test duration and frequency range or predetermined frequency preconditioning
See Chapter 7.
Initial test
Axial direction of vibration
See Chapter 8.
See Chapter 9.
State of the test sample during the conditional test
Performance test
See 9.1, 9.3.1.
See 9, 9.1, 9.3.1.
See Chapter 3.
See Chapter 5.
Vibration test procedures (endurance sweep frequency test, endurance test at response frequency, endurance test at predetermined frequency) See the options allowed in 9.3.26.
Note:!
Non-standard recovery
See Chapter 11.
Detection and load during conditional test
Final inspection
Failure criteria
Additional instructions:
See Chapter 12.
See Chapter 13.
See Chapter 10.
This standard is proposed by the National Technical Committee for Standardization of Environmental Conditions and Environmental Testing for Electrical and Electronic Products. This standard was drafted by the Temperature/Vibration (Sinusoidal) Comprehensive Test Working Group of the "Environmental Standardization Committee". 3541 Vibration test at laboratory temperature The test sample is mounted on the vibration table and, when required by the relevant standard, the test sample is energized. After reaching temperature stability, the test sample is subjected to the specified level of vibration. When required by the relevant standard, the test sample is subjected to performance testing. When an endurance sweep test is specified, a sweep cycle is performed within the specified frequency range. When an endurance test at the frequency obtained by the vibration response check is specified, a sweep cycle of the specified frequency range should be performed during the vibration response check, and the amplitude should be specified by the endurance test at the frequency obtained by the vibration response check. Note: In order to simplify the vibration response check at high temperature, the vibration response associated with the sweep test can be studied at laboratory temperature. When an endurance test at a predetermined frequency is specified, it is maintained at each specified frequency with a specified amplitude for observation, but the duration is shorter than the specified test duration.
9.2 High temperature test without movement
9.2.1 Test of non-heat dissipation test sample
The temperature of the test chamber shall be raised to the specified test value and the duration shall be sufficient to allow the test sample to reach temperature stability. 9.2.2 Test of heat dissipation test sample
The test sample is powered on and the temperature of the test box is raised to within ±2°C of the monitoring point temperature determined in Chapter 6. 9.2.3 If required by the relevant standard, performance testing can be carried out after temperature stabilization is achieved. Note: If the test sample has multiple working modes that can cause different surface temperatures, the performance test should be carried out in the working mode that causes the highest temperature at the monitoring point. 9.3 Temperature/vibration comprehensive test
9.3.1 After the test sample reaches temperature stabilization in accordance with 9.2, it is vibrated at the specified level and duration. The relevant standard should specify whether the test sample is powered or working during this test. 9.3.2 The relevant standard should specify which test procedure of test Fc must be used. a. Endurance sweep frequency test
b. Endurance test at the frequency generated by the vibration response check. This requires that a vibration response check must be carried out before the durability condition test. A vibration response check is not required at the end of the condition test, but it can be recommended. In this case, the relevant standard of the test sample should state this. During the endurance conditioning test, the excitation frequency must be adjusted to ensure maximum response. Endurance test at a predetermined frequency
Note: If the relevant standard requires the test specimen to be operated in different working modes, which will cause different surface temperatures, the ambient temperature shall be maintained at the level achieved in the test part described in 9.2. 9.3.3 The vibration is then stopped. If the test specimen is powered during the conditioning test, the power supply shall be disconnected at this time. The test specimen shall remain in the test chamber and the temperature shall be slowly reduced to normal test atmospheric conditions. Thereafter, the test specimen shall be subjected to a recovery procedure in the test chamber or as specified in the relevant standard.
10 Intermediate test
See test B.
11 Recovery
See test B.
12 Final test
The test specimen shall be visually inspected and tested for electrical and mechanical properties as required by the relevant standard. 13 Failure criteria
The failure criteria shall be specified by the relevant standard.
Contents to be included in the relevant standards
GB 2428.$6-86
When the relevant standards adopt this test, the following details required for Test B and Test Fc must be given: a.
Rate of temperature change: sudden change (Test Ba or Bc) or gradual change (Test Bb or Bd) Details of installation and support
See 4.2.1.
Severity level: temperature, amplitude, test duration and frequency range or predetermined frequency preconditioning
See Chapter 7.
Initial test
Axial direction of vibration
See Chapter 8.
See Chapter 9.
State of the test sample during the conditional test
Performance test
See 9.1, 9.3.1.
See 9, 9.1, 9.3.1.
See Chapter 3.
See Chapter 5.
Vibration test procedures (endurance sweep frequency test, endurance test at response frequency, endurance test at predetermined frequency) See the options allowed in 9.3.26.
Note:!
Non-standard recovery
See Chapter 11.
Detection and load during conditional test
Final inspection
Failure criteria
Additional instructions:
See Chapter 12.
See Chapter 13.
See Chapter 10.
This standard is proposed by the National Technical Committee for Standardization of Environmental Conditions and Environmental Testing for Electrical and Electronic Products. This standard was drafted by the Temperature/Vibration (Sinusoidal) Comprehensive Test Working Group of the "Environmental Standardization Committee". 3541.
See Chapter 3.
See Chapter 5.
Vibration test procedures (endurance sweep frequency test, endurance test at response frequency, endurance test at predetermined frequency) See the options allowed in 9.3.26.
Note:!
Non-standard recovery
See Chapter 11.
Detection and load during condition test
Final inspection
Failure criteria
Additional instructions:
See Chapter 12.
See Chapter 13.
See Chapter 10.
This standard is proposed by the National Technical Committee for Standardization of Environmental Conditions and Environmental Testing for Electrical and Electronic Products. This standard was drafted by the Temperature/Vibration (Sinusoidal) Comprehensive Test Working Group of the "Environmental Standardization Committee". 3541.
See Chapter 3.
See Chapter 5.
Vibration test procedures (endurance sweep frequency test, endurance test at response frequency, endurance test at predetermined frequency) See the options allowed in 9.3.26.
Note:!
Non-standard recovery
See Chapter 11.
Detection and load during condition test
Final inspection
Failure criteria
Additional instructions:
See Chapter 12.
See Chapter 13.
See Chapter 10.
This standard is proposed by the National Technical Committee for Standardization of Environmental Conditions and Environmental Testing for Electrical and Electronic Products. This standard was drafted by the Temperature/Vibration (Sinusoidal) Comprehensive Test Working Group of the "Environmental Standardization Committee". 354
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