GB/T 2423.35-1986 Basic environmental test procedures for electric and electronic products Test Z/AFc: Low temperature/vibration (sinusoidal) comprehensive test method for heat dissipation and non-heat dissipation test samples
Some standard content:
National Standard of the People's Republic of China
Basic environmental testing proceduresfor electric and electronic productsTests Z/AFc, Combined low temperature/vibration (sinusoidal) tests for bothheat -dissi pating and non - heat -dissipating specimens
UDC 621.3 :620.1
GB 2423.35--86
This standard is equivalent to the International Electrotechnical Commission IEC68-2-50 (1983 Edition) "Test Z/AFc: Combined low temperature/vibration (sinusoidal) test for bothheat -dissi pating and non - heat -dissipating specimens". 1 Introduction
1.1 General
This standard applies to the combined low temperature/vibration (sine) test of heat-dissipating and non-heat-dissipating test specimens and is essentially a combination of Test Fc: Vibration (sine) and Test A: Low Temperature.
This test method is limited to the case where the test specimens have reached temperature stability after low temperature exposure. 1.2 Vibration
The vibration test included in this test is essentially equivalent to Test Fc: one or more of the endurance test procedures of Test Fc may be used, but this combination of tests does not include a check of the vibration response after the endurance condition test. 1.3 Temperature
The temperature condition of the heat-dissipating test specimens is such that the test specimens are subjected to thermal stress in the same manner as free air conditions. Forced air circulation is usually used in this test because of the difficulty in simulating free air conditions in a test chamber with a vibrator. The hottest point on the test specimen surface is used as the temperature monitoring point. Prior to the test, the test specimen is subjected to free air conditions at a specified ambient temperature to determine the temperature monitoring point and the monitoring temperature.
1.4 Standards used concurrently with this standard
GB2421—81
General Rules for Basic Environmental Testing Procedures for Electric and Electronic Products GB2422—81
Terms and Terms for Basic Environmental Testing Procedures for Electric and Electronic Products GB2423.1—81 Basic Environmental Testing Procedures for Electric and Electronic Products Test A: Low Temperature Test Method GB 2423.10—81
GB 2424.1---81
GB 2424.22-86
GB 2423.22-81
"Basic environmental test procedures for electric and electronic products, test Fc: vibration (sinusoidal) test method" "Basic environmental test procedures for electric and electronic products, high temperature and low temperature test guidelines"
"Basic environmental test procedures for electric and electronic products, temperature (low temperature, high temperature)/vibration (sinusoidal) comprehensive test guidelines"
"Basic environmental test procedures for electric and electronic products, issued by the National Bureau of Standards on July 31, 1986
Test N: Temperature change test method"
Implementation on August 1, 1987
2 Purpose
GB2423.35--86
Provides a standard test procedure to determine the adaptability of heat dissipation, non-heat dissipation components, equipment or other products under the combined conditions of low temperature and vibration for use, storage and transportation.
3—General description
This test is a combination of Test A: Low temperature and Test Fc: Vibration (sinusoidal). Note: Tests Ab and Ad require that the rate of temperature change during the heating and cooling of the conditioning test does not exceed 1°C/min (5 min 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 normally withstand test Aa 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 Aa (temperature surge) can be used. Unless the test samples have been subjected to tests A and Fc (and their test results recorded), they should first be subjected to vibration tests at room temperature and then to low temperature tests until temperature stability is achieved. After that, the test samples are subjected to a combination of vibration and low temperature tests. The test curves are shown in Figures 1 and 2.
Temperature"8 Initial test
Test room temperature
Test (environment》
Appearance inspection and
Performance inspection
Surface temperature of test sample
Test chamber ambient temperature
Intermediate inspection (see Chapter 10)
19 Condition test
Test duration
Figure 1 Test curve of non-heat dissipation test sample
11 Recovery
12 Final test
Test room temperature
5 Select monitoring points and determine monitoring temperature
Test (environment)》
Power on test sample7777777
Appearance inspection and
Performance inspection
Surface temperature of test sample
Test chamber ambient temperature
Intermediate inspection (see Chapter 10)
8 Initial
GB 2423.35--86
9 Condition test
77777Z7
Test duration
Figure 2 Test curve of heat dissipation test sample
The vibration environment can be one or more of the following: a.
Endurance sweep frequency test.
Dynamic response check, and endurance test at the frequencies generated by the vibration response check. b.
Endurance test at predetermined frequencies.
4 Test equipment
4.1 Requirements for test chamber
4.1.1 Test of non-heat dissipation test samples
This type of test chamber shall meet the requirements given in Test Aa or Ab (see Note in Chapter 3). 4.1.2 Test of heat dissipation test samples
[11 recovery 112 final detection
The selection of temperature monitoring points and the determination of monitoring temperatures may be carried out in accordance with a or b below. a. Under low 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 Aij Test Ad.
b. Test chamber ( or room) to protect the test specimen from solar radiation and ventilation interference (see 6.1.2). The test chamber used for this test should usually have strong air circulation. The requirements given in Chapter 28 of Test Ad and Chapter 18 of Test Ab should be met (Note 3).
4.2 Requirements for vibration system
4.2.1 Installation
The installation requirements given in Test Fc should be met. If the test specimen is heat-dissipating, the temperature of the moving table surface is different from the test environment temperature, so the installation between the test specimen and the vibration table should have low thermal conductivity. Conductive, preferably thermally insulated. Note: When adding thermal insulation, care should be taken that the dynamic characteristics of the test sample and the test sample installation do not change significantly within the test frequency range used.
4.2.2 Vibration system
GB2423.35-86
The vibration system shall meet the requirements given in Test Fc. 5 Severity level
The severity level of the moving 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 A. The durability test shall begin when the test sample reaches temperature stability. 6 Selection of temperature monitoring points and determination of monitoring temperature (only for heat dissipation test samples) 6.1 Test samples without overhead cooling
6.1.1 Use a test chamber that can simulate the effects of "free air conditions" under low 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 Then, the ambient temperature of the test chamber is adjusted to the corresponding test severity level, and the test sample is 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: ①) 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 T working state that causes the highest temperature.
② It is expensive to determine the temperature monitoring point. If a large test sample with a complex structure is determined, the cost will be even more expensive. 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 low 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 4.1.2 and powered on. 6.1.2.2 Ensure that the test specimen reaches temperature stability. Then determine the hottest point of the 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 GB2423.1-81. 6.2 Artificially cooled test specimens
6.2.1 General protective measures, this language, see the corresponding clause of test Ad. 6.2.2 Cooling system is separated from the test chamber
The temperature monitoring point and the 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 the monitoring temperature shall be determined in accordance with 6.2.2, except that the air inlet point from the test chamber into the test sample shall be the temperature monitoring point, and the temperature monitored 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 the test sample shall be moved in one or several axes. When it is specified to move in several axes during the entire conditioning test, the entire test procedure shall be repeated in each specified axis. If the test specimen has a cooling system, it shall be used when the test specimen is powered at any stage during the conditioning test.
If Tests A and Fc are not performed 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 has been achieved, the test specimen is subjected to the specified level of motion. When required by the relevant standard, the test specimen is subjected to performance testing. When an endurance swept frequency test is specified, a sweep cycle shall be made within the specified frequency range. When an endurance test at the frequencies obtained by the perturbation response check is specified, a sweep cycle shall be made during the motion response check over the specified frequency range, the amplitude of which shall be specified for the endurance test at the frequencies obtained by the vibration response check. NOTE: To simplify the vibration response check at low temperatures, the perturbation response associated with the swept frequency test may be studied at laboratory temperature. When the endurance test is carried out at the predetermined frequency, the test is to be observed at each specified frequency of the specified amplitude, but the duration is shorter than the specified test duration.
9.2 Low temperature test without vibration
9.2.1 Test of non-heat dissipation test sample
The temperature of the test chamber shall be adjusted 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 energized, 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 may be carried out after reaching temperature stability. Note: If the test sample has multiple working modes that can cause different surface temperatures, the functional test shall be carried out under the working state that causes the highest temperature at the monitoring point.
9.3 Temperature/dynamic comprehensive test
9.3.1 After the test sample reaches temperature stability according to 9.2, dynamic testing is carried out according to the specified level and duration. The relevant standards shall specify whether the test sample is energized or working during this test. 9.3.2 The relevant standard shall specify which test procedure of test Fc shall 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. c. Endurance test at a predetermined frequency
Note: If the relevant standard requires the test sample to be operated in different modes of operation, 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 Then stop the operation. If the test sample was powered on during the conditioning test, the power supply shall be disconnected at this time. The test sample shall remain in the test chamber and the temperature shall be raised to the 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 A.
11 Recovery
See test A.
12 Final test
Inspect the test sample and test its electrical and mechanical properties as required by the relevant standards. 347
13 Failure criteria
The failure criteria shall be specified by the relevant standards.
14 Contents that the relevant standards should have
GB 2423.3586
When the relevant standards adopt this test, the following details required by test A and test Fc must be given: a.
Temperature change rate: sudden change (test Aa) or gradual change (test Ab or Ad) see 4.2.1.
Details of mounting and support
Severity level: temperature, amplitude, test duration and frequency range or predetermined frequencyPreconditioning
Initial test
See Clause 7.
See Clause 8.
Axial direction of motion
See Clause 9.
Condition of test specimen during conditioning test
Performance test
See 9.1; 9.3.1.
See 9, 9.1# 9.3.1.
See Clause 3.
See Clause 5.
Vibration test procedure (endurance swept frequency test, endurance test at response frequency, endurance test at predetermined frequency) See 9.3.2
See options permitted in 9.3.2b.
Non-standard recovery
See Clause 11.
Testing and loading during conditional test
Final test
Failure criteria
Additional instructions:
See Chapter 12.
See Chapter 13.
See Chapter 10.
This standard is proposed by the National Technical Committee for Environmental Conditions and Environmental Testing of Electrical and Electronic Products. This standard was drafted by the Temperature/Vibration (Sinusoidal) Comprehensive Test Working Group of the "Environmental Standardization Committee". 34835--86
When the test specimen is subjected to displacement in several axes, the entire test procedure shall be repeated in each specified axis. If the test specimen has a cooling system, it shall be used at the same time when the test specimen is energized at any stage during the conditioning test.
If Tests A and Fc are not performed 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, energized. After temperature stabilization has been achieved, the test specimen is subjected to the specified level of displacement. When required by the relevant standard, the test specimen is subjected to performance testing. When an endurance swept frequency test is specified, a swept frequency cycle shall be performed within the specified frequency range. When an endurance test at the frequencies obtained by the perturbation response check is specified, a swept frequency cycle shall be performed within the specified frequency range during the displacement response check, the amplitude of which shall be specified by the endurance test at the frequencies obtained by the vibration response check. NOTE: To simplify the vibration response check at low temperatures, the perturbation response associated with the swept frequency test may be studied at laboratory temperature. When the endurance test is carried out at the predetermined frequency, the test is to be observed at each specified frequency of the specified amplitude, but the duration is shorter than the specified test duration.
9.2 Low temperature test without vibration
9.2.1 Test of non-heat dissipation test sample
The temperature of the test chamber shall be adjusted 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 energized, 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 may be carried out after reaching temperature stability. Note: If the test sample has multiple working modes that can cause different surface temperatures, the functional test shall be carried out under the working state that causes the highest temperature at the monitoring point.
9.3 Temperature/dynamic comprehensive test
9.3.1 After the test sample reaches temperature stability according to 9.2, dynamic testing is carried out according to the specified level and duration. The relevant standards shall specify whether the test sample is energized or working during this test. 9.3.2 The relevant standard shall specify which test procedure of test Fc shall 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. c. Endurance test at a predetermined frequency
Note: If the relevant standard requires the test sample to be operated in different modes of operation, 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 Then stop the operation. If the test sample was powered on during the conditioning test, the power supply shall be disconnected at this time. The test sample shall remain in the test chamber and the temperature shall be raised to the 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 A.
11 Recovery
See test A.
12 Final test
Inspect the test sample and test its electrical and mechanical properties as required by the relevant standards. 347
13 Failure criteria
The failure criteria shall be specified by the relevant standards.
14 Contents that the relevant standards should have
GB 2423.3586
When the relevant standards adopt this test, the following details required by test A and test Fc must be given: a.
Temperature change rate: sudden change (test Aa) or gradual change (test Ab or Ad) see 4.2.1.
Details of mounting and support
Severity level: temperature, amplitude, test duration and frequency range or predetermined frequencyPreconditioning
Initial test
See Clause 7.
See Clause 8.
Axial direction of motion
See Clause 9.
Condition of test specimen during conditioning test
Performance test
See 9.1; 9.3.1.
See 9, 9.1# 9.3.1.
See Clause 3.
See Clause 5.
Vibration test procedure (endurance swept frequency test, endurance test at response frequency, endurance test at predetermined frequency) See 9.3.2
See options permitted in 9.3.2b.
Non-standard recovery
See Clause 11.
Testing and Loading during Conditioning Test
Final Test
Failure Criteria
Additional Notes:
See Chapter 12.
See Chapter 13.
See Chapter 10.
This standard is proposed by the National Technical Committee for Environmental Conditions and Environmental Testing of Electrical and Electronic Products. This standard is drafted by the Temperature/Vibration (Sinusoidal) Comprehensive Test Working Group of the "Environmental Standardization Committee". 34835--86
When the test specimen is subjected to displacement in several axes, the entire test procedure shall be repeated in each specified axis. If the test specimen has a cooling system, it shall be used at the same time when the test specimen is energized at any stage during the conditioning test.
If Tests A and Fc are not performed 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, energized. After temperature stabilization has been achieved, the test specimen is subjected to the specified level of displacement. When required by the relevant standard, the test specimen is subjected to performance testing. When an endurance swept frequency test is specified, a swept frequency cycle shall be performed within the specified frequency range. When an endurance test at the frequencies obtained by the perturbation response check is specified, a swept frequency cycle shall be performed within the specified frequency range during the displacement response check, the amplitude of which shall be specified by the endurance test at the frequencies obtained by the vibration response check. NOTE: To simplify the vibration response check at low temperatures, the perturbation response associated with the swept frequency test may be studied at laboratory temperature. When the endurance test is carried out at the predetermined frequency, the test is to be observed at each specified frequency of the specified amplitude, but the duration is shorter than the specified test duration.
9.2 Low temperature test without vibration
9.2.1 Test of non-heat dissipation test sample
The temperature of the test chamber shall be adjusted 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 energized, 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 may be carried out after reaching temperature stability. Note: If the test sample has multiple working modes that can cause different surface temperatures, the functional test shall be carried out under the working state that causes the highest temperature at the monitoring point.
9.3 Temperature/dynamic comprehensive test
9.3.1 After the test sample reaches temperature stability according to 9.2, dynamic testing is carried out according to the specified level and duration. The relevant standards shall specify whether the test sample is energized or working during this test. 9.3.2 The relevant standard shall specify which test procedure of test Fc shall 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. c. Endurance test at a predetermined frequency
Note: If the relevant standard requires the test sample to be operated in different modes of operation, 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 Then stop the operation. If the test sample was powered on during the conditioning test, the power supply shall be disconnected at this time. The test sample shall remain in the test chamber and the temperature shall be raised to the 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 A.
11 Recovery
See test A.
12 Final test
Inspect the test sample and test its electrical and mechanical properties as required by the relevant standards. 347
13 Failure criteria
The failure criteria shall be specified by the relevant standards.
14 Contents that the relevant standards should have
GB 2423.3586
When the relevant standards adopt this test, the following details required by test A and test Fc must be given: a.
Temperature change rate: sudden change (test Aa) or gradual change (test Ab or Ad) see 4.2.1.
Details of mounting and support
Severity level: temperature, amplitude, test duration and frequency range or predetermined frequencyPreconditioning
Initial test
See Clause 7.
See Clause 8.
Axial direction of motion
See Clause 9.
Condition of test specimen during conditioning test
Performance test
See 9.1; 9.3.1.
See 9, 9.1# 9.3.1.
See Clause 3.
See Clause 5.
Vibration test procedure (endurance swept frequency test, endurance test at response frequency, endurance test at predetermined frequency) See 9.3.2
See options permitted in 9.3.2b.
Non-standard recovery
See Clause 11.
Testing and loading during conditional test
Final test
Failure criteria
Additional instructions:
See Chapter 12.
See Chapter 13.
See Chapter 10.
This standard is proposed by the National Technical Committee for Environmental Conditions and Environmental Testing of Electrical and Electronic Products. This standard was drafted by the Temperature/Vibration (Sinusoidal) Comprehensive Test Working Group of the "Environmental Standardization Committee". 3481.
Details of mounting and support
Severity level: temperature, amplitude, test duration and frequency range or predetermined frequencyPreconditioning
Initial test
See Clause 7.
See Clause 8.
Axial direction of movement
See Clause 9.
Condition of test specimen during conditioning test
Performance test
See 9.1; 9.3.1.
See 9, 9.1# 9.3.1.
See Clause 3.
See Clause 5.
Vibration test procedure (endurance swept frequency test, endurance test at response frequency, endurance test at predetermined frequency) See 9.3.2
See 9.3.2b for alternatives permitted.
Non-standard recoverywww.bzxz.net
See Chapter 11.
Testing and loading during conditional test
Final test
Failure criteria
Additional instructions:
See Chapter 12.
See Chapter 13.
See Chapter 10.
This standard is proposed by the National Technical Committee for Environmental Conditions and Environmental Testing of Electrical and Electronic Products. This standard was drafted by the Temperature/Vibration (Sinusoidal) Comprehensive Test Working Group of the "Environmental Standardization Committee". 3481.
Details of mounting and support
Severity level: temperature, amplitude, test duration and frequency range or predetermined frequencyPreconditioning
Initial test
See Clause 7.
See Clause 8.
Axial direction of movement
See Clause 9.
Condition of test specimen during conditioning test
Performance test
See 9.1; 9.3.1.
See 9, 9.1# 9.3.1.
See Clause 3.
See Clause 5.
Vibration test procedure (endurance swept frequency test, endurance test at response frequency, endurance test at predetermined frequency) See 9.3.2
See 9.3.2b for alternatives permitted.
Non-standard recovery
See Chapter 11.
Testing and loading during conditional test
Final test
Failure criteria
Additional instructions:
See Chapter 12.
See Chapter 13.
See Chapter 10.
This standard is proposed by the National Technical Committee for Environmental Conditions and Environmental Testing of Electrical and Electronic Products. This standard was drafted by the Temperature/Vibration (Sinusoidal) Comprehensive Test Working Group of the "Environmental Standardization Committee". 348
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