GB/T 2423.37-1989 Environmental testing procedures for electrical and electronic products Test L: Sand and dust test method
Some standard content:
National Standard of the People's Republic of China
Basic environmental testing procedures for electric and electronic products Test L: Dust and Sand
1 Subject content and scope of application
This standard specifies the basic environmental testing procedures for electric and electronic products Test L: Dust and Sand. GB 2423.37 --89
This standard provides three sand and dust test methods, which are applicable to electric and electronic products used in sand and dust environments. The main effects of sand and dust on products are as follows:
Invasion of seals and housings;
Change of electrical properties (such as contact resistance and surface leakage current changes, etc.), blocking and wearing of moving parts such as bearings;
Abrasion of surfaces, contamination of lubricants;
Blocking of vents, pipes, filters, operating holes, etc.; Dust accumulation can become the core of water vapor condensation, promoting corrosion and mold growth. 2 Method La: Dustproof of outer shell
Test method for testing the sealing performance of the outer shell of the product, mainly used for products of IP5X and IP6X levels specified in GB4208-84 "Classification of outer shell protection levels". 2.1 Requirements for the test chamber (room)
It should be able to provide non-laminar vertical circulation airflow carrying dust during the test; it should have the function of recycling dust during the test; it should have good sealing during the test;
It should be able to observe the circulation of dust during the test: the inner wall should be smooth and anti-static:;
It should be equipped with a vacuum pump and meet the requirements of Article 2.2.5 of this standard. 2.2 Test conditions
2.2.1 Test dust
Dry talcum powder that can pass through a square hole sieve with a mesh size of 75gum and a wire diameter of 50um. 2.2.2 Dust concentration
The dust volume in the test chamber (room) (working room and pipe channel) is 2kg/m. 2.2.3 Air velocity
Should be able to ensure that the test dust settles evenly and slowly on the test sample, but the maximum value shall not exceed 2m/s. 2.2.4 Temperature and relative humidity
Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on February 28, 1989 and implemented on January 1, 1990
GB 2423.37-89
During the test, the temperature in the test box (room): 15~~35℃; relative humidity: 45%~～75%. 2.2.5 Pressure inside the shell of the test sample
Class A shell--When the equipment is working normally, the air pressure inside the shell is lower than the surrounding atmospheric pressure. Class B shell--The pressure inside the shell is equal to the surrounding atmospheric pressure. For Class A shell, connect the vacuum pump to the test sample during the test to keep the pressure inside the shell lower than the atmospheric pressure, and the pressure difference value does not exceed 1.98kPa. When the test sample has no holes, whether to open a connection hole is determined by the relevant product standards; when there are multiple holes, except for the hole connected to the vacuum pump, the remaining holes should be closed during the test.
For Class B enclosures, the test sample is placed in the test box (chamber) in the normal working position during the test, and is not connected to the vacuum pump. The holes that are open under normal circumstances must remain open during the test. 2.2.6 Duration
The duration of the test, for Class A enclosures, is 2 hours when the exhaust speed is 40 to 60 times the shell volume per hour, and when the exhaust speed is less than 40 times the shell volume per hour, it should be continuously exhausted. If the exhaust volume is less than 80 times, it should be exhausted until 8 hours.
For Class B enclosures, the duration is 8 hours.
2.3 Test Procedure
2.3.1 Pretreatment
Before the test equipment is turned on, the test sample should generally be placed under normal test atmospheric conditions for no less than 2 hours. 2.3.2 Initial test
According to the requirements of relevant standards, the test samples can be self-tested and tested for electrical and mechanical properties. 2.3.3 Conditional test
2.3.3.1 The test samples should generally be placed in the test box (chamber) in an unpackaged, unpowered and "ready to use" state. The total volume shall not exceed 1/3 of the effective space of the test box (chamber), the bottom area shall not exceed 1/2 of the effective horizontal area, and the distance between the test samples and the inner wall of the test box (chamber) shall not be less than 100mm.
If the test sample cannot be placed in the test box (chamber) as a whole, one of the following methods can be used: a. Test each enclosed part separately
b. Test components including doors, vents, joints, shaft seals, etc. During the test, the parts of each component that are easily affected by dust (contact terminals, collector rings, etc.) should be installed in place;
c. Test smaller products with the same structure as the test sample. For treatment methods b and c, the volume of gas extracted is equal to the volume of gas extracted from the original test sample. 2.3.3.2 For Class A enclosures, connect a vacuum pump to it, then blow the dust and evacuate the air at the same time. 2.3.3.3 According to the requirements of relevant standards, the test sample can be subjected to load during the test. 2.3.3.4 After stopping the blowing, wait until the dust is completely settled before taking out the test sample. 2.3.4 Intermediate testing
According to the requirements of relevant standards, the test sample can be tested during the test. The test sample shall not be taken out during the test. 2.3.5 Recovery
After the test sample is taken out, it should generally be placed under normal test atmospheric conditions for 1 to 2 hours. 2.3.6 Final testing
According to the requirements of relevant standards, the test sample can be visually inspected and the electrical and mechanical properties tested. 2.4 When this standard is used, specific provisions shall be made for the following items: Enclosure type and duration (see 2.2.5 and 2.2.6); a.
Pretreatment (see 2.3.1);
Initial test (see 2.3.2);
Conditioning test (see 2.3.3);
Intermediate test (see 2.3.4);
Recovery (see 2.3.5);
Final test (see 2.3.6).
Method Lb: Free dust fall
GB 2423. 37 -. 89
Test method for testing the ability of products to work in an environment where dust is free to settle and there is no obvious air flow. 3.1 Requirements for the test box (room)
It should be able to expose the test sample to the dust-filled air, so that the dust can settle freely on the test sample; it should have the ability to blow in dust intermittently; the test dust should be blown in at 1/5 of the height of the working room near the top of the test box (room); it should have good sealing performance;
The inner wall should be smooth and anti-static;
The effective space should be no less than 8m, and the ratio of height to side length should be at least 2:5:1. 3.2 Test conditions
3.2.1 Types of test dust
Class A dust: by mass, it is composed of 97% inorganic minerals and 3% cotton fibers. The minerals should contain 65% to 75% SiO2, and the rest are natural impurities. By mass, the particle size distribution is:
Below 5μm: ≥39%;
5~10μm: <18%;
10~20μm; <16%;
20~40μm: <18%;
40~80μm: <9%
Cotton fiber should contain a small amount of fine impurities from cotton boll shells. The length after grinding is generally not more than 10mm. Class B dust: By mass, it is composed of 100% inorganic minerals. By mass, the minerals should contain:
Si02: 34% ~ 40%:
Fe203: 17% ~23%;
Al203: 26% ~~ 32%.
The rest are natural impurities.
By mass, the particle size distribution is;
Below 10μm: about 68%;
10~20μm: about 12%;
20~~50μm: about 14%;
50~100μm: about 6%.
3.2.2Dust concentration
In 24h, it is 6±1g/m.
3.2-3Blowing time and air flow speed
During the test, starting from the first blowing of dust, the dust is blown once every 59min, and the time is 1min. The air flow speed at the entrance is about 2m/s. 3.2.4Temperature and relative humidity
During the test, the temperature in the test box (room): 15~35℃; relative humidity: 45%~75%. 3.2-5 Duration
Unless otherwise specified, it shall be 1, 4, or 10 days. 3.3 Test Procedure
3.3.1 Pretreatment
GB 2423-37--89bzxz.net
Before starting the test box (room), the test samples should be placed under normal test atmospheric conditions for no less than 2 hours. 3.3.2 Initial test
According to the requirements of relevant standards, the test samples can be visually inspected and tested for electrical and mechanical properties. 3.3.3 Condition test
3.3.3.1 The test samples should generally be placed in the test box (room) in an unpackaged, unpowered and "ready to use" state. The total bottom area should not exceed 1/2 of the effective horizontal area, and the distance between the test samples and the inner wall of the test box (room) should not be less than 100mm. 3.3.3.2 According to the requirements of relevant standards, the test samples can be loaded during the test. 3.3.3.3 After stopping the blowing, the test samples can be taken out only after the dust has completely settled. 3.3.4 Intermediate testing
According to the requirements of relevant standards, the test samples can be tested during the test. During the test, the test samples shall not be taken out of the test box (chamber).
3.3.5 Recovery
After the test samples are taken out, they should generally be placed under normal test atmospheric conditions for 1 to 2 hours. Note: After the test samples are recovered, they can be subjected to additional Ca tests (GB2423.3-81, constant humidity test method) according to the requirements of relevant standards to take into account the moisture absorption of dust. Under the conditions of the Ca test, dust may stick together. When moving the test samples, try not to knock off the dust on them. 3.3.6 Final testing
According to the requirements of relevant standards, the test samples can be visually inspected and tested for electrical and mechanical properties. 3.4 The following items shall be specified when this standard is cited: &. Type and duration of dust (see Articles 3.2.4 and 3.2.5); b. Pretreatment (see Section 3.3.1);
Initial test (see Section 3.3.2);
Conditioning test (see Section 3.3.3);
Intermediate test (see Section 3.3.4);
Recovery (see Section 3.3.5);
Additional Ca test (see Section 3.3.5); g.
Final test (see Section 3.3.6).
4 Method Lc: Blowing sand and dust
Test method for testing the working ability of products placed outdoors in places with strong airflow and a lot of sand and dust and similar places. 4.1 Requirements for the test chamber
It should be able to provide a circulating airflow that is approximately laminar; it should have a device to monitor and control the sand and dust concentration; the fan for the circulating airflow should not be impacted by sand and dust; it should have good sealing performance;
The plane of the test sample mounting plate is parallel to the airflow direction, and the rotation speed is about 2r/min; it should be equipped with a vacuum pump and meet the requirements of Article 4.2.1.5. f.
4.2 Test conditions
This method includes two test conditions:
4.2.1 Test condition 1
4.2.1.1 Test dust
By mass, it consists of 50% unburned silicate cement and 50% flue ash. After mixing, the particle size distribution by mass is: 358
Below 32μm: about 33%;
32~250μm: about 67%.
GB 2423. 37--89
Note: ① Flue ash can be obtained from the flue gas filter of the thermal power station. ② The impurity content in the mixed dust shall not exceed 5% (by mass). 4.2.1.2 Dust concentration
The dust content in the test box (room) (working room and pipeline) is 5±2g/m. 4.2.1.3 Air flow velocity
1.5~3m/s.
4.2.1.4 Temperature and relative humidity
During the test, the temperature in the test box (room): 15~～35C; relative humidity: 45%~～75%. 4.2-1.5 Shell pressure of the test sample
See Section 2.2.5.
4.2.1.6 Duration
Unless otherwise specified, it should be 2, 4, 8, 24h. 4.2.2 Test conditions II
4.2.2.1 Test dust
By mass, it is composed of 70% SiO, quartz with a content of more than 90%, 15% limestone, and 15% kaolin. After mixing, the particle size distribution by mass is: <250μm: 100%;
<200μm: 93%.
4.2.2.2 Dust concentration
In the test box (room) (working room and passage), the amount of sand and dust is 150±15g/m. 4.2.2.3 Air flow velocity
12.5±2.5m/s
4.2.2:4 Temperature and relative humidity
During the test, the temperature in the test box (room): 15~~35℃; relative humidity: 45%~~75%. It can also be high temperature and low humidity conditions according to requirements. 4.2.2.5 Duration
Unless otherwise specified, it should be 0.5, 1, 2h. 4.3 Test Procedure
4.3.1 Pretreatment
Before starting up, the test sample should generally be placed under normal test atmospheric conditions for no less than 2h. 4.3.2 Initial Inspection
According to the requirements of relevant standards, the test sample can be subjected to visual inspection and electrical and mechanical performance inspection. 4.3.3 Conditional Test
4.3.3.1 The test sample should generally be placed in the test box (chamber) in an unpackaged, unpowered, and "ready to use" state. The total volume shall not exceed 1/3 of the effective volume of the test box (chamber), the sum of the cross-sectional areas of the test samples perpendicular to the wind direction shall not exceed 1/2 of this effective cross-sectional area, and the distance between the test samples and the inner wall of the test box (chamber) shall not be less than 100mm. 4.3.3.2 For the Class A enclosure of test condition I, connect the vacuum pump to it, then blow the dust and exhaust the air. 4.3.3.3 According to the requirements of relevant standards, the test sample can withstand the load during the test. 4.3.3.4 After the blowing stops, the test sample can be taken out only after the sand and dust are completely settled. 4.3.4 Intermediate inspection
According to the requirements of relevant standards, the test sample can be inspected during the test. The test sample shall not be taken out during the inspection. 359
4.3.5 Recovery
GB2423.37
After the test sample is taken out, it should generally be placed under normal test atmospheric conditions for 1 to 2 hours. 4.3.6 Final inspection
According to the requirements of relevant standards, the test sample shall be visually inspected and tested for mechanical and electrical properties. 4.4 When citing this standard, specific provisions shall be made for the following items: a.
Test conditions and shell types (see Article 4.2); pretreatment (see Article 4.3.1),
initial test (see Article 4.3.2);
conditioning test (see Article 4.3.3);
intermediate test (see Article 4.3.4);
recovery (see Article 4.3.5);
final test (see Article 4.3.6).
Additional notes:
This standard was proposed and coordinated by the National Technical Committee for Environmental Conditions and Environmental Testing of Electrical and Electronic Products. This standard was drafted by Guangzhou Electric Science Research Institute and other units. The main drafters of this standard are Shao Bei, Ye Siqin, Huang Yuzhou, Zhang Jingen, Zhu Yuechang, and Liu Jingxiu. 3604 Reference to this standard shall specify the following items: a. Dust type and duration (see Sections 3.2.4 and 3.2.5); b. Pretreatment (see Section 3.3.1);
Initial test (see Section 3.3.2);
Conditioning test (see Section 3.3.3);
Intermediate test (see Section 3.3.4);
Recovery (see Section 3.3.5);
Additional Ca test (see Section 3.3.5); g.
Final test (see Section 3.3.6).
4 Method Lc: Blowing sand and dust
Test method for testing the working ability of products placed outdoors in places with strong airflow and a large amount of sand and dust and similar places. 4.1 Requirements for the test chamber
It should be able to provide a circulating airflow that is approximately laminar; it should have a device to monitor and control the sand and dust concentration; the fan for the circulating airflow should not be impacted by sand and dust; it should have good sealing performance;
The plane of the test sample mounting plate is parallel to the airflow direction, and the rotation speed is about 2r/min; it should be equipped with a vacuum pump and meet the requirements of Article 4.2.1.5. f.
4.2 Test conditions
This method includes two test conditions:
4.2.1 Test condition 1
4.2.1.1 Test dust
By mass, it consists of 50% unburned silicate cement and 50% flue ash. After mixing, the particle size distribution by mass is: 358
Below 32μm: about 33%;
32~250μm: about 67%.
GB 2423. 37--89
Note: ① Flue ash can be obtained from the flue gas filter of the thermal power station. ② The impurity content in the mixed dust shall not exceed 5% (by mass). 4.2.1.2 Dust concentration
The dust content in the test box (room) (working room and pipeline) is 5±2g/m. 4.2.1.3 Air flow velocity
1.5~3m/s.
4.2.1.4 Temperature and relative humidity
During the test, the temperature in the test box (room): 15~～35C; relative humidity: 45%~～75%. 4.2-1.5 Shell pressure of the test sample
See Section 2.2.5.
4.2.1.6 Duration
Unless otherwise specified, it should be 2, 4, 8, 24h. 4.2.2 Test conditions II
4.2.2.1 Test dust
By mass, it is composed of 70% SiO, quartz with a content of more than 90%, 15% limestone, and 15% kaolin. After mixing, the particle size distribution by mass is: <250μm: 100%;
<200μm: 93%.
4.2.2.2 Dust concentration
In the test box (room) (working room and passage), the amount of sand and dust is 150±15g/m. 4.2.2.3 Air flow velocity
12.5±2.5m/s
4.2.2:4 Temperature and relative humidity
During the test, the temperature in the test box (room): 15~~35℃; relative humidity: 45%~~75%. It can also be high temperature and low humidity conditions according to requirements. 4.2.2.5 Duration
Unless otherwise specified, it should be 0.5, 1, 2h. 4.3 Test Procedure
4.3.1 Pretreatment
Before starting up, the test sample should generally be placed under normal test atmospheric conditions for no less than 2h. 4.3.2 Initial Inspection
According to the requirements of relevant standards, the test sample can be subjected to visual inspection and electrical and mechanical performance inspection. 4.3.3 Conditional Test
4.3.3.1 The test sample should generally be placed in the test box (chamber) in an unpackaged, unpowered, and "ready to use" state. The total volume shall not exceed 1/3 of the effective volume of the test box (chamber), the sum of the cross-sectional areas of the test samples perpendicular to the wind direction shall not exceed 1/2 of this effective cross-sectional area, and the distance between the test samples and the inner wall of the test box (chamber) shall not be less than 100mm. 4.3.3.2 For the Class A enclosure of test condition I, connect the vacuum pump to it, then blow the dust and exhaust the air. 4.3.3.3 According to the requirements of relevant standards, the test sample can withstand the load during the test. 4.3.3.4 After the blowing stops, the test sample can be taken out only after the sand and dust are completely settled. 4.3.4 Intermediate inspection
According to the requirements of relevant standards, the test sample can be inspected during the test. The test sample shall not be taken out during the inspection. 359
4.3.5 Recovery
GB2423.37
After the test sample is taken out, it should generally be placed under normal test atmospheric conditions for 1 to 2 hours. 4.3.6 Final inspection
According to the requirements of relevant standards, the test sample shall be visually inspected and tested for mechanical and electrical properties. 4.4 When citing this standard, specific provisions shall be made for the following items: a.
Test conditions and shell types (see Article 4.2); pretreatment (see Article 4.3.1),
initial test (see Article 4.3.2);
conditioning test (see Article 4.3.3);
intermediate test (see Article 4.3.4);
recovery (see Article 4.3.5);
final test (see Article 4.3.6).
Additional notes:
This standard was proposed and coordinated by the National Technical Committee for Environmental Conditions and Environmental Testing of Electrical and Electronic Products. This standard was drafted by Guangzhou Electric Science Research Institute and other units. The main drafters of this standard are Shao Bei, Ye Siqin, Huang Yuzhou, Zhang Jingen, Zhu Yuechang, and Liu Jingxiu. 3604 Reference to this standard shall specify the following items: a. Dust type and duration (see Sections 3.2.4 and 3.2.5); b. Pretreatment (see Section 3.3.1);
Initial test (see Section 3.3.2);
Conditioning test (see Section 3.3.3);
Intermediate test (see Section 3.3.4);
Recovery (see Section 3.3.5);
Additional Ca test (see Section 3.3.5); g.
Final test (see Section 3.3.6).
4 Method Lc: Blowing sand and dust
Test method for testing the working ability of products placed outdoors in places with strong airflow and a large amount of sand and dust and similar places. 4.1 Requirements for the test chamber
It should be able to provide a circulating airflow that is approximately laminar; it should have a device to monitor and control the sand and dust concentration; the fan for the circulating airflow should not be impacted by sand and dust; it should have good sealing performance;
The plane of the test sample mounting plate is parallel to the airflow direction, and the rotation speed is about 2r/min; it should be equipped with a vacuum pump and meet the requirements of Article 4.2.1.5. f.
4.2 Test conditions
This method includes two test conditions:
4.2.1 Test condition 1
4.2.1.1 Test dust
By mass, it consists of 50% unburned silicate cement and 50% flue ash. After mixing, the particle size distribution by mass is: 358
Below 32μm: about 33%;
32~250μm: about 67%.
GB 2423. 37--89
Note: ① Flue ash can be obtained from the flue gas filter of the thermal power station. ② The impurity content in the mixed dust shall not exceed 5% (by mass). 4.2.1.2 Dust concentration
The dust content in the test box (room) (working room and pipeline) is 5±2g/m. 4.2.1.3 Air flow velocity
1.5~3m/s.
4.2.1.4 Temperature and relative humidity
During the test, the temperature in the test box (room): 15~～35C; relative humidity: 45%~～75%. 4.2-1.5 Shell pressure of the test sample
See Section 2.2.5.
4.2.1.6 Duration
Unless otherwise specified, it should be 2, 4, 8, 24h. 4.2.2 Test conditions II
4.2.2.1 Test dust
By mass, it is composed of 70% SiO, quartz with a content of more than 90%, 15% limestone, and 15% kaolin. After mixing, the particle size distribution by mass is: <250μm: 100%;
<200μm: 93%.
4.2.2.2 Dust concentration
In the test box (room) (working room and passage), the amount of sand and dust is 150±15g/m. 4.2.2.3 Air flow velocity
12.5±2.5m/s
4.2.2:4 Temperature and relative humidity
During the test, the temperature in the test box (room): 15~~35℃; relative humidity: 45%~~75%. It can also be high temperature and low humidity conditions according to requirements. 4.2.2.5 Duration
Unless otherwise specified, it should be 0.5, 1, 2h. 4.3 Test Procedure
4.3.1 Pretreatment
Before starting up, the test sample should generally be placed under normal test atmospheric conditions for no less than 2h. 4.3.2 Initial Inspection
According to the requirements of relevant standards, the test sample can be subjected to visual inspection and electrical and mechanical performance inspection. 4.3.3 Conditional Test
4.3.3.1 The test sample should generally be placed in the test box (chamber) in an unpackaged, unpowered, and "ready to use" state. The total volume shall not exceed 1/3 of the effective volume of the test box (chamber), the sum of the cross-sectional areas of the test samples perpendicular to the wind direction shall not exceed 1/2 of this effective cross-sectional area, and the distance between the test samples and the inner wall of the test box (chamber) shall not be less than 100mm. 4.3.3.2 For the Class A enclosure of test condition I, connect the vacuum pump to it, then blow the dust and exhaust the air. 4.3.3.3 According to the requirements of relevant standards, the test sample can withstand the load during the test. 4.3.3.4 After the blowing stops, the test sample can be taken out only after the sand and dust are completely settled. 4.3.4 Intermediate inspection
According to the requirements of relevant standards, the test sample can be inspected during the test. The test sample shall not be taken out during the inspection. 359
4.3.5 Recovery
GB2423.37
After the test sample is taken out, it should generally be placed under normal test atmospheric conditions for 1 to 2 hours. 4.3.6 Final inspection
According to the requirements of relevant standards, the test sample shall be visually inspected and tested for mechanical and electrical properties. 4.4 When citing this standard, specific provisions shall be made for the following items: a.
Test conditions and shell types (see Article 4.2); pretreatment (see Article 4.3.1),
initial test (see Article 4.3.2);
conditioning test (see Article 4.3.3);
intermediate test (see Article 4.3.4);
recovery (see Article 4.3.5);
final test (see Article 4.3.6).
Additional notes:
This standard was proposed and coordinated by the National Technical Committee for Environmental Conditions and Environmental Testing of Electrical and Electronic Products. This standard was drafted by Guangzhou Electric Science Research Institute and other units. The main drafters of this standard are Shao Bei, Ye Siqin, Huang Yuzhou, Zhang Jingen, Zhu Yuechang, and Liu Jingxiu. 3604 Temperature and relative humidity
During the test, the temperature in the test box (room): 15~~35℃; relative humidity: 45%~~75%. It can also be high temperature and low humidity conditions as required. 4.2.2.5 Duration
Unless otherwise specified, it should be 0.5, 1, 2h. 4.3 Test procedure
4.3.1 Pretreatment
Before starting up, the test samples should generally be placed in normal test atmospheric conditions for no less than 2h. 4.3.2 Initial inspection
According to the requirements of relevant standards, the test samples can be visually inspected and the electrical and mechanical properties tested. 4.3.3 Conditional test
4.3.3.1 The test samples should generally be placed in the test box (room) in an unpackaged, unpowered, and "ready to use" state. The total volume shall not exceed 1/3 of the effective volume of the test box (room), the sum of the cross-sectional areas of the test samples perpendicular to the wind direction shall not exceed 1/2 of this effective cross-sectional area, and the distance between the test samples and the inner wall of the test box (room) shall not be less than 100mm. 4.3.3.2 For the Class A enclosure of test condition I, connect the vacuum pump to it, and then blow the dust and exhaust the air. 4.3.3.3 According to the requirements of relevant standards, the test samples can withstand the load during the test. 4.3.3.4 After stopping the blowing, wait until the sand and dust are completely settled before taking out the test samples. 4.3.4 Intermediate testing
According to the requirements of relevant standards, the test samples can be tested during the test. During the test, the test samples shall not be taken out. 359
4.3.5 Recovery
GB2423.37
After the test samples are taken out, they should generally be placed under normal test atmospheric conditions for 1 to 2 hours. 4.3.6 Final test
According to the requirements of relevant standards, visual inspection and mechanical and electrical performance tests shall be carried out on the test samples. 4.4 When citing this standard, specific provisions shall be made for the following items: a.
Test conditions and shell types (see Article 4.2); pretreatment (see Article 4.3.1),
initial test (see Article 4.3.2);
conditioning test (see Article 4.3.3);
intermediate test (see Article 4.3.4);
recovery (see Article 4.3.5);
final test (see Article 4.3.6).
Additional notes:
This standard is proposed and managed by the National Technical Committee for Environmental Conditions and Environmental Tests for Electrical and Electronic Products. This standard was drafted by Guangzhou Electric Science Research Institute and other units. The main drafters of this standard are Shao Bei, Ye Siqin, Huang Yuzhou, Zhang Jingen, Zhu Yuechang and Liu Jingxiu.4 Temperature and relative humidity
During the test, the temperature in the test box (room): 15~~35℃; relative humidity: 45%~~75%. It can also be high temperature and low humidity conditions as required. 4.2.2.5 Duration
Unless otherwise specified, it should be 0.5, 1, 2h. 4.3 Test procedure
4.3.1 Pretreatment
Before starting up, the test samples should generally be placed in normal test atmospheric conditions for no less than 2h. 4.3.2 Initial inspection
According to the requirements of relevant standards, the test samples can be visually inspected and the electrical and mechanical properties tested. 4.3.3 Conditional test
4.3.3.1 The test samples should generally be placed in the test box (room) in an unpackaged, unpowered, and "ready to use" state. The total volume shall not exceed 1/3 of the effective volume of the test box (room), the sum of the cross-sectional areas of the test samples perpendicular to the wind direction shall not exceed 1/2 of this effective cross-sectional area, and the distance between the test samples and the inner wall of the test box (room) shall not be less than 100mm. 4.3.3.2 For the Class A enclosure of test condition I, connect the vacuum pump to it, and then blow the dust and exhaust the air. 4.3.3.3 According to the requirements of relevant standards, the test samples can withstand the load during the test. 4.3.3.4 After stopping the blowing, wait until the sand and dust are completely settled before taking out the test samples. 4.3.4 Intermediate testing
According to the requirements of relevant standards, the test samples can be tested during the test. During the test, the test samples shall not be taken out. 359
4.3.5 Recovery
GB2423.37
After the test samples are taken out, they should generally be placed under normal test atmospheric conditions for 1 to 2 hours. 4.3.6 Final test
According to the requirements of relevant standards, visual inspection and mechanical and electrical performance tests shall be carried out on the test samples. 4.4 When citing this standard, specific provisions shall be made for the following items: a.
Test conditions and shell types (see Article 4.2); pretreatment (see Article 4.3.1),
initial test (see Article 4.3.2);
conditioning test (see Article 4.3.3);
intermediate test (see Article 4.3.4);
recovery (see Article 4.3.5);
final test (see Article 4.3.6).
Additional notes:
This standard is proposed and managed by the National Technical Committee for Environmental Conditions and Environmental Tests for Electrical and Electronic Products. This standard was drafted by Guangzhou Electric Science Research Institute and other units. The main drafters of this standard are Shao Bei, Ye Siqin, Huang Yuzhou, Zhang Jingen, Zhu Yuechang and Liu Jingxiu.
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