GB/T 2423.27-2020 English PDF (GBT2423.27-2020)
GB/T 2423.27-2020 English PDF (GBT2423.27-2020)
GB/T 2423.27-2020: Environmental testing - Part 2: Test methods - Test method and guidance: Combined temperature or temperature and humidity with low air pressure tests
Environmental testing - Part 2.Test methods - Test method and guidance. Combined temperature or temperature and humidity with low air pressure tests ICS 19.040
National Standards of People's Republic of China
Replace GB/T 2423.25-2008, GB/T 2423.26-2008, GB/T 2423.27-2005
Environmental testing Part 2.Test methods
Test methods and guidelines. temperature/low pressure or
Temperature/humidity/low air pressure comprehensive test
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Test method 1
5 Final inspection 6
6 Information that should be given by relevant specifications 6
7 Information to be given in the test report 6
Appendix A (informative appendix) Temperature/low pressure or temperature/humidity/low pressure comprehensive test guide 8 Appendix NA (informative appendix) GB/T 2423 component 9
GB/T 2423 "Environmental Testing Part 2.Test Methods" is divided into several parts according to the test methods. Refer to Appendix NA for the components of GB/T 2423.
This part is part 27 of GB/T 2423.
This section was drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 2423.25-2008 "Environmental Testing of Electrical and Electronic Products Part 2.Test Method Test Z/AM. Low Temperature/low pressure comprehensive test", GB/T 2423.26-2008 "Environmental test of electrical and electronic products Part 2.Test method test Z/ BM. High temperature/low air pressure comprehensive test and GB/T 2423.27-2005 "Environmental testing of electrical and electronic products Part 2.Test methods Test Z/AMD. Low temperature/low air pressure/humid heat continuous comprehensive test". Compared with GB/T 2423.25-2008, GB/T 2423.26-2008 and GB/T 2423.27-2005, the main technical changes in this part are as follows. ---Combined the main technical aspects of GB/T 2423.25-2008, GB/T 2423.26-2008 and GB/T 2423.27-2005 Content and rearrange the structure of this part;
--- Deleted the "general description of the test", "description of the test equipment" and other aspects; --- Deleted the distinction between heat dissipation test samples and non-heat dissipation test samples in the test; ---Added Appendix A "Temperature/Low Pressure or Temperature/Humidity/Low Pressure Comprehensive Test Guide". The translation method used in this part is equivalent to the use of IEC 60068-2-39.2015 Environmental Testing Part 2-39.Test Test Methods and Guidance Then. temperature/low pressure or temperature/humidity/low pressure comprehensive test". The Chinese documents that have a consistent correspondence with the international documents cited in this section are as follows. ---GB/T 2421-2020 Environmental Test Overview and Guidelines (IEC 60068-1.2013, IDT) ---GB/T 2423.3-2016 Environmental Test Part 2.Test Method Test Cab. Constant Humidity Test (IEC 60068- 2-78.2012, IDT)
Compared with IEC 60068-2-39.2015, this part mainly makes the following editorial changes. ---The name of this part is changed to "Environmental Testing Part 2.Test Methods, Test Methods and Guidelines. Temperature/Low Pressure or Temperature/Humidity Degree/low air pressure comprehensive test";
---Informative appendix NA "Components of GB/T 2423" has been added.
This part is proposed and managed by the National Standardization Technical Committee on Environmental Conditions and Environmental Tests for Electrical and Electronic Products (SAC/TC8). Drafting organizations of this section. China Electrical Equipment Research Institute Co., Ltd., Shenzhen Urit Testing Technology Co., Ltd., AVIC Great Wall Metrology and Testing (Tianjin) Co., Ltd., Guangzhou Power Supply Bureau Co., Ltd. Electric Power Test Research Institute, Wuxi Soyat Test Equipment Co., Ltd., Jiangsu Topmilo Environmental Testing Equipment Co., Ltd., Nanjing Wuhe Testing Equipment Co., Ltd., Chongqing Hongrui Testing Instrument Co., Ltd., Guangdong Midea Health Huo Electric Manufacturing Co., Ltd., Bell Laboratory Equipment Jiangsu Co., Ltd., Zhejiang Institute of Metrology, Fujian Xinneng Offshore Wind Power Research Institute Development Center Co., Ltd., Shanghai Institute of Metrology and Testing Technology, Shenzhen Institute of Metrology and Quality Inspection, Ningbo Chinese Academy of Sciences Information Technology Applied Research Institute.
The main drafters of this section. Xu Xuedong, Liu Xin, Mei Liguang, Lu Guoyi, Wang Yong, Zhou Zhongming, Jin Jun, Zhang Yanjun, Zhang Dinghu, You Xianke, Yu Jianhong, Hua Ming, Zhang Hongyu, Huang Xiangsheng, Zhang Ailiang, Zhu Jianhua, Pan Yijie, Guan Zhijian, Liu Jing, Wang Yangming. The previous versions of the standards replaced by this part are as follows. ---GB 2423.25-1981, GB/T 2423.25-1992, GB/T 2423.25-2008;
---GB 2423.26-1981, GB/T 2423.26-1992, GB/T 2423.26-2008;
---GB/T 2423.27-1981, GB/T 2423.27-2005.
When exposed to different natural environmental conditions, the performance of equipment and components should not cause serious deterioration. For example, temperature, humidity, low Air pressure synthesis may only have a certain effect on components and gaskets. The types and severity of environmental parameters depend on the operating, transportation, and storage environments exposed to equipment and components. Environmental impact on equipment performance It is very different in the tropics and humid tropics and the Arctic. Different environmental parameters will cause various or overlapping effects on equipment and components. Added effect.
Manufacturers try to ensure that, at the same time, users also hope that equipment and components can withstand the impact of the environment during the service life. Can be passed The test samples are exposed to a laboratory that simulates a series of environmental parameters to test whether the equipment meets this expectation. Usually by raising the ring The severity of the environmental parameters can achieve meaningful results in a relatively short period of time. This can be used to evaluate similar actual environmental conditions. Environmental testing Part 2.Test methods
Test methods and guidelines. temperature/low pressure or
Temperature/humidity/low air pressure comprehensive test
This part of GB/T 2423 gives the test methods for the temperature/low pressure or temperature/humidity/low pressure comprehensive test of equipment or components. Law and its guidelines.
The purpose of the comprehensive test is to study the influence of temperature/low pressure or temperature/humidity/low pressure comprehensive test on equipment or components. Comprehensive test methods are used to evaluate electrical properties, mechanical properties or other physical properties. 2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. IEC 60068-1 Environmental Testing Part 1.Overview and Guidelines
IEC 60068-2-78 Environmental Test Part 2-78.Test Test Cab. Constant Damp Heat 3 Terms and definitions
4 Test method
All values of test parameters, such as low temperature, high temperature, low air pressure, humidity, test time and running status of test samples, etc., should be from Selected from IEC 60068-2 and related specifications.
The duration of the test shall be calculated from the time the test sample reaches a stable temperature under low pressure conditions. Temperature stability according to IEC 60068-1 Regulations.
The test should preferably be carried out under low wind speed conditions. 4.2 Recommended comprehensive test
Temperature, low pressure and test time can be selected from Table 1.
Table 1 Test severity level
4.3 Initial measurement and function check
The test sample shall be inspected for appearance, size and function according to relevant specifications. 4.4 Test method
Carry out the pretreatment of the test sample according to relevant specifications. 4.4.2 Temperature/low pressure test
Figures 1 and 2 show examples of temperature/low pressure tests.
The test sample is placed in the test box as required (unpackaged, yes/no electrified, etc.). The test chamber should be adjusted to the required temperature according to 4.1.The temperature change rate should not exceed 1K/min. The test sample should reach temperature stable.
The energized test samples should be checked for functions in accordance with the requirements of relevant specifications. Intermediate inspections shall be carried out in accordance with the requirements of relevant regulations. The air pressure in the test chamber should be reduced to the required value in accordance with 4.1.The rate of change of air pressure should not exceed 15kPa/min. The temperature and air pressure should be maintained for the corresponding time in accordance with 4.1. Then the air pressure should return to its normal value, at a rate not exceeding 15kPa/min. During the pressure rise, there is no need to control the temperature. test The sample is placed in the test chamber until the temperature reaches standard atmospheric conditions. The temperature change rate should not exceed 1K/min. The test sample is restored as required.
4.4.3 Temperature/humidity/low pressure test
Figure 3 shows an example of temperature/humidity/low pressure test.
The test sample is placed in the test box as required (unpackaged, yes/no electrified, etc.). The test chamber should be adjusted to the required temperature according to 4.1.The temperature change rate should not exceed 1K/min. The test sample should reach temperature stability. Perform functional tests according to relevant specifications. Intermediate testing shall be carried out in accordance with regulations or relevant specifications. Maintain the specified temperature according to 4.1.The air pressure in the test chamber is reduced to the specified value according to 4.1.Decrease speed of air pressure The rate should not exceed 15kPa/min.
The temperature and low air pressure should be maintained for the specified time in accordance with 4.1. Water vapor is passed into the test chamber in a form that can form fog on the surface of the test sample. Then, make the temperature reach The temperature of the laboratory.
When the temperature rises between 0°C and 5°C, the low air pressure should rise to the normal value at a rate not exceeding 15kPa/min. Pressure rise period During the period, the temperature should not be controlled. The temperature/humidity is maintained at the specified value, in accordance with the requirements of relevant specifications or IEC 60068-2-78.Temperature and humidity conditions Should be maintained for the specified time in accordance with 4.1.
The test sample should be restored under the specified conditions.
5 Final inspection
The test sample shall be inspected for appearance, size and function according to relevant specifications. The relevant specifications shall provide the basis for whether the test sample passes the test. 6 Information that should be given by relevant specifications
The relevant specifications should at least give the following information. a) Test time;
b) Temperature at low pressure;
c) Low pressure value;
d) The temperature value when determining the humidity;
e) humidity value;
f) Type of test procedure;
h) Type and scope of initial testing;
i) Type and scope of intermediate testing;
k) The type and scope of the final inspection;
l) Test criteria;
m) Type and scope of test report.
7 Information to be given in the test report
The test report should contain at least the following information.
a) Customer (name and address);
b) Testing laboratory (name and address, accreditation details, if any); c) Test date (date when the test was conducted);
d) Test type (e.g. temperature/low pressure, temperature/humidity/low pressure); e) Test requirements (temperature, low air pressure, etc.);
f) Test purpose (R and D, identification, etc.);
g) Test standard and version (GB/T 2423.27, version used);
h) Related laboratory test procedures (code and issue number);
i) Description of test samples (drawings, photos, quantity, composition status, etc.); j) Test box (manufacturer, model, unique code, etc.);
k) Test equipment performance (set point temperature control, etc.);
l) Wind speed and direction (air speed and direction of air flow blowing towards the test sample); m) Uncertainty of the measurement system (uncertainty data);
n) Calibration date (the date of the last calibration and the next calibration); o) Initial, intermediate and final inspections (initial, intermediate and final inspections); p) The required severity level (obtained from relevant specifications); q) Actual test conditions (measurement points, data, etc.);
r) The performance of the test sample (function test results, etc.);
s) Observations and measures taken during the test (any relevant observations); Appendix A
Temperature/low pressure or temperature/humidity/low pressure comprehensive test guide A.1 Overview
Based on the parts of the IEC 60068-2 series, this appendix provides basic tests for temperature/low pressure, temperature/humidity/low pressure comprehensive tests evaluation of.
For the purpose of comprehensive testing, IEC 60068-1 should be used together with the preferred severity levels listed in the IEC 60068-2 series. A.2 Environmental effects
A.2.1 The temperature/low pressure comprehensive test generally has the following effects on the test sample. a) Compared with the specified value, the change of the surface temperature and temperature gradient of the heat dissipation sample is caused by the decrease of the convection coefficient under low air pressure. Into. Although the surface temperature can be increased by using a higher test temperature under normal air pressure, this test The temperature value cannot be determined, and the correct temperature gradient cannot be achieved without the combination of low air pressure. b) Low pressure gas and changes in air dielectric properties cause changes in the function and safety performance of the test sample. Under low pressure, special Especially when combined with high temperature, the dielectric strength of the air is significantly reduced, resulting in an increased risk of arcing, surface or corona discharge. c) The change in material properties caused by low or high temperature increases the risk of deformation or rupture of sealed equipment or components under low air pressure. A.2.2 Mainly caused by temperature, the effect of significant acceleration due to low air pressure is. a) As the mechanical and electrical properties of each part of the test sample change, plasticizers and plastic degradation products volatilize. These volatile The product can condense on nearby surfaces and/or produce changes in characteristics, corrosion and/or degradation. b) Evaporation of lubricant may block moving parts.
c) Dissolved gas escapes from the liquid. The reduced low air pressure may cause a brief boiling and may leak the liquid. A.3 Temperature measurement
The decrease in convection coefficient due to low air pressure makes the heat exchange efficiency of the gas in the box and the thermometer sensor element for temperature monitoring reduce.
---The response time of the thermometer to temperature changes is greater than normal pressure; ---The thermometer is more sensitive to the heat radiation of the sample. In response to these consequences, a shield can be placed between the thermometer and the test sample to reduce the effect of thermal radiation. To compensate for temperature The response time of the meter may require a longer measurement time.