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GB/T 2424.6-2021: Environmental testing - Part 3: Supporting documentation and guidance - Confirmation of the performance of temperature/humidity chambers
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Environmental testing - Part 3: Supporting documentation and guidance - Confirmation of the performance of temperature/humidity chambers
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GB/T 2424.6-2021
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| GB/T 2424.6-2006 | English | 359 |
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Environmental testing for electric and electronic products -- Confirmation of the performance of temperature/humidity chambers
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GB/T 2424.6-2006
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| GB 2424.6-1981 | English | 199 |
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Electric and electronic products--Basic environmental test regulations for electricians--Guidelines for free falling tests
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Basic data | Standard ID | GB/T 2424.6-2021 (GB/T2424.6-2021) | | Description (Translated English) | Environmental testing - Part 3: Supporting documentation and guidance - Confirmation of the performance of temperature/humidity chambers | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K04 | | Word Count Estimation | 18,115 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 2424.6-2021: Environmental testing - Part 3: Supporting documentation and guidance - Confirmation of the performance of temperature/humidity chambers
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(Environmental Test Part 3.Supporting Documents and Guidelines Temperature/Humidity Test Chamber Performance Confirmation)
ICS 19.040
CCSK04
National Standards of People's Republic of China
Replace GB/T 2424.6-2006
Environmental Testing Part 3.Supporting Documents and Guidelines
Temperature/humidity test chamber performance confirmation
(IEC 60068-3-6.2018,Environmentaltesting-Part 3-6.Supporting
Released on 2021-05-21 and implemented on 2021-12-01
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅲ
Introduction Ⅳ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Performance measurement 4
5 Information that should be given in the performance test report 11
Appendix NA (informative) GB/T 2424 component 12
Reference 13
Figure 1 Example of humidity difference 3
Figure 2 Workspace 3
Figure 3 Location of temperature/humidity sensors in a temperature/humidity box with a volume of less than.2000L 5
Figure 4 The placement position of the least additional temperature sensor in a temperature/humidity cabinet with a volume of more than.2000L 6
Figure 5 Example of reaching humidity 7
Figure 6 Example of stable temperature/humidity 7
Figure 7 Example of humidity fluctuation 8
Figure 8 Example of humidity gradient of a volume test chamber below.2000L 9
Figure 9 Example of the difference in the relative humidity of the space of a test chamber with a volume of less than.2000L 10
Figure 10 Example of a climate chart 11
Table 1 Actual size 4
Table 2 Example of test sequence 10
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document is Part 6 of GB/T 2424.The components of GB/T 2424 are shown in Appendix NA.
This document replaces GB/T 2424.6-2006 "Environmental Test Temperature/Humidity Test Chamber Performance Confirmation for Electrical and Electronic Products", and
Compared with GB/T 2424.6-2006, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) Modified the definition of "relative humidity gradient" (see 3.11, 3.12 in the.2006 edition);
b) The terms and definitions of "spatial relative humidity difference" have been added (see 3.12);
c) In Chapter 4, the "test site environment", "sample load", "temperature and humidity sensor placement" and "measurement method" have been added.
Content (see 4.1, 4.5, 4.6 and 4.7);
d) Modified "Information that should be given in the performance test report" (see Chapter 5, Chapter 8 of the.2006 edition).
The translation method used in this document is equivalent to the adoption of IEC 60068-3-6.2018 Environmental Testing Part 3-6.Supporting Documents and Guidelines
Performance Confirmation of Degree/Humidity Test Chamber".
The Chinese documents that have consistent correspondence with the normatively cited international documents in this document are as follows.
---GB/T 2424.5-2021 Environmental Test Part 3.Supporting Documents and Guidelines Temperature Test Chamber Performance Confirmation
(IEC 60068-3-5.2018, IDT);
---GB/T 2424.7-2006 Electrical and electronic products environmental test test A and B (with load) temperature test box measurement
(IEC 60068-3-7.2001, IDT);
---GB/T 2424.27-2013 Environmental Test Supporting Documents and Guidelines, Calculation of Uncertainty of Temperature and Humidity Test Chamber
(IEC 60068-3-11.2007, IDT).
This document has made the following editorial changes.
---The name of this document is changed to "Environmental Testing Part 3.Supporting Documents and Guidelines for Temperature/Humidity Test Chamber Performance Confirmation";
---Added the appendix "GB/T 2424 standard components" (see appendix NA).
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents.
This document was 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 document. China National Electrical Equipment Research Institute Co., Ltd., AVIC Great Wall Metrology and Testing (Tianjin) Co., Ltd., Jiangsu Top
Miluo Environmental Testing Equipment Co., Ltd., Hainan Power Grid Co., Ltd. Electric Power Research Institute, Guangdong Power Grid Co., Ltd. Guangzhou Power Supply
Bureau, Beijing University of Aeronautics and Astronautics, Chongqing Galaxy Test Instrument Co., Ltd., Wuxi Soyat Test Equipment Co., Ltd., Tsinghua University Shenzhen International
Graduate School, Chongqing Artec Technology Co., Ltd., Chongqing Umatec Instrument Co., Ltd., Comprehensive Instrumentation Technology of Machinery Industry
Economic Research Institute, Shenzhen Vocational and Technical College, Weiss Fuchs Environmental Testing Instrument (Taicang) Co., Ltd., Hohai University Changzhou Campus, Fujian Province
Energy Offshore Wind Power R&D Center Co., Ltd., Hainan Power Grid Co., Ltd., Shanghai Institute of Metrology and Testing Technology.
The main drafters of this document. Qin Hanjun, Lu Guoyi, Zhang Yanjun, Xu Xuedong, Pang Songling, Wang Yong, Wu Sa, Li Shushan, Zhou Zhongming, Jia Zhidong,
Zhang Jie, Lin Guangxi, Li Siyuan, Yu Zhan, Fan Qingfeng, Zhang Zhen, Xie Xianbin, Zhang Yingbin, Zhang Ailiang, Huang Qingdan, Wang Xilin, Wang Lei, Wu Haitao.
The previous versions of this document and the documents replaced are as follows.
---In.2006, it was first published as GB/T 2424.6-2006;
---This is the first revision.
Introduction
IEC 60068 (all parts) contains basic information about environmental test procedures and severity.
The term "environmental regulation" or "environmental test" refers to the nature of the use, transportation, and storage of equipment or parts that may actually be located.
Or performance evaluation in an artificial environment.
Although the method of maintaining and measuring temperature and/or humidity has a great influence on the test results, it is not described in any publication for
"Environmental conditioning" or "environmental test" temperature/humidity chamber. The physical characteristics of the temperature/humidity chamber will also affect the test results.
In this series of standards, each document in GB/T 2424 "Environmental Testing Part 3.Supporting Documents and Guidelines" gives a set of rings.
Background information on environmental testing.
Since 1981, GB/T 2424 has issued more than 20 documents (13 current national standards, 12 of which adopt IEC 60068
"Environmental Test"), the current GB/T 2424 components are detailed in Appendix NA.
In this revision of GB/T 2424.6, the use of the translation method is equivalent to the adoption of IEC 60068-3-6.2018 ``Environmental Testing Part 3-6.
Supporting documents and guidelines for temperature/humidity test chamber performance confirmation, revised to be consistent with the level of international standards, which is conducive to eliminating technicalities
Trade barriers to better promote trade, exchanges and technical cooperation.
Environmental Testing Part 3.Supporting Documents and Guidelines
Temperature/humidity test chamber performance confirmation
1 Scope
This document provides a uniform and reproducible method for confirming whether the temperature/humidity test chamber complies with
IEC 60068-2 (all parts) climatic test method and other standard requirements. This document is suitable for users to carry out conventional test chambers
Performance monitoring.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations
Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
This document.
IEC 60068-3-5 Environmental Test Part 3-5.Supporting Documents and Guidelines Temperature Test Chamber Performance Confirmation (Environmental
testing-Part 3-5.Supportingdocumentationandguidance-Confirmationoftheperformanceoftem-
peraturechambers)
IEC 60068-3-7 Environmental Testing Part 3-7.Supporting documents and guidelines for testing A (low temperature) and B (high temperature) (with load)
Temperature box measurement [Environmental testing-Part 3-7.Supporting documentation and guidance-
MeasurementsintemperaturechambersfortestsA(Cold)andB(Dryheat)(withload)]
IEC 60068-3-11 Environmental Testing Part 3-11.Supporting Documents and Guidelines Climatic Test Chamber Uncertainty Calculation (Environ-
mentaltesting-Part 3-11.Supportingdocumentationandguidance-Calculationofuncertaintyof
conditionsinclimatictestchambers)
3 Terms and definitions
The following terms and definitions apply to this document.
The URLs of the main ISO and IEC technical data used in this document are as follows.
Note 1.For the terms and definitions of the temperature test, see IEC 60068-3-5.
Note 2.Unless otherwise specified, "humidity" refers to relative humidity (RH).
3.1
Temperature/humiditychamber
Enclosed body or space, some part of which can reach the temperature/humidity conditions specified in IEC 60068-2 (all parts).
Note. See IEC 60068-3-4.
3.2
Absolute humidity
The mass of water vapor per unit volume of humid air.
Note. The commonly used unit of measurement is g/m3.
3.3
Dewpoint
Td
The partial pressure of water vapor in the air is equal to the temperature when the water vapor pressure is saturated on the water surface.
3.4
Saturationvapourpressure
The maximum water vapor pressure generated when water vapor is in equilibrium with its solid or liquid state. Any increase in the maximum water vapor pressure will cause the water vapor to become more
Add a concentrated state.
3.5
Partialvapourpressure
At a certain temperature, in a given volume of air, the part of the water vapor pressure in the atmospheric pressure.
3.6
Relative humidity
RH
At a certain temperature, in a given volume of air, the ratio of water vapor partial pressure to saturated water vapor pressure, expressed as a percentage.
Note. Relative humidity is the most commonly used method of expressing the water vapor content in the air.
3.7
Temperature/humidity stabilization
Within the specified time, the temperature/humidity of all points in the work space reaches and maintains within the given tolerance of the temperature/humidity set value.
3.8
Reached humidity achievedhumidity
After stabilization, the humidity in the center of the work space reaches and maintains within a given tolerance of the set value.
3.9
Climate graph climatogram
A graph that combines temperature and relative humidity.
Note. See Figure 10.
3.10
Relative humidity fluctuation relativehumidityfluctuation
After stabilization, the difference between the highest and lowest humidity at a specified point in the work space within a specified time interval.
Note. When calibrating, the center point of the working space can be used.
3.11
Relative humidity gradient
After stabilization, at any time, the maximum difference in the average humidity between two points in the working space.
Note 1.In the entire working space, the absolute humidity of the air can be regarded as the same.
Note 2.See Figure 1.
4 Performance measurement
4.1 Environment of the measurement site
The environment around the temperature/humidity test chamber may affect the conditions in the test chamber.
The performance confirmation of the temperature/humidity test chamber should be carried out under the standard atmospheric conditions specified in IEC 60068-1.
4.2 Measuring system
In the evaluation of the temperature/humidity test chamber, a temperature/humidity measurement system independent of the control system of the test chamber should be used.
4.3 Temperature measurement system
See IEC 60068-3-5.
4.4 Humidity measurement system
The measurement uncertainty output by the measurement system should be determined by the calibration of the system and can be traced to ISO 10012.Total uncertainty
The degree is expressed in accordance with ISO /IEC Guide 98-3.
The following are some typical humidity measurement systems, but not limited to the following methods.
a) Dry and wet bulb method
Using the cooling effect of water evaporation from the wet bag, a temperature sensor is used to measure the temperature of the wet bag, and at the same time, a second temperature sensor is used to measure the temperature of the wet bag.
Measure the temperature of the air.
b) Chilled mirror dew point method
Cool the mirror surface until condensation appears. The temperature shown is the dew point temperature.
c) Lithium chloride sensor
This method measures the absolute humidity value (dew point temperature).
d) Capacitive sensor
Using moisture penetration to change the dielectric properties of certain materials, the relative humidity can be directly measured.
4.5 Sample load
All of the following measurements were made in an empty work space. For the measurement when there is a load (heating or non-heating), see
IEC 60068-3-7.
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