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GB/T 2424.15-2008: Environmental testing -- Guide for combined temperature/low air pressure tests
Status: Valid GB/T 2424.15: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 2424.15-2008 | English | 134 |
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Environmental testing -- Guide for combined temperature/low air pressure tests
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GB/T 2424.15-2008
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| GB/T 2424.15-1992 | English | 239 |
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Basic environmental testing procedures for electric and electronic products--Guide for combined temperature/low air pressure tests
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GB/T 2424.15-1992
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PDF similar to GB/T 2424.15-2008
Basic data | Standard ID | GB/T 2424.15-2008 (GB/T2424.15-2008) | | Description (Translated English) | Environmental testing -- Guide for combined temperature/low air pressure tests | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K04 | | Classification of International Standard | 19.040 | | Word Count Estimation | 7,718 | | Date of Issue | 2008-12-30 | | Date of Implementation | 2009-10-01 | | Older Standard (superseded by this standard) | GB/T 2424.15-1992 | | Adopted Standard | IEC 60068-3-2-1976, IDT | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 23 of 2008 (No. 136 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the temperature/low air pressure tests, involving the application of a series of ground or air pressure. This section does not apply to the test pressure is less than 1kPa. | GB/T 2424.15-2008: Environmental testing -- Guide for combined temperature/low air pressure tests---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Environmental testing. Guide for combined temperature/low air pressure tests
ICS 19.040
K04
National Standards of People's Republic of China
GB/T 2424.15-2008/IEC 60068-3-2. 1976
Replacing GB/T 2424.15-1992
Environmental testing for electric and electronic products
Temperature/low air pressure tests Guide
(IEC 60068-3-2. 1976, Basicenvironmentaltestingprocedures-
Part 3. Backgroundinformation-Sectiontwo-Combinedtemperature/low
airpressuretests, IDT)
Posted 2008-12-30 2009-10-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Preface Ⅰ
1 Scope and normative references 1
General Description 1 2
3 Environmental Impact 2
Test equipment 3 4
Measuring environmental parameters 3 5
Figure 1 combined effects of air pressure and air flow rate of the surface temperature of the test sample of 2
GB/T 2424.15-2008/IEC 60068-3-2. 1976
Foreword
GB/T 2424 contains the following sections.
--- GB/T 2424.1 electric and electronic products environmental testing high temperature and low temperature tests
--- GB/T 2424.2 electric and electronic products environmental testing for damp heat tests
--- GB/T 2424.5 electric and electronic products environmental testing to confirm performance of temperature chambers
--- GB/T 2424.6 electric and electronic products environmental testing temperature/humidity chamber performance confirmed
--- GB/T 2424.7 electric and electronic products environmental testing test A and B (with load) measure the temperature of the chamber
--- GB/T 2424.10 electric and electronic products environmental testing procedures for atmospheric corrosion accelerated testing of common guidelines
--- GB/T 2424.13 Environmental testing for electric and electronic products Part 2. Test methods for temperature change Test Guidelines
--- GB/T 2424.14 Environmental testing for electric and electronic products Part II. Test methods for solar radiation testing
--- GB/T 2424.15 Environmental testing for electric and electronic products - Part 3. temperature/low air pressure tests Guide
--- GB/T 2424.17 Environmental testing for electric and electronic products soldering Test Guidelines
--- Environmental Test Guidelines GB/T 2424.19 electric and electronic products environmental testing simulated the effects of storage
--- GB/T 2424.22 electric and electronic products environmental testing procedures for temperature (cold and heat) and vibration (sinusoidal) test
Test guidelines
--- GB/T 2424.25 Environmental testing for electric and electronic products - Part 3. Test methods for seismic test guidelines
--- GB/T 2424.26 Environmental testing for electric and electronic products - Part 3. Supporting documentation and guidance vibration test selection
This section GB/T 2424 Part 15. This section identical with IEC 60068-3-2. 1976 "Basic environmental testing procedures
Part 3. Background information - Section 2. temperature/low air pressure tests "(in English).
According to GB/T 1.1-2000 "Standardization Guide Part 1. Structure and rules are written standard" requirements for formatting into
The following editorial changes.
--- Remove the new international standards and national standards foreword foreword;
--- Increasing the normative references;
--- "Edition" to "this Part";
--- To modify the pressure unit mbar kPa.
This Part replaces GB/T 2424.15-1992 "electric and electronic products environmental testing procedures for temperature/low air pressure tests guide
then".
This section compared with the GB/T 2424.15-1992 main changes are as follows.
--- Adjust the structure of the chapters to make it consistent with the IEC in its original structure;
--- Modify the standard conditions 3.1 (35 ℃ and 101.3kPa) to (25 ℃ and 101.3kPa);
--- Viscosity into absolute viscosity;
--- Deleted "NOTE. For professional electrician products, especially voltage above 1000V electrical products, the Department amended its environmental conditions
Number accordance with relevant standards. "(1992 version 4.1.2).
This part of the National Electrical and Electronic Products Environmental conditions and environmental tests Standards Technical Committee (SAC/TC8) and focal points.
This section is drafted. Guangzhou Electric Apparatus Research Institute, Guangzhou CVC Testing Institute, Chongqing Sida Test Equipment Co., Ltd.
The main drafters of this section. Liugong Gui, Xiao Li, Chen Yunsheng.
This part of the alternative criteria previously issued as follows.
--- GB/T 2424.15-1981, GB/T 2424.15-1992.
GB/T 2424.15-2008/IEC 60068-3-2. 1976
Environmental testing for electric and electronic products
Temperature/low air pressure tests Guide
1 Scope and normative references
1.1 Scope
Temperature/low air pressure tests of this GB/T 2424 regulations, involving a series of ground or aerial application of air pressure.
This section does not apply to the pressure less than 1kPa tests.
1.2 Normative references
The following documents contain provisions which, through reference to GB/T 2424 to the present, constitute provisions of this section. For dated reference documents
Member, subsequent amendments (excluding corrections) or revisions do not apply to this section, however, encouraged to reach an agreement in accordance with this section
Whether the parties can study the latest versions of these documents. For undated reference documents, the latest versions apply to this section.
GB/T 2424.1-2005 Environmental testing for electric and electronic products of high temperature and low temperature tests (IEC 60068-3-1. 1974, IDT)
2 General Description
Air density within the range specified in this part, the mean free path of air molecules is always tenths of a millimeter, and thus thermal conductivity and air
Absolute viscosity were nothing to do with pressure. Air flow are generally stagnant or turbulent flow pattern type, subject to the various laws atmospheric pressure.
Free air convection and forced air convection heat transfer of these two basic rules of normal atmospheric pressure and at the same. therefore,
GB/T 2424.1 requirements for the convection terms also apply to (at least under normal circumstances applicable) low air pressure tests.
Air density ρ decreases greatly reduce air convection heat transfer coefficient αc, αc is ρ
Like function, whether it is free or forced convection
Convection, like 0.5 to 0.7.
Pressure within the scope of this provision, the test under conditions of forced air flow than the surface of the sample temperature under "free air" conditions greatly
Decrease in air temperature and cooling conditions remain unchanged, the average surface temperature of the test sample with the air flow rate and pressure changes as a graph
1 shown in FIG.
Therefore, the test method specified cooling test samples using "free air" conditions (no forced air circulation), or a lower air
Flow rates to achieve additional cooling air flow could be ignored.
αc with decreasing air density decreases, the heat radiation will become important, especially at low air pressure.
Under low pressure conditions, we should pay attention to the effects of radiation, should pay attention to controlling the transmission rate and the temperature of the wall box walls of the box.
Due to thermal radiation at low air pressure increases, the same test chamber each other between the thermal radiation heat test samples may be very
Great, that affect test reproducibility.
To avoid the reproducibility of the test chamber affect the test only once installed a heat test sample tests.
Test cooling test samples used in "free air" chamber size requirements based on the graph of atmospheric pressure used, because the average molecular
Free path with respect to the size of the chamber is a very small value.
GB/T 2424.15-2008/IEC 60068-3-2. 1976
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