This test method can also be used to assess the minimum strength level of safety requirements. This test method is mainly applicable to unpackaged test samples and test samples in packaging boxes that can be regarded as part of the test sample itself. GB/T 2423.7-1995 Environmental testing for electric and electronic products Part 2: Test method Test Ec and guidance: Tipping and overturning (mainly for equipment type samples) GB/T2423.7-1995 Standard download decompression password: www.bzxz.net

GB/T 2423.7--1995
This standard is revised based on the 1969 edition of the International Electrotechnical Commission standard IEC68-2-31 "Environmental testing Part 2: Test methods Test Ec and guidance for tipping and tipping (mainly for equipment type samples)" and the first amendment (1982) of IEC68-2-31 (1969) "Environmental testing Part 2: Test methods Test Ec and guidance for tipping and tipping (mainly for equipment type samples)" Appendix A guidelines. And the standard is adopted as such.
This standard replaces GB2423.7--81 "Basic environmental testing procedures for electrical and electronic products Test Ec: Tipping and tipping test methods" and GB2424.5--81 "Basic environmental testing procedures for electrical and electronic products Tipping and tipping test guidelines". GB2423.7-81 and GB2424.5-81 were drafted with reference to the first edition of IEC68-2-31 in 1969, and the standard was divided into two standards. The main text (test method) was formulated as GB2423.7-81, and the appendix part of the guide was formulated as GB2424.5-81. This revision merged the two standards into one standard according to the principle of equivalence, and was revised according to the guidelines in Appendix A of IEC68-2-31, the first amendment (1982) "Environmental testing Part 2: Test methods Test Ec and guidelines for tipping and overturning (mainly for equipment type samples)". This standard was first issued in 1981 and revised for the first time in August 1995. From the date of implementation of this standard, the original national standard of the People's Republic of China GB2423.7-81 "Basic standard test procedures for electric and electronic products Test Ec: Tipping and overturning test method" and GB2424.5--81 "Basic environmental test procedures for electric and electronic products Tipping and overturning test guide" shall be abolished at the same time.
Appendix A of this standard is the appendix of the standard.
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Environmental Conditions and Environmental Testing of Electric and Electronic Products. The drafting units of this standard are: Shanghai Electric Science Research Institute of the Ministry of Machinery Industry, the First Research Institute of the Ministry of Posts and Telecommunications, and the Fifth Research Institute of the Ministry of Electronics. The main drafters of this standard are: He Jinkang, Yu Zhanquan, Wang Yuchun, Wei Bei, and Wang Shurong. 98
GB/T2423.7-1995
This standard is formulated by IEC Technical Committee 50 (Environmental Testing) 50A Sub-Technical Committee (Shock and Vibration Testing). The first draft was discussed at the London Conference in 1966, and a new draft was discussed at the Stockholm Conference in 1968. The results of the discussion were finalized in September 1968 and submitted to the national committees for voting according to the "six-month method". The following members voted explicitly in favor of this standard: Australia
Israel
Belgium
Romania
Hungary
Czechoslovakia
Austria
Federal Republic of Germany
Canada
Turkey
National Standard of the People's Republic of China
Environmental testing for electric and electronic productsPart 2: Test methods
Test Ec and guidance: Drop and topplePrimarily for equipment-type specimens1 Purpose
GB/T2423.7--1995
idt IEC 68-2-31:1982
Replaces: GB2423.7---81
GB2424.581
Provides a simple standard test method for determining the effects of falls and overturning on test specimens. This test method is used to simulate the effects of knocks and impacts on test specimens that may occur when the test specimens are subjected to maintenance operations or rough handling on workbenches or laboratory tables.
This test method can also be used to assess the minimum strength level required for safety. This test method is mainly applicable to unpackaged test specimens and test specimens in packaging boxes that can be regarded as part of the test specimens themselves.
2 General remarks
This test includes the following three different methods: a) flat fall (see 3.2.1);
b) corner fall (see 3.2.2);
c) overturn (or push-over) (see 3.2.3). The purpose of these three methods is basically the same, but it still simulates different types of operation (or moving) methods. This test method is not an accurate test method. The allowable error of the height and angle specified in Chapter 3 is ±10%. Note: If a more accurate impact test is required, GB/T2423.5--1995 "Environmental testing of electrical and electronic products Part 2: Test methods Test Ea and guidance: Impact" (IEC68-2-27:1987) should be applied. 3 Test procedure
3.1 Initial inspection
The test sample should be inspected for appearance and tested for electrical and mechanical properties in accordance with the provisions of the relevant specifications. 3.2 Conditional test
Taking into account the way the test sample is operated (or moved) during use and maintenance, the relevant specifications should specify the test method used and whether the cover, cable, etc. are installed in the appropriate position. The relevant specifications should also specify whether the test sample is in working condition during the test. In the face drop or angle drop test, the test sample may fall over on another surface instead of falling back on the expected test surface. Appropriate methods should be used to avoid the above situation. Approved by the State Administration of Technical Supervision on August 29, 1995 100
Implementation on August 1, 1996
GB/T2423.7—1995
No matter which test method is used, the test sample is not allowed to continue rolling around the adjacent edge. If the number of bottom edges of the test sample is more than 4, the number of falls and overturns should be limited to 4 times, and the relevant specifications should specify the bottom edges used for the test.
3.2.1 Surface drop
3.2.1.1 The test sample should be placed on a smooth, hard and rigid (concrete or steel) table in the normal use position, and tilted around the bottom edge until the distance between the opposite edge and the test table is 25mm, 50mm or 100mm (according to the relevant specifications) or the bottom surface of the test sample forms an angle of 30° with the test table, whichever is smaller. Then, the test sample is allowed to fall freely on the test table. 3.2.1.2 The test sample should be subjected to a drop test around each of the four bottom edges. 3.2.2 Angle drop
3.2.2.1 The test sample should be placed on a smooth, hard and rigid (concrete or steel) table in the normal use position, and a 10mm high wooden column is placed under one corner of the test sample, and a 20mm high wooden column is placed under another corner of the adjacent side to raise the test sample. Then, rotate the test sample around the edge supported by the two wooden posts, and lift the test sample above the test table surface until the other side of the test sample adjacent to the 10mm wooden post is raised to 25mm, 50mm or 100mm (as specified in the relevant specifications) or the test sample forms an angle of 30° with the test table surface, whichever is smaller. Then, let the test sample fall freely on the test table surface. 3.2.2.2 Each of the four bottom corners of the test sample should be subjected to a tipping test. 3.2.3 Overturning (or pushing over)
3.2.3.1 The test sample should be placed on a smooth, hard and rigid (concrete or steel) table surface in its normal use position, and tilted around one bottom edge until it is in an unstable position. Then, let it freely overturn from this position onto the adjacent surface. 3.2.3.2 Each of the four bottom edges of the test sample should be subjected to an overturning test. 3.3 Final inspection
The test samples shall be inspected for appearance and tested for electrical and mechanical properties in accordance with the requirements of the relevant specifications. 4 Contents to be given in the relevant specifications
4.1 For the test samples expected to be subjected to this test, the following two dimensional ratios are important: a) the ratio of the height of the center of gravity of the test sample from the bottom surface to the smaller dimension of the bottom surface, hereinafter referred to as the "Cg ratio"; b) the ratio of the height of the test sample to the smaller dimension of the bottom surface, hereinafter referred to as the "height ratio". If the "Cg ratio" is small (for example, less than 0.25), the test sample cannot be overturned even if it is subjected to a sudden lateral push; if the "height ratio" is small (for example, less than 0.5), the top of the test sample cannot be overturned even if it is subjected to a sudden lateral thrust or blow. In these cases, the compilers of the relevant specifications should consider whether the above-mentioned overturning test is applicable. 4.2 Contents to be given in the relevant specifications:
When the relevant specifications adopt this test, the following contents shall be given: a) Initial test (3.1),
b) Condition test (3.2);
c) Installation of covers and cables, etc. (3.2); d) Whether the test sample is running during the test (3.2); e) Number of bottom edges used for the test (when there are more than 4 bottom edges) (3.2); f) Height of face drop (3.2.1.1); g) Height of corner drop (3.2.2.1); h) Final test (3.3).
A1 Purpose
GB/T2423.7--1995
Appendix A
(Appendix to the standard)
Guidelines
The purpose of the drop and overturn test is to simulate the effects of knocks and impacts that may be received by samples of the main equipment type when they are violently moved on the workbench or during use.
This test is usually only applicable to small and medium-sized equipment that may be subjected to violent handling, and only to corners and surfaces that may be subject to knocks and impacts. wwW.bzxz.Net
Generally speaking, equipment that is frequently moved and used (such as field equipment and spare parts) may be subject to the above knocks and impacts. However, when they form an integral part of a permanent installation, they are usually not subject to the above knocks and impacts, so this test is not required. This test is not applicable to vulnerable unprotected equipment or equipment of irregular shape (such as aircraft nose radar), because these equipment are usually installed on a bracket or in a transport rack when they are taken out of the fixed installation. However, this test is also applicable when these equipment are in their shipping containers, or on their own brackets, or in transport racks, and are considered as a whole. For equipment with only one mounting surface (such as a standard bottom surface), the test is usually carried out only on this surface. When the size of the sample can keep itself stable during transportation, such samples do not need to be subjected to the overturn test. To determine whether the tipping and overturning tests are necessary, please refer to the information on "Cg ratio" and "height ratio" in Article 4.1 of this standard. The tipping and overturning actions produced by the test procedures specified in Articles 3.2.1, 3.2.2 and 3.2.3 of this standard are shown in Figures A1, A2 and A3 of this appendix.
Tests related to A2
Test Ea and Guide: Shock GB/T2423.5--1995IEC68-2-27) This test simulates the effects of non-repetitive shocks that equipment and components may be subjected to during transportation or in use. Test Eb and Guide: Collision GB/T2423.6-1995 (IEC68-2-29) This test simulates the effects of multiple repetitive shocks that equipment and components may be subjected to during transportation or installed in different types of vehicles.
Test Ed: Free fall GB/T2423.8--1995 method—(IEC68-2-32 method—) This test is a simple test to determine the impact of a drop that may be experienced due to rough handling. This test can also be used to verify the strength level of the equipment.
Test Ed: Repeated free fall GB/T2424.8-1995 method II (IEC68-2-32 method II) This test simulates the impact of repeated impacts that certain component-type products, such as connectors in use, may be subjected to. Test Ee: Bounce test method GB2423.39-90 (IEC68-2-55) This test simulates the random impact that bulk goods loaded on wheeled vehicles may be subjected to when transported on irregular roads. Impact and collision tests are carried out with the sample fixed on the test bench. The samples are in a free state in the tipping and overturning, free fall, repeated free fall and bounce tests. A3 Test severity level selection (according to 3.2.1.1, 3.2.2.1 and 4.2e, f, g) The compiler of the relevant specification intending to adopt this test should refer to 4.2 to ensure that all the requirements of 4.2 can be given in the relevant specification.
GB/T 2423.7-1995
-Distance between the bottom edge of the sample and the test table surface α-Angle between the bottom surface of the sample and the test table surface Figure A1 Flat drop
h-Distance between the bottom edge of the sample and the test table surface α=Angle between the bottom surface of the sample and the test table surface Figure A2 Angular drop
GB/T 2423.7—1995
Figure A3 Overturn
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