GB/T 2423.6-1995 Environmental testing for electric and electronic products Part 2: Test methods Test Eb and guidance: Bump
Some standard content:
GB/T2423.6-1995
This standard is equivalent to the International Electrotechnical Commission standard IFC68-2-29 (second edition in 1987) "Environmental testing Part 2: Test method Test Eb and guidance: collision".
In this way, this national standard is the same as the international standard to meet the needs of international trade, technology and economic exchanges. This standard replaces GB2423.6--81 "Basic environmental testing procedures for electric and electronic products Test Eh: collision test method" and GB2424.4--81 "Basic environmental testing procedures for electric and electronic products Bump test guide". GB2423.6-81 and GB2424.4--81 were drafted with reference to IEC68-2-29 (first edition in 1968) "Basic environmental testing procedures Part 2: Test Test Eb: collision". In addition to the differences in content and text arrangement, the main differences between the two are: adding three levels of severity: 50m/s216ms; 50m/s, 11ms; 100m/s2, 11ms; - dividing the text and appendix of the IEC68-2-29 standard into two standards: "Magnetic Impact Test Method" and "Collision Test Guidelines". - adding test requirements for test samples with completely symmetrical structure and performance. This standard is completely the same as the second edition of IFC68-2-29 (1987) in terms of technical content, writing format and rules. The main differences between this standard and the previous version are:
Added the introduction;
··Added Chapter 3 Definitions;
The pulse waveform and tolerance of the collision test were modified; The frequency characteristics of the measurement system were modified;..
-In the severity level, the three levels of 50m/s\, 16ms50m/s, 11ms; 100m/s\, 11ms were deleted, and the two levels of 150m/s, 6ms; 1000m/s2, 2ms were added; The number of collisions and test methods were also modified; The original appendix was divided into two appendices, namely Appendix A and Appendix B, and the content was also supplemented and revised. This standard is compiled in accordance with GB/T1.1-93 "Guidelines for Standardization Work Unit 1: Drafting and Expression Rules of Standards Part 1: Basic Regulations for Standard Compilation", retaining the foreword of the international standard and adding the "National Foreword". The following four standards and this standard are all in the category of impact test. The relevant specifications should select appropriate test methods according to the specific conditions of product use and transportation (see Appendix B).
-GB3/T2423.5-1995 Environmental testing for electric and electronic products Part 2: Test method Test Ea and guidance: Impact;--GB/T2423.7-1995 Environmental testing for electric and electronic products Part 2: Test method Test Ec and guidance: Tipping and overturning (mainly used for equipment type samples);-GB/T2423.8-1995 Environmental testing for electric and electronic products Part 2: Test method Test Ed: Drop from the middle; GB2423.39-90 Basic environmental testing procedures for electric and electronic products Test Ec: Bounce test method. Appendix A of this standard is the standard appendix;
Appendix B of this standard is the indicative appendix.
This standard is proposed by the Ministry of Electric Industry of the People's Republic of China. This standard is issued by the National Technical Committee for Standardization of Environmental Conditions and Environmental Tests for Electrical and Electronic Products 11. The drafting unit of this standard is the Standardization Office of the Seventh Institute of China State Shipbuilding Corporation. The main drafters of this standard are Huang Shufu, Sheng Zuyao, Chen Henian, Jin Baogen, Xu Yi, and Wang Shurong. 327
GB/T2423.6---1995
IEC Preface
1) The formal resolutions or agreements of the International Electrotechnical Commission (IEC) on technical issues are formulated by technical committees represented by national committees that are particularly concerned about the issue. They express the international consensus on the issue as much as possible. 2) These resolutions or agreements are in the form of recommended standards for international use and are accepted by national committees in this sense. 3) In order to promote international unification, the International Electrotechnical Commission hopes that all national committees should adopt IEC recommended standards as their national standards when their national conditions permit. Any differences between IEC recommended standards and corresponding national standards should be clearly stated in the national standards as much as possible.
This standard was developed by IEC Technical Committee 50A (Shock and Vibration Testing) of IEC Technical Committee 50 (Environmental Testing). The second edition of IEC68-2-29 published this time replaces the first edition issued in 1968. During this period, the first revision was made in 1982 and the second revision was made in 1983.
This standard is based on the following documents: Draft Standard
50A (Central Office) 163
50A (Central Office) 171
For more detailed information, please refer to the voting reports listed in the above table. This standard refers to the following IEC standards:
68-1 (1982): Basic Environmental Testing Procedures Part 1: General Principles and Guidelines 68-2: Basic Environmental Testing Procedures Part 2: Tests 68-2-27 (1986): Test Ea and Guidelines: Impact 682-31 (1969): Test Ec: Tipping and Overturning (mainly for equipment-type samples) 68-2-32 (1975): Test Fd: Free Fall Voting Report
50A (Central Office) 170
5 0A (Central Office) 174
68-2-47 (1982): Installation and guidance for components, equipment and other products in tests such as impact (Ea), collision (Eb), vibration (Fc and Fa) and steady-state acceleration (Ga)
682.55: Test Ee and guidance: Bounce
721-31: Part 3: Classification of environmental parameters and their severity classification Storage 721-3-5 (1985) Part 3: Classification of environmental parameters and their severity classification Other referenced standards for ground vehicles: IS) 2041 (1975): Vibration and impulse meter terminology 328
National Standard of the People's Republic of China
Environmental testing for electrical and electronic products
Part 2: Test methods
Test Eb and guidance: Collision
Environmental testing for electric and electronic productsPart 2:Test methods
Test Eb and guidance: Bump
GB/T2423.6..1995
idt IEC 68-2-29: 1987
81
This test is applicable to components, equipment and other electrical and electronic products (hereinafter referred to as samples) that may be subjected to repeated impacts during transportation or use. The collision test can also be used as a method to determine the satisfactory design of the sample in terms of structural strength, or as a means of quality control. The collision test basically consists in subjecting the sample to repeated impacts of standard pulses with specified peak acceleration and duration on a crash tester.
Note: The term "crash tester" is used throughout this standard, but it does not exclude other methods of applying collisions. The writers of the relevant specifications will be informed of what to give in the specifications in Chapter 11 and the necessary guidance will be given in Appendix A. 1 This standard
provides a standard test method for determining the ability of a sample to withstand a specified severity level of collision. 2 General remarks
This standard is written based on the requirements of using half-sine pulses with specified peak acceleration and duration, and a specified number of repetitions. The purpose of this test is to determine the cumulative damage or the degradation of the specified performance caused by repeated impacts, and then use this information in combination with the actual specifications to decide whether the product is accepted. In some cases, this test can also be used to determine the structural goodness of the sample or as a means of quality control (see Chapter A3). This test is mainly for non-packaged samples, and samples whose packaging can be regarded as part of the product itself in the transport box. The collision test is not used to reproduce the collision experienced in reality. When possible, the test severity level applied to the sample should be able to simulate the collision effect experienced in actual transportation and working environment. If the purpose of the test is to evaluate the structural goodness, the design requirements must be met (see Chapter A3).
During the conditional test, the sample should always be fastened to the clamp and/or collision test machine. For use, the main body of this standard lists the items in Appendix A to be referred to, and the items in the main body are also included in Appendix A.For reference.
This standard should be used together with GB242189 "General Rules for Basic Environmental Test Procedures for Electrical and Electronic Products". 3 Definitions
The terms used in this standard are based on the provisions of GB/T2298 "Terms for Mechanical Vibration and Shock". For the purpose of this standard, the following additional terms are also used: Approved by the State Administration of Technical Supervision on August 29, 1995 and implemented on August 1, 1996
3.1 Fixing point
GB/T2423.6—1995
The part of the sample and the fixture or in contact with the table of the collision test machine. This is usually the place where the sample is fixed in use. 3.2 Test point
The fixed point closest to the center of the table of the collision test machine. When there is a fixed point with a better rigid connection to the table of the collision test machine, this point should be used as the test point.
Note: This term is applicable to the case where there is only one designated test point. GB2423 "Environmental testing for electrical and electronic products" and other standards use more than one test point to control the test.
3.3 Bump severity The severity of the bump test consists of peak acceleration, nominal pulse duration and number of collisions. 3.4 Velocity change The absolute value of the sudden change in velocity caused by the application of the specified acceleration. If the velocity change occurs in a shorter time than the basic period of the excitation pulse involved, such a change is generally considered to be sudden. 3.5 Standard acceleration gm
The standard acceleration caused by the earth's gravity, which varies with altitude and geographical location. For the purpose of this standard, the value of g is taken as 10 m/s\
4 Test equipment description
4.1 Characteristics requirements
When the sample is installed on the bump test machine and (or) fixture, the collision applied at the test point should have the following characteristics. 4.1.1 Basic pulse waveform
The true value of each"·half-sine pulse should be within the tolerance range shown by the solid line in Figure 1. Note: When a pulse waveform that falls within the specified tolerance range cannot be obtained, the relevant specification should specify another method that can be used (see Chapter A4). Integration time
--Nominal pulse line tolerance range line; D--Nominal pulse duration; A--Nominal pulse peak acceleration; When a collision is generated by a conventional collision tester, the shortest time for monitoring the pulse should be: T
T When a collision is generated by an electric vibration table, the shortest time for monitoring the pulse should be Figure 1 Pulse waveform of collision test (half-sine) 4.1.2 Repetition frequency
The repetition frequency should make the secondary collision The relative motion inside the sample between collisions is basically the same. And the acceleration value at the test point should be within the limit of 330
shown in Figure 1 (see Chapter A6).
GB/T2423.6---1995
Note: A rate of 1 to 3 collisions per second is usually appropriate. 4.1.3 Velocity change tolerance
The actual velocity change should be within ±20% of the corresponding nominal pulse value. When the velocity change is determined by the integration of the actual pulse, it should be integrated from 0.4D before the pulse to (.11) after the pulse. Here 1) is the duration of the nominal pulse.
Note: If the velocity change tolerance cannot be obtained due to the lack of accurate equipment, the relevant specifications An alternative method should be specified (see Chapter A4, Chapter A5). 4.1.4 Lateral motion bzxz.net
At the test point, the positive or negative peak acceleration perpendicular to the predetermined direction should not exceed 30% of the nominal pulse peak acceleration in the predetermined direction. The ear measurement system should comply with 4.2 (see the provisions of Chapter A4). Note: If the tolerance for lateral motion cannot be achieved, the relevant specifications should specify an alternative method (see Chapter A4). 4.2 Measurement system
The characteristics of the measurement system should be able to determine that the true value of the actual pulse measured in the predetermined direction of the test point is within the tolerance required by 4.1.1.
The frequency response of the entire measurement system, including the accelerometer, has an impact on the measurement accuracy. The influence of the pulse width is obvious, so the frequency response of the whole measurement system is within the limits shown in Figure 2 (see Chapter A4). dB
24dB/oct
Pulse duration
4.3 Installation
Low cut-off frequency
High cut-off frequency
Frequency characteristics of the measurement system
Frequency response exceeding +1dB
During the conditional test, the sample shall be fixed to the table of the impact test machine by means of a fixture or directly according to its normal installation method. The installation requirements are specified in GB/T2423.43-1995 "Environmental testing for electrical and electronic products Part 2: Test methods for components, equipment and other products Note 331
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Installation requirements and guidelines for dynamic tests such as shock (Ea), collision (Eb), vibration (Fc and Fd) and steady-state acceleration (Ga)". 5 Severity level
The relevant specifications shall specify the appropriate severity level of collision. Unless otherwise specified, the group acceleration and duration in the same row in Table 1 of 5.1 shall be selected, and the number of collisions shall be selected from 5.2 (see Chapter A3). 5.1 Pulse acceleration and duration
Table 1
Pulse acceleration and duration
Peak acceleration A
100(10)
150(15)
250（25)
100(40)
1000(100)
5.2 Number of collisions in each direction
100±5;
1000±10;
4 000±10.
6 Pretreatment
The relevant specifications may put forward pretreatment requirements. 7 Initial test
Corresponding nominal pulse duration D
Perform appearance, dimensional and functional tests on the samples in accordance with the provisions of the relevant specifications. 8 Conditional test
8.1 Application of impact
8.1.1 Component type sample
Corresponding velocity change AV
Unless otherwise specified in the relevant specifications, the specified number of impacts shall be applied in each direction of the two mutually perpendicular axes of the sample. When testing a number of identical samples, they can be properly oriented and installed so that the sample can withstand the impacts in the above-mentioned axes and directions at the same time (see Chapter A6).
8.1.2 Equipment type sample
If the use and transportation installation posture of the sample is known, and since the impact is usually most significant in one direction of an axis (usually the vertical direction), the specified number of impacts shall only be applied in that direction and posture. If the use and transportation installation posture of the sample is unknown, the specified number of impacts shall be applied in each direction in accordance with the provisions of the relevant specifications (see Chapter A6). 8.2 Mode of operation and function monitoring
The relevant specification shall specify:
a) whether the sample is to be operated and function monitored during the magnetic impact test; and (or) b) whether it is to withstand the impact.
For the above two situations, the relevant specification shall give the criteria for acceptance or rejection. 332
9 Recovery
The relevant specification may put forward recovery requirements.
10 Final inspection
GB/T 2423.6
The sample shall be inspected for appearance, size and function in accordance with the provisions of the relevant specification. The relevant specification shall give the criteria for acceptance or rejection. 11 Contents to be given in the relevant specifications
When the relevant specifications adopt this test, the following details should be given: a) Tolerances in special cases (see 4.1.1, Chapter A4); b) Speed changes in special cases (see 4.1.3, Chapter A5); c) Lateral movement in special cases (see 4.1.4); d) Installation method (see 4.3);
e) Severity level (see 5.1, 5.2, Chapter A3); f) Pretreatment (see Chapter 6);
g) Initial detection (see Chapter 7);
h) Direction and number of collisions only in special cases (see 8.1, Chapter A6); 1) Working mode and function monitoring (see 8.2); j) Criteria for acceptance and rejection (see 8.2, Chapter 10); k) Recovery (see Chapter 9);
1) Final measurement (see Chapter 10).
A1 Introduction
GB/T 2423.6---1995
Appendix A
(Standard Appendix)
This test provides a method for simulating the effects of actual environments in the laboratory. The effects produced on the specimens are comparable to those to which the product is actually subjected during transportation and operation. The basic purpose of this test is not to reproduce the actual environment. In order to obtain consistent results when tested by different people in different laboratories, the parameters given in this test are standardized and appropriate tolerances are given. The standardization of the values enables components to be classified according to their ability to withstand the test severity levels given in this standard.
For ease of use, this appendix lists the relevant item numbers of the standard text. Applicability of A2 Test
This test is intended to simulate the effects produced on specimens used and transported in vehicles used in land transportation: The complex impacts and bumps produced by land transportation are usually severe and have a complex and random nature at different time periods, depending on the length of the route, the condition of the road surface, the type of truck and trailer, etc. Repetitive collisions during railway transportation are mainly caused by the irregularities of the rails and are of medium intensity. Shunting, hooking, etc. of railway vehicles can also produce stronger collisions. For non-repetitive collisions, it is more appropriate to use (B/T2423.5:1995 "Environmental testing of electrical products Part 2: Test method Test Ea and guidance: Impact" (see Appendix B). The collision test is applicable to samples installed on vehicles for use and transportation. The placement status of samples during transportation is divided into two situations: compact and bulk. For samples transported in bulk, another test should be considered, namely GB2423.39-90 "Basic environmental testing procedures for electrical products Test Ee: Bounce test method" (see Appendix 3). The collision test is carried out by fixing the sample to the collision machine table through a clamp or directly rigidly, so that it is transformed to the selected impact pulse input from the continuous contact point.
All specification writers who use this test should refer to Chapter 11 "Related specifications "The content that should be given" should ensure that regulations are made for the details of these contents.
A3 Test severity level
The test severity level applied to the sample should be related to the environment to which the sample is subjected during its transportation or use, if possible. If the purpose of the test is to evaluate the structural integrity of the sample, the test severity level should meet the design requirements. The transportation environment is often more severe than the working environment. In this case, the selected test severity level needs to be consistent with the transportation environment. The sample must always withstand the transportation environment. If the sample needs to operate in a working environment, it is necessary not only to carry out a collision test according to the requirements of the selected environmental conditions, but also to carry out a collision test according to the requirements of the working environment conditions. When conducting the former test, only the energy detection is required on the test material; when conducting the latter During the test, functional testing is required. When determining the test severity level to be used, it is necessary to consider the appropriate margin between the test severity level and the actual environment. When the actual operation and transportation environment is unknown, the appropriate severity level should be selected from Table A1. This table gives test severity levels that are widely applicable to various transportation and use environments. The severity levels given in the table for various applications are not mandatory and are typical. It must be pointed out that there are actually situations where the severity level experienced is different from the values given in Table A1. It should be emphasized that the alkali impact test is an empirical test and a test that gives a certain confidence in strength. It is not a test that accurately simulates the real environment.
When determining the test severity level, the compilers of the relevant specifications should consider Considering the relevant contents of GI34796 "Environmental parameters and precision classification of electrical and electronic products" and the relevant provisions of G34798.1 "Environmental conditions for the application of electrical and electronic products: storage" (GB/T2423.6-1995), it should be remembered that the above standards list the impact values experienced in practice, while this standard standardizes the impact pulse in order to produce tests that are as consistent as possible with the effects caused during actual use.
A4 Tolerances
When the tolerances for pulse waveform, velocity change, repetition frequency and lateral movement meet the requirements, the method described in this standard has high reproducibility.
However, for samples with high applied loads, that is, samples whose mass and (or) dynamic characteristics affect the characteristics of the collision test machine, these tolerances may not meet the requirements of this standard. In this case, it is expected that the relevant specifications will relax the provisions for wear or record the actual tolerances obtained in the test report (see 4.1.1, 4.1.3, 1.1.4). When testing samples with high reaction loads, pre-adjustment must be carried out to check the characteristics of the collision table after the load is installed. For complex samples, since there may be only one or a limited number of samples available for testing, repeated collisions before the formal test, especially for tests with a small number of collisions, may lead to over-testing or unrepresentative cumulative damage. In this case, it is recommended to use a representative sample (such as a non-conforming sample) if possible. When such a sample is not available, a model with accurate mass and center of gravity position must be used to select a collision pre-adjustment check. However, it must be pointed out that such a model cannot have exactly the same dynamic response as the real sample. If a low-pass filter is used, its cut-off frequency should be selected so that the distortion of the basic pulse can be ignored. The potential damage to the high-frequency response is determined by other methods mentioned above, such as vibration testing. Figure 2 shows the frequency response of the measurement system with filtering requirements. The cut-off frequency (-3dB point) of the filter shall not be less than: =1.5/D
Wu Zhong: .-cut-off frequency, kHz;
D---pulse duration, ms.
The frequency response of the entire measurement system including the accelerometer is an important factor in achieving the required pulse waveform and severity level, and therefore needs to be within the tolerance range shown in Figure 2. In order to reduce the influence of the high-pass resonance inherent in the accelerometer, a low-pass filter must be used. In order to avoid waveform distortion through the measurement system, the amplitude characteristics and phase characteristics of the measurement system must be considered (see 4.2). A5 Velocity change (see 4.1.3)
For this test, the actual velocity change must be determined. There are many ways to determine the velocity change, including: -. For pulses that do not cause projectile motion, it is determined by the impact velocity. It is determined by the integral of the acceleration-time curve. When the integration method is specified, unless otherwise specified, the actual velocity change shall be determined from the integral of 0.41D before the start of the pulse to 0.1D after the end of the pulse, where D is the nominal pulse duration. However, it must be noted that the use of electrical integration to determine the velocity change base may be difficult and requires the use of precise equipment, so the test cost should be considered before using this method. One purpose of specifying velocity changes and their corresponding tolerance requirements is to promote the test laboratory to achieve the same impact pulse as the nominal pulse, that is, the pulse is in the center of the tolerance band (see Figure 1), in which case the test can maintain high reproducibility. Another purpose of specifying velocity changes is related to the impact response spectrum, that is, when the normalized frequency fD) is 0.2 (I) is the resonant frequency of the impact response spectrum, I) is the pulse duration), the residual response spectrum is approximately proportional to the velocity change of the pulse. For more detailed information on this aspect, see Appendix B of G13/T2423.5-1995. A6 Condition Test (See 8.1)
The axis and direction selected for the test should represent as much as possible the axis and direction that the sample will encounter during transportation or use. Especially when testing components, the minimum number of collisions allowed to meet the requirements of the specification depends mainly on the number and mounting arrangement of the various samples used for the test. For example, if there are six samples available for testing, they can be mounted in six different directions, so that the requirements of the specification can be met by applying collisions in only one direction (. If there are three to five samples, collisions can be applied in only two directions! For 335
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mounted samples. Similarly, if there are two samples, collisions should be applied to the samples in three directions. For only one sample, collisions need to be applied in six directions (see 8.1.1). For equipment-type samples, they are always installed on their normal mounting base for use or transportation on the vehicle, so they only need to be subjected to collision tests when installed on this base. During transportation, samples that may have more than one mounting surface should be tested in each axis and direction specified in the relevant specification. According to test experience, it is usually sufficient to test in three mutually perpendicular directions (see 8.1.1.2). In order to ensure the reproducibility of the test, it is required that any relative movement inside the sample between two collisions is essentially zero. Otherwise, resonant re-excitation will occur at different stages of the sample resonance decay, resulting in different test results for the same sample. Note: In order to determine whether the above-mentioned conditions are met, the test engineer can use the following formula to calculate the highest repetition frequency. However, this formula is not intended for general use and should not be included in the specification. R fres min /10
Where R. Repetition frequency. times.;
frk min
Minimum resonance frequency, Hz.
When relative movement inside the sample cannot be observed, such as closed samples, the relevant specifications should indicate the measures to be taken. In many cases, especially for components, no measures are necessary (see 4.1.2) Table A1 Typical examples of severity levels of collision tests for various occasions Severity level
Peak acceleration
m/s* (g.)
100(10)
150(15)
250(25)
400(40)
400(40)
1000(100)
Duration
Number of
collisions in each specified direction
for components Minimum strength test for general purpose samples transported by road, excluding off-road transport, where the maximum mechanical loads occur during transport
for samples transported on non-portable equipment
|tt||Samples used on transport equipment
Bulbs and reed contact devices, such as telephones and switches
Basic strength test for equipment and equipment installed on non-off-road wheeled vehicles or fastened on the above vehicles for transportation
Equipment installed on fixed control equipment or in heavy mobile machinery
For example, products installed on heavy off-road vehicles near power plants for use in a reliable position
or transported in the above vehicles in a fastened state. Products installed on mechanical handling equipment, such as quay cranes, fork lifts. Products temporarily transported in bulk on wheeled vehicles (road or rail), such as deliveries. Products repeatedly transported in bulk on any type of road, rail or off-road vehicle. Note: For samples with a nominal mass less than 100kg, it is recommended to use only two test severity levels of 250m/s and 400m/s. For samples over 100kg, it is usually more appropriate to use the test severity level of 100m/s2. 336
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Appendix B
(Informative Appendix)
Comparison between impact tests
Test Ea and Guidelines: Shock (GB/T2423.5—1995, IEC68-227) This test simulates the effects of non-repetitive shocks that components and equipment may be subjected to during use and transportation. Test Eb and Guidelines: Collision (GB/T2423.6--1995.IEC68-2-29) This test simulates the effects of repetitive shocks that components and equipment may be subjected to during transportation or when installed in various types of vehicles.
Test Ec and Guidelines: Tipping and Overturning, mainly for equipment type samples (GB/T2423.7-1995, IEC68-2-31) This test is a simple test to simulate the knock or impact effects that equipment type samples may experience during maintenance work or due to rough handling on the workbench.
Test Ed: White Drop (GB/T2423.8--1995, IEC28-2-32 Method: Free Drop) This test is a simple test to simulate the drop effect that the product may experience due to rough handling. This test is also suitable for verifying the degree of product.
Test Ed: Repeated Free Drop (GB/T2423.8--1995, IEC68-2-32 Method 2: Repeated Free Drop) This test is used to simulate the effects of repeated impacts that certain component type samples, such as connectors in use, may experience. Test Fe: Bounce (GB2423.39--90.IEC68-2-55) This test simulates the effects of random impacts that a product may experience when it is transported as bulk cargo on a wheeled vehicle on an uneven road surface.
Impact and collision tests are conducted with the sample fixed on the test bench. For the tipping and overturning, free fall, repeated free fall and bounce tests, the sample is not fixed. 3378--1995, IEC28-2-32 Method: Free Fall) This test is a simple test to simulate the effect of a drop that a product may experience due to rough handling. This test is also suitable for verifying the degree of resistance of a product.
Test Ed: Repeated Free Fall (GB/T2423.8--1995, IEC68-2-32 Method II: Repeated Free Fall) This test is used to simulate the effects of repeated impacts that certain component type samples, such as connectors in use, may be subjected to. Test Fe: Bounce (GB2423.39--90. IEC68-2-55) This test simulates the effects of random impacts that a product may be subjected to when it is loaded as bulk cargo on a wheeled vehicle and transported on uneven roads.
Impact and collision tests are carried out with the sample fixed on the test bench. For the tipping and overturning, free fall, repeated free fall and bounce tests, the sample is not fixed. 3378--1995, IEC28-2-32 Method: Free Fall) This test is a simple test to simulate the effect of a drop that a product may experience due to rough handling. This test is also suitable for verifying the degree of resistance of a product.
Test Ed: Repeated Free Fall (GB/T2423.8--1995, IEC68-2-32 Method II: Repeated Free Fall) This test is used to simulate the effects of repeated impacts that certain component type samples, such as connectors in use, may be subjected to. Test Fe: Bounce (GB2423.39--90. IEC68-2-55) This test simulates the effects of random impacts that a product may be subjected to when it is loaded as bulk cargo on a wheeled vehicle and transported on uneven roads.
Impact and collision tests are carried out with the sample fixed on the test bench. For the tipping and overturning, free fall, repeated free fall and bounce tests, the sample is not fixed. 337
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