GB/T 2423.5-1995 English PDF (GBT2423.5-1995)

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GB/T 2423.5-1995: Environmental testing for electric and electronic products - Part 2: Test methods - Test Ea and guidance: Shock
GB/T 2423.5-1995
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
GB/T 2423.5-1995 / IDT IEC 68-2-27:1987
Replacing GB 2423.5-81
GB 2424.3-81
Environmental Testing for Electric and Electronic
Products - Part 2: Test Methods - Test Ea and
Guidance: Shock
APPROVED ON: AUGUST 29, 1995
IMPLEMENTED ON: AUGUST 01, 1996
Approved by: State Bureau of Technical Supervision
Table of Contents
Foreword ... 3
IEC Foreword ... 4
1 Objective ... 5
2 General Description ... 5
3. Definitions ... 6
4. Description of Test Apparatus ... 7
5. Severities ... 8
6 Pre-Conditioning ... 9
7 Initial Inspection ... 9
8 Conditional Test ... 9
9 Recovery ... 10
10 Final Inspection ... 10
11 Information to be Given in the Relevant Specification ... 10
Appendix A (Normative) Guidance ... 14
Appendix B (Normative) Shock Response Spectrum and Other
Characteristics of Pulse Waveform ... 21
Appendix C (Normative) Comparison among Collision Tests ... 31
Foreword
This Standard equivalently adopts the International Electrotechnical Commission
standard 3rd edition (1987) of IEC 68-2-27 “Environmental Testing – Part 2: Test
Methods – Test Ea and Guidance: Shock”.
This Standard replaced GB 2423.5-81 “Electric and Electronic Products - Basic
Environmental Test Regulations for Electricians - Test Ea: The Impact Method” and GB
2424.3-81 “Electric and Electronic Products - Basic Environmental Test Regulations
for Electricians – Guidelines for Impact Tests”.
GB 2423.5-81 and GB 2424.3-81 were drafted by reference of the International
Electrotechnical Commission standard 2rd edition (1972) of IEC 68-2-27 “Basic
Environmental Test Regulations – Part 2: Test Methods – Test Ea and Guidance:
Shock”; divided one standard of the International Electrotechnical Commission into two
standards; its text became the shock test methods in GB 2423.5; while its appendix
became the shock test guidance in GB 2424.3. This revision incorporates the test
methods and guidance; like the 3rd edition of IEC 68-2-27, add Clause 3 Definitions.
Increase the appendix from 1 to 3; namely, Appendix A: Guidance; Appendix B: Shock
Response Spectrum and Other Characteristics of the Pulse Waveform; Appendix C:
Comparison of Shock Test Methods. Relax restrictions for tolerance requirements of
pulse waveforms.
This Standard was first-time published in 1981; first-time revised in August, 1995. It is
implemented since the August 01, 1996.
The original China’s national standards of GB 2423.5-81 and GB 2424.3-81 were
abolished at the same time since the date of implementation.
This Standard’s Appendixes A, B and C are standard ones.
This Standard was proposed by the Ministry of Electronics Industry of the People’s
Republic of China.
This Standard shall be under the jurisdiction of National Technical Committee on
Environmental Conditions of Electric and Electronic Products and Environmental Test
of Standardization of China.
Drafting organization of this Standard: No. 5 Institute of Ministry of Electronics Industry.
Chief drafting staffs of this Standard: Xu Yongmei, and Wang Shurong.
Environmental Testing for Electric and Electronic
Products - Part 2: Test Methods - Test Ea and
Guidance: Shock
1 Objective
To provide a standard procedure for determining the ability of a specimen to withstand
specified severities of bump.
2 General Description
This Standard was drafted according to the pulse waveforms; refer to Appendix A for
guidance on selecting and using these pulse waveforms. The characteristics of various
pulse waveforms shall be discussed in Appendix B. This Standard includes three pulse
waveforms, namely, semi-sine pulse, post-peak zigzag pulse and trapezoidal pulse.
The selection of pulse waveform depends on many factors, and the selection itself is
difficult, therefore, this Standard does not give priority sequence of the waveforms (see
Clause A3).
The purpose of the test is to reveal mechanical weakness and/or performance
degradation; use these materials, and combine with relevant regulations to determine
whether a specimen is acceptable or not. It may also be used, in some cases, to
determine the structural integrity of specimens or as a means of quality control (see
Clause A2).
This test is primarily intended for unpackaged specimens and for items in their
transport case when the latter may be considered as part of the specimen itself.
The bumps are not intended to reproduce those encountered in practice. Wherever
possible, the test severity applied to the specimen and shock pulse waveforms should
be such as to reproduce the effects of the actual transport or operational environment
to which the specimen will be subjected to or to satisfy the design requirements if the
object of the test is to assess structural integrity (see Clauses A2 and A4).
For the purpose of this test the specimen is always fastened to the fixture or the table
of the bump tester during conditioning.
In order to facilitate the use of this Standard, the text of this Standard also listed the
geographical latitude. For the purposes of this Standard, the value of gn, is rounded up
to the integer of 10 m/s2.
4. Description of Test Apparatus
4.1 Characteristic requirements
When the bump tester and/or fixture are loaded with the specimen, the shock pulse
applied at the check point shall be approximate to the one of the nominal curves about
acceleration versus time shown in virtual line.
4.1.1 Basic pulse shape
The true value of the pulse shall be within the tolerance limit in the relevant Figures
shown in solid line.
NOTE - Where it is not practicable to achieve a pulse waveform falling within the specified
tolerance. The relevant specification should state the alternative procedure to be applied (see
Clause A5).
All specified pulse waveforms are as follows, and their order of arrangement does not
indicate that the front pulse is prioritized.
Post-peak zigzag pulse: an asymmetrical triangle with a short fall time, as shown in
Figure1.
Half-sine pulse: half cycle of a sine wave, as shown in Figure 2.
Trapezoidal pulse: a symmetrical quadrilateral with short rise and fall time, as shown
in Figure 3.
4.1.2 Speed variation tolerance
For all pulse waveforms, the actual speed variation shall be within ±15% of its
corresponding nominal pulse value.
When the speed variation is determined by the integral of the actual pulse, it shall be
begun from pre-pulse 0.4D integral to post-pulse 0.1D, where D is the duration of the
nominal pulse.
NOTE: If the speed variation tolerance is not available due to lack of an accurate integration
device, the relevant specification should state the alternative procedure to be applied.
4.1.3 Transverse motion
The positive or negative peak acceleration at the check point, perpendicular to the
intended bump direction, shall not exceed 30% of the value of the peak acceleration
of the nominal pulse in the intended direction, when determined with a measuring
system in accordance with Sub-clause 4.2 (see Clause A5).
NOTE – If the transverse motion tolerance cannot be achieved, the relevant specification
should state the alternative procedure to be adopted (see Clause A5).
4.2 Measuring system
The frequency characteristics of the measuring system shall be such that it can be
determined that the true value of the actual pulse as measured in the intended direction
at the check point is within the tolerance range in the ...