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GB/T 2423.55-2006 PDF in English


GB/T 2423.55-2006 (GB/T2423.55-2006, GBT 2423.55-2006, GBT2423.55-2006)
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GB/T 2423.55-2006: PDF in English (GBT 2423.55-2006)

GB/T 2423.55-2006
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.040
K 04
GB/T 2423.55-2006 / IEC 60068-2-75:1997
Environmental testing for electric and electronic products -
Part 2: Test methods - Test Eh: Hammer tests
(IEC 60068-2-75:1997, Environmental testing – Part 2: Tests – Test Eh:
Hammer tests, IDT)
ISSUED ON: FEBRUARY 15, 2006
IMPLEMENTED ON: JUNE 01, 2006
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 4 
Introduction ... 6 
1 Scope ... 7 
2 Normative references ... 7 
3 Provisions common to all hammer test methods ... 8 
3.1 Definitions ... 8 
3.2 Severities... 8 
3.3 Test apparatus ... 8 
3.4 Preconditioning ... 10 
3.5 Initial measurements ... 10 
3.6 Testing ... 10 
3.7 Recovery ... 11 
3.8 Final measurements ... 11 
3.9 Information to be given in the relevant specification ... 11 
4 Test Eha: Pendulum hammer ... 12 
4.1 Definitions ... 12 
4.2 Test apparatus ... 12 
4.3 Height of fall ... 13 
4.4 Testing ... 13 
5 Test Ehb: Spring hammer ... 14 
5.1 Test apparatus ... 14 
5.2 Influence of earth's gravity ... 15 
5.3 Calibration ... 16 
6 Test Ehc: Vertical hammer ... 16 
6.1 Definition ... 16 
6.2 Test apparatus ... 16 
6.3 Height of fall ... 16 
Annex A (normative) Shapes of striking elements ... 17 
Annex B (normative) Procedure for the calibration of spring hammers ... 20 
B.1 Principle of calibration ... 20 
B.2 Construction of the calibration device ... 20 
B.3 Method of calibration of the calibration device ... 20 
B.4 Use of the calibration device ... 22 
Annex C (informative) Guide ... 27 
C.1 When is an impact test appropriate? ... 27 
C.2 Choice of the test apparatus ... 27 
C.3 Choice of the energy level ... 27 
C.4 Information for testing ... 28 
Annex D (informative) Example of pendulum hammer test apparatus ... 29 
Annex E (informative) Kinetic energy (E) just before impact ... 33 
Foreword
GB/T 2423 “Environmental testing for electric and electronic products - Part 2: Test
methods” is divided into several parts according to the test methods.
This part is Part 55 of GB/T 2423.
This part is identical to IEC 60068-2-75:1997 “Environmental testing – Part 2: Tests –
Test Eh: Hammer tests” (English version).
This part is the first edition (IEC 60068-2-75 is the first edition).
This part is equivalent to IEC 60068-2-75, which is determined by IEC Guide 104 as
the basic safety standard.
This part is equivalent to IEC 60068-2-75, which is determined by IEC Guide 108 as
the basic environmental testing standard to be published.
For convenience of use, this Part makes the following editorial changes:
a) Change the word “this part of IEC 60068” to “this part of GB/T 2423” or “this
part”;
b) Use the decimal point “.” to replace the comma “,” as a decimal point;
c) Delete the foreword of the international standard;
d) Change this part to the current name, in order to be consistent with the names of
other parts of the existing GB/T 2423;
e) There is a 5-year lag between this part and the publication of the first edition of
IEC 60068-2-75 in the process of national standard conversion. The 5-year
transitional period was lost. For ease of use, add the version number and
publication date to the statement “Remove the values in brackets 5 years after the
publication of the first edition of IEC 60068-2-75: 1997 in August 1997”, and
keep it consistent with the original text.
Some of the normative documents cited in this part have not yet been converted into
equivalent national standards, and are still listed with IEC/ISO numbers when these
normative documents are cited.
Annex A and Annex B of this part are normative annexes; Annex C, Annex D and Annex
E are informative annexes.
This part is proposed by the Fifth Institute of Electronics, Ministry of Information
Industry.
Environmental testing for electric and electronic products -
Part 2: Test methods - Test Eh: Hammer tests
1 Scope
This part of GB/T 2423 provides three equivalent test methods for impacting the sample
under the specified severity conditions including the number of impacts, energy and
direction of impact. It applies to the assessment of the robustness of the product
according to the electrical safety clause.
This part covers energy levels ranging from 0.14 joules (J) to 50 joules (J).
Three types of test apparatus are applicable to perform these tests. Annex C provides
some guidance as to this aspect.
2 Normative references
The following normative documents contain provisions which, through reference in this
text, constitute provisions of this part. For dated references, all subsequent amendments
(not including errata content) or revisions do not apply to this part. Parties to agreements
based on this part should investigate the possibility of applying the most recent editions
of the standards listed below. For undated references, the latest edition applies to this
part.
GB/T 2421-1999, Environmental testing for electric and electronic products - Part 1:
General and guidance (idt IEC 60068-1:1988)
GB/T 4796-2001, Classification of environmental conditions - Part 1:
Environmental parameters and their severities (idt IEC 60721-1: 1990, Amendment
1, 1992)
ISO 1052: 1982, Steels for general engineering purposes
ISO 2039-2: 1987, Plastics - Determination of hardness - Part 2: Rockwell hardness
ISO 2041: 1990, Vibration and shock - Vocabulary
ISO 2768-1: 1989, General tolerances - Part 1: Tolerances for linear and angular
dimensions without individual tolerances indicated
ISO 6508: 1986, Metallic materials - Hardness test - Rockwell test (scales A-B-C-
D-E-F-G-H-K)
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.