IEC 60068-2-27
Edition 4.0 2008-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-27: Tests – Test Ea and guidance: Shock
Essais d'environnement –
Partie 2-27: Essais – Essai Ea et guide: Chocs
IEC 60068-2-27:2008
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE S
É
CURIT
É
IEC 60068-2-27
Edition 4.0 2008-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-27: Tests – Test Ea and guidance: Shock
Essais d'environnement –
Partie 2-27: Essais – Essai Ea et guide: Chocs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
W
ICS 19.040
PRICE CODE
CODE PRIX
ISBN 2-8318-9628-2
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE S
É
CURIT
É
– 2 – 60068-2-27 © IEC:2008
CONTENTS
FOREWORD...........................................................................................................................4
INTRODUCTION.....................................................................................................................6
1
Scope...............................................................................................................................7
2 Normative references........................................................................................................7
3 Terms and definitions .......................................................................................................8
4 Description of test apparatus ............................................................................................9
4.1 Required characteristics ..........................................................................................9
4.2 Measuring system..................................................................................................11
4.3 Mounting ...............................................................................................................12
5 Severities .......................................................................................................................13
6 Preconditioning...............................................................................................................14
7 Initial measurements and functional performance test .....................................................15
8 Testing ...........................................................................................................................15
9 Recovery ........................................................................................................................15
10 Final measurements .......................................................................................................15
11 Information to be given in the relevant specification.........................................................15
12 Information to be given in the test report .........................................................................16
Annex A (normative) Selection and application of pulse shapes – Guidance..........................17
Annex B (informative) Shock response spectra and other characteristics of pulse
shapes..................................................................................................................................27
Annex C (informative) Comparison between impact tests......................................................36
Bibliography..........................................................................................................................37
Figure 1 – Pulse shape and limits of tolerance for half-sine pulse ..........................................10
Figure 2 – Pulse shape and limits of tolerance for final-peak saw-tooth pulse.........................10
Figure 3 – Pulse shape and limits of tolerance for trapezoidal pulse.......................................11
Figure 4 – Frequency characteristics of the overall measuring system ...................................12
Figure A.1 – Shock response spectrum of a symmetrical half-sine pulse................................19
Figure A.2 – Shock response spectrum of a final-peak saw-tooth pulse .................................20
Figure A.3 – Shock response spectrum of a symmetrical trapezoidal pulse ............................21
Figure B.1 – Framework or box containing oscillatory systems of which f
1
, f
2
and f
3
are
examples of resonance frequencies ......................................................................................27
Figure B.2a – Exciting pulse ..................................................................................................29
Figure B.2b – Responses for f
1
, f
2
and f
3
...............................................................................29
Figure B.2c – Spectra which result from an infinite number of frequencies, with f
1
, f
2
and
f
3
shown as finite points on the continuous curves.................................................................29
Figure B.2 – Shock response spectrum concept ....................................................................29
Figure B.3 – Framework containing damped multi-degree-of-freedom system ........................31
Figure B.4 – Shock response spectrum of a half-sine pulse with ripple..................................33
60068-2-27 © IEC:2008 – 3 –
Figure B.5 – Spectrum of a final-peak saw-tooth 300 m/s
2
, 18 ms pulse compared with
the spectra of 200 m/s
2
half-sine pulses with durations between 3 ms and 20 ms ..................35
Table 1 – Severities for shock testing ....................................................................................14
Table A.1 – Examples of pulse shapes and test severities typically employed for various
applications...........................................................................................................................23
Table A.2 – Examples of severities typically employed for various applications ......................24
– 4 – 60068-2-27 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 2-27: Tests – Test Ea and guidance: Shock
FOREWORD
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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International Standard IEC 60068-2-27 has been prepared by IEC technical committee 104:
Environmental conditions, classification and methods of test
This fourth edition cancels and replaces the third edition, published in 1987, and includes the
merging of IEC 60068-2-29, second edition (1987). It constitutes a technical revision.
The major changes with regard to the previous edition concern:
− the merging of IEC 60068-2-29 into this edition of IEC 60068-2-27; Part 2-29 will be
withdrawn as soon as this edition is published;
− the introduction of soft packaged specimens as defined in the IEC ad hoc working group
document agreed in Stockholm:2000.
