IEC 60068-2-65
Edition 2.0 2013-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-65: Tests – Test Fg: Vibration – Acoustically induced method
Essais d’environnement –
Partie 2-65: Essais – Essai Fg: Vibrations – Méthode induite acoustiquement
IEC 60068-2-65:2013
®
IEC 60068-2-65
Edition 2.0 2013-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-65: Tests – Test Fg: Vibration – Acoustically induced method
Essais d’environnement –
Partie 2-65: Essais – Essai Fg: Vibrations – Méthode induite acoustiquement
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
V
ICS 19.040; 29.020
PRICE CODE
CODE PRIX
ISBN 978-2-83220-641-6
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
®
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
– 2 – 60068-2-65 © IEC:2013
CONTENTS
FOREWORD ........................................................................................................................... 4
INTRODUCTION ..................................................................................................................... 6
1 Scope ............................................................................................................................... 7
2 Normative references ........................................................................................................ 7
3 Terms, definitions, symbols and abbreviations................................................................... 7
3.1 Terms and definitions .............................................................................................. 7
3.2 Symbols and abbreviations .................................................................................... 11
4 Acoustic environments and requirements for testing ........................................................ 11
4.1 Acoustic environment for testing ............................................................................ 11
4.1.1 General ..................................................................................................... 11
4.1.2 Reverberant field ....................................................................................... 13
4.1.3 Progressive wave field ............................................................................... 14
4.1.4 Cavity resonance ....................................................................................... 14
4.1.5 Standing wave ........................................................................................... 14
4.2 Sound sources ....................................................................................................... 14
4.3 Measuring apparatus ............................................................................................. 14
4.3.1 General ..................................................................................................... 14
4.3.2 Acoustic measurements ............................................................................. 14
4.3.3 Vibration response measurements ............................................................. 15
4.3.4 Analysis of results ...................................................................................... 15
4.4 Requirements for testing ........................................................................................ 15
4.4.1 Type of facility ........................................................................................... 15
4.4.2 Mounting .................................................................................................... 15
4.4.3 Specimen instrumentation .......................................................................... 16
4.4.4 Preparation of test control .......................................................................... 17
5 Recommended severities ................................................................................................ 18
6 Preconditioning ............................................................................................................... 18
7 Initial measurements ....................................................................................................... 19
8 Testing ........................................................................................................................... 19
8.1 Normal testing ....................................................................................................... 19
8.2 Accelerated testing ................................................................................................ 19
9 Intermediate measurements ............................................................................................ 19
10 Recovery ........................................................................................................................ 19
11 Final measurements ....................................................................................................... 19
12 Information to be given in the relevant specification ......................................................... 20
13 Information to be given in the test report ......................................................................... 20
Annex A (informative) Guidance for the test requirements..................................................... 22
Bibliography .......................................................................................................................... 30
Figure 1 – Third-octave band spectrum for aeronautical applications ..................................... 12
Figure 2 – Octave band spectra for fans derived from [4] ....................................................... 13
Figure 3 – Octave band spectrum for noisy industrial machinery derived from [4] ................... 13
Figure 4 – Typical locations of microphone checkpoints (1 – 6) on a fictitious surface
around a specimen ................................................................................................................ 17
60068-2-65 © IEC:2013 – 3 –
Figure A.1 – Typical microphone arrangement around a specimen in a reverberation
chamber................................................................................................................................ 22
Figure A.2 – Typical microphone checkpoint arrangement around a long cylindrical
specimen .............................................................................................................................. 25
Table 1 – Tolerances for acoustic measurement .................................................................... 14
Table 2 – Overall sound pressure level and duration of exposure ........................................... 18
Table A.1 – Octave band/room volume relationship ............................................................... 23
Table A.2 – Reverberation room, ratios of dimensions ........................................................... 23
Table A.3 – Examples of sound sources with waveforms and typical power outputs................ 28
Table A.4 – Typical OASPL and exposure durations .............................................................. 28
– 4 – 60068-2-65 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 2-65: Tests –
Test Fg: Vibration –
Acoustically induced method
FOREWORD
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International Standard IEC 60068-2-65 has been prepared by IEC technical committee 104:
Environmental conditions, classification and methods of test.
This second edition cancels and replaces the second edition, published in 1993, and
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– minor technical and editorial changes were made throughout the document as originally
requested by the DE National Committee;
– following comments at the CD stage, particularly from the UK National Committee,
significant technical and editorial additions were made to the standard for acoustic testing
employing the progressive wave tube technique.
