EN 60068-3-8:2003

Environmental testing - Part 3-8: Supporting documentation and guidance - Selecting amongst vibration tests

Provides guidance for selecting amongst the EN 60068-2 stationary vibration test methods Fc sinusoidal, Fh random and F(x) Mixed mode vibration. The different steady-state test methods and their aims are briefly described in Clause 4. Transient test methods are not included. For vibration testing, the environmental conditions, especially the dynamic conditions for the specimen, should be known. This standard helps to collect information about the environmental conditions (Clause 5), to estimate or measure the dynamic conditions (Clause 6) and gives examples to enable decisions to be made on the most applicable environmental vibration test method. Starting from the condition, the method of selecting the appropriate test is given. Since real life vibration conditions are dominated by vibration of a random nature, random testing should be the commonly used method, see Table 1, Clause 7. The methods included hereafter may be used to examine the vibration response of a specimen under test before, during and after vibration testing. The selection for the appropriate excitation method is described in Clause 8 and tabulated in Table 2. In this standard specification, writers will find information concerning vibration test methods and guidance for their selection. For guidance on test parameters, or severities of one of the test methods, reference should be made to the normative references. Has the status of a basic safety publication in accordance with IEC Guide 104.

Umweltprüfungen - Teil 3-8: Unterstützende Dokumentation und Leitfaden - Auswahl zwischen verschiedenen Schwingprüfverfahren

Essais d'environnement - Partie 3-8: Documentation d'accompagnement et lignes directrices - Sélection d'essais de vibrations

Fournit les lignes directrices pour la sélection parmi les méthodes d'essais Fc de vibrations stationnaires sinusoïdales, Fh aléatoires et Fx composites de la série 60068-2. Ces différentes méthodes d'essais quasi stationnaires ainsi que leur objet sont brièvement décrites à l'Article 4. Les méthodes d'essais en transitoire ne sont pas incluses. Lors de la réalisation d'essais en vibration, il convient de connaître les conditions d'environnement, et spécialement les conditions dynamiques du spécimen en essai. La présente norme aide à réunir l'information relative aux conditions d'environnement (Article 5), à estimer ou à mesurer les conditions dynamiques (Article 6) et donne des exemples afin d'illustrer les choix à réaliser pour la plupart des méthodes d'essais applicables en environnement vibratoire. A partir des conditions d'environnement, la méthodologie de choix de l'essai approprié est fournie. Puisque les conditions d'environnement vibratoire naturelles sont de nature aléatoire, il est recommandé que les essais en vibrations aléatoires soient généralement, les méthodes retenues (voir Tableau 1, Article 7). Les méthodes décrites ci-après peuvent être utilisées pour examiner la réponse vibratoire du spécimen en essai avant, pendant et après un essai de vibrations. Le choix de la méthode appropriée est décrit à l'Article 8 et présenté au Tableau 2. Les spécificateurs trouveront dans la présente norme les informations relatives aux méthodes d'essais vibratoires et les lignes directrices pour choisir parmi elles la méthode appropriée. Pour choisir les paramètres ou les sévérités relatives à l'une de ces méthodes, il y a lieu de se reporter aux références normatives. A le statut d'une publication fondamentale de sécurité conformément au Guide 104 de la CEI.

Environmental testing - Part 3-8: Supporting documentation and guidance - Selecting amongst vibration tests (IEC 60068-3-8:2003)

General Information

• Status: Published
• Publication Date: 20-Nov-2003
• Withdrawal Date: 31-Oct-2006
• ICS: 19.040 - Environmental testing
• ICS: 29.020 - Electrical engineering in general
• Technical Committee: CLC/SR 104 - Environmental conditions, classification and methods of test
• Drafting Committee: IEC/TC 104 - IEC_TC_104
• Parallel Committee: IEC/TC 104 - IEC_TC_104
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 21-Nov-2003
• Completion Date: 21-Nov-2003
• Ref Project: SIST EN 60068-3-8:2004 - Environmental testing -- Part 3-8: Supporting documentation and guidance - Selecting amongst vibration tests

Standards Content (Sample)

SLOVENSKI SIST EN 60068-3-8:2004

STANDARD
februar 2004
Environmental testing - Part 3-8: Supporting documentation and guidance -
Selecting amongst vibration tests (IEC 60068-3-8:2003)
ICS 19.040; 29.020 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 60068-3-8
NORME EUROPÉENNE
EUROPÄISCHE NORM November 2003

ICS 19.040; 29.020
English version
Environmental testing
Part 3-8: Supporting documentation and guidance –
Selecting amongst vibration tests
(IEC 60068-3-8:2003)
Essais d'environnement Umweltprüfungen
Partie 3-8: Documentation Teil 3-8: Unterstützende Dokumentation
d'accompagnement et lignes directrices - und Leitfaden –
Sélection d'essais de vibrations Auswahl zwischen verschiedenen
(CEI 60068-3-8:2003) Schwingprüfverfahren
(IEC 60068-3-8:2003)
This European Standard was approved by CENELEC on 2003-11-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60068-3-8:2003 E
Foreword
The text of document 104/308/FDIS, future edition 1 of IEC 60068-3-8, prepared by IEC TC 104,
Environmental conditions, classification and methods of test, was submitted to the IEC-CENELEC
parallel vote and was approved by CENELEC as EN 60068-3-8 on 2003-11-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2004-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2006-11-01

Annexes designated "normative" are part of the body of the standard.
In this standard, annex ZA is normative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60068-3-8:2003 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60721-3-0 NOTE Harmonized as HD 478.3.0 S1:1987 (not modified).

__________
- 3 - EN 60068-3-8:2003
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1) 2)
IEC 60068-1 - Environmental testing EN 60068-1 1994
Part 1: General and guidance
1) 2)
IEC 60068-2-6 - Part 2-6: Tests - Test Fc: Vibration EN 60068-2-6 1995
(sinusoidal)
1) 2)
IEC 60068-2-64 - Part 2-64: Test methods - Test Fh: EN 60068-2-64 1994
Vibration, broad-band random (digital
control) and guidance
3)
IEC 60068-2-80 - Part 2-80: Tests - Test Fi: Mixed mode - -

IEC 60721-3 Series Classification of environmental EN 60721-3 Series
conditions
Part 3: Classification of groups of
environmental parameters and their
severities
IEC 60721-4 Series Part 4: Guidance for the correlation and - -
transformation of environmental
condition classes of IEC 60721-3 to the
environmental tests of IEC 60068

IEC Guide 104 1997 The preparation of safety publications - -
and the use of basic safety publications
and group safety publications
1)
ISO 2041 - Vibration and shock - Vocabulary - -

1)
ISO 5348 - Mechanical vibration and shock - - -
Mechanical mounting of accelerometers

1)
Undated reference.
2)
Valid edition at date of issue.
3)
At draft stage.
NORME CEI
INTERNATIONALE IEC
60068-3-8
INTERNATIONAL
Première édition
STANDARD
First edition
2003-08
PUBLICATION FONDAMENTALE DE SÉCURITÉ
BASIC SAFETY PUBLICATION
Essais d'environnement –
Partie 3-8:
Documentation d'accompagnement
et lignes directrices –
Sélection d'essais de vibrations
Environmental testing –
Part 3-8:
Supporting documentation and guidance –
Selecting amongst vibration tests
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utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
y compris la photo-copie et les photocopying and microfilm, without permission in writing from
électronique ou mécanique,
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PRICE CODE
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Pour prix, voir catalogue en vigueur
For price, see current catalogue

60068-3-8  IEC:2003 – 3 –
CONTENTS
FOREWORD.5
INTRODUCTION.9
1 Scope.11
2 Normative references .11
3 Terms and definitions .13
4 Description of vibration test methods .15
4.1 General .15
4.2 Test methods .15
4.3 Accelerated testing.19
5 Vibration environment of a specimen .19
5.1 General .19
5.2 Collecting information, preparing a decision .19
5.3 Definition of dynamic conditions .21
6 Estimation of ‘real life’ dynamic conditions for the specimen.21
6.1 General .21
6.2 Measurement of dynamic conditions.21
6.3 Data analysis .23
7 Selection of test method .31
7.1 General .31
7.2 Sine testing .33
7.3 Random testing .33
7.4 Mixed mode testing .35
8 Vibration response investigation of the specimen .35
8.1 General .35
8.2 Aims, purposes .37
8.3 Sinusoidal excitation .37
8.4 Random excitation.39
8.5 Problem investigation (troubleshooting).39
8.6 Survival pass/fail criterion .39
8.7 Information to be given in the relevant specification .43
Bibliography.45
Figure 1 – Probability density of a single frequency sinusoidal signal.27
Figure 2 – Probability density of a mixture of sine and random signals.27
Figure 3 – Autocorrelation functions for various signals .29
Table 1 – Examples of vibration environment and recommended test method .31
Table 2 – Recommended method for response investigation.43

60068-3-8  IEC:2003 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 3-8: Supporting documentation and guidance –
Selecting amongst vibration tests
FOREWORD
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International Standard IEC 60068-3-8 has been prepared by IEC technical committee 104:
Environmental conditions, classification and methods of test.
The text of this standard is based on the following documents:
FDIS Report on voting
...