SIST EN IEC 60068-2-85:2019

SLOVENSKI STANDARD
SIST EN IEC 60068-2-85:2019
01-november-2019
Okoljski preskusi - 2-85. del: Preskusi - Preskus Fj: Vibracije - Dolga časovna
replikacija (IEC 60068-2-85:2019)
Environmental testing - Part 2-85: Tests - Test Fj: Vibration - Long time history replication
(IEC 60068-2-85:2019)
Umgebungseinflüsse - Teil 2-85: Prüfverfahren - Prüfung Fj: Schwingen, Nachbildung
von Langzeitsignalen (IEC 60068-2-85:2019)
Essais d'environnement - Partie 2-85 : Essais - Essai Fj: Vibrations - Reproduction dans
le temps par accélérogrammes (IEC 60068-2-85:2019)
Ta slovenski standard je istoveten z: EN IEC 60068-2-85:2019
ICS:
17.160 Vibracije, meritve udarcev in Vibrations, shock and
vibracij vibration measurements
19.040 Preskušanje v zvezi z Environmental testing
okoljem
SIST EN IEC 60068-2-85:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60068-2-85:2019


EUROPEAN STANDARD EN IEC 60068-2-85

NORME EUROPÉENNE

EUROPÄISCHE NORM
August 2019
ICS 19.040

English Version
Environmental testing - Part 2-85: Tests - Test Fj: Vibration -
Long time history replication
(IEC 60068-2-85:2019)
Essais d'environnement - Partie 2-85 : Essais - Essai Fj: Umgebungseinflüsse - Teil 2-85: Prüfverfahren - Prüfung Fj:
Vibrations - Reproduction dans le temps par Schwingen, Nachbildung von Langzeitsignalen
accélérogrammes (IEC 60068-2-85:2019)
(IEC 60068-2-85:2019)
This European Standard was approved by CENELEC on 2019-07-25. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.



European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60068-2-85:2019 E

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SIST EN IEC 60068-2-85:2019
EN IEC 60068-2-85:2019 (E)
European foreword
The text of document 104/833/FDIS, future edition 1 of IEC 60068-2-85, prepared by IEC/TC 104
"Environmental conditions, classification and methods of test" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN IEC 60068-2-85.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-04-25
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-07-25
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60068-2-85:2019 was approved by CENELEC as a
European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60068-3-8 NOTE Harmonized as EN 60068-3-8
IEC 60068-2-27 NOTE Harmonized as EN 60068-2-27
IEC 60068-2-81 NOTE Harmonized as EN 60068-2-81
IEC 60068-1 NOTE Harmonized as EN 60068-1
IEC 60068-5-2 NOTE Harmonized as EN 60068-5-2
ISO/IEC 17025:2017 NOTE Harmonized as EN ISO/IEC 17025:2017 (not modified)
IEC 60721-3 (series) NOTE Harmonized as EN 60721-3-9:1993/A1 (series)

2

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EN IEC 60068-2-85:2019 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.

Publication Year Title EN/HD Year
IEC 60068-2-6 -  Environmental testing - Part 2-6: Tests - Test Fc: EN 60068-2-6 -
Vibration (sinusoidal)
IEC 60068-2-47 -  Environmental testing - Part 2-47: Test - Mounting of EN 60068-2-47 -
specimens for vibration, impact and similar dynamic
tests
IEC 60068-2-64 2008 Environmental testing - Part 2-64: Tests - Test Fh: EN 60068-2-64 2008
Vibration, broadband random and guidance

3

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SIST EN IEC 60068-2-85:2019



IEC 60068-2-85

®


Edition 1.0 2019-06




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Environmental testing –

Part 2-85: Tests – Test Fj: Vibration – Long time history replication




Essais d'environnement –

Partie 2-85: Essais – Essai Fj: Vibrations – Reproduction dans le temps par

accélérogrammes















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 19.040 ISBN 978-2-8322-7079-0




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.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Requirements for test apparatus . 9
4.1 General . 9
4.2 Basic motion . 9
4.3 Cross-axis motion . 9
4.4 Mounting . 10
4.5 Measuring systems . 10
5 Severities . 10
6 Preconditioning . 10
7 Initial measurements and functional performance test. 10
8 Testing . 10
8.1 General . 10
8.2 Initial vibration response investigation . 11
8.3 Low-level excitation for equalization prior to testing . 12
8.4 Testing with specimen functioning . 12
8.5 Final vibration response investigation . 12
9 Recovery . 12
10 Final measurements and functional performance . 13
11 Information to be given in the relevant specification . 13
12 Information to be given in the test report. 13
Annex A (informative) Guidance . 15
A.1 General . 15
A.2 Requirements for testing . 15
A.2.1 Single-point control . 15
A.2.2 Controlled input testing . 16
A.2.3 Controlled response testing . 16
A.2.4 Verification parameters . 16
A.3 Testing procedures . 18
A.4 Equipment normally used with vibration isolators . 18
A.4.1 Transmissibility factors for isolators . 18
A.4.2 Temperature effect . 18
A.5 Test severities . 18
A.6 Equipment performance . 18
A.7 Initial and final measurements . 19
A.8 Frequency range . 19
Bibliography . 21

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IEC 60068-2-85:2019 © IEC 2019 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ENVIRONMENTAL TESTING –

Part 2-85: Tests – Test Fj: Vibration –
Long time history replication

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by 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
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60068-2-85 has been prepared by IEC technical committee 104:
Environmental conditions, classification and methods of test.
The text of this International Standard is based on the following documents:
FDIS Report on voting
104/833/FDIS 104/840/RVD

Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60068 series, published under the general title Environmental testing,
can be found on the IEC website.

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The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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IEC 60068-2-85:2019 © IEC 2019 – 5 –
INTRODUCTION
This first edition of IEC 60068-2-85 was initiated in 2008 and a first proposal was prepared in
2011. It was developed out of the existing standard IEC 60068-2-64:2008 which contains a
technically similar test method and modified accordingly. This facilitates usage and
maintenance of both standards.
Differences are that this document relies on a specified time history. A test spectrum is not
specified.
This part of IEC 60068 deals with long time history replication vibration testing intended for
general application to components, equipment and other products, hereinafter referred to as
”specimens”, that may be subjected to vibrations of an arbitrary nature not covered by the other
existing methods for vibration testing. The methods and techniques in this document are based
on digital control of vibration in the time domain which allow a more flexible definition of the
vibration input signal to suit individual cases that are specified in the relevant specification.
Compared with most other tests, test Fj is based on deterministic techniques, and the time
history is supposed to have a long duration. There are nearly no restrictions to the vibration
characteristics besides the technical limitations of the test apparatus.
As the vibration input signal in this test is specified by a digital time history stored in a file, there
are no general methods for comparing two different test severities. The vibration tolerances
cannot be given in a single measure, as this depends on the purpose of the test. Therefore, it
is emphasized that long time history replication testing always demands a high degree of
engineering judgement by the user and specifier. The writer of the relevant specification is
expected to select the testing procedure, test time history and its severity, tolerances and
analysis methods, appropriate to the specimen and its use.
The test method is based primarily on the use of an electrodynamic or a servo-hydraulic
vibration generator with an associated computer-based control system used as a vibration
testing system.
Long time history replication vibration testing can be used to identify accumulated stress effects
and the resulting mechanical weakness and degradation in the specified performance. This
information, in conjunction with the relevant specification, can be used to assess the
acceptability of specimens.
If the specimens are subjected to vibration of a deterministic transient or periodic nature
resulting from transportation or real life environments that are covered by other test methods,
1
these are generally preferred. See IEC 60068-3-8 [1] for estimating the dynamic vibration
environment of the specimen and based on that, selecting the appropriate test method.
Annex A provides guidance and a list of details that can be considered for inclusion in
specifications.

___________
1
Numbers in square brackets refer to the bibliography.

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ENVIRONMENTAL TESTING –

Part 2-85: Tests – Test Fj: Vibration –
Long time history replication



1 Scope
This part of IEC 60068 demonstrates the adequacy of specimens to resist dynamic loads
without unacceptable degradation of its functional and/or structural integrity when subjected to
the specified vibration test requirements as defined by a time history (long time history
replication). These can either be recorded in measurement exercises or generated artificially.
In both cases, this method allows for generating a test tailored to very specific applications.
Typical applications are tests in which very specific deterministic transient, periodical or random
excitation is necessary and the characteristics of the motion are not covered by other test
standards. This includes time histories not sufficiently represented by the standard shock tests
of IEC 60068-2-27 [2] or a general description by a shock response spectrum as in
IEC 60068-2-81 [3], periodical vibration that is not covered by a sinusoidal waveform as in
IEC 60068-2-6, and random vibration that is not covered by the description of Gaussian or non-
Gaussian (high kurtosis) broad-band random vibration of IEC 60068-2-64. However, the user is
made aware that long time history replication uses a deterministic time history. Simulation of
random vibration of any kind is approximated by quasi-random.
In addition, additional mixed mode tests are possible with this test method by generating time
histories that are representations of the required test signals. This includes tests of high
complexity.
The purpose of this test is different from IEC 60068-2-57 [4]. The purpose of IEC 60068-2-57
is an evaluation for a transient vibration using mainly a synthesized time history. A long time
history test is mainly used for a durability and functionality test using an actual time history
measured in a real field environment. It can also be used as a method to apply a simulated non-
gaussian time history.
This document is applicable to specimens which can be subjected to vibration of a very specific
nature resulting from transportation or operational environments, for example in aircraft, space
vehicles and land vehicles. It is primarily intended for unpackaged specimens, and for items in
their transportation container when the latter can be considered as part of the specimen itself.
However, if the item is packaged, then the item itself is referred to as a product and the item
and its packaging together are referred to as a test specimen. This document can be used in
conjunction with IEC 60068-2-47, for testing packaged products.
Although primarily intended for electrotechnical specimens, this document is not restricted to
them and can be used in other fields where desired (see Annex A).
This document is applicable for single axis excitation.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)

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IEC 60068-2-85:2019 © IEC 2019 – 7 –
IEC 60068-2-47, Environmental testing – Part 2-47: Tests – Mounting of specimens for vibration,
impact and similar dynamic tests
IEC 60068-2-64:2008, Environmental testing – Part 2-64: Tests – Test Fh: Vibration, broadband
random and guidance
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
NOTE The terms used are generally defined in IEC 60050-300 [5], IEC 60068-1 [6], IEC 60068-2-6, and
IEC 60068-5-2 [7] and ISO 2041 [8].
3.1
cross-axis motion
motion not in the direction of the stimulus, generally specified in the two axes orthogonal to the
direction of the stimulus
Note 1 to entry: The cross-axis motion should be measured close to the fixing points.
[SOURCE: IEC 60068-2-64:2008, 3.1]
3.2
fixing point
part of the specimen in contact with the fixture or vibration table at a point where the specimen
is normally fastened in service
Note 1 to entry: If a part of the real mounting structure is used as the fixture, the fixing points are taken as those of
the mounting structure and not of the specimen.
[SOURCE: IEC 60068-2-64:2008, 3.3]
3.3
measuring points
specific points at which data are gathered for conducting the test
Note 1 to entry: These points are of three types, as defined in 3.4 to 3.6.
[SOURCE: IEC 60068-2-64:2008, 3.6]
3.4
checkpoint
point located on the fixture, on the vibration table or on the specimen as close as possible to
one of its fixing points, and in any case, rigidly connected to it
[SOURCE: IEC 60068-2-64:2008, 3.7, modified – The notes to entry have been deleted.]
3.5
control point
point, chosen from amongst the checkpoints, whose signal is used to control the test, such that
the requirements of IEC 60068-2-85 are satisfied

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[SOURCE: IEC 60068-2-64:2008, 3.8, modified – The term “reference point (single-point
control)” has been replaced with "control point" and in the definition "this standard" has been
replaced with "IEC 60068-2-85".]
3.6
response points
specific points on the specimen from which data is gathered for the purpose of the vibration
response investigation
Note 1 to entry: These points are not the same as checkpoints or control points.
[SOURCE: IEC 60068-2-64:2008, 3.10]
3.7
preferred testing axes
three orthogonal axes that correspond to the most vulnerable axes of the specimen
[SOURCE: IEC 60068-2-64:2008, 3.11]
3.8
specified time history
data file containing digital acceleration values varying with time to be replicated during the test
Note 1 to entry: The specified time history is usually based on recorded ‘real life’ digitized data, properly modified
(e.g. filtered) for reproducibility on a shaker.
3.9
control time history
time history measured at the control point simulating the specified time history
3.10
error time history
difference between the specified time history and the control time history
3.11
equalization
minimization of the RMS of error time history
3.12
RMS value
root-mean-square value
square root of the average of the squared values of all functions over the total frequency interval
f and f
1 2
[SOURCE: IEC 60068-2-64:2008, 3.33, modified – The definition has been simplified.]
3.13
test frequency range
frequency range to use for processing control, as given in the relevant specification
3.14
probability density function
at a specified amplitude, ratio of the probability that the amplitude will be within a given
incremental range, to the size of the incremental range

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3.15
maximum response spectrum
curve giving the value of the highest peak of the response of a linear single degree of freedom
system (SDOF system) to vibration, according to its natural frequency, for a given damping ratio
Note 1 to entry: The response is described by the relative movement of the mass of this system in relation to its
support.
3.16
fatigue damage spectrum
FDS
spectrum obtained by tracing the fatigue damage experienced by a linear single degree of
freedom system (SDOF) according to its natural frequency, for a given damping ratio and for a
given value of parameter b
Note 1 to entry: Parameter b comes from the Basquin law representing the Wöhler curve of the material constituting
the structure.
Note 2 to entry: This note applies to the French language only.
4 Requirements for test apparatus
4.1 General
The required characteristics apply to the complete vibration system, which includes the power
amplifier, vibrator, test fixture, specimen and control system when loaded for testing.
The standardized test method consists of the following test sequence normally applied in each
of the mutually perpendicular axes of the test specimen:
1) an initial vibration response investigation, with low level sinusoidal excitation, or low level
random excitation, (see 8.2 and Clause A.1);
2) the long time history replication as the mechanical load or stress test;
3) a final vibration response investigation to compare the results with the initial one and to
detect possible mechanical failures due to a change of the dynamic behaviour
(see 8.2 and 8.5).
Where the dynamic behaviour is known, and it is not considered relevant, or sufficient data can
be gathered during the test at full level, the relevant specification may not require pre and post
test vibration response investigations.
4.2 Basic motion
The basic motion of the fixing points of the specimen shall be specified by the relevant
specification. The fixing points shall have substantially identical motions in phase and amplitude
and shall be rectilinear relative to the direction of excitation.
4.3 Cross-axis motion
Cross-axis motion shall be checked, if required by the relevant specification, either before the
test is applied by conducting a sine or random investigation at a level specified by the relevant
specification, or during testing by utilizing additional monitoring channels in the two
perpendicular axes.
The maximum cross axis amplitude at the control point shall not exceed 50 % of the value of
the specified axis. With large-size or high mass spe
...