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IEC 60068-2-64
Edition 2.0 2019-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
A MENDMENT 1
AM ENDEMENT 1
Environmental testing –
Part 2-64: Tests – Test Fh: Vibration, broadband random and guidance
Essais d’environnement –
Partie 2-64: Essais – Essai Fh: Vibrations aléatoires à large bande et guide
IEC 60068-2-64:2008-04/AMD1:2019-10(en-fr)
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IEC 60068-2-64
Edition 2.0 2019-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
A MENDMENT 1
AM ENDEMENT 1
Environmental testing –
Part 2-64: Tests – Test Fh: Vibration, broadband random and guidance
Essais d’environnement –
Partie 2-64: Essais – Essai Fh: Vibrations aléatoires à large bande et guide
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-7458-3
– 2 – IEC 60068-2-64:2008/AMD1:2019
© IEC 2019
FOREWORD
This amendment has been prepared by IEC technical committee 104: Environmental
conditions, classification and methods of test.
The text of this amendment is based on the following documents:
FDIS Report on voting
104/848/FDIS 104/855/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC website under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
___________
INTRODUCTION
Add, after the fourth paragraph, the following new paragraph:
The traditional general purpose broad-band random vibration test utilizes waveforms with a
Gaussian distribution of amplitudes. However, when so specified, this test procedure can also
be utilized with random vibration tests with a non-Gaussian distribution of amplitudes. Such
tests are sometimes alternatively known as high kurtosis tests.
Add, after the last paragraph, the following new paragraph:
Annex C is an informative annex giving information on non-Gaussian distribution/high kurtosis
tests.
© IEC 2019
3 Definitions
Add the following new terminological entries:
3.39
kurtosis
th
4 statistical moment, which provides a measure of the shape of an amplitude distribution
Note 1 to entry: Typically a waveform with Gaussian distribution will have a kurtosis of 3, if considered over an
infinite period.
Note 2 to entry: Kurtosis is given by:
N
kurtosis xx−.
( )
∑ i
N σ
i=1
where:
σ is the standard deviation of the N values which describe the waveform;
x are individual values representing the waveform described by N such values;
i