SIST EN ISO 5349-1:2002
(Main)Mechanical vibration - Measurement and evaluation of human exposure to hand-transmitted vibration - Part 1: General requirements (ISO 5349-1:2001)
Mechanical vibration - Measurement and evaluation of human exposure to hand-transmitted vibration - Part 1: General requirements (ISO 5349-1:2001)
Mechanische Schwingungen - Messung und Bewertung der Einwirkung von Schwingungen auf das Hand-Arm-System des Menschen - Teil 1: Allgemeine Anforderungen (ISO 5349-1:2001)
Dieser Teil von ISO 5349 legt allgemeine Anforderungen an die Messung und Angabe der Einwirkung von Schwingungen fest, die in drei orthogonalen Richtungen auf das Hand-Arm-System übertragen werden. Er definiert eine Frequenzbewertung sowie Bandbegrenzungsfilter, um einen Vergleich einheitlich ermittelter Messwerte zu ermöglichen. Die ermittelten Werte können verwendet werden, um schädliche Auswirkungen von Hand-Arm-Schwingungen im Frequenzbereich der Oktavbänder von 8 Hz bis 1000 Hz vorher-zusagen.
Dieser Teil von ISO 5349 gilt für periodische, stochastische und nichtperiodische Schwingungen. Vorläufig gilt dieser Teil von ISO 5349 auch im Zusammenhang mit Erregung durch wiederholt auftretende Stöße (Einzelstöße).
ANMERKUNG 1 Die Abhängigkeit zwischen der zeitlichen Einwirkung von wiederholt auftretenden Stößen und ihren Auswirkungen beim Menschen ist noch nicht in vollem Umfang bekannt. Die Anwendung dieses Teils von ISO 5349 für diese Art von Schwingungen sollte daher mit Vorsicht erfolgen.
Dieser Teil von ISO 5349 stellt eine Anleitung zur quantitativen Bestimmung der Belastung mit Hand-Arm-Schwingun-gen zur Verfügung, die sich aus der frequenzbewerteten Schwingbeschleunigung und der täglichen Einwirkungsdauer ergibt. Er legt keine Grenzwerte für eine unschädliche Schwingungs-exposition fest.
ANMERKUNG 2 Anhang C befasst sich mit der relativen Bedeutung verschiedener Charak-teristika von Schwingungsbelastungen, von denen angenommen wird, dass sie gesundheit-liche Auswirkungen haben.
Vibrations mécaniques - Mesurage et évaluation de l'exposition des individus aux vibrations transmises par la main - Partie 1: Exigences générales (ISO 5349-1:2001)
La présente partie de l'SO 5349 spécifie des exigences générales en matière de mesurage et de présentation de l'exposition aux vibrations transmises par la main selon trois axes orthogonaux. Elle définit une pondération fréquentielle et des filtres limiteurs de bande afin de permettre une comparaison uniforme des mesurages. Les valeurs obtenues peuvent être utilisées pour prévoir les effets contraires des vibrations transmises par la main sur la gamme de fréquences couverte par les bandes d'octave comprises entre 8 Hz et 1 000 Hz. La présente partie de l'ISO 5349 est applicable aux vibrations périodiques ainsi qu'aux vibrations aléatoires ou non périodiques. Elle est applicable aussi, provisoirement, aux excitations répétées du type choc (impact).
NOTE 1 La dépendance en fonction du temps de la réponse des individus aux chocs répétés n'est pas entièrement connue. Appliquer la présente partie de l'ISO 5349 à ces vibrations avec la plus grande prudence. La présente partie de l'ISO 5349 fournit des indications pour l'évaluation de l'exposition aux vibrations transmises par la main, spécifiée en termes d'accélération de la vibration pondérée en fréquence et de durée d'exposition quotidienne. Elle ne définit pas de limites admissibles d'exposition.
NOTE 2 L'annexe C traite de l'importance relative approximative des diverses caractéristiques de l'exposition aux vibrations qui sont censées avoir des répercussions sur la santé.
Mechanical vibration - Measurement and evaluation of human exposure to hand-transmitted vibration - Part 1: General requirements (ISO 5349-1:2001)
General Information
Relations
Related Packages
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 5349-1:2002
01-januar-2002
1DGRPHãþD
SIST ENV 25349:2000
Mechanical vibration - Measurement and evaluation of human exposure to hand-
transmitted vibration - Part 1: General requirements (ISO 5349-1:2001)
Mechanical vibration - Measurement and evaluation of human exposure to hand-
transmitted vibration - Part 1: General requirements (ISO 5349-1:2001)
Mechanische Schwingungen - Messung und Bewertung der Einwirkung von
Schwingungen auf das Hand-Arm-System des Menschen - Teil 1: Allgemeine
Anforderungen (ISO 5349-1:2001)
Vibrations mécaniques - Mesurage et évaluation de l'exposition des individus aux
vibrations transmises par la main - Partie 1: Exigences générales (ISO 5349-1:2001)
Ta slovenski standard je istoveten z: EN ISO 5349-1:2001
ICS:
13.160 Vpliv vibracij in udarcev na Vibration and shock with
ljudi respect to human beings
SIST EN ISO 5349-1:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
EN ISO 5349-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2001
ICS 13.160 Supersedes ENV 25349:1992
English version
Mechanical vibration - Measurement and evaluation of human
exposure to hand-transmitted vibration - Part 1: General
requirements (ISO 5349-1:2001)
Vibrations mécaniques - Mesurage et évaluation de Mechanische Schwingungen - Messung und Bewertung der
l'exposition des individus aux vibrations transmises par la Einwirkung von Schwingungen auf das Hand-Arm-System
main - Partie 1: Exigences générales (ISO 5349-1:2001) des Menschen - Teil 1: Allgemeine Anforderungen (ISO
5349-1:2001)
This European Standard was approved by CEN on 10 May 2001.
CEN 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 Management Centre or to any CEN 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 CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
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Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5349-1:2001 E
worldwide for CEN national Members.
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EN ISO 5349-1:2001 (E)
Foreword
The text of the International Standard from Technical Committee ISO/TC 108 "Mechanical vibration
and shock" of the International Organization for Standardization (ISO) has been taken over as an
European Standard by Technical Committee CEN/TC 231 "Mechanical vibration and shock", the
secretariat of which is held by DIN.
This European Standard replaces ENV 25349:1992.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by February 2002, and conflicting national standards
shall be withdrawn at the latest by February 2002.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of the International Standard ISO 5349-1:2001 has been approved by CEN as a European
Standard without any modification.
NOTE: Normative references to International Standards are listed in annex ZA (normative).
2
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EN ISO 5349-1:2001 (E)
Annex ZA (normative)
Normative references to international publications
with their relevant 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 Where an International Publication has been modified by common modifications, indicated by
(mod.), the relevant EN/HD applies.
Publication Year Title EN Year
ISO 8041 1990 Human response to vibration - ENV 28041 1993
Measuring instrumentation
3
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INTERNATIONAL ISO
STANDARD 5349-1
First edition
2001-05-01
Mechanical vibration — Measurement
and evaluation of human exposure
to hand-transmitted vibration —
Part 1:
General requirements
Vibrations mécaniques — Mesurage et évaluation de l'exposition des
individus aux vibrations transmises par la main —
Partie 1: Exigences générales
Reference number
ISO 5349-1:2001(E)
©
ISO 2001
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ISO 5349-1:2001(E)
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ii © ISO 2001 – All rights reserved
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ISO 5349-1:2001(E)
Contents Page
Foreword.iv
Introduction.vi
1 Scope .1
2 Normative references .1
3 Terms, definitions and symbols.2
3.1 Terms and definitions .2
3.2 Symbols .2
4 Characterization of hand-transmitted vibration .2
4.1 General considerations.2
4.2 Measuring equipment for hand-transmitted vibration.3
4.3 Coupling of the hand to the vibration source.5
4.4 Quantity to be measured.5
4.5 Multi-axis vibration .5
5 Characterization of hand-transmitted vibration exposure .6
5.1 General.6
5.2 Daily exposure duration.6
5.3 Daily vibration exposure .6
6 Information to be reported.7
Annex A (normative) Frequency-weighting and band-limiting filters.8
Annex B (informative) Guidance on health effects of hand-transmitted vibration.11
Annex C (informative) Relationship between vibration exposure and effects on health .15
Annex D (informative) Factors likely to influence the effects of human exposure to hand-transmitted
vibration in working conditions .18
Annex E (informative) Preventive measures to be adopted by those responsible for occupational
health and safety.19
Annex F (informative) Guidelines for reporting additional information .21
Bibliography.24
© ISO 2001 – All rights reserved iii
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ISO 5349-1:2001(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this part of ISO 5349 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 5349-1 was prepared by Technical Committee ISO/TC 108, Mechanical vibration and
shock, Subcommittee SC 4, Human exposure to mechanical vibration and shock.
This first edition of ISO 5349-1 cancels and replaces ISO 5349:1986, of which it constitutes a technical revision. It
is, in most respects, compatible with its predecessor, but differs from it technically in several important respects.
In the previous version, the evaluation of vibration exposure was based on the directional component with the
greatest frequency-weighted root-mean-square acceleration. In the present version, the evaluation is based on the
“vibration total value”, i.e. the root-sum-of-squares of the three frequency-weighted root-mean-square component
values. This change recognizes the fact that the vibration characteristics of some power tool types are not
dominated by a single directional component.
Vibration exposures based on the root-sum-of-squares method will have values greater than those reported for a
single direction of vibration. Measurement of vibration in three axes will result in a vibration total value of up to
1,7 times (typically between 1,2 and 1,5 times) the magnitude of the greatest component. For data obtained in
accordance with ISO 5349:1986, the vibration total value can be calculated from the three component values as
shown in 4.5 of this part of ISO 5349. Where only the greatest single-axis value is available, the vibration total
value shall be estimated from this value using a suitable multiplying factor as discussed in 4.5.
The daily vibration exposure in accordance with this part of ISO 5349 is based on the 8-h energy-equivalent
acceleration value. The previous version used a reference duration of 4 h. The change to the more conventional
8-h reference duration brings the evaluation of vibration exposure into line with the “time-weighted average”
procedures commonly used for the evaluation of human exposures to noise and to chemical substances. The use
of the 8-h reference duration is purely a matter of convention and does not imply that a “typical” daily exposure
duration is 8 h. Conversion of 4-h equivalent magnitudes to 8-h values is achieved easily, by applying a multiplying
factor of 0,7.
The frequency weighting previously had a slope of zero at frequencies below 16 Hz and –6 dB per octave at higher
frequencies and applied over the frequency range covered by the octave bands from 8 Hz to 1 000 Hz. It is now
defined mathematically in annex A as a realizable filter characteristic, designated W . Band-limiting filters are also
h
defined with cut-off frequencies of 6,3 Hz and 1 250 Hz. The one-third-octave band weighting factors, also given in
annex A, differ slightly from those in the previous version in that they describe the W curve with band-limiting
h
included.
iv © ISO 2001 – All rights reserved
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ISO 5349-1:2001(E)
The guidance in annex C on the relationship between vibration exposure and the development of vascular
symptoms, is broadly compatible with that in annex A of the previous version, but is restricted to consideration of a
prevalence of 10 % in order to limit the potential for inappropriate use of the relationship. Compared to the previous
version, daily vibration exposures are now expressed as 8-h energy-equivalent values and the values quoted have
been multiplied by a factor of 1,4 to estimate the increase resulting from the change from evaluation using the
greatest single-axis value to evaluation using the vibration total value.
International Standard ISO 5349 consists of the following parts, under the general title Mechanical vibration —
Measurement and evaluation of human exposure to hand-transmitted vibration:
Part 1: General requirements
Part 2: Practical guidance for measurement at the workplace
Annex A forms a normative part of this part of ISO 5349. Annexes B to F are for information only.
© ISO 2001 – All rights reserved v
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ISO 5349-1:2001(E)
Introduction
Intensive vibration can be transmitted to the hands and arms of operators from vibrating tools, vibrating machinery
or vibrating workpieces. Such situations occur, for example, when a person handles tools such as pneumatic,
electric, hydraulic or internal combustion engine-driven chain saws, percussive tools or grinders.
Depending on the type and place of work, vibration can enter one arm only, or both arms simultaneously, and may
be transmitted through the hand and arm to the shoulder. The vibration of body parts and the perceived vibration
are frequently a source of discomfort and possibly reduced proficiency. Continued, habitual use of many vibrating
power tools has been found to be connected with various patterns of diseases affecting the blood vessels, nerves,
bones, joints, muscles or connective tissues of the hand and forearm.
The vibration exposures required to cause these disorders are not known precisely, neither with respect to vibration
magnitude and frequency spectrum, nor with respect to daily and cumulative exposure duration. The guidance
given in this part of ISO 5349 is derived from limited quantitative data available from both practical experience and
laboratory experimentation concerning human response to hand-transmitted vibration, and on limited information
regarding current exposure conditions. It is thus difficult to propose a comprehensive method for the evaluation of
vibration exposure. However, the use of the information given in this part of ISO 5349 should protect the majority of
workers against serious health impairment associated with hand-transmitted vibration. It may also assist in the
development of new hand-operated power tools to reduce the risk of vibration-related health effects. It does not
define safe exposure ranges in which vibration diseases cannot occur.
The use of this part of ISO 5349 will contribute to the gathering of consistent data in order to improve occupational
safety. In particular, it is hoped that such data will serve to extend the present knowledge of dose-effect
relationships.
This part of ISO 5349 specifies the general requirements for the measurement and evaluation of human exposure
to hand-transmitted vibration. It is supplemented by the information given in ISO 5349-2, which gives practical
guidance for the implementation of appropriate measurement and evaluation techniques at the workplace.
Instrumentation to be used for measurements made in accordance with ISO 5349 is fully specified in ISO 8041.
Annex A contains definitions for the frequency weighting W and for band-limiting filters, required for measurement
h
of frequency-weighted acceleration in accordance with ISO 5349.
Annex B contains information on the health effects of hand-transmitted vibration, while annex C gives guidance
which may assist competent authorities responsible for the definition of exposure limits or action levels as required.
Annex D contains information on other factors which can affect human response to hand-transmitted vibration and
annex E contains guidance on preventive measures for those responsible for occupational health and safety.
To facilitate further progress in this field and to allow the quantitative comparison of exposure data, uniform
methods for measuring and reporting exposure of human beings to hand-transmitted vibration are desirable.
Further information is contained in annex F.
vi © ISO 2001 – All rights reserved
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INTERNATIONAL STANDARD ISO 5349-1:2001(E)
Mechanical vibration — Measurement and evaluation of human
exposure to hand-transmitted vibration —
Part 1:
General requirements
1 Scope
This part of ISO 5349 specifies general requirements for measuring and reporting hand-transmitted vibration
exposure in three orthogonal axes. It defines a frequency weighting and band-limiting filters to allow uniform
comparison of measurements. The values obtained can be used to predict adverse effects of hand-transmitted
vibration over the frequency range covered by the octave bands from 8 Hz to 1 000 Hz.
This part of ISO 5349 is applicable to periodic and to random or non-periodic vibration. Provisionally, this part of
ISO 5349 is also applicable to repeated shock type excitation (impact).
NOTE 1 The time dependency for human response to repeated shocks is not fully known. Application of this part of
ISO 5349 for such vibration is to be made with caution.
This part of ISO 5349 provides guidance for the evaluation of hand-transmitted vibration exposure, specified in
terms of a frequency-weighted vibration acceleration and daily exposure time. It does not define limits of safe
vibration exposure.
NOTE 2 Annex C is concerned with the approximate relative importance of various characteristics of the vibration exposure
which are believed to produce health effects.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 5349. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 5349 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain
registers of currently valid International Standards.
ISO 2041, Vibration and shock — Vocabulary.
ISO 5349-2, Mechanical vibration — Measurement and evaluation of human exposure to hand-transmitted
vibration — Part 2: Practical guidance for measurement at the workplace.
ISO 8041,Humanresponsetovibration — Measuring instrumentation.
IEC 61260, Electroacoustics — Octave-band and fractional-octave-band filters.
© ISO 2001 – All rights reserved 1
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ISO 5349-1:2001(E)
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this part of ISO 5349, the terms and definitions given in ISO 2041 apply.
NOTE For the convenience of users of this part of ISO 5349, a glossary of terms relating to medical conditions is given in
annex B.
3.2 Symbols
In this part of ISO 5349, the following symbols are used.
a (t) instantaneous single-axis acceleration value of the frequency-weighted hand-transmitted vibration
hw
2
at time t, in metres per second squared (m/s );
a root-mean-square (r.m.s.) single-axis acceleration value of the frequency-weighted hand-
hw
2
transmitted vibration, in metres per second squared (m/s );
2
a , a , a values of a , in metres per second squared (m/s ), for the axes denoted x, y and z respectively;
hwx hwy hwz hw
a vibration total value of frequency-weighted r.m.s. acceleration (sometimes known as the vector
hv
sum or the frequency-weighted acceleration sum); it is the root-sum-of-squares of the a values
hw
2
for the three measured axes of vibration, in metres per second squared (m/s );
a daily vibration exposure (8-h energy-equivalent vibration total value), in metres per second
hv(eq,8h)
2
squared (m/s );
A(8) a convenient alternative term for the daily vibration exposure a ;
hv(eq,8h)
D group mean total (lifetime) exposure duration, in years;
y
T total daily duration of exposure to the vibration a ;
hv
T reference duration of 8 h (28 800 s);
0
W frequency-weighting characteristic for hand-transmitted vibration.
h
4 Characterization of hand-transmitted vibration
4.1 General considerations
The method specified in this part of ISO 5349 takes account of the following factors which are known to influence
the effects of human exposure to hand-transmitted vibration in working conditions:
a) the frequency spectrum of vibration;
b) the magnitude of vibration;
c) the duration of exposure per working day;
d) the cumulative exposure to date.
Other factors which may influence the effects of vibration exposure, but for which standardized methods for
reporting do not yet exist, are listed in annex D.
2 © ISO 2001 – All rights reserved
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ISO 5349-1:2001(E)
4.2 Measuring equipment for hand-transmitted vibration
4.2.1 General
Measurement of hand-transmitted vibration shall be undertaken using instrumentation conforming to the
requirements of ISO 8041. This equipment shall be checked for correct operation before and after use. The
calibration shall be traceable to a recognized standard maintained by an accredited laboratory.
4.2.2 Vibration transducers
The vibration transducer may be an accelerometer which may be designed to make general vibration
measurements (for non-percussive tools) or may be specifically designed for large peak accelerations such as
those produced by percussive tools.
The vibration transducers shall be able to withstand the range of vibration magnitudes and shall have stable
characteristics. The dimensions of the transducers shall be such that they do not interfere with the operation of the
machine and such that the location of the point of measurement can be identified.
ISO 5349-2 contains further guidance on the selection of transducers.
4.2.3 Location and orientation of transducers
The vibration transmitted to the hand shall be measured and reported for three directions of an orthogonal
coordinate system such as defined in Figure 1.
For practical vibration measurements, the orientation of the coordinate system may be defined with reference to an
appropriate basicentric coordinate system (see Figure 1) originating, for example, in a vibrating appliance,
workpiece, handle or control device gripped by the hand (see ISO 8727 for further information).
The vibration in the three directions should preferably be measured simultaneously. Measurements made
sequentially along each of the three axes are acceptable, provided the operating conditions are similar for all three
measurements. The measurements shall be made on the vibrating surface as close as possible to the centre of the
gripping zone of the machine, tool or workpiece. The location of the transducers shall be reported.
NOTE The vibration magnitude can vary considerably with position on the vibrating surface.
Further guidance on transducer positioning is given in ISO 5349-2.
4.2.4 Mounting of transducers
The transducers should be mounted rigidly. Further information on accelerometer mounting is given in ISO 5348
and ISO 5349-2. Practical guidance on mounting transducers in difficult situations (such as on resilient surfaces or
where the vibration is impulsive), and on the use of hand-held adaptors, is also given in ISO 5349-2.
© ISO 2001 – All rights reserved 3
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ISO 5349-1:2001(E)
a) “Handgrip” position (In this position, the hand adopts a standardized grip on a cylindrical bar)
Key
����� Biodynamic coordinate system
--------------- Basicentric coordinate system
b) “Flat palm” position (In this position, the hand presses down onto a sphere)
NOTE The origin of the biodynamic coordinate system is the head of the third metacarpal (distal extremity). The z -axis
h
(i.e. hand axis) is defined as the longitudinal axis of the third metacarpal bone and is oriented positively towards the distal end of
the finger. The x -axis passes through the origin, is perpendicular to the z -axis, and is positive in the forwards direction when
h h
the hand is in the normal anatomical position (palm facing forwards). The y -axis is perpendicular to the other two axes and is
h
positive in the direction towards the fifth finger (thumb). In practice, the basicentric coordinate system is used: the system is
generally rotated in the y-z plane so that the y -axis is parallel to the handle axis.
h
Figure 1 — Coordinate systems for the hand
4 © ISO 2001 – All rights reserved
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ISO 5349-1:2001(E)
4.3 Coupling of the hand to the vibration source
Although characterization of the vibration exposure currently uses the acceleration of the surface in contact with the
hand as the primary quantity, it is reasonable to assume that the biological effects depend to a large extent on the
coupling of the hand to the vibration source. It should also be noted that the coupling can affect considerably the
vibration magnitudes measured.
The vibration measurements shall be made with forces which are representative of the coupling of the hand to the
vibrating power tool, handle or workpiece in typical operation of the tool or process.
1)
Forces between the hand and gripping zone should be measured and reported. It is also recommended that a
description of the operator's posture be reported for individual conditions and/or operating procedures (see
annexes D and F).
4.4 Quantity to be measured
The primary quantity used to describe the magnitude of the vibration shall be the root-mean-square (r.m.s.)
2
frequency-weighted acceleration expressed in metres per second squared (m/s ).
The measurement of frequency-weighted acceleration requires the application of a frequency weighting and band-
limiting filters. The frequency weighting W reflects the assumed importance of different frequencies in causing
h
injury to the hand. The characteristics of the W frequency weighting and methods for band-limiting are given in
h
annex A.
...
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