oSIST prEN ISO 20643:2026

• Abstract:

  ISO 20643:2005 provides the basis for the drafting of vibration test codes for hand-held and hand-guided power-driven machinery. It specifies the determination of hand-transmitted vibration emission in terms of frequency-weighted root-mean-square (r.m.s.) acceleration during type testing. For machines where vibration test codes do not exist, it can also be used for determination of emission values and contains sufficient guidance for designing an appropriate test. It is applicable to hand-held power tools (e.g. chipping hammers, sanders), hand-guided powered machines (e.g. lawn mowers, single-axle tractors, vibratory rollers), and other types of powered machines fitted with handles, guiding beams or similar means of control, of all power sources (electrical, hydraulic, pneumatic, internal combustion engine, etc.). It is not applicable to fixed machinery in which the vibration is transmitted to the hands of the user through the workpiece, nor to vibration transmitted from steering wheels or control levers of mobile machinery where the operator's position is on the machine.

• Status: Not Published
• Public Enquiry End Date: 14-Sep-2026
• ICS: 13.160 - Vibration and shock with respect to human beings
• ICS: 25.080.01 - Machine tools in general
• ICS: 25.140.01 - Hand-held tools in general
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 15-Jul-2026
• Due Date: 02-Dec-2026
• Completion Date: 15-Sep-2026
• Directive: 2023/1230 - Regulation (EU) 2023/1230 of the European Parliament and of the Council of 14 June 2023 on machinery and repealing Directive 2006/42/EC of the European Parliament and of the Council and Council Directive 73/361/EEC (Text with EEA relevance)
• Mandate: M/605 - COMMISSION IMPLEMENTING DECISION of 20.1.2025 on a standardisation request to the European Committee for Standardization and to the European Committee for Electrotechnical Standardization as regards machinery and related products in support of Regulation (EU) 2023/1230 of the European Parliament and of the Council
• Ref Project: prEN ISO 20643 - Mechanical vibration - Hand-held and hand-guided machinery - Principles for evaluation of vibration emission (ISO/DIS 20643:2026)

• Revises: SIST EN ISO 20643:2008/A1:2013 - Mechanical vibration - Hand-held and hand-guided machinery - Principles for evaluation of vibration emission - Amendment 1: Accelerometer positions (ISO 20643:2005/Amd 1:2012)
• Effective Date: 11-Dec-2024
• Revises: SIST EN ISO 20643:2008 - Mechanical vibration - Hand-held and hand-guided machinery - Principles for evaluation of vibration emission (ISO 20643:2005)
• Effective Date: 11-Dec-2024

oSIST prEN ISO 20643:2026 is a SIST draft standard on mechanical vibration for hand-held and hand-guided machinery. It sets the principles for evaluating vibration emission during type testing, including how to measure hand-transmitted continuous vibration and repeated shock vibration, and how to report the results.

The standard is aimed at people who need reproducible vibration data for a machine family - especially manufacturers, test laboratories, and standardization bodies preparing machine-specific vibration test codes.

What does oSIST prEN ISO 20643:2026 specify?

oSIST prEN ISO 20643:2026 specifies how to evaluate vibration emission from hand-held and hand-guided machinery during type testing. It also gives the basis for drafting vibration test codes for a specific family of machinery, which is important because those codes make test results comparable from one laboratory to another.

The standard applies to hand-held power tools, hand-guided powered machines, and other powered machines fitted with handles, guiding beams or similar control means. It covers all power sources named in the document, including electrical, hydraulic, pneumatic and internal combustion engine drive.

It does not apply to fixed machinery where vibration reaches the hand through the workpiece, or to mobile machinery where the operator’s position is on the machine.

Annex	What it covers
Annex A	Minimum information that a vibration test code shall include
Annex B	Possible sources of measurement error
Annex C	Procedure for developing a vibration test code for a specific family of machinery
Annex D	Model test report
Annex ZA	Relationship with Regulation (EU) 2023/1230

The document is organized into clauses on scope, normative references, terms and symbols, basic standards and vibration test codes, family description, vibration characterisation, instrumentation, testing conditions, measurement procedure and validity, and the measurement report.

What are the key requirements of oSIST prEN ISO 20643:2026?

Test codes and machine definition

oSIST prEN ISO 20643:2026 puts the vibration test code at the centre of the method. Clause 4 states that a vibration test code shall be based on this standard, and that it shall contain enough detail to make determination and declaration of vibration emission efficient and comparable.

• The code shall identify the machine family or type and its range of application.
• It shall name any inserted tools, accessories or consumables that affect vibration.
• It shall state the operating conditions, measurement directions, transducer positions, and the number and qualification of operators.

In practice, this means the test code has to lock down the machine configuration and test setup so another lab can repeat the same test and judge the same product in the same way.

How vibration is measured

Clause 6 separates the measurement approach into continuous vibration and repeated shock vibration. Continuous vibration is expressed as the frequency-weighted r.m.s. acceleration a_hw, while repeated shock vibration is expressed as the vibration peak magnitude of the flat acceleration p_F.

• Measurements are taken in the x, y and z directions, simultaneously when possible.
• Measurement points shall be on or near the grip surface, close to where the operator normally holds the machine.
• If both hands are used, both hand positions shall be measured and recorded.
• The transducer shall be rigidly attached and placed as close as possible to the surface.

This matters because grip position, hand contact and transducer placement can change the measured value. The standard therefore tries to make the measurement representative, but also repeatable.

Instrumentation, weighting and timing

Clause 7 requires vibration measurement equipment to conform to ISO 8041-1. It also specifies the weighting and timing used for the measurement.

• W frequency weighting is used for continuous vibration.
• Flat frequency weighting is used for repeated shock vibration.
• Linear time averaging is used for both outputs.
• The integration time shall be set in the vibration test code and should normally be at least 8 s for hand-transmitted vibration measurements.

Clause 7 also requires the whole measurement chain to be checked before and after a measurement sequence with a calibrator. In practice, that means the lab has to control the measurement system, not only the machine under test.

Operating conditions, operators and validity

Clause 8 requires the machine to be tested in specified operating conditions that are representative of normal use and, where possible, the highest vibration likely in typical use.

• The test code shall specify accessories, inserted tools, workpiece and task.
• If the machine has several configurations, the highest values from all configurations used according to the instructions for use shall be reported.
• Measurements shall be carried out by at least three skilled operators, unless the test code justifies one operator.
• The working procedure should be based on a single task phase or a working cycle, and should be reproducible.

Clause 9 then defines the test series and acceptance logic. Unless the test code says otherwise, three series of five consecutive tests are carried out, with a different operator for each series. The continuous-vibration result is accepted when the coefficient of variation is low enough or the standard deviation is small enough, and the report shall give the mean values and their uncertainties.

Reporting and declaration

Clause 10 defines what the measurement report shall include, such as the machine identification, accessories, operating conditions, instrumentation, transducer position, measured values, uncertainties and unusual observations. Clause 9 also ties declaration to EN 12096:2026, which matters because declared emission values have to be presented in a consistent way.

What terms does oSIST prEN ISO 20643:2026 define?

• Family of machinery - machinery of similar design or type intended to do the same function, which is the group the test code applies to.
• Hand-guided machinery - machinery guided by the operator’s hands, with vibration transmitted through handles or other control elements.
• Hand-held machinery - powered machinery held in the hand and requiring feed force to do the task.
• Inserted tool - a replaceable attachment that fits into or onto the machine to perform the operation, such as a drill bit or saw blade.
• Accessories - interchangeable attachments other than an inserted tool, used to complete the machine, such as side handles.
• Operation - the identified task or working cycle for which a representative vibration value is measured.
• Instrumentation - the vibration measuring chain made up of transducer, signal processor and display.

Who uses oSIST prEN ISO 20643:2026?

oSIST prEN ISO 20643:2026 is used by machine manufacturers, test laboratories, and technical standardization committees preparing type-C standards for specific machine families. It is also relevant to health and safety bodies, market surveillance, accident prevention organizations, and other users who need comparable vibration emission values for machinery safety work.

Manufacturers use it to prepare declared vibration emission values and the associated test reports. Laboratories use it to run repeatable type tests. Buyers, employers, and service providers use the declared values to compare machines and understand the test basis behind them.

What changed in oSIST prEN ISO 20643:2026 from the previous edition?

oSIST prEN ISO 20643:2026 cancels and replaces ISO 20643:2005 including Amd 1:2012. The foreword lists these main changes:

• the introduction has been clarified and aligned with B-standard introductions;
• the scope has been clarified and reorganized for readability;
• repeated shock vibration values have been added as a second emission value;
• hand-transmitted vibration emission is now split into continuous vibration and repeated shock vibration emission;
• Annex D has been added;
• references have been updated;
• editorial changes were made to meet ISO Directives.

Which standards are used with oSIST prEN ISO 20643:2026?

• ISO 5349-1:2001 - provides general requirements for measuring and evaluating human exposure to hand-transmitted vibration.
• ISO 5349-2:2001 - gives practical guidance for workplace measurement.
• ISO 5349-3:2025 - covers isolated and repeated shocks and supplies terms, definitions and symbols used here.
• ISO 8041-1:2017 - sets the requirements for general-purpose vibration meters and the measurement chain.
• EN 12096:2026 - governs declaration and verification of vibration emission values.

What does the oSIST prEN ISO 20643:2026 document contain?

The document contains the measurement principles, the formulas used to combine axis measurements into overall values, and the validity checks for test series. It also gives the minimum information that a machine-specific vibration test code shall include.

Annex C is especially practical: it describes how to develop a test code from real-use information, including the choice of representative task, machine configuration, accessories and operating conditions. Annex D provides a model test report with tables for one machine, including the recorded values for continuous vibration and repeated shock vibration.

Annex B is a short guide to common measurement errors, such as incorrect transducer mounting, poor cable fastening, wrong operating conditions, short measurement time, or unstable machine operation. Annex ZA links the document to the essential requirements of Regulation (EU) 2023/1230 for instructions for use.

SLOVENSKI STANDARD
01-september-2026
Mehanske vibracije - Prenosni ročni in ročno vodeni stroji - Načela vrednotenja
oddajanja vibracij (ISO/DIS 20643:2026)
Mechanical vibration - Hand-held and hand-guided machinery - Principles for evaluation
of vibration emission (ISO/DIS 20643:2026)
Mechanische Schwingungen - Handgehaltene und handgeführte Maschinen -
Grundsätzliches Vorgehen bei der Ermittlung der Schwingungsemission (ISO/DIS
20643:2026)
Vibration mécanique - Machines tenues et guidées à la main - Principes pour l'évaluation
d'émission vibratoire (ISO/DIS 20643:2026)
Ta slovenski standard je istoveten z: prEN ISO 20643
ICS:
13.160 Vpliv vibracij in udarcev na Vibration and shock with
ljudi respect to human beings
25.080.01 Stroji na splošno Machine tools in general
25.140.01 Ročna orodja na splošno Hand-held tools in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 20643
ISO/TC 118/SC 3
Mechanical vibration — Hand-
Secretariat: SIS
held and hand-guided machinery
Voting begins on:
— Principles for evaluation of
2026-07-01
vibration emission
Voting terminates on:
2026-09-23
Vibration mécanique — Machines tenues et guidées à la main —
Principes pour l'évaluation d'émission de vibration
ICS: 25.140.01; 13.160
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 20643:2026(en)
DRAFT
ISO/DIS 20643:2026(en)
International
Standard
ISO/DIS 20643
ISO/TC 118/SC 3
Mechanical vibration — Hand-
Secretariat: SIS
held and hand-guided machinery
Voting begins on:
— Principles for evaluation of
vibration emission
Voting terminates on:
Vibration mécanique — Machines tenues et guidées à la main —
Principes pour l'évaluation d'émission de vibration
ICS: 25.140.01; 13.160
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
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NOTIFICATION OF ANY RELEVANT PATENT
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Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 20643:2026(en)
ii
ISO/DIS 20643:2026(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
3.1 Terms and definitions .2
3.2 Symbols .3
4 Basic standards and vibration test codes . 4
5 Description of a family of machinery . 4
6 Characterization of vibration . . 5
6.1 Direction of measurement .5
6.2 Location of measurement .6
6.3 Mounting of transducer .6
6.4 Vibration emission .7
6.4.1 Continuous vibration emission .7
6.4.2 Repeated shock vibration emission .7
7 Instrumentation requirements . 8
7.1 General .8
7.2 Specification of transducer .8
7.3 Frequency weighting filter .9
7.3.1 W frequency weighting .9
h
7.3.2 flat frequency weighting . .9
h
7.4 Time averaging .9
7.5 Integration time .9
7.6 Check and verification of the measurement chain .9
7.7 Auxiliary accessories .9
8 Testing and operating conditions of the machinery . 9
8.1 General .9
8.2 Operating conditions and task .10
8.3 Other quantities to be specified .10
8.4 Attached accessories, workpiece .10
8.5 Operator .10
9 Measurement procedure and validity .10
9.1 Measurement procedure .10
9.2 Validity .11
9.3 Reported vibration values .11
9.4 Declaration of the vibration emission values .11
10 Measurement report .11
Annex A (normative) Minimum information to be given in the vibration test code .13
Annex B (informative) Possible sources of errors during vibration measurements .15
Annex C (normative) Procedure for developing a vibration test code for a specific family of
hand-held or hand-guided machinery .16
Annex D (informative) Model test report . 17
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Regulation (EU) 2023/1230 aimed to be covered .20
Bibliography .22

iii
ISO/DIS 20643:2026(en)
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 118, Compressors and pneumatic tools, machines
and equipment, Subcommittee SC 3, Pneumatic tools and machines, in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 231, Mechanical vibration and shock, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 20643:2005 including Amd 1:2012), which
has been technically revised.
The main changes are as follows:
— introduction has been clarified and aligned with B-standard introductions;
— scope has been clarified by removing the second paragraph and restructuring the scope to increase the
readability;
— values for repeated shock vibrations are added as a second emission value;
— hand-transmitted vibration emission is divided into hand-transmitted continuous vibration and repeated
shock vibration emission;
— Annex D has been added;
— references have been updated;
— editorial changes to fulfil the ISO Directives.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
ISO/DIS 20643:2026(en)
Introduction
Human exposure to mechanical vibration from hand-held or hand-guided machinery can interfere with
comfort, working efficiency and, in some circumstances, health and safety. According to ISO 12100 the risks
created by vibrating machinery need to be minimized and the residual risk from vibration need to be noted
in the relevant instruction handbook. This, ideally, will be based on the vibration emission values reported
in accordance with this document or the relevant vibration test code, but additional information for use can
be required.
This document can be used for hand-held machinery (e.g. chipping hammers, sanders), hand-guided
machinery (e.g. lawn mowers, single-axle tractors, vibratory rollers) and other types of machinery fitted
with handles, guiding beams or similar means of control. It can be used for machinery of all power sources
(electrical, hydraulic, pneumatic, internal combustion engine, etc.).
It is possible that not all of the mechanisms that generate vibration when the machinery is used in the real
operational environment are identify by the type test method. Factors such as the workpiece, the process
and the operator can have an important influence on the vibration magnitudes. For this reason, the type test
measurements cannot replace field measurements for evaluating vibration exposure at the workplace, but
they are sufficiently representative to be used for a preliminary assessment of risk.
Vibration magnitudes in type tests are kept within the range of measurements made in the field, but
with less variability. Type tests require accurate and reproducible conditions. It is essential that different
laboratories obtain the same results within specified limits. This requires that the process or way in which
the machinery is measured is precisely defined.
This document is intended to assist technical standardization committees responsible for specific types of
machinery in preparing vibration test codes to ensure that such vibration test codes:
— enable users to make comparisons and to check the declared vibration emission values;
— are as homogeneous as possible with each individual test code having the same basic structure;
— are in full accordance with basic type-B standards on measurement of vibration emissions;
— reflect the latest technical knowledge of methods of determining the vibration emissions from the
specific family of machinery under consideration.
A vibration test code for a family of machinery prepared in accordance with this document:
a) produces vibration emission data which allow the determination of the vibration state-of-the-art for
a family of machinery and the identification of a machinery which has significantly greater or smaller
vibration emission;
b) produces vibration emission values and uncertainties suitable for comparing the emissions of machinery
of the same type irrespective of the date or location of the testing;
c) produces vibration emission values and uncertainties corresponding to the upper quartile of vibration
magnitudes resulting from intended uses of the machinery;
d) specifies the operating conditions of the machinery during testing that are, so far as practicable,
representative of normal use;
e) identifies parameters that have a significant influence on the vibration emission of the machinery;
f) specifies installation and mounting conditions of transducers, measurement positions and measurement
directions;
g) prescribes accessories used during testing and
h) requires recording of the values of machinery operating parameters that may influence vibration
emission.
v
ISO/DIS 20643:2026(en)
This document can be used, in the absence of an agreed vibration test code, as a guide to determine vibration
emission values and to define test parameters that may influence vibration emission to be recorded.
This document is a type-B standard as stated in ISO 12100.
This document is of relevance, in particular, for the following stakeholder groups representing the market
players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);
— health and safety bodies (regulators, accident prevention organizations, market surveillance etc.);
Others can be affected by the level of machinery safety achieved with the means of the document by the
above-mentioned stakeholder groups:
— machinery users/employers (small, medium and large enterprises);
— machinery users/employees (e.g. trade unions, organizations for people with special needs);
— service providers, e.g. for maintenance (small, medium and large enterprises);
— consumers (in case of machinery intended for use by consumers).
The above-mentioned stakeholder groups have been given the possibility to participate at the drafting
process of this document.
In addition, this document is intended for standardization bodies elaborating type-C standards.
The requirements of this document can be supplemented or modified by a type-C standard.
For machinery that are covered by the scope of a type-C standard and have been designed and built according
to the requirements of that standard, the requirements of that type-C standard take precedence.
This document does not present limits or recommended vibration values. It does not give any guidance or
recommendations for determination of human exposure to vibration at the workplace. For such information,
see ISO 5349-1 and ISO 5349-2.

vi
DRAFT International Standard ISO/DIS 20643:2026(en)
Mechanical vibration — Hand-held and hand-guided
machinery — Principles for evaluation of vibration emission
1 Scope
This document provides the basis for the drafting of vibration test codes for hand-held and hand-guided
machinery. It specifies the determination of hand-transmitted continuous vibration and repeated shock
vibration emission values during type testing. For machinery where vibration test codes do not exist, it may
also be used for determination of vibration emission values and contains sufficient guidance for designing
an appropriate test.
This document does not apply
— to fixed machinery in which the vibration is transmitted to the hand-arm system through the workpiece,
and,
— to mobile machinery where the operator's position is on the machine, see EN 1032.
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.
ISO 5349-1:2001, Mechanical vibration — Measurement and evaluation of human exposure to hand-transmitted
vibration — Part 1: General requirements
ISO 5349-2:2001, Mechanical vibration — Measurement and evaluation of human exposure to hand-transmitted
vibration — Part 2: Practical guidance for measurement at the workplace
ISO 5349-3:2025, Mechanical vibration — Measurement and evaluation of human exposure to hand-transmitted
vibration — Part 3: Isolated and repeated shocks using the frequency range of ISO 5349-1
ISO 8041-1:2017, Human response to vibration — Measuring instrumentation — Part 1: General purpose
vibration meters
EN 12096:2026, Mechanical vibration — Declaration and verification of vibration emission values
3 Terms, definitions and symbols
For the purposes of this document, the terms and definitions given in ISO 5349-3 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/

ISO/DIS 20643:2026(en)
3.1 Terms and definitions
3.1.1
family of machinery
machinery of similar design or type, intended to perform the same functions
EXAMPLE chain-saws
3.1.2
hand-guided machinery
machinery, which is guided by the operator with his hands, such that the vibration exposure is obtained
through the handles or other control elements
EXAMPLE walk-behind cutting machine, swing grinder
[SOURCE: ISO 5349-2:2001, 3.1.2 modified: steering wheel changed to other control elements, other
examples are given]
3.1.3
hand-held machinery
powered machinery which is held in the hand and for which a feed force is necessary to fulfil a task
EXAMPLE electric drill, pneumatic chisel, chain-saw
3.1.4
inserted tool
interchangeable or replaceable attachment which fits into or onto hand-held or hand-guided machinery for
performing the intended operation
EXAMPLE drill bit, chisel, saw chain, saw blade, abrasive wheel
3.1.5
accessories
specific interchangeable attachments other than an inserted tool to complete the machinery
EXAMPLE side handles
3.1.6
operation
identified task for which a representative vibration magnitude measurement is made; this may be for a
single phase of a task or a working cycle, that means a set of tool operations which are necessary to fulfil a
task
3.1.7
operator
person using a hand-held or hand-guided machinery
3.1.8
tool operation
any period during which a hand-held or hand-guided machinery is operating, and the operator is being
exposed to hand-transmitted vibration
[SOURCE: ISO 5349-2:2001, 3.1.8]
3.1.9
workpiece
item being operated upon by a hand-held or hand-guided machinery
[SOURCE: ISO 5349-2:2001, 3.1.9]

ISO/DIS 20643:2026(en)
3.1.10
instrumentation
vibration measuring instrumentation
combination of a vibration transducer, signal processor and display, being any single instrument, or a
collection of instruments, which is/are capable of measuring parameters relating to human response to
vibration
[SOURCE: ISO 8041-1:2017, 3.1.1.13/modified, instrumentation added and Note 1 to entry is removed]
3.1.11
consumables
expendable items that are essential for the operation of the machinery, e.g. nails and staples
3.2 Symbols
In this document, the following symbols are used.
a (t), a (t), instantaneous single-axis acceleration value of the flat weighted vibration in the axes de-
Fx Fy h
a (t) noted as x, y and z (m/s )
Fz
a (t) instantaneous tri-axial acceleration total value of the flat weighted vibration (m/s ) as
Fv h
specified in ISO 5349-3:2025, 3.2.9
p vibration peak magnitude (VPM) of the flat acceleration defined as the square root ratio of
F h
th th 2
6 power acceleration sum to 4 power acceleration sum (m/s ) as specified in ISO 5349-
3:2025, Clause 4.
arithmetic mean value of the p measurement results of consecutive tests and operators, in
p
F
F
m/s
a (t) instantaneous single-axis acceleration value of the W frequency-weighted hand-transmit-
hw h
ted vibration at time t, in m/s
a root-mean-square (r.m.s.) single-axis acceleration value of the W frequency-weighted hand
hw h
transmitted vibration, in m/s
a a a values of a in 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, in m/s ; it is the root-sum-
hv
of-squares of the a values for the three measured axes of vibration
hw
arithmetic mean value of the a measurement results of consecutive tests and operators, in
a
hv
hv
m/s
K uncertainty for continuous vibrations in m/s
a
KS1,645
aa N1

K uncertainty for repeated shock vibrations in m/s
p
KS1,645
pp N1

ISO/DIS 20643:2026(en)
C coefficient of variation of a test series for continuous vibrations, defined as the ratio of the
Va
standard deviation of a series of measurement values and the mean value of the series:
S
aN1

C 
Va
a
hv
where
1 N
S  aa is the standard deviation


aN1 hvi hv
i1
N1
a is the mean value of the series in m/s
hv
a is the i-th value measured in m/s
hvi
N is the number of measured values
C coefficient of variation of a test series for repeated shock vibrations, defined as the ratio of
Vp
the standard deviation of a series of measurement values and the mean value of the series:
S
pN1

C 
Vp
p
F
where
1 N
S  pp is the standard deviation


pN1 FFi
i1
N1
p is the mean value of the series in m/s
F
p is the i-th value measured in m/s
Fi
N is the number of measured values
4 Basic standards and vibration test codes
The preparation of vibration test codes for hand-held and hand-guided machinery shall be based on the
requirements of this document. A vibration test code is a type-C standard relative to a specified family
or sub-family or type of machinery. It shall give all the information necessary to carry out efficiently the
determination and declaration of the vibration emission values. It shall ensure compatibility and allow
comparison of test results. Annex A provides a minimum list of items that shall be dealt with in vibration
test codes.
Where no specific vibration test codes exist for a family of machinery, this document may be used as a test
code. In such cases details of the measurement method and machine operation (see Clauses 6, 7 and 8) shall
be fully reported.
5 Description of a family of machinery
The family or type of machinery covered by the vibration test code shall be described unambiguously and in
detail.
In describing the configuration of the machinery, a vibration test code shall:
— identify any inserted tools used in the operation of the machinery under test and which may influence
the vibration emission;
— specify the selection of other accessories or consumables which may influence the vibration emission,
and which shall be used during the determination of vibration emission;
— identify the range of applications for which the vibration test code is intended.

ISO/DIS 20643:2026(en)
6 Characterization of vibration
6.1 Direction of measurement
Translational vibration transmitted to the hand is related to the x, y or z directions shown in Figure 1. For a
family of machinery, these directions of vibration measurement shall be defined in the vibration test code.
NOTE Other directions of vibration (e.g. rotational motion) are not dealt with in this document.
Measurements shall be made simultaneously in three directions for each measurement position.
If, in some cases, it is not possible due to technical reasons to make vibration measurements in three axes,
the vibration test code may specify that measurements are made only in one or two axes, but the axis of
greatest vibration shall be included (where this can be identified).
a) "Handgrip" position
(In this position, the hand grips a cylindrical hand grip)

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