SIST EN ISO 22868:2011

Forestry and gardening machinery - Noise test code for portable hand-held machines with internal combustion engine - Engineering method (Grade 2 accuracy) (ISO 22868:2011)

This International Standard specifies a noise test code for determining, efficiently and under standardized conditions, the noise emission characteristics of portable, hand held, internal combustion engine powered forestry and garden machines including chain-saws, brush-cutters, grass-trimmers, pole-mounted powered pruners, hedge trimmers and garden blowers. Noise emission characteristics include the A weighted emission sound pressure level at the operator position and the A weighted sound power level.

Forst- und Gartenmaschinen - Geräuschmessnorm für handgehaltene Maschinen mit Verbrennungsmotor - Verfahren der Genauigkeitsklasse 2 (ISO 22868:2011)

Diese Internationale Norm legt ein Geräuschmessverfahren zur effizienten Ermittlung der Geräuschemissionsdaten
von tragbaren handgeführten forstwirtschaftlichen Maschinen und Gartengeräten mit Verbrennungsmotor
unter einheitlichen Bedingungen fest. Hierzu gehören Kettensägen, Freischneider, Grastrimmer, motorbetriebene
Hochentaster, Heckenscheren und Laubbläser/Sauger. Die zu ermittelnden Geräuschemissions-
Kennwerte sind der A-bewertete Emissions-Schalldruckpegel am Ort der Bedienungsperson und der
A-bewertete Schallleistungspegel.

Machines forestières et machines de jardin - Code d'essai acoustique pour machines portatives tenues à la main à moteur à combustion interne - Méthode d'expertise (classe de précision 2) (ISO 22868:2011)

L'ISO 22868:2011 spécifie un code d'essai acoustique pour déterminer, avec efficacité et dans des conditions normalisées, les caractéristiques acoustiques d'émission des machines forestières et des machines de jardin portatives tenues à la main à moteur à combustion interne, telles que les scies à chaîne, les débroussailleuses, les coupe-herbe, les perches élagueuses à moteur, les taille-haies et les souffleurs/aspirateurs de jardin. Les caractéristiques acoustiques d'émission comprennent le niveau de pression acoustique d'émission pondéré A au poste de travail et le niveau de puissance acoustique pondéré A.

Gozdarski in vrtnarski stroji - Standard za meritev hrupa ročno vodenih strojev, gnanih z motorjem z notranjim zgorevanjem - Postopek meritve (razred natančnosti 2) (ISO 22868:2011)

Ta mednarodni standard opredeljuje standard za meritev hrupa za določevanje, učinkovito in pod standardiziranimi pogoji, značilnosti emisij hrupa prenosnih ročnih gozdarskih in vrtnarskih strojev z motorjem z notranjim izgorevanjem, vključno z verižnimi žagami, žagami za nego, motornimi kosami, motornimi žagami za obvejevanje z drogom, škarjami za živo mejo in vrtnimi pihalniki. Značilnosti emisij hrupa vključujejo uteženo raven A emisij zvočnega tlaka na položaju upravljavca in uteženo raven moči zvoka A.

General Information

• Status: Withdrawn
• Public Enquiry End Date: 24-Jul-2009
• Publication Date: 13-Sep-2011
• Withdrawal Date: 15-Apr-2021
• ICS: 17.140.20 - Noise emitted by machines and equipment
• ICS: 65.060.80 - Forestry equipment
• Technical Committee: IMKG - Machinery for agriculture and forestry
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 08-Apr-2021
• Due Date: 01-May-2021
• Completion Date: 16-Apr-2021
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Directive: 98/37/EC - Machinery
• Mandate: M/079 - Mandate to CEN and CENELEC for standardization in the field of machines
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Ref Project: EN ISO 22868:2011 - Forestry and gardening machinery - Noise test code for portable hand-held machines with internal combustion engine - Engineering method (Grade 2 accuracy) (ISO 22868:2011)

Relations

• Revised: SIST EN ISO 22868:2007 - Forestry machinery - Noise test code for portable hand-held machines with internal combustion engine - Engineering method (Grade 2 accuracy) (ISO 22868:2005, corrected version 2005-06-01)
• Effective Date: 22-Dec-2008
• Replaced By: SIST EN ISO 22868:2021 - Forestry and gardening machinery - Noise test code for portable hand-held machines with internal combustion engine - Engineering method (Grade 2 accuracy) (ISO 22868:2021)
• Effective Date: 07-Apr-2021
• Replaces: SIST EN ISO 22868:2009 - Forestry machinery - Noise test code for portable hand-held machines with internal combustion engine - Engineering method (Grade 2 accuracy) (ISO 22868:2005)
• Effective Date: 01-Sep-2011
• Replaces: SIST ISO 10884:1996 - Manually portable brush-cutters and grass-trimmers with internal combustion engine -- Determination of sound power levels -- Engineering method (Grade 2)
• Effective Date: 01-Oct-2011
• Revised: SIST EN ISO 22868:2021 - Forestry and gardening machinery - Noise test code for portable hand-held machines with internal combustion engine - Engineering method (Grade 2 accuracy) (ISO 22868:2021)
• Effective Date: 12-Oct-2016
• Replaces: SIST EN ISO 22868:2009 - Forestry machinery - Noise test code for portable hand-held machines with internal combustion engine - Engineering method (Grade 2 accuracy) (ISO 22868:2005)
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 22868:2011
01-oktober-2011
1DGRPHãþD
SIST EN ISO 22868:2009
*R]GDUVNLLQYUWQDUVNLVWURML6WDQGDUG]DPHULWHYKUXSDURþQRYRGHQLKVWURMHY
JQDQLK]PRWRUMHP]QRWUDQMLP]JRUHYDQMHP3RVWRSHNPHULWYHUD]UHG
QDWDQþQRVWL,62
Forestry and gardening machinery - Noise test code for portable hand-held machines
with internal combustion engine - Engineering method (Grade 2 accuracy) (ISO
22868:2011)
Forst- und Gartenmaschinen - Geräuschmessnorm für handgehaltene Maschinen mit
Verbrennungsmotor - Verfahren der Genauigkeitsklasse 2 (ISO 22868:2011)
Machines forestières et machines de jardin - Code d'essai acoustique pour machines
portatives tenues à la main à moteur à combustion interne - Méthode d'expertise (classe
de précision 2) (ISO 22868:2011)
Ta slovenski standard je istoveten z: EN ISO 22868:2011
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
65.060.80 Gozdarska oprema Forestry equipment
SIST EN ISO 22868:2011 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 22868:2011

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SIST EN ISO 22868:2011


EUROPEAN STANDARD
EN ISO 22868

NORME EUROPÉENNE

EUROPÄISCHE NORM
March 2011
ICS 17.140.20; 65.060.80; 13.140 Supersedes EN ISO 22868:2008
English Version
Forestry and garden machinery - Noise test code for portable
hand-held machines with internal combustion engine -
Engineering method (Grade 2 accuracy) (ISO 22868:2011)
Machines forestières et machines de jardin - Code d'essai Forst- und Gartenmaschinen - Geräuschmessnorm für
acoustique pour machines portatives tenues à la main à handgehaltene Maschinen mit Verbrennungsmotor -
moteur à combustion interne - Méthode d'expertise (classe Verfahren der Genauigkeitsklasse 2 (ISO 22868:2011)
de précision 2) (ISO 22868:2011)
This European Standard was approved by CEN on 15 January 2011.

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 CEN-CENELEC 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 CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 22868:2011: E
worldwide for CEN national Members.

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SIST EN ISO 22868:2011
EN ISO 22868:2011 (E)
Contents Page
Foreword .3
Annex ZA .4

2

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SIST EN ISO 22868:2011
EN ISO 22868:2011 (E)
Foreword
This document (EN ISO 22868:2011) has been prepared by Technical Committee ISO/TC 23 "Tractors and
machinery for agriculture and forestry" in collaboration with Technical Committee CEN/TC 144 “Tractors and
machinery for agriculture and forestry” the secretariat of which is held by AFNOR.
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 September 2011, and conflicting national standards shall be
withdrawn at the latest by September 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 22868:2008.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 22868:2011 has been approved by CEN as a EN ISO 22868:2011 without any modification.
3

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SIST EN ISO 22868:2011
EN ISO 22868:2011 (E)
Annex ZA
(informative)

Relationship between this European Standard and
the Essential Requirements of EU Directive 2006/42/EC

This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide one means of conforming to Essential Requirements of
the New Approach Directive 2006/42/EC on machinery.

Once this standard is cited in the Official Journal of the European Union under that Directive and has been
implemented as a national standard in at least one Member State, compliance with the normative clauses of
this standard confers, within the limits of the scope of this standard, a presumption of conformity with the
Essential Requirement 1.7.4.2 u) of that Directive and associated EFTA regulations.

WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling
within the scope of this standard.
4

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SIST EN ISO 22868:2011

INTERNATIONAL ISO
STANDARD 22868
Second edition
2011-03-01

Forestry and gardening machinery —
Noise test code for portable hand-held
machines with internal combustion
engine — Engineering method (Grade 2
accuracy)
Machines forestières et machines de jardin — Code d'essai acoustique
pour machines portatives tenues à la main à moteur à combustion
interne — Méthode d'expertise (classe de précision 2)




Reference number
ISO 22868:2011(E)
©
ISO 2011

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SIST EN ISO 22868:2011
ISO 22868:2011(E)
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©  ISO 2011
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Published in Switzerland

ii © ISO 2011 – All rights reserved

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SIST EN ISO 22868:2011
ISO 22868:2011(E)
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 Quantities to be measured and quantities to be determined.2
5 A-weighted sound power level determination.2
6 A-weighted emission sound pressure level measurement at the operator position .3
7 Testing and operating conditions.4
8 Information to be reported.5
9 Declaration and verification of noise emission values .8
Annex A (normative) Specific conditions for chain saws .10
Annex B (normative) Specific conditions for brush cutters and grass-trimmers.14
Annex C (normative) Specific conditions for pole-mounted powered pruners .19
Annex D (normative) Specific conditions for hedge-trimmers .23
Annex E (normative) Specific conditions for garden blower/vacuum .27
Annex F (informative) Example of water brake mounted on chain saw bar to simulate cutting.32
Annex G (informative) Summary of results from round robin tests 2007/2008 on single chain saw,
brush saw and grass-trimmer .34
Annex H (informative) A-weighted sound power level declaration according to the EU Directive on
noise emission in the environment by equipment for use outdoors, 2000/14/EC.35

© ISO 2011 – All rights reserved iii

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SIST EN ISO 22868:2011
ISO 22868:2011(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 2.
The main task of technical committees is to prepare International Standards. 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 document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 22868 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and
forestry, Subcommittee SC 17, Manually portable forest machinery.
This second edition cancels and replaces the first edition (ISO 22868:2005), which has been technically
revised. It now also deals with pole-mounted powered pruners, hedge-trimmers and garden blowers/vacuums.
iv © ISO 2011 – All rights reserved

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SIST EN ISO 22868:2011
ISO 22868:2011(E)
Introduction
1)
This document is a type-C standard as stated in ISO 12100.
The machinery concerned and the extent to which hazards, hazardous situations or hazardous events are
covered are indicated in the Scope of this document.
When requirements of this type-C standard are different from those which are stated in type-A or B standards,
the requirements of this type-C standard take precedence over the requirements of the other standards for
machines that have been designed and built according to the requirements of this type-C standard.
During the first steps in the preparation of this International Standard it became obvious that the repeatability
of the test results could become better if the operator were to be replaced by a simulation process,
representing the normal operating modes with chain-saws and trimmers/brush-cutters. Furthermore, it was
found that the cutting process performed with chain-saws causes considerable deviations, which are not
related to the measured object but to the test procedure itself.
Based on these observations, it was concluded that the operators in both test procedures, i.e. for chain-saws
and trimmers/brush-cutters, ought to be replaced by a defined fixture and the cutting process with chain-saws
by a brake simulating the load. In this manner, the operating conditions during measurement would simulate
normal operating conditions.
The determination of noise emission characteristics is primarily intended for
⎯ manufacturers' declarations of noise emitted,
⎯ comparing the noise emitted by machines in the family concerned, and
⎯ purposes of noise control at source at the design stage.
The use of this noise test code will ensure reproducibility of the determination of the noise emission
characteristics within specified limits determined by the grade of accuracy of the basic noise measurement
method used. Noise measurement methods allowed by this International Standard give results with Grade 2
accuracy.
The operating modes specified for the tests are consistent with those involved in the assessment of the
exposure sound pressure levels, for example, over a typical working day.
NOTE Exposure sound pressure levels are the mean sound pressure levels experienced by the operator over a
defined period of time.
The work cycles chosen for this test code are based on the following considerations of application:
3
a) chain-saws with an engine of < 80 cm are used for various operations, including felling, bucking and
delimbing;
3
b) chain-saws with an engine of W 80 cm are normally used for felling and bucking.
Delimbing will cause the saw to run at racing speed; therefore, racing is included only for saws with a
3
< 80 cm engine.

1) Safety of machinery — General principles for design — Risk assessment and risk reduction.
© ISO 2011 – All rights reserved v

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SIST EN ISO 22868:2011
ISO 22868:2011(E)
For brush-cutters, grass-trimmers, hedge-trimmers and pole-mounted powered pruners, the cutting mode (full
load) is estimated to be valid only for short periods, while racing and idling are the two dominant modes.
Moreover, it has also been found to be diverse and not able to be performed under repeatable conditions.
For trimmers, the full load and the racing modes are integrated in one single mode due to the loading effect of
the flexible line.
For brush-cutters, hedge-trimmers and pole-mounted powered pruners, it is not possible to simulate the full
load mode in a feasible way since there are no constant load conditions comparable to chain-saws. Since the
operating mode “racing” is anyhow the worst case, it is used as representative.
For garden blowers, full load and idling are the two dominant modes.
In either case, transport and other tasks between operations will cause the machine to run at idling.
Experience has lead to the conclusion that, except for hedge-trimmers and blowers, equal duration for the
different working modes is a good estimation of daily exposure.
For hedge-trimmers, experience has shown that the machine is used 1/5 at idling and 4/5 at racing, while for
garden blowers it is used 1/7 at idling and 6/7 at racing.
A summary of results from “round robin” tests, carried out between 2007 and 2008 in up to eight test
laboratories on a single chain-saw, brush-saw and grass-trimmer, is given in Annex G.

vi © ISO 2011 – All rights reserved

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SIST EN ISO 22868:2011
INTERNATIONAL STANDARD ISO 22868:2011(E)

Forestry and gardening machinery — Noise test code for
portable hand-held machines with internal combustion
engine — Engineering method (Grade 2 accuracy)
CAUTION — Some of the test procedures specified in this International Standard involve processes
that could lead to a hazardous situation. Any person performing tests in accordance with this
International Standard shall be appropriately trained in the type of work to be carried out.
1 Scope
This International Standard specifies a noise test code for determining, efficiently and under standardized
conditions, the noise emission characteristics of portable, hand-held, combustion-engine-powered forest and
garden machines, including chain-saws, brush-cutters, grass-trimmers, pole-mounted powered pruners,
hedge-trimmers and garden blowers/vacuums. Noise emission characteristics include the A-weighted
emission sound pressure level at the operator position and the A-weighted sound power level.
2 Normative references
The following referenced documents are indispensable for the application 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 354, Acoustics — Measurement of sound absorption in a reverberation room
ISO 3744, Acoustics — Determination of sound power levels and sound energy levels of noise sources using
sound pressure — Engineering methods for an essentially free field over a reflecting plane
ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and
equipment
ISO 6531, Machinery for forestry — Portable chain-saws — Vocabulary
ISO 7112, Machinery for forestry — Portable brush-cutters and grass-trimmers — Vocabulary
ISO 7293, Forestry machinery — Portable chain saws — Engine performance and fuel consumption
ISO 8893, Forestry machinery — Portable brush-cutters and grass-trimmers — Engine performance and fuel
consumption
ISO 11201, Acoustics — Noise emitted by machinery and equipment — Determination of emission sound
pressure levels at a work station and at other specified positions in an essentially free field over a reflecting
plane with negligible environmental corrections
IEC 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications
© ISO 2011 – All rights reserved 1

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SIST EN ISO 22868:2011
ISO 22868:2011(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6531 and ISO 7112 apply.
4 Quantities to be measured and quantities to be determined
The quantities to be measured are the time-averaged sound pressure levels defined in the relevant basic
noise measurement standards (ISO 3744, ISO 11201), A-weighted and — if required — in frequency bands.
The quantities to be determined are the sound power levels and the emission sound pressure levels,
A-weighted and — if required — in frequency bands.
5 A-weighted sound power level determination
For the determination of the A-weighted sound power level, ISO 3744 shall be used, subject to the following
modifications or additions.
a) The microphone array shall be six microphone positions, in accordance with Figure 1 and Table 1.
NOTE 1 The six-microphone array is permitted because experimental data have shown that use of this array does
not yield results that differ significantly from those obtained with the 10-microphone array specified in ISO 3744.
b) The measurement surface shall be a hemisphere with a radius, r, of W 2d , preferably 4 m; d is
O O
determined by the reference box and its defined location above ground, see Figure 1. If a bigger radius is
needed it shall be chosen from 6 m, 8 m and 10 m. A smaller radius is permitted if it is demonstrated that
the results are within 0,5 dB compared with measurements with a hemisphere of r = 4 m.
NOTE 2 The smaller radius could be necessary in an anechoic room where a radius of 4 m cannot be provided.
c) The conditions for the particular type of machine to be tested and its mounting and orientation shall be
according to the corresponding annex of this International Standard.
d) Environmental conditions shall be within the limits specified by the manufacturer of the measuring
equipment. The ambient air temperature shall be in the range −10 °C to 30 °C and the wind speed shall
be less than 5 m/s. A microphone windscreen shall be used whenever the wind speed exceeds 1 m/s.
e) Measurements shall be made using an integrating-averaging sound level meter as defined in
IEC 61672-1; alternatively, instruments with the time-weighting characteristics “slow”, as defined in
IEC 61672-1, may be used.
f) The value of K , determined in accordance with ISO 3744:2010, Annex A, shall at maximum be 2 dB.
2A
2 © ISO 2011 – All rights reserved

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SIST EN ISO 22868:2011
ISO 22868:2011(E)
z
y
5
2
6
1
3
d
O
4
A
r
x

Key
A reference box
d characteristic source dimension
O
r hemisphere radius W 2d
O
Figure 1 — Microphone positions on hemisphere
Table 1 — Coordinates of microphone positions
Coordinate
Position no.
x y z
1 + 0,65 r + 0,65 r 0,38 r
2 − 0,65 r + 0,65 r 0,38 r
3 − 0,65 r − 0,65 r 0,38 r
4 + 0,65 r − 0,65 r 0,38 r
5 − 0,28 r + 0,65 r 0,71 r
6 + 0,28 r − 0,65 r 0,71 r

NOTE See also Annex H concerning the microphone positions.
6 A-weighted emission sound pressure level measurement at the operator position
6.1 General
For the measurement of the A-weighted emission sound pressure level, ISO 11201 shall be used, subject to
the following modifications and additions.
a) The conditions for the particular type of machine to be tested and its mounting shall be in accordance with
the corresponding annex of this International Standard.
© ISO 2011 – All rights reserved 3

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SIST EN ISO 22868:2011
ISO 22868:2011(E)
b) The surface shall comply with the provisions of either 6.2 or 6.3. Reproducibility of results using natural
grass or other organic material is likely to be worse than that required for Grade 2 of accuracy. In case of
dispute, measurements shall be carried out in the open air and on the artificial surface (see 6.2).
c) Environmental conditions shall be within the limits specified for the measuring equipment. The ambient air
temperature shall be in the range −10 °C to 30 °C, and the wind speed shall be less than 5 m/s. A
microphone windscreen shall be used whenever the wind speed exceeds 1 m/s.
d) Measurements shall be made using an integrating-averaging sound level meter as defined in
IEC 61672-1; alternatively, instruments with the time-weighting characteristics “slow”, as defined in
IEC 61672-1, may be used.
e) The location of a particular type of machinery respective to the microphone array shall be in accordance
with the corresponding annex of this International Standard.
6.2 Requirements for artificial surface
The artificial surface shall have absorption coefficients in accordance with Table 2, measured according to
ISO 354.
Table 2 — Absorption coefficient
Frequencies
Absorption coefficients Tolerance
Hz
125 0,1 ± 0,1
250 0,3 ± 0,1
500 0,5 ± 0,1
1 000 0,7 ± 0,1
2 000 0,8 ± 0,1
4 000 0,9 ± 0,1

The artificial surface shall be placed on a hard, reflecting surface at the centre of the test environment and
shall have a size of at least 3,6 m × 3,6 m. The construction of the supporting structure shall be such that the
requirements for acoustic properties are met with the absorptive material in place. The structure shall support
the test set-up such that compression of the absorbing material is avoided.
6.3 Requirements for natural ground surface
The ground at the centre of the test site shall be flat and have good sound-absorbing properties. The surface
shall be either forest ground or grass, with the grass or other organic material having a height of (50 ± 20) mm.
7 Testing and operating conditions
Measurements shall be carried out on a new, normal production machine fitted with standard equipment in
accordance with the instruction handbook.
The engine and the machine shall be run-in prior to the test in accordance with the manufacturer's instructions.
The engine shall be at normal stable operating temperature before the test is started.
The carburettor shall be set to give the specific machine conditions required by the corresponding annex of
this standard.
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SIST EN ISO 22868:2011
ISO 22868:2011(E)
The cutting devices shall be lubricated in accordance with the instruction handbook. No alterations to the initial
settings are permitted once measurements have commenced.
An engine speed indicator shall be used to check the speed of the engine. It shall have a measurement
uncertainty of ± 1,0 % of the reading. The indicator and its engagement with the machine shall not affect the
operation during testing.
NOTE 1 The specific conditions for a particular machine are given in the corresponding annexes.
Noise emission quantities shall be determined under the specific conditions for the particular type of machine
specified in the corresponding annex. The following additionally applies.
a) Perform a minimum of four measurements with a short break and significant change of speed between
each measurement. Separate each measurement at, for example, idle, by a short period of racing, and
vice versa. After this speed variation, stable speed conditions shall be obtained before testing is
continued.
At least four separate periods of noise data shall be obtained, totalling at least 20 s.
Each signal duration used shall be at least 2 s over which the engine speed is within ± 3,5 r/s.
NOTE 2 The collection of data for the different operating modes need not be carried out in any fixed sequence.
b) The range of all values noted for each operating mode shall not be greater than 2 dB. If this range is
exceeded, repeat the tests until four consecutive results fall within a range of 2 dB. The final value to be
retained for each microphone position is the arithmetical mean of these four successive values satisfying
this requirement.
For all the conditions specified in the annexes, carry out this procedure when measuring the A-weighted
emission sound pressure levels. When determining the A-weighted sound power level, this procedure shall be
applied to the sound pressure levels averaged over the six microphone positions.
8 Information to be reported
The following information, as applicable, shall be recorded and reported for all measurements:
a) machine under test:
1) description of the machine (including its engine displacement, manufacturer, type and serial number,
and cutting attachment);
2) operating conditions, as listed in Tables 3 and 4, during acoustical evaluation;
3) dimensions of the log (when applicable);
b) acoustic environment (description of test environment):
1) if outdoors, a sketch showing the location of the machine with respect to the surrounding terrain,
including a physical description of the test environment including a description of the nature of the
ground plane;
2) if indoors, a description of the physical treatment of walls, ceiling and floor, including a sketch
showing the location of the machine and room contents;
3) value of K ;
2A
© ISO 2011 – All rights reserved 5

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SIST EN ISO 22868:2011
ISO 22868:2011(E)
c)
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