EN ISO 4869-4:2000
(Main)Acoustics - Hearing protectors - Part 4: Measurement of effective sound pressure levels for level-dependent sound-restoration ear-muffs (ISO/TR 4869-4:1998)
Acoustics - Hearing protectors - Part 4: Measurement of effective sound pressure levels for level-dependent sound-restoration ear-muffs (ISO/TR 4869-4:1998)
The standard specifies methods for measuring sound attenuation of amplitude sensitive hearing protectors valid for relevant sound pressure levels at normal exposure to noises.
Akustik - Gehörschützer - Teil 4: Messung der wirksamen Schalldruckpegel von Kapselgehörschützern mit pegelabhängiger elektroakustischer Übertragungseinrichtung (ISO/TR 4869-4:1998)
Dieser Fachbericht legt ein physikalisches Meßverfahren für Kapselgehör- schützer mit pegelabhängiger elektroakustischer Übertragungseinrichtung fest.Die physikalischen Messungen werden mit der akustischen Prüfvorrichtung (acoustic test fixture, "ATF") nach ISO/TR 4869-3 oder mit einem geeigneten Kopf-und-Rumpf-Simulator (head and torso simulator, "HATS") mit ausreichender Schalldämmung durchgeführt.
Acoustique - Protecteurs individuels contre le bruit - Partie 4: Mesurage des niveaux effectifs de pression acoustique des serre-têtes destinés à la restitution du son (ISO/TR 4869-4:1998)
Le présent Rapport technique spécifie une méthode d'essai physique pour les serre-tête destinés à la restitution du son.Les mesurages physiques sont effectués à l'aide du dispositif d'essai acoustique conformément à l'ISO/TR 4869-3 ou à l'aide d'un simulateur de tête et de torse (STET) approprié avec un isolement acoustique adéquat (voir article 7). Les résultats de ces essais, ainsi que les résultats issus des essais de l'ISO 4869-1, peuvent être utilisés pour évaluer le niveau de pression acoustique pondéré A en cas d'utilisation de serre-tête destinés à la restitution du son.La méthode décrite dans le présent document n'est pas applicable au mesurage du niveau effectif de pression acoustique des serre-tête dans le cas de serre-tête destinés à la réduction de bruit impulsif ou actif.
Akustika - Oprema za varovanje sluha - 4. del: Merjenje efektivnih ravni zvočnega tlaka za varovalne naušnike glede na razred zaščite (ISO/TR 4869-4:1998)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2001
$NXVWLND2SUHPD]DYDURYDQMHVOXKDGHO 0HUMHQMHHIHNWLYQLKUDYQL]YRþQHJD
WODND]DYDURYDOQHQDXãQLNHJOHGHQDUD]UHG]DãþLWH ,6275
Acoustics - Hearing protectors - Part 4: Measurement of effective sound pressure levels
for level-dependent sound-restoration ear-muffs (ISO/TR 4869-4:1998)
Akustik - Gehörschützer - Teil 4: Messung der wirksamen Schalldruckpegel von
Kapselgehörschützern mit pegelabhängiger elektroakustischer Übertragungseinrichtung
(ISO/TR 4869-4:1998)
Acoustique - Protecteurs individuels contre le bruit - Partie 4: Mesurage des niveaux
effectifs de pression acoustique des serre-tetes destinés a la restitution du son (ISO/TR
4869-4:1998)
Ta slovenski standard je istoveten z: EN ISO 4869-4:2000
ICS:
13.340.20 Varovalna oprema za glavo Head protective equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
TECHNICAL ISO/TR
REPORT 4869-4
First edition
1998-10-01
Acoustics — Hearing protectors —
Part 4:
Measurement of effective sound pressure
levels for level-dependent sound-restoration
ear-muffs
Acoustique — Protecteurs individuels contre le bruit —
Partie 4: Mesurage des niveaux effectifs de pression acoustique des serre-
tête destinés à la restitution du son
A
Reference number
ISO 4869-4:1998(E)
ISO/TR 4869-4:1998(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.
The main task of technical committees is to prepare International
Standards, but in exceptional circumstances a technical committee may
propose the publication of a Technical Report of one of the following types:
— type 1, when the required support cannot be obtained for the
publication of an International Standard, despite repeated efforts;
— type 2, when the subject is still under technical development or where
for any other reason there is the future but not immediate possibility
of an agreement on an International Standard;
— type 3, when a technical committee has collected data of a different
kind from that which is normally published as an International
Standard (“state of the art”, for example).
Technical Reports of types 1 and 2 are subject to review within three years
of publication, to decide whether they can be transformed into International
Standards. Technical Reports of type 3 do not necessarily have to be
reviewed until the data they provide are considered to be no longer valid or
useful.
ISO/TR 4869-4, which is a Technical Report of type 2, was prepared by
Technical Committe ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.
© ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii
© ISO
ISO/TR 4869-4:1998(E)
A first CD 4869-4, doc. 43/1 N 924, based on a miniature micro-
phone technique, was circulated for comments in the period
1994-06-30/1994-09-30. The comments, given in doc. 43/1 N 948, showed
that such a draft could not be expected to obtain sufficient support. WG 17
then prepared a completely revised draft based on a simplified procedure
and using an artificial test fixture (ATF) which was circulated as a second
CD, doc. 43/1 N 972, in the period 1995-01-01/1995-03-10.
The comments given in doc. 43/1 N 985, showed that the second
CD 4869-4 did not have major support either. WG 17 therefore prepared a
revised document, still based on the ATF but with the scope restricted to
sound restoration ear-muffs which was circulated as a Draft Technical
Report, doc. 43/1 N 986, in the period 1995-10-10/1996-01-10. The votes
and comments, given in doc. 43/1 N 1039, showed 16 approvals and 4
disapprovals.
Based on these comments, WG 17 prepared a second draft Technical
Report 4869-4, doc. 43/1 N 1069, which was circulated for voting in the
period 1997-05-15/1997-08-20 and approved with 15 approvals and 2
disapprovals as given in doc. 43/1 N 1148. The two disapprovals were
requesting a technique based on the use of miniature microphones which
cannot be incorporated in the present document. Thus, the second TR,
with some editorial amendments, is issued as a Technical Report, and the
question of the preparation of a possible standard based on a miniature
microphone technique must be the subject of a separate discussion and
decision in ISO/TC 43/SC 1.
ISO 4869-4 consists of the following parts, under the general title
Acoustics — Hearing protectors:
— Part 1: Subjective method for the measurement of sound attenuation
— Part 2: Estimation of effective A-weighted sound pressure levels
when hearing protectors are worn
— Part 3: Simplified method for the measurement of insertion loss of
ear-muff type protectors for quality inspection purposes
— Part 4: Measurement of effective sound pressure levels for level-
dependent sound-restoration ear-muffs
Annex A of this part of ISO 4869 is for information only.
iii
© ISO
ISO/TR 4869-4:1998(E)
Introduction
Measurement of sound attenuation according to ISO 4869-1 is intended for
conventional, passive hearing protectors where the attenuation is in-
dependent of the level of the noise outside the hearing protector. Hearing
protectors with level-dependent operation are also available. Such oper-
ation is usually obtained by means of electro-acoustic components. The
level-dependent characteristics of such protectors cannot be determined
using the procedures of ISO 4869-1. The present technical report provides
a physical method for the determination of the characteristics of level-
dependent sound restoration ear-muffs. The passive sound attenuation
characteristics of sound restoration ear-muffs should be measured in
accordance with ISO 4869-1.
iv
TECHNICAL REPORT © ISO ISO/TR 4869-4:1998(E)
Acoustics — Hearing protectors —
Part 4:
Measurement of effective sound pressure levels for level-dependent
sound-restoration ear-muffs
1 Scope
This Technical Report specifies a physical test method for level-dependent sound-restoration ear-muffs. The
physical measurements are made with the acoustic test fixture (ATF) according to ISO/TR 4869-3 or with a suitable
head and torso simulator (HATS) with a suitable acoustic isolation (see clause 7). The results of these tests in
combination with the results from the ISO 4869-1 tests can be used to estimate the effective A-weighted sound
pressure level when sound restoration ear-muffs are worn.
The method described is not suitable for measurement of the effective sound pressure level under ear-muffs in the
case of impulsive noise nor for active noise reduction ear-muffs.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 4869. 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 4869 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 IEC and ISO maintain
registers of currently valid International Standards.
ISO 4869-1:1990, Acoustics — Hearing protectors — Part 1: Subjective method for the measurement of sound
attenuation.
ISO 4869-2, Acoustics — Hearing protectors — Part 2: Estimation of effective A-weighted sound pressure levels
when hearing protectors are worn.
ISO/TR 4869-3:1989, Acoustics — Hearing protectors — Part 3: Simplified method for the measurement of insertion
loss of ear-muff type protectors for quality inspection purposes.
IEC 60651,
Sound level meters.
IEC 61094-4, Measurement microphones — Part 4: Specifications for working standard microphones.
IEC 61260, Electroacoustics — Octave-band and fractional-octave-band filters.
© ISO
ISO/TR 4869-4:1998(E)
3 Terms and definitions
For the purposes of this Technical Report, the terms and definitions given in ISO 4869-1, ISO 4869-2 and
ISO/TR 4869-3, and the following apply.
3.1
reference microphone
calibrated microphone meeting the requirements for WS2D microphones given in IEC 61094-4, not located in the
acoustic test fixture, which is used to measure sound pressure levels in the test chamber
3.2
reference point
location in the test chamber to which all acoustical measurements are referred, and at which the midpoint of a line
connecting the centres of the two end faces of the acoustic test fixture is located
3.3
sound-restoration ear-muff
sound-transmission ear-muff
ear-muff intended to reproduce external sounds wit
...
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