EN 61252:1995
(Main)Electroacoustics - Specifications for personal sound exposure meters
Electroacoustics - Specifications for personal sound exposure meters
Applies to instruments for measurement of A-frequency- weighted sound exposure resulting from steady, intermittent, fluctuating, irregular, or impulsive sound. Specifies acoustical and electrical performance requirements for personal sound exposure meters of one accuracy grade.
Elektroakustik - Anforderungen an Personenschallexposimeter
Electroacoustique - Spécifications des exposimètres acoustiques individuels
S'applique aux instruments de mesure de l'exposition sonore pondérée A en fréquence et résultant de sons stables, intermittents, fluctuants, irréguliers, ou impulsifs. Donne les prescriptions concernant les caractéristiques acoustiques et électriques des exposimètres acoustiques individuels correspondant à une seule classe de précision.
Electroacoustics - Specifications for personal sound exposure meters (IEC 61252:1993)
1.1 Izpostavljenost zvoku je fizikalni kazalnik, ki se uporablja za zvočni tlak in trajanje zvoka na določenem mestu na podlagi sestavnega prekoračenja kvadrata trenutnega frekvenčno-vrednotenega zvočnega tlaka.
1.2 Ta mednarodni standard se uporablja za instrumente za merjenje frekvenčno-vrednotene izpostavljenosti zvoku zaradi neprekinjenih, občasnih, nihajočih, spremenljivih ali impulzivnih zvokov. Instrumenti, skladni s specifikacijami tega mednarodnega standarda, so namenjeni za merjenje izpostavljenosti zvoku pri osebah, ki jih nosijo.
Meritve izpostavljenosti zvoku na delovnem mestu so lahko uporabne za ugotavljanje izpostavljenosti hrupu pri delu v skladu s standardoma ISO 1999 in ISO 9612.
1.3 Ta mednarodni standard določa zahteve glede akustičnih in električnih zmogljivosti za merilnike osebne izpostavljenosti zvoku z enotnim razredom točnosti. Razred točnosti ustreza razredu točnosti za merilnik integracijske zvočne jakosti, ki izpolnjuje zahteve tipa 2 v skladu s standardom IEC 804 za A-vrednoteno raven zvočnega tlaka v obsegu od 80 dB do 130 dB in nazivnem frekvenčnem obsegu od 63 Hz do 8 kHz.
1.4 Tolerance pri odstopanjih v zmogljivosti instrumenta od podanih načrtovanih ciljev predstavljajo učinkovitosti delovanja praktičnih instrumentov. Merilniki osebne izpostavljenosti zvoku morajo delovati znotraj toleranc iz tega mednarodnega standarda v okviru podanih okoljskih pogojev.
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SLOVENSKI STANDARD
01-april-2000
Electroacoustics - Specifications for personal sound exposure meters (IEC
61252:1993)
Electroacoustics - Specifications for personal sound exposure meters
Elektroakustik - Anforderungen an Personenschallexposimeter
Electroacoustique - Spécifications des exposimètres acoustiques individuels
Ta slovenski standard je istoveten z: EN 61252:1995
ICS:
13.140 Vpliv hrupa na ljudi Noise with respect to human
beings
17.140.50 Elektroakustika Electroacoustics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
NORME EUROPEENNE
EUROPAISCHE NORM March 1995
ICS 17.1 40.50
Descriptors: Electroacoustic equipment, exposure meters, sound pressure, definitions, indicating instruments, specifications,
characteristics, instrument sensitivity, marking, technical notices
English version
Electroacoustics
Specifications for personal sound exposure meters
(IEC 1252: 1993)
Electroacoustique Elektroakustik
Specifications des exposim6tres Anforderungen an
acoustiques individuels Personenschallexposimeter
(CEI 1 252: 1 993) (IEC 1252: 1993)
This European Standard was approved by CENELEC on 1995-03-06. CENELEC members are bound to
comply with the CENICENELEC 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 Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). Aversion in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland,
France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain,
Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comitk Europken de Normalisation Electrotechnique
Europaisches Komitee fur Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
1995 Copyright reserved to CENELEC members
Ref. No. EN 61252:1995 E
Page 2
EN 61 252: 1995
Foreword
The text of the International Standard IEC 1252:1993, prepared by IEC TC 29,
Electroacoustics, was submitted to the formal vote and was approved by CENELEC as
EN 61 252 on 1995-03-06 without any modification.
The following dates were fixed:
- latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 1995-1 2-1 5
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 1995-1 2-1 5
Annexes designated "normative1' are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex ZA is normative and annexes A and B are informative.
Annex ZA has been added by CENELEC.
Endorsement notice
The text of the International Standard IEC 1252:1993 was approved by CENELEC as a
European Standard without any modification.
ANNEX ZA (normative)
OTHER INTERNATIONAL PUBLICATIONS QUOTED IN THIS STANDARD
WITH THE REFERENCES OF THE RELEVANT EUROPEAN PUBLICATIONS
7h1s Europeijn Standard incorporate:; by dated or untlated refer'c?ncu, pr.ovis lons
from other publications. These normative references are cited at the
iippropriate places in the text and the publicat~ons arc listed hereafter. For
dated references, subsequent amendments t.o or revisions ol' any of these
publications apply to this Europe
amendment or revision. For undated references t.he latest edition of the
publ~cdtion referred to applies.
NOTE : When the internnational publlcat.ion has been modified by CtNtLEC
common mod ~f ications, indicated by (mod), the relevdnt ENIHD applies.
I LC
Pub'I icatior~ Date '[itle
- . - - - . . - - -. - . . . . ,. . . . , .- . - - -
50(801) 1984 International Electrotechnical
Vocabulary (IEV) . Chapter 801:
Acoustics and electro--acoustics
65 1. 1919 Pound level meters IN bOfj51 1994
801 -2 1984 Electromagnetic compatibility for EN 60801-2 1993
industrial-process measurement dnd
control equipment - Part 2:
Electrostdtic discharge requirements
801- 3 1984 Part 3: Radiated electromagnetic field HLI 481.3 S1. 1987
requirements
HI14 1985 Integrating-averaging sound level meters EN 60804% 1994
94 % 1.388 Sound calibrators IiD 556 S1 '1. 13 1 1.
Other pub l i~ations:
- - - - - - - - - . . - .
IS0 26h:1975 - Acoustics - Preferred frequencies for measurements
IS0 '1683: 138:3 -- Ar:oust ics - Preferred r.cfer.en(;e quarlt rt ics for ,j(:our;t:c levc 1.;
IS0 19913:1990 - Acoustits - Determination of occupat.iona1 noise explosure anti
cS,l imat ion of nolie ~nduced hclir inq imp~l iraenl
150 9612:199x - Acoustics - Guidelines for the measurement and assessment of
exposure to noise in the work ~ng environment ( In prepdrdt ]on)
. . . - - - - . . . . . . . - .
* EN 60804 -1nc-ludes A1:1989 to IEC 804
NORME CEI
IEC
INTERNATIONALE
INTERNATIONAL
édition
Première
STAN DARD
First edition
1993-06
Electroacoustique —
des exposimètres
Spécifications
acoustiques individuels
Electroacoustics —
Specifications for personal sound
exposure meters
de reproduction réservés — Copyright — all rights reserved
© CEI 1993 Droits
No part of this publication may be reproduced or utilized in
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1252 ©IEC:1993 - 3 -
CONTENTS
Page
FOREWORD
INTRODUCTION
Clause
1 Scope
2 Normative references
3 Definitions
4 General pe rformance requirements
5 Reference conditions 19
6 Absolute acoustical sensitivity
7 Frequency weighting
8 Linearity of response to steady signals
9 Response to short-duration signals
10 Response to unipolar pulses
11 Latching overload indicator
12 Sensitivity to various environments
13 Instrument marking
29 14 Instruction Manual
Design-goal A-frequency weighting relative to response at 1 kHz
Table 1
rformance of a complete
and the tolerances DA that apply to the pe
21 personal sound exposure meter
Figure 1 Functional elements of a personal sound exposure meter
Annexes
Sound exposures and corresponding normalized 8-h-average
A
sound levels
rformance of a personal
B Recommended tests to verify the pe
sound exposure meter
Tables
A.1 Sound exposures and corresponding normalized 8-h-average
sound levels
B.1 Minimum set of target conditions for 1 kHz steady-signal
linearity tests
B.2 Conditions for testing response to short-duration signals
1252 ©IEC:1993 - 5 -
INTERNATIONAL ELECTROTECHNICAL COMMISSION
ELECTROACOUSTICS -
SPECIFICATIONS FOR PERSONAL SOUND EXPOSURE METERS
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to
promote international cooperation on all questions concerning standardization in the electrical and
electronic fields. To this end and in addition to other activities, the IEC publishes International Standards.
Their preparation is entrusted to technical committees; any IEC National Committee interested in
the subject dealt with may participate in this preparatory work. International, governmental and
non -governmental organizations liaising with the IEC also participate in this preparation. The IEC
collaborates closely with the Inte rnational Organization for Standardization (ISO) in accordance with
conditions determined by agreement between the two organizations.
The formal decisions or agreements of the IEC on technical matters, prepared by technical committees on
2)
which all the National Committees having a special interest therein are represented, express, as nearly as
possible, an international consensus of opinion on the subjects dealt with.
They have the form of recommendations for international use published in the form of standards, technical
3)
reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
International Standard IEC 1252 has been prepared by IEC technical committee 29:
Electroacoustics.
The text of this standard is based on the following documents:
Report on Voting
DIS
29(CO)162 29(CO)168
Full information on the voting for the approval of this Standard can be found in the Repo rt
on Voting indicated in the above table.
Specifications in this International Standard for personal sound exposure meters are
consistent, insofar as practical, with comparable specifications in IEC 804 for integrating
sound level meters. The four principal technical differences from the specifications in the
1985 issue of IEC 804 are:
sound exposure is measured and displayed rather than equivalent-continuous
a)
frequency-weighted sound pressure level or sound exposure level;
b) accuracy of squaring and integrating short-duration signals is specified by measure-
ment of the sound exposure of a sequence of repeated constant-amplitude, 1 ms
and 10 ms duration, 4 kHz tonebursts rather than by measurement of the response
– 7 –
1252 ©IEC:1993
to single 4 kHz tonebursts of varying amplitudes with durations ranging from 1 ms to
1 s, each single toneburst being accompanied by a continuous, in-phase, low-level,
4 kHz background signal;
specifications for a personal sound exposure meter include a limitation on the differ-
c)
ence between the sound exposure indicated in response to positive-going and
negative-going unipolar pulses; and
d) requirements are not specified for the directional response of the microphone of a
personal sound exposure meter intended to be worn on a person.
This International Standard includes two informative annexes. Annex A provides a table of
selected sound exposures and corresponding normalized 8-h-average sound levels.
Annex B describes recommendations for tests to verify the performance of a personal
sound exposure meter.
INTRODUCTION
According to this International Standard, a personal sound exposure meter is intended to
measure sound exposure as the time integral of the square of the instantaneous
A-frequency-weighted sound pressure. This operating principle underlies the measure-
ment of sound exposure level according to IEC 804. It is the "equal-energy exchange rate"
whereby a doubling (or halving) of the integration time of a constant sound level yields a
two-fold increase (or decrease) of sound exposure. Similarly, an increase (or decrease) of
3 dB in a constant input sound level for a constant integration time yields a doubling
(or halving) of the sound exposure.
Noise dose meters usually have been designed to indicate noise dose as a percentage of
a legal limit. The limit and its definition vary from country to country and are subject to
change. To facilitate international comparison of sound exposure records with numerical
values of convenient magnitude, this International Standard specifies an instrument that
indicates sound exposure in pascal-squared hours. An indication of sound exposure with
a unit other than pascal-squared hours is permitted provided the manufacturer specifies a
procedure for converting the indication to pascal-squared hours, for example, a display of
"dose" as a fraction or a percentage of a specified sound exposure in pascal-squared
hours.
The principal application for a personal sound exposure meter is the measurement of
sound exposure in the vicinity of a person's head; e.g., for assessment of potential hearing
impairment according to Standards such as ISO 1999. The microphone of a personal
sound exposure Meter may be worn on the shoulder, collar, or other location close to one
ear. For many practical situations, such as in a factory where the sound-incidence angle
may vary widely during the course of workday, the sound exposure indicated by an
instrument worn on a person is likely to be different from that which would be measured in
the absence of the person. The influence of the person wearing a personal sound
exposure meter should be considered when estimating the sound exposure that would
have been measured with the person absent.
-g-
1252 ©IEC:1993
ELECTROACOUSTICS -
SPECIFICATIONS FOR PERSONAL SOUND EXPOSURE METERS
1 Scope
1.1 Sound exposure is a physical measure that accounts for both the sound pressure
and its duration, at a given location, through an integral-over-time of the square of instan-
taneous frequency-weighted sound pressure.
1.2 This International Standard is applicable to instruments for measurement of
A-frequency-weighted sound exposure resulting from steady, intermittent, fluctuating,
irregular, or impulsive sounds. Instruments complying with the specifications of this Inter-
national Standard are intended to be worn on a person to measure sound exposure.
Measurements of sound exposure in the workplace may be useful for determinations of
occupational noise exposure, in accordance with
...
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