SIST EN 61672-1:2004
(Main)Electroacoustics - Sound level meters -- Part 1: Specifications
Electroacoustics - Sound level meters -- Part 1: Specifications
Gives electroacoustical performance specifications for three kinds of sound measuring instruments: - a conventional sound level meter that measures exponential time-weighted sound level; - an integrating-averaging sound level meter that measures time-average sound level; and - an integrating sound level meter that measures sound exposure level. A single instrument may make any, or all, of the three kinds of measurements. Two performance categories, class 1 and class 2, are specified in this standard. In general, specifications for class 1 and class 2 sound level meters have the same design goals and differ mainly in the tolerance limits and the range of operational temperatures. Tolerance limits for class 2 specifications are greater than, or equal to, those for class 1 specifications. Sound level meters conforming to the requirements of this standard have a specified frequency response for sound incident on the microphone from one principal direction in an acoustic free field or from random directions.
Elektroakustik - Schallpegelmesser -- Teil 1: Anforderungen
Electroacoustique - Sonomètres -- Partie 1: Spécifications
Donne des spécifications pour les caractéristiques électroacoustiques de trois types d'instruments de mesure acoustique: - le sonomètre conventionnel, qui mesure le niveau de pression acoustique avec une pondération temporelle exponentielle; - le sonomètre intégrateur-moyenneur, qui mesure le niveau continu équivalent de pression acoustique; - le sonomètre intégrateur, qui mesure le niveau d'exposition au bruit. Le même instrument peut effectuer un des types de mesure ou les trois. Deux catégories de caractéristiques correspondant à deux classes de sonomètres, la classe 1 et la classe 2, sont spécifiées dans la présente norme. Généralement, les spécifications concernant les sonomètres de classe 1 et de classe 2 correspondent aux mêmes caractéristiques nominales et ne diffèrent principalement que par les limites de tolérances et le domaine des températures de fonctionnement. Les limites de tolérance concernant les spécifications de la classe 2 sont supérieures ou égales à celles des spécifications de la classe 1. Les sonomètres conformes aux prescriptions de la présente norme présentent une réponse en fréquence spécifiée pour des ondes acoustiques incidentes sur le microphone suivant une direction principale dans un champ acoustique libre ou suivant des directions aléatoires.
Electroacoustics - Sound level meters - Part 1: Specifications (IEC 61672-1:2002)
General Information
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Standards Content (Sample)
SLOVENSKI SIST EN 61672-1:2004
STANDARD
julij 2004
Electroacoustics - Sound level meters - Part 1: Specifications (IEC 61672-1:2002)
ICS 17.140.50 Referenčna številka
SIST EN 61672-1:2004(en)
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
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EUROPEAN STANDARD EN 61672-1
NORME EUROPÉENNE
EUROPÄISCHE NORM February 2003
ICS 17.140.50 Parly supersedes EN 60651:1994 + A1:1994 + A2:2001 & EN 60804:2000
English version
Electroacoustics -
Sound level meters
Part 1: Specifications
(IEC 61672-1:2002)
Electroacoustique - Elektroakustik -
Sonomètres Schallpegelmesser
Partie 1: Spécifications Teil 1: Anforderungen
(CEI 61672-1:2002) (IEC 61672-1:2002)
This European Standard was approved by CENELEC on 2003-02-01. CENELEC 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 Central Secretariat or to any CENELEC 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 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61672-1:2003 E
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EN 61672-1:2003 - 2 -
Foreword
The text of document 29/507/FDIS, future edition 1 of IEC 61672-1, prepared by IEC TC 29,
Electroacoustics, in cooperation with the International Organization of Legal Metrology (OILM), was
submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61672-1 on
2003-02-01.
This European Standard, in conjunction with EN 61672-2, supersedes EN 60651:1994 + A1:1994 +
A2:2001 and EN 60804:2000.
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) 2003-11-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2006-02-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annexes A and ZA are normative and annexes B and C are informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61672-1:2002 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 61012 NOTE Harmonized as EN 61012:1998 (not modified).
IEC 61252 NOTE Harmonized as EN 61252:1995 (not modified).
IEC 60651 NOTE Harmonized as EN 60651:1994 (not modified).
IEC 60804 NOTE Harmonized as EN 60804:2000 (not modified).
__________
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- 3 - EN 61672-1:2003
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
CISPR 16-1 1999 Specification for radio disturbance - -
and immunity measuring apparatus
and methods
Part 1: Radio disturbance
and immunity measuring apparatus
1)
IEC 60050-801 - International Electrotechnical - -
Vocabulary (IEV)
Chapter 801: Acoustics and
electroacoustics
1)
IEC 60942 - Electroacoustics - Sound calibrators - -
1)
2)
IEC 61000-4-2 - Electromagnetic compatibility (EMC) EN 61000-4-2 1995
Part 4-2: Testing and measurement
techniques - Electrostatic discharge
immunity test
IEC 61000-6-2 1999 Part 6-2: Generic standards - Immunity EN 61000-6-2 2001
(mod) for industrial environments
ISO/IEC GUIDE 1995 Guide to the expression of uncertainty - -
EXPRES in measurement (GUM)
1)
ISO Publication - International vocabulary of basic and - -
ISBN 92-67- general terms in metrology
01075-1
1)
Undated reference.
2)
Valid edition at date of issue.
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NORME CEI
INTERNATIONALE IEC
61672-1
INTERNATIONAL
Première édition
STANDARD
First edition
2002-05
Electroacoustique –
Sonomètres –
Partie 1:
Spécifications
Electroacoustics –
Sound level meters –
Part 1:
Specifications
© IEC 2002 Droits de reproduction réservés ⎯ Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
CODE PRIX
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PRICE CODE
Commission Electrotechnique Internationale
International Electrotechnical Commission
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Pour prix, voir catalogue en vigueur
For price, see current catalogue
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61672-1 © IEC:2002 – 3 –
CONTENTS
FOREWORD.5
1 Scope.9
2 Normative references .11
3 Terms and definitions .11
4 Reference environmental conditions .21
5 Performance specifications.21
5.1 General .21
5.2 Adjustments to indicated levels .27
5.3 Directional response.29
5.4 Frequency weightings.31
5.5 Level linearity.39
5.6 Self-generated noise .41
5.7 Time weightings F and S .41
5.8 Toneburst response.43
5.9 Response to repeated tonebursts .47
5.10 Overload indication .47
5.11 Under-range indication .49
5.12 Peak C sound level .49
5.13 Reset .51
5.14 Thresholds .51
5.15 Display.51
5.16 Analogue or digital output.53
5.17 Timing facilities .53
5.18 Radio frequency emissions and disturbances to a public power supply.53
5.19 Crosstalk.55
5.20 Power supply.55
6 Environmental, electrostatic, and radio frequency criteria .57
6.1 General .57
6.2 Static pressure .57
6.3 Air temperature .57
6.4 Humidity.59
6.5 Electrostatic discharge .59
6.6 AC power frequency and radio frequency fields .59
7 Provision for use with auxiliary devices .63
8 Marking .63
9 Instruction manual .65
Annex A (normative) Maximum expanded uncertainties of measurement .75
Annex B (informative) AU weighting.77
Annex C (informative) Specifications for time-weighting I (impulse).79
Bibliography.85
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61672-1 © IEC:2002 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ELECTROACOUSTICS – SOUND LEVEL METERS –
Part 1: Specifications
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 International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each Technical Committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for informational use and are published in the
form of standards, technical specifications, technical 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.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61672-1 has been prepared by IEC technical committee 29:
Electroacoustics, in cooperation with the International Organization of Legal Metrology
(OIML).
This standard, in conjunction with IEC 61672-2, cancels and replaces IEC 60651, Sound level
meters, and IEC 60804, Integrating-averaging sound level meters.
The text of this standard is based on the following documents:
FDIS Report on voting
29/507/FDIS 29/515/RVD
Full information on the voting for the approval of this standard can be found in the report of
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
Annex A forms an integral part of this standard.
Annexes B and C are for information only.
At the time of publication of this standard, the IEC 61672 series was scheduled to consist at
least of the following parts: IEC 61672-1: Specifications, IEC 61672-2: Pattern evaluation
tests, and IEC 61672-3: Periodic tests.
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61672-1 © IEC:2002 – 7 –
The committee has decided that the contents of IEC 61672-1 will remain unchanged until
2005. At this date, the publication will be:
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
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61672-1 © IEC:2002 – 9 –
ELECTROACOUSTICS – SOUND LEVEL METERS –
Part 1: Specifications
1 Scope
1.1 This standard gives electroacoustical performance specifications for three kinds of
sound measuring instruments:
– a conventional sound level meter that measures exponential time-weighted sound level;
– an integrating-averaging sound level meter that measures time-average sound level; and
– an integrating sound level meter that measures sound exposure level.
A single instrument may make any, or all, of the three kinds of measurements. Additional
performance specifications are given for the measurement of maximum time-weighted sound
level and peak C sound level. Frequency-weighting A is mandatory for all sound level meters
specified in this standard.
1.2 Sound level meters conforming to the requirements of this standard have a specified
frequency response for sound incident on the microphone from one principal direction in an
acoustic free field or from random directions.
1.3 Sound level meters specified in this standard are intended to measure sounds generally
in the range of human hearing.
NOTE For measurement of audible sound in the presence of ultrasound, the AU weighting, specified in IEC 61012
1
[1], may be applied.
1.4 Two performance categories, class 1 and class 2, are specified in this standard. In
general, specifications for class 1 and class 2 sound level meters have the same design goals
and differ mainly in the tolerance limits and the range of operational temperatures. Tolerance
limits for class 2 specifications are greater than, or equal to, those for class 1 specifications.
1.5 This standard is applicable to a range of designs for sound level meters. A sound level
meter may be a self-contained hand-held instrument with an attached microphone and a built-
in display device. A sound level meter may be comprised of separate components in one or
more enclosures and may be capable of displaying a variety of acoustical signal levels. Sound
level meters may include extensive analogue or digital signal processing, separately or in
combination, with multiple analogue and digital outputs. Sound level meters may include
general-purpose computers, recorders, printers, and other devices that form a necessary part
of the complete instrument.
———————
1
Numbers in square brackets refer to the bibliography.
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61672-1 © IEC:2002 – 11 –
1.6 Sound level meters may be designed for use with an operator present or for automatic
and continuous measurements of sound level without an operator present. Specifications in
this standard for the response to sound waves apply without an operator present in the sound
field.
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.
2
CISPR 16-1:1999, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 1: Radio disturbance and immunity measuring apparatus
IEC 60050(801), International Electrotechnical Vocabulary – Chapter 801: Acoustics and
electroacoustics
IEC 60942, Electroacoustics – Sound calibrators
IEC 61000-4-2, Electromagnetic compatibility (EMC) – Part 4: Testing and measurement
techniques – Section 2: Electrostatic discharge immunity test. Basic EMC Publication
IEC 61000-6-2:1999, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards –
Immunity for industrial environments
ISO/IEC GUIDE EXPRES:1995, Guide to the expression of uncertainty in measurement
ISO Publication, ISBN 92-67-01075-1, International vocabulary of basic and general terms in
metrology
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in IEC 60050(801), the
International vocabulary of basic and general terms in metrology, the Guide to the expression
of uncertainty in measurement, and IEC 61000-6-2:1999, as well as the following apply. All
quantities are expressed in Sl units.
3.1
reference sound pressure
reference quantity conventionally chosen equal to 20 µPa for airborne sound
3.2
sound pressure level
twenty times the logarithm to the base ten of the ratio of the root-mean-square of a given
sound pressure to the reference sound pressure
NOTE Sound pressure level is expressed in decibels (dB); symbol L .
p
———————
2
In English, CISPR stands for International Special Committee on Radio Interference.
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61672-1 ” IEC:2002 – 13 –
3.3
frequency weighting
for a sound level meter, the difference between the level of the signal indicated on the display
device and the corresponding level of a constant-amplitude steady-state sinusoidal input
signal, specified in this standard as a function of frequency
NOTE The difference in level is expressed in decibels (dB).
3.4
time weighting
exponential function of time, of a specified time constant, that weights the square of the
instantaneous sound pressure
3.5
time-weighted sound level
twenty times the logarithm to the base ten of the ratio of a given root-mean-square sound
pressure to the reference sound pressure, root-mean-square sound pressure being obtained
with a standard frequency weighting and standard time weighting
NOTE 1 Time-weighted sound level is expressed in decibels (dB).
NOTE 2 For time-weighted sound level, example letter symbols are L , L , L , and L for frequency
AF AS CF CS
weightings A and C and time weightings F and S.
NOTE 3 In symbols, A-weighted and time-weighted sound level, L (t), at any instant of time t is represented by
AW
1/ 2
½t
°°
ªº2(t[W)/
Lt() 20 lg 1/W[p e d[ p (1)
®¾
AAW 0
³
«»f
¬¼
°°
¯¿
where
– W is the exponential time constant in seconds for time weighting F or S;
– [ is a dummy variable of time integration from some time in the past, as indicated by -f for the lower limit of
the integral, to the time of observation t;
– p ([) is the A-weighted instantaneous sound pressure; and
A
– p is the reference sound pressure.
0
In equation (1), the numerator of the argument of the logarithm is the exponential-time-weighted, root-mean-
square, frequency-weighted sound pressure at observation time t.
NOTE 4 The sketch in figure 1 illustrates the process indicated by equation (1).
Low-pass filter with
Square
Square one real pole at –1/W Logarithm
root
Result in decibels
Frequency
reference p
0
weighted
input
IEC 1082/02
Figure 1 – Principal steps involved in forming an exponential-time-weighted sound level
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61672-1 ” IEC:2002 – 15 –
3.6
maximum time-weighted sound level
greatest time-weighted sound level within a stated time interval
NOTE 1 Maximum time-weighted sound level is expressed in decibels (dB).
NOTE 2 For maximum time-weighted sound level, example letter symbols are L , L , L , and L
AFmax ASmax CFmax CSmax
for frequency weightings A and C and time weightings F and S.
3.7
peak sound pressure
greatest absolute instantaneous sound pressure during a stated time interval
3.8
peak sound level
twenty times the logarithm to the base ten of the ratio of a peak sound pressure to the
reference sound pressure, peak sound pressure being obtained with a standard frequency
weighting
NOTE 1 Peak sound level is expressed in decibels (dB).
NOTE 2 This standard provides specifications for measurement of peak C sound level; symbol L .
Cpeak
3.9
time-average sound level
equivalent continuous sound level
twenty times the logarithm to the base ten of the ratio of a root-mean-square sound pressure
during a stated time interval to the reference sound pressure, sound pressure being obtained
with a standard frequency weighting
NOTE 1 Time-average or equivalent continuous sound level is expressed in decibels (dB).
NOTE 2 In symbols, time-average, A-weighted sound level, L or L , is given by
T T
A Aeq
1/ 2
t
½
2
ªº
LL 20 lg 1/T p [[d p (2)
®¾
AATTeq A 0
³
«»tT
¬¼
¯¿
where
– [ is a dummy variable of time integration over the averaging time interval ending at the time of observation t;
– T is the averaging time interval;
– p ([) is the A-weighted instantaneous sound pressure; and
A
– p is the reference sound pressure.
0
In equation (2), the numerator of the argument of the logarithm is the root-mean-square, frequency-weighted sound
pressure over averaging time interval T.
NOTE 3 In principle, time weighting is not involved in a determination of time-average sound level.
3.10
sound exposure
time integral of the square of sound pressure over a stated time interval or event
NOTE 1 Duration of integration is included implicitly in the time integral and need not be reported explicitly,
although the nature of the event should be stated. For measurements of sound exposure over a specified time
interval such as 1 h, duration of integration should be reported.
NOTE 2 In symbols, A-weighted sound exposure E of a specified event is represented by
A
t
2
2
(3)
Ep ()tdt
AA
³
t
1
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61672-1 ” IEC:2002 – 17 –
2
where p (t) is the square of the A-weighted instantaneous sound pressure during an integration time starting at t
A 1
and ending at t .
2
The unit of A-weighted sound exposure is pascal-squared seconds if A-weighted sound pressure is in pascals and
running time is in seconds.
NOTE 3 Sound exposure in pascal-squared hours is more convenient for applications such as measurement of
exposure to noise in the workplace; see IEC 61252 [2].
3.11
sound exposure level
ten times the logarithm to the base ten of the ratio of a sound exposure to the reference
sound exposure, reference sound exposure being the product of the square of the reference
sound pressure and the reference time interval of 1 s
NOTE 1 Sound exposure level is expressed in decibels (dB).
NOTE 2 In symbols, A-weighted sound exposure level, L , is related to a corresponding measurement of
E
A
time-average, A-weighted sound level, L or L , by
T T
A Aeq
t
2
22
ªº
Lp 10 lg tdtpT 10 lg(E /E ) L 10 lg(T /T ) (4)
AAE 00 A0AT 0
³
^`
«»t
¬¼1
where
– E is the A-weighted sound exposure in pascal-squared seconds (see equation (3));
A
2 -12 2
– E is the reference sound exposure of (20 PPa) u (1 s) = 400 u 10 Pa s;
0
– T = 1 s; and
0
– T = t – t is the time interval for measurement, in seconds, for sound exposure level and time-average sound
2 1
level.
NOTE 3 Time-average, A-weighted sound level L or L during time interval T is related to the total
T T
A Aeq
A-weighted sound exposure E occurring within that interval by
A
0,1L
2
AT
Ep T 10 (5a)
A0
or
2
ªº
LE 10 lg pTL 10 lgTT (5b)
AATE0 A 0
¬¼
3.12
microphone reference point
point specified on, or close to, the microphone to describe the position of the microphone
NOTE The microphone reference point may be at the centre of the diaphragm of the microphone.
3.13
reference direction
inward direction toward the microphone reference point and specified for determining the
acoustical response, directional response, and frequency weighting of a sound level meter
NOTE The reference direction may be specified with respect to an axis of symmetry.
3.14
sound-incidence angle
angle between the reference direction and a line between the acoustic centre of a sound
source and the microphone reference point
NOTE Sound-incidence angle is expressed in degrees.
3.15
level range
range of nominal sound levels measured with a particular setting of the controls of a sound
level meter
NOTE Level range is expressed in decibels (dB).
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61672-1 © IEC:2002 – 19 –
3.16
reference sound pressure level
sound pressure level specified for testing the electroacoustical performance of a sound level
meter
NOTE Reference sound pressure level is expressed in decibels (dB).
3.17
reference level range
level range specified for testing the electroacoustical characteristics of a sound level meter
and containing the reference sound pressure level
NOTE Reference level range is expressed in decibels (dB).
3.18
calibration check frequency
nominal frequency, in the range from 160 Hz to 1 250 Hz, of the sinusoidal sound pressure
produced by a sound calibrator that is used in checking and adjusting a sound level meter
3.19
level linearity error
at a stated frequency, an indicated signal level minus the anticipated signal level
NOTE Level linearity error is expressed in decibels (dB).
3.20
linear operating range
on any level range and at a stated frequency, the range of sound levels over which level
linearity errors are within the tolerance limits specified in this standard
NOTE Linear operating range is expressed in decibels (dB).
3.21
total range
range of A-weighted sound levels, in response to sinusoidal signals, from the smallest sound
level, on the most-sensitive level range, to the highest sound level, on the least-sensitive level
range, that can be measured without indication of overload or under-range and within the
tolerance limits specified in this standard for level linearity error
NOTE Total range is expressed in decibels (dB).
3.22
toneburst
one or more complete cycles of a sinusoidal signal starting and stopping at a zero crossing of
the waveform
3.23
toneburst response
maximum time-weighted sound level, time-average sound level, or sound exposure level,
measured in response to a sinusoidal electrical toneburst minus the corresponding measured
sound level of the steady sinusoidal input signal from which the toneburst was extracted
NOTE Toneburst response is expressed in decibels (dB).
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61672-1 © IEC:2002 – 21 –
3.24
reference orientation
orientation of a sound level meter for tests to demonstrate conformance to the specifications
of this standard for emissions of, and susceptibility to, radio frequency fields
4 Reference environmental conditions
Reference environmental conditions for specifying the performance of a sound level meter
are:
– air temperature 23 °C;
– static pressure 101,325 kPa;
– relative humidity 50 %.
5 Performance specifications
5.1 General
5.1.1 Generally, a sound level meter is a combination of a microphone, a signal processor,
and a display device.
The signal processor includes the combined functions of an amp
...
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