1、 IEC 62585 Edition 1.0 2012-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Electroacoustics Methods to determine corrections to obtain the free-field response of a sound level meter lectroacoustique Mthodes de dtermination de corrections pour obtenir la rponse en champ libre dun sonomtre IEC62585:20
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16、NORME INTERNATIONALE Electroacoustics Methods to determine corrections to obtain the free-field response of a sound level meter lectroacoustique Mthodes de dtermination de corrections pour obtenir la rponse en champ libre dun sonomtre INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHN
17、IQUE INTERNATIONALE X ICS 17.140.50 PRICE CODE CODE PRIX ISBN 978-2-83220-290-6 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. At
18、tention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 62585 IEC:2012 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references . 8 3 Terms and definitions . 8 4 Reference environmental conditions . 9 5 Uncertainties of measurement 9 6 Genera
19、l requirements for measurement of adjustment value and corrections 10 7 Submission and inspection . 12 8 Determination of the adjustment value at the calibration check frequency . 12 9 Determination of corrections for the typical effects of reflections from the case of the sound level meter and diff
20、raction of sound around the microphone . 13 10 Determination of corrections for the deviation of the microphone free-field frequency response from a uniform frequency response . 13 11 Determination of corrections for the use of windscreens and similar accessories 14 12 Determination of corrections o
21、ver a range of frequencies when a sound calibrator is recommended for use by the sound level meter manufacturer . 14 13 Determination of corrections over a range of frequencies when a comparison coupler is recommended for use by the sound level meter manufacturer 15 14 Determination of corrections o
22、ver a range of frequencies when an electrostatic actuator is recommended for use by the sound level meter manufacturer . 16 15 Documentation . 16 Annex A (normative) Calibration check frequency Determination of the adjustment value 18 Annex B (normative) Determination of the effects of reflections f
23、rom the case of the sound level meter and diffraction of sound around the microphone . 20 Annex C (normative) Determination of the effects of the use of windscreens and similar accessories . 21 Annex D (informative) Determination of corrections for use with sound calibrators to determine equivalent
24、free-field response at all frequencies of interest 22 Annex E (informative) Determination of corrections for use with comparison couplers to determine equivalent free-field frequency response at all frequencies of interest 25 Annex F (informative) Determination of corrections for use with electrosta
25、tic actuators to determine equivalent free-field frequency response at all frequencies of interest 28 Annex G (informative) Comparison techniques. 31 Annex H (informative) Exact one-twelfth-octave frequencies 34 Annex I (informative) Example calculations of expanded uncertainty of measurement 36 Bib
26、liography 40 Figure 1 Mounting methods for the sound level meter 11 Figure A.1 Diagrammatic representation of factors for consideration in optimising adjustment value at the calibration check frequency . 19 Figure D.1 Measurement steps using a sound calibrator 22 Figure E.1 Measurement steps using a
27、 comparison coupler . 25 62585 IEC:2012 3 Figure F.1 Measurement steps using an electrostatic actuator . 28 Table H.1 Exact frequencies for one-twelfth-octave steps over one decade . 35 Table I.1 Description of likely uncertainty components . 37 Table I.2 Uncertainty example for a frequency of 1 kHz
28、 . 38 Table I.3 Uncertainty example for a frequency of 8 kHz . 39 4 62585 IEC:2012 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTROACOUSTICS METHODS TO DETERMINE CORRECTIONS TO OBTAIN THE FREE-FIELD RESPONSE OF A SOUND LEVEL METER FOREWORD 1) The International Electrotechnical Commission (IEC) is
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39、ubject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62585 has been prepared by IEC technical committee 29: Electroacoustics. The text of this International Standard is based on the following documents: FDIS Report on vo
40、ting 29/770/FDIS 29/782/RVD Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 62585 IEC:2012 5 The committee has decide
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42、 6 62585 IEC:2012 INTRODUCTION The performance specification International Standard for sound level meters, IEC 61672-1, requires that at least one model of sound calibrator, conforming to the requirements of IEC 60942 be specified in the instruction manual for checking and maintaining the correct i
43、ndication on the display of the sound level meter at the calibration check frequency. The sound level meter manufacturer specifies the adjustment value to be applied to obtain the required indication on the display in response to the sound pressure level generated by the sound calibrator, in order t
44、o optimize performance over the complete frequency range. In addition, various corrections need to be available over a range of frequencies in order for a periodic test of a sound level meter to be performed according to IEC 61672-3. For example, corrections are needed for any effects of the sound l
45、evel meter case or of accessories such as windscreens on the equivalent free-field sound level. Information on these corrections is also required by users of sound level meters and sound calibrators on a regular basis. Also, a manufacturer producing a sound level meter to the specifications of IEC 6
46、1672-1, may recommend, in the instruction manual, the use of a sound calibrator, comparison coupler or electrostatic actuator to determine the acoustical response of a sound level meter at various frequencies. In this case the manufacturer is required to provide corrections to obtain equivalent soun
47、d levels that would be displayed under reference environmental conditions in response to plane progressive sinusoidal waves that are incident from the reference direction at each frequency used for periodic testing. These corrections will either be given in the instruction manual, or the instruction
48、 manual will state where they can be found. 62585 IEC:2012 7 ELECTROACOUSTICS METHODS TO DETERMINE CORRECTIONS TO OBTAIN THE FREE-FIELD RESPONSE OF A SOUND LEVEL METER 1 Scope This International Standard provides information on the corrections required over a range of frequencies in order for a peri
49、odic test of a sound level meter to be performed according to IEC 61672-3. These corrections include: corrections for the typical effects of reflections from the case of the sound level meter and diffraction of sound around the microphone; corrections for the deviation of the typical microphone frequency response from a uniform frequency response, where the actual microphone response cannot be measured; corrections
