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IEC 61672-3 Edition 2.0 2013-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Ele

IEC 61672-3 Edition 2.0 2013-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Electroacoustics – Sound level meters – Part 3: Periodic tests Electroacoustique – Sonomètres – Partie 3: Essais périodiques INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE R ICS 17.140.50 PRICE CODE CODE PRIX ISBN 978-2-8322-1078-9 ® Registered trademark of the International Electrotechnical Commission Marque déposée de la Commission Electrotechnique Internationale ® Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé. This is a preview - click here to buy the full publication – 2 – 61672-3  IEC:2013 CONTENTS FOREWORD ........................................................................................................................... 3 1 Scope ............................................................................................................................... 5 2 Normative references ........................................................................................................ 5 3 Submission for testing ...................................................................................................... 6 4 Conformance .................................................................................................................... 6 5 Preliminary inspection ....................................................................................................... 7 6 Power supply .................................................................................................................... 7 7 Environmental conditions .................................................................................................. 8 8 General test requirements ................................................................................................. 8 9 Sound calibrator ............................................................................................................... 8 9.1 General ................................................................................................................... 8 9.2 Information for operation .......................................................................................... 9 9.3 Information for testing .............................................................................................. 9 9.4 Calibration of the sound calibrator ............................................................................ 9 10 Indication at the calibration check frequency ..................................................................... 9 11 Self-generated noise ......................................................................................................... 9 11.1 Microphone installed ................................................................................................ 9 11.2 Microphone replaced by the electrical input-signal device ....................................... 10 12 Acoustical signal tests of a frequency weighting .............................................................. 10 13 Electrical signal tests of frequency weightings ................................................................. 12 14 Frequency and time weightings at 1 kHz ......................................................................... 13 15 Long-term stability .......................................................................................................... 14 16 Level linearity on the reference level range...................................................................... 14 17 Level linearity including the level range control ................................................................ 14 18 Toneburst response ........................................................................................................ 15 19 C-weighted peak sound level .......................................................................................... 16 20 Overload indication ......................................................................................................... 16 21 High-level stability ........................................................................................................... 17 22 Documentation ............................................................................................................... 17 This is a preview - click here to buy the full publication 61672-3  IEC:2013 – 3 – INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________ ELECTROACOUSTICS – SOUND LEVEL METERS – Part 3: Periodic tests FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). 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. 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 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 IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61672-3 has been prepared by IEC technical committee 29: Electroacoustics, in cooperation with the International Organization of Legal Metrology (OIML). This second edition cancels and replaces the first edition published in 2006. This second edition constitutes a technical revision. The main technical changes with regard to the previous edition are as follows: In this second edition, conformance to specifications is demonstrated when: a) measured deviations from design goals do not exceed the applicable acceptance limits, and b) the uncertainty of measurement does not exceed the corresponding maximum-permitted uncertainty, with both uncertainties determined for a coverage probability of 95 %. This is a preview - click here to buy the full publication – 4 – 61672-3  IEC:2013 The text of this second edition is based on that of the first edition and the following documents: FDIS Report on voting 29/814/FDIS 29/825/RVD Full information on the voting for the approval of this 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. A list of all parts in the IEC 61672 series, published under the general title Electroacoustics – Sound level meters, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be • reconfirmed, • withdrawn, • replaced by a revised edition, or • amended. A list of all parts of the IEC 61672 series, published under the general title Electroacoustics – Sound level meters, can be found on the IEC website. This is a preview - click here to buy the full publication 61672-3  IEC:2013 – 5 – ELECTROACOUSTICS – SOUND LEVEL METERS – Part 3: Periodic tests 1 Scope This second edition of IEC 61672-3 describes procedures for periodic testing of time-weighting, integrating-averaging, and integrating sound level meters that were designed to conform to the class 1 or class 2 specifications of the second edition of IEC 61672-1. The aim of the standard is to ensure that periodic testing is performed in a consistent manner by all laboratories. NOTE 1 In this document, references to IEC 61672-1, IEC 61672-2, and IEC 61672-3 refer to the second editions unless stated otherwise. NOTE 2 Procedures for the periodic testing of sound level meters designed to conform to the specifications of IEC 61672-1:2002 were given in IEC 61672-3:2006. The purpose of periodic testing is to assure the user that the performance of a sound level meter conforms to the applicable specifications of IEC 61672-1 for a limited set of key tests and for the environmental conditions under which the tests were performed. The extent of the tests in this part of IEC 61672 is deliberately restricted to the minimum considered necessary for periodic tests. Periodic tests described in this edition of IEC 61672-3 apply to sound level meters for which the manufacturer claims conformance to the specifications of the second edition of IEC 61672-1. Periodic tests described in this part of IEC 61672 apply to sound level meters for which the model has been, or has not been, pattern approved by an independent testing organization responsible for pattern approvals in accordance with the test procedures of the second edition of IEC 61672-2. Because of the limited extent of the periodic tests, if evidence of pattern approval is not publicly available, no general conclusion about conformance to the specifications of IEC 61672-1 can be made, even if the results of the periodic tests conform to all applicable requirements of this edition of IEC 61672-3. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60942, Electroacoustics – Sound calibrators IEC 61094-5, Measurement microphones – Part 5: Methods for pressure calibration of working standard microphones by comparison IEC 61094-6, Measurement microphones – Part 6: Electrostatic actuators for determination of frequency response IEC 61183, Electroacoustics – Random-incidence and diffuse-field calibration of sound level meters This is a preview - click here to buy the full publication – uploads/s1/international-standard-norme-internationale 11 .pdf