EN 61988-2-5-2012 en Plasma display panels - Part 2-5 Measuring methods - Acoustic noise.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationPlasma display panelsPart 2-5: Measuring methods Acoustic noise (IEC 61988-2-5:2012)BS EN 61988-2-5:2012National forewordThis British Standard is the UK implementation of EN 6198

2、8-2-5:2012. It is identical to IEC 61988-2-5:2012.The UK participation in its preparation was entrusted to Technical Committee EPL/47, Semiconductors.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the

3、 necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012 ISBN 978 0 580 73058 0 ICS 31.260 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standa

4、rd was published under the authority of the Standards Policy and Strategy Committee on 30 September 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 61988-2-5:2012EUROPEAN STANDARD EN 61988-2-5 NORME EUROPENNE EUROPISCHE NORM August 2012 CENELEC European Commi

5、ttee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC memb

6、ers. Ref. No. EN 61988-2-5:2012 E ICS 31.260 English version Plasma display panels - Part 2-5: Measuring methods - Acoustic noise (IEC 61988-2-5:2012) Panneaux daffichage plasma - Partie 2-5 : Mthodes de mesure - Bruit acoustique (CEI 61988-2-5:2012) Plasmabildschirme - Teil 2-5: Messverfahren - Str

7、gerusche (IEC 61988-2-5:2012) This European Standard was approved by CENELEC on 2012-06-19. 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-d

8、ate lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by transl

9、ation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, De

10、nmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 61

11、988-2-5:2012EN 61988-2-5:2012 Foreword The text of document 110/355/FDIS, future edition 1 of IEC 61988-2-5, prepared by IEC/TC 110 “Electronic display devices“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61988-2-5:2012. The following dates are fixed: latest date by

12、which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2013-03-19 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-06-19 Attention is drawn to the possibility that so

13、me of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 61988-2-5:2012 was approved by CENELEC as a European Standard without

14、 any modification. In the official version, for Bibliography, the following note has to be added for the standard indicated: IEC 61988-3-1 NOTE Harmonised as EN 61988-3-1. BS EN 61988-2-5:2012EN 61988-2-5:2012 Annex ZA (normative) Normative references to international publications with their corresp

15、onding European publications 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

16、 amendments) applies. 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 IEC 60050 Series International Electrotechnical Vocabulary (IEV) - - IEC 60068-1 - Environmental testing - Part 1:

17、 General and guidance EN 60068-1 - IEC 61672-1 - Electroacoustics - Sound level meters - Part 1: Specifications EN 61672-1 - IEC 61988-1 - Plasma display panels - Part 1: Terminology and letter symbols EN 61988-1 - IEC 61988-2-1 - Plasma display panels - Part 2-1: Measuring methods - Optical and opt

18、oelectrical EN 61988-2-1 - IEC 61988-4 - Plasma display Panels - Part 4: Climatic and mechanical testing methods EN 61988-4 - ISO 7574-1 - Acoustics - Statistical methods for determining and verifying stated noise emission values of machinery and equipment - Part 1: General considerations and defini

19、tions EN 27574-1 - BS EN 61988-2-5:201261988-2-5 IEC:2012 CONTENTS 1 Scope . . 5 2 Normative references . 5 3 Terms and definitions . 5 4 Structure of measuring equipment 6 5 Standard measuring conditions . 6 6 Measuring method . 6 6.1 Purpose 6 6.2 Measuring equipment . 6 6.2.1 Equipment list . 6 6

20、.2.2 Anechoic chamber . 6 6.2.3 Silent room 6 6.2.4 Sound level meter. . 7 6.3 Measuring conditions . 7 6.3.1 Layout . 7 6.3.2 Standard measuring distance . . 7 6.3.3 Measuring point 7 6.3.4 Input video signal . . 7 6.3.5 Warm-up conditions . 7 6.3.6 Measuring frequency range . 8 6.3.7 Measuring ban

21、dwidth . 9 6.3.8 Weighting filter . 9 6.4 Calculation of overall acoustic noise level . . 9 6.5 Measurement procedure . 9 6.6 Measurement report . 10 Bibliography . 11 Figure 1 Setting of measuring equipment 8 Figure 2 Measuring point . 8 Table 1 Example of acoustic noise measurement result . 10 BS

22、EN 61988-2-5:201261988-2-5 IEC:2012 5 PLASMA DISPLAY PANELS Part 2-5: Measuring methods Acoustic noise 1 Scope This part of IEC 61988 determines the following measuring methods for characterizing the performance of PDP modules (plasma display modules): Acoustic noise 2 Normative references The follo

23、wing 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 60050 (all p

24、arts), International Electrotechnical Vocabulary (available at ) IEC 60068-1, Environmental testing Part 1: General and guidance IEC 61672-1, Electroacoustics Sound level meters Part 1: Specifications IEC 61988-1, Plasma display panels Part 1: Terminology and letter symbols IEC 61988-2-1, Plasma dis

25、play panels Part 2-1: Measuring methods Optical and optoelectrical IEC 61988-4, Plasma display panels Part 4: Climatic and mechanical testing methods ISO 7574-1, Acoustics Statistical methods for determining and verifying stated noise emission values of machinery and equipment Part 1: General consid

26、erations and definitions 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050-801:1994, IEC 60068-1 and IEC 61988-1 and the following apply. 3.1 acoustic noise audible noise generated by the driving of PDP module, and caused by the vibrations of pan

27、el, electric components, wirings and circuits Note 1 to entry: The noise depends on the image displayed, module (panel) temperature, environmental pressure and surrounding mechanical (acoustic) conditions. 3.2 acoustic noise level L sum of acoustic noise levels that are measured at the individual oc

28、tave band in the measuring frequency range BS EN 61988-2-5:2012 6 61988-2-5 IEC:2012 3.3 acoustic noise level at f Hz Lfnoise amplitude that is measured at the centre frequency of individual 1/3 octave bands in the centre frequency range of 250 Hz 20 000 Hz Note 1 to entry: The centre frequencies of

29、 the individual 1/3 octave bands are 250 Hz, 315 Hz, 400 Hz, 500 Hz, 20 000 Hz. 4 Structure of measuring equipment The system diagrams and/or driving conditions of the measuring equipment shall comply with the structure specified in each item. 5 Standard measuring conditions Measurements shall be ca

30、rried out under the standard environmental conditions defined in IEC 61988-2-1, i.e. at a temperature of 25 C 3 C, a relative humidity of 25 % to 85 %, and a pressure of 98 kPa to 104 kPa, if not otherwise specified in the relevant specifications. When different conditions are used, they shall be no

31、ted in the report. The standard reference atmosphere defined in IEC 61988-4, i.e. 25 C and 101,3 kPa, is applied. 6 Measuring method 6.1 Purpose The purpose of this method is to measure the acoustic noise of a PDP module. 6.2 Measuring equipment 6.2.1 Equipment list The following equipment shall be

32、used: a) anechoic chamber or silent room; b) sound level meter; and c) pattern generator. NOTE Microphone and FFT (Fast Fourier Transformation) analyser with control PC can be used when calibrated against a calibrated sound level meter. 6.2.2 Anechoic chamber An anechoic chamber with an enough size

33、for the measurement should be used. The details of the anechoic chamber shall be noted on the report. The conditions of the anechoic chamber defined in ISO 7574-1 shall be applied, if not otherwise defined in this measurement method. The background noise level of the anechoic chamber shall be measur

34、ed and noted in the report. 6.2.3 Silent room When any proper anechoic chamber is not available, a silent room where the background sound level is small enough for the measurement can be used. In the case of using a silent room, the size of the room should be large enough and the sound reflection fr

35、om the wall, ceiling and floor shall not affect the measurement result. The background noise level of the silent room shall be measured and noted in the report. BS EN 61988-2-5:201261988-2-5 IEC:2012 7 6.2.4 Sound level meter A well calibrated sound level meter shall be used. The details are defined

36、 in IEC 61672-1. NOTE Microphone and FFT analyser with control PC can be used when calibrated against a calibrated sound level meter. 6.3 Measuring conditions 6.3.1 Layout The PDP module shall be set in the anechoic chamber or the silent room as shown in Figure 1. The driving power source, control P

37、C and pattern generator should be set outside the room. The power and signal lines shall be arranged in order to be free from any unwanted vibrations. The microphone shall be aligned perpendicular to the screen centre. The details of the measuring layout applied shall be noted in the report. 6.3.2 S

38、tandard measuring distance The standard measuring distance is 1 m. When other measuring distance is applied, this shall be noted on the report. 6.3.3 Measuring point The measurement shall be carried out at the centre of the screen area as shown in Figure 2. The acoustic noise levels of front and rea

39、r sides of PDP module shall be measured. When different points are measured, this shall be noted in the report. 6.3.4 Input video signal Full screen white at the level of 100 %, full screen black and other signals defined in the relevant specification shall be applied. The applied signals shall be n

40、oted in the report. 6.3.5 Warm-up conditions The PDP module shall be warmed up for 30 minutes or longer under the condition of full screen white to stabilize the panel at around the highest operating temperature in the standard environmental conditions. When another warm-up condition is applied, it

41、shall be noted in the report. NOTE Gas pressure in a PDP panel becomes higher with the increase of panel temperature. The acoustic noise of the panel usually changes with gas pressure. BS EN 61988-2-5:2012 8 61988-2-5 IEC:2012 Microphone/sound level meter PDP module Anechoic chamber or silent room M

42、easuring distance Control PC Pattern generator Driving power source IEC 905/12 Front and rear sides of PDP module are measured. The microphone is aligned perpendicular to screen. The power and signal lines are set free from any unexpected vibrations. Figure 1 Setting of measuring equipment H/2 V V/2

43、 Measuring point H IEC 906/12 Figure 2 Measuring point 6.3.6 Measuring frequency range The standard measuring frequency range is 250 Hz 20 000 Hz. When another measuring frequency is applied, it shall be noted on the report. NOTE The lowest bound of measuring frequency range depends on the cut-off f

44、requency of anechoic chamber. The cut-off frequency of anechoic chamber is defined as follows: Cut-off frequency = vs4wBS EN 61988-2-5:201261988-2-5 IEC:2012 9 where, vsis the velocity of sound and wis the length of wedge foam (shape of sound absorber) in anechoic chamber. If wis 340 mm, the cut-off

45、 frequency is about 250 Hz and the results for frequencies less than 250 Hz are meaningless. 6.3.7 Measuring bandwidth The standard measuring bandwidth is 1/3 octave band. 6.3.8 Weighting filter The acoustic weighting of FFT analyser should be A-weighted (dBA). A-weighting filter is used to emphasiz

46、e frequencies around 3 kHz 6 kHz where the human ear is most sensitive, while attenuating very high and very low frequencies to which the ear is insensitive. NOTE The unit, A-weighted decibel, is abbreviated dBA or dB(A). The decibel (dB) can be used for convenience. 6.4 Calculation of overall acous

47、tic noise level When an FFT analyser is used, overall acoustic noise level L is calculated as follows; fLfL1010log10 = (dB)10where Lfis the acoustic noise level at the frequency f and f is the centre frequency of each 1/3 octave band. 6.5 Measurement procedure The following procedure shall be carrie

48、d out: a) Set the sound level meter toward front side of PDP module; b) Measure the background noise level; c) Turn on the PDP module; d) Warm-up the PDP module with an input signal of full screen white; e) Measure the sound pressure level with the signal of full screen white; f) Turn the signal to

49、full screen black; g) Measure the sound level with the signal of full screen black; h) Calculate and record the measurement result as shown in Table 1, and i) Repeat the measurement from e) for rear side of PDP module. If a procedure different from above is used, it shall be described in detail in the measurement report. BS EN 61988-2-5:2012 10 61988-2-5 IEC:2012 6.6 Measurement report The measurement report shall include the detailed measurement conditi