BS EN 60704-2-7-1998 Test code for the determination of airborne acoustical noise emitted by household and similar electrical appliances - Particular requirements - Particular requ.pdf

1、BRITISH STANDARD BS EN 60704-2-7:1998 Household and similar electrical appliances Test code for the determination of airborne acoustical noise Part 2: Particular requirements for fans The European Standard EN 60704-2-7:1998 has the status of a British Standard ICS 17.140.20; 23.120BSEN 60704-2-7:199

2、8 This British Standard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15 April 1998 BSI 03-1999 ISBN 0 580 28878 1 National foreword This British Standard is the English language version

3、of EN60704-2-7:1998. It is identical with IEC60704-2-7:1997. The UK participation in its preparation was entrusted to Technical Committee CPL/59, Performance of household electrical appliances, which has the responsibility to: aid enquirers to understand the text; present to the responsible internat

4、ional/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its se

5、cretary. From 1 January 1997, all IEC publications have the number60000added to the old number. For instance, IEC27-1 has been renumbered as IEC60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-r

6、eferences Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be f

7、ound in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standa

8、rds are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 8 and a back cover. This standa

9、rd has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN 60704-2-7:1998 BSI 03-1999 i Contents Page National foreword Inside front cover F

10、oreword 2 Text of EN 60704-2-7 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60704-2-7 February 1998 ICS 17.140.20; 23.120 English version Household and similar electrical appliances Testcodeforthe determination of airborne acoustical noise Part 2: Particular requirements for fans (I

11、EC 60704-2-7:1997) Appareils lectrodomestiques et analogues Code dessai pour la dtermination du bruit arien Partie 2: Rgles particulires pour les ventilateurs (CEI 60704-2-7:1997) Elektrische Gerte fr den Hausgebrauch und hnliche Zwecke Prfvorschrift fr die Bestimmung der Luftschallemission Teil 2:

12、Besondere Bestimmungen fr Lfter (IEC 60704-2-7:1997) This European Standard was approved by CENELEC on 1998-01-01. 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

13、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 m

14、ade 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, Germ

15、any, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Sec

16、retariat: rue de Stassart 35, B-1050 Brussels 1998 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60704-2-7:1998 EEN 60704-2-7:1998 BSI 03-1999 2 Foreword The text of document 59/179/FDIS, future edition 1 of IEC60704-2-7, prepared

17、 by IECTC59, Performance of household electrical appliances, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN60704-2-7 on1998-01-01. The following dates were fixed: This part2 of EN60704 is to be used in conjunction with EN60704-1:1997, Household and similar electrica

18、l appliances Test code for the determination of airborne acoustical noise Part 1: General requirements. This part2 supplements or modifies the corresponding clauses in EN60704-1. Where a particular clause or subclause of part1 is not mentioned in this part2, that clause or subclause applies as far a

19、s is reasonable. Where this part2 states “addition”, “modification” or “replacement”, the relevant text of part1 is to be adapted accordingly. Subclauses and figures which are additional to those in part1 are numbered starting from from101. Annexes designated “normative” are part of the body of the

20、standard. Annexes designated “informative” are given for information only. In this standard, Annex B and Annex ZA are normative and Annex A is informative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC60704-2-7:1997 was approved by CENELEC as a Eur

21、opean Standard without any modification. Contents Page Introduction 3 1 Scope and object 3 2 Normative references 3 3 Terms and definitions 3 4 Measurement methods and acoustical environments 4 5 Instrumentation 4 6 Operation and location of appliances under test 4 7 Measurement of sound pressure le

22、vels 4 8 Calculation of sound pressure and sound power levels 5 9 Information to be recorded 5 10 Information to be reported 5 Annex A (informative) Guidelines for the design of simple test rooms with essentially free-field conditions 7 Annex B (normative) Standard test table 7 Annex ZA (normative)

23、Normative references to international publications with their corresponding European publications 8 Figure 101 Measurement surface hemisphere with 10 microphone positions for partition (wall and window) fans and for wall-mounted table fans 6 latest date by which the EN has to be implemented at natio

24、nal level by publication of an identical national standard or by endorsement (dop) 1998-10-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1998-10-01EN 60704-2-7:1998 BSI 03-1999 3 Introduction The measuring conditions specified in this Part2 provide

25、 for sufficient accuracy in determining the noise emitted, and the comparison of the results of measurements taken by different laboratories, whilst simulating as far as possible the practical use of household fans. It is recommended to consider the determination of noise levels as part of a compreh

26、ensive testing procedure covering many aspects of the properties and performance of household fans. NOTEAs stated in the introduction to IEC60704-1, this test code is concerned with airborne noise only. 1 Scope and object This clause of Part1 is applicable except as follows: 1.1 Scope Replacement: T

27、his standard applies to electrical fans (including their accessories and their component parts) for household and similar use, designed for a.c. or d.c. supply. Motor, impeller and their housing, if any, form a single unit. These particular requirements apply to table fans, pedestal fans, ceiling fa

28、ns, partition fans. This standard does not apply to fans which are part of a ventilation system, fans designed exclusively for industrial purposes, fans which are part of an appliance (for example cooling fans), fans with additional functions (for example heating, humidifying). Limitations for the u

29、se of this test code are given in the scope of IEC60704-1. 1.2 Object Addition: This standard describes the determination of the noise emission of household fans in normal operation at maximum speed. Other speeds can be used in addition. Requirements for the declaration of noise emission values are

30、not within the scope of this standard. The aim of this standard is to measure the noise in a room resulting from the operation of the fan. NOTEFor determining and verifying noise emission values declared in product specifications, seeIEC60704-3. 2 Normative references This clause of Part1 is applica

31、ble except as follows: Addition: IEC60665:1980, A.C. electric ventilating fans and regulators for household and similar purposes. IEC60704-1:1997, Household and similar electrical appliances Test code for the determination of airborne acoustical noise Part1: General requirements 1) . IEC60879:1986,

32、Performance and construction of electric circulating fans and regulators. 3 Terms and definitions This clause of Part1 is applicable except as follows: Addition: 3.101 table fan a smaller diameter propeller-bladed fan having two or more blades, intended for use with free inlet and outlet of air. It

33、may be a table fan or bracket-mounted fan for wall or ceiling mounting IEC 60879 NOTEAdjustment of height, position and oscillation may be possible. 3.102 pedestal fan a propeller type fan having two or more blades mounted on a pedestal of fixed or variable height and intended for use with free inle

34、t and outlet of air IEC 60879 NOTEAdjustment of position and oscillation may be possible. 3.103 ceiling fan a propeller-bladed fan having two or more blades, and provided with a device for suspension from the ceiling of a room so that the blades rotate in a horizontal plane IEC 60879 3.104 partition

35、 (wall and window) fans fans designed for installation in wall or window openings. The air is displaced from one room to another or to atmosphere, or vice versa (seealsoIEC60665) 1) To be published.EN 60704-2-7:1998 4 BSI 03-1999 4 Measurement methods and acoustical environments This clause of Part1

36、 is applicable except as follows: 4.2 Direct method Addition: NOTEIf pure tone components are present in the noise emitted, proper precautions should be taken as specified in ISO3743-1, ISO3743-2 and ISO3744. 4.3 Comparison method Modification: The comparison method described in ISO3743-1 is not app

37、licable. NOTE 1Measurement according to ISO3743-1 is under consideration. NOTE 2If pure components are present in the noise emitted, proper precautions should be taken as specified in ISO3743-1, ISO3743-2 and ISO3744. 5 Instrumentation This clause of Part1 is applicable except as follows: Addition:

38、The use of a windscreen is mandatory, and necessary corrections for changes in the microphone sensitivity shall be added to the observed sound pressure levels. 6 Operation and location of appliances under test This clause of Part1 is applicable except as follows: 6.2 Supply of electricity and of wat

39、er or gas 6.2.3 and 6.2.4 Not applicable. 6.4 Loading and operating of appliances during tests 6.4.1 Replacement: Load and operation should simulate normal use. Fans which can be tilted during normal use shall be located in the position with the highest noise level emitted, and the duration of the m

40、easurement shall be at least10s. Fans which can oscillate automatically will operate when oscillating. In the case of oscillating appliances, the A-weighted sound pressure level shall be averaged on at least one complete cycle. 6.4.3 Not applicable. 6.5 Location and mounting of appliances 6.5.1 Addi

41、tion: Ceiling fans may be hung from a special support instead of the ceiling. In this case, care shall be taken to ensure that the means of suspension or clamping do not change the sound output of the appliance. In order not to restrict the airflow, the distance between the lowest edge of the applia

42、nce and the reflecting plane (usually the floor), shall be at least1,5m. Alternatively, ceiling fans can be mounted in the reverse working position on the reflecting plane, providing this does not affect sound radiation. 6.5.2 and 6.5.3 Not applicable. 6.5.4 Replacement: Partition (wall and window)

43、fans shall be mounted in an opening made: either in a wall of the special reverberation test room; or on the second reflecting plane of the free field over a reflecting plane environment. The height between the centre of the appliance and the floor shall be1,5m0,05m. In all cases, care shall be take

44、n to follow the instructions given by the manufacturer and to avoid any structure-borne noise. Care shall be taken to avoid any restriction of the airflow. Attention shall be paid to avoid any difference of pressure between the rooms concerned (or atmosphere), in order to avoid unwanted load on the

45、fan. 6.5.5 Not applicable. 6.5.7 Not applicable. 7 Measurement of sound pressure levels This clause of Part1 is applicable except as follows: Addition: The use of a windscreen is mandatory.EN 60704-2-7:1998 BSI 03-1999 5 7.1 Microphone array, measurement surface and RSS location for essentially free

46、-field conditions over reflecting plane(s) 7.1.1 Addition: This measurement surface shall be used for table, pedestal and ceiling fans. Table fans are placed on the floor. This measurement surface shall not be used for wall fans and window fans. 7.1.2 and 7.1.3 Not applicable. 7.1.4 Replacement: For

47、 partition (wall and window) fans and wall-mounted table fans, the measurement surface is a hemisphere, with 10microphone positions as specified inFigure 101, centred in the projection of the geometrical centre of the reference box on the vertical plane, the co-ordinate system describing the microph

48、one positions being located with the x and y axis in the vertical reflecting plan and the z axis horizontal perpendicular to it. The x axis lies in the horizontal central plane of the reference box. The front of the fan is directed towards the z axis. The area of this measurement surface is S = 2;R

49、2 . The radius of the hemisphere is1m. 7.1.5 Not applicable. 7.1.6 Addition: This measurement surface shall be used for tall pedestal fans. 7.2 Not applicable. 7.4 Measurements 7.4.4 Not applicable. 8 Calculation of sound pressure and sound power levels This clause of Part1 is applicable. 9 Information to be recorded This clause of Part1 is applicable except as follows: 9.7 Electric supply, water supply etc. 9.7.3 and 9.7.4 Not applicable. 10 Information to be reported This clause of Part1 is applicable,