1、 STD=BSI BS EN b0704-2-7-ENGL 1998 W Lb24669 Ob94418 O41 BRITISH STANDARD 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
2、 ICs 17.140.20, 23.120 3s EN $0704-2-7 : 1998 STD-BSI BS EN b0704-2-7-ENGL 1998 m 1624669 Ob94419 T88 m BS EN 607042-7 : 1998 National foreword This British Standard is the Engish language version of EN 60704-2-7 : 1998. It is identid with IEC 60704-2-7 : 1997. The UK participation in its preparatio
3、n was entrusted to Technical Commiaee CPy59, Performance of household electrical appliances, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible internationavEuropean committee any enquiries on the interpretation, or proposals for change, and keep th
4、e UK interests informed; - monitor related international and European developments and promulgate them in the UK A list OP organizations represented on this committee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number.
5、 For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an a
6、nnex which lists normative references to international publications with their corresponing European publications. The British Standards which implement these intemational or European publicaiions may be found in the BSI Standards Catalogue under the section entitied International Standards Correspo
7、ndence Index, or by using the Find facility of the BSI standards Electronic Catalogue. 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, the EN title page, pages 2 to 12, an ins
8、ide back cover and a back cover. This British Standard, having been prepared under the direction of the Electrokchnicai Sector Board, was published under the authority of the Standards Board and comes into effect on 15 April 1998 O BSI 1998 ISBN O 680 28878 1 Amendments issued since publication Amd.
9、No* ID - 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 be 1,5 m I: 0,05 m. In all cases, care shall be taken to follow the instructions given by the manufacturer and to avoid any structure-b
10、orne 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 fan. 6.5.5 Not applicable. 6.5.7 Not applicable. 7 Measurement of sound pressure le
11、vels II . This clause of Part 1 is applicable except as follows: Addition: The use of a windscreen is mandatory. 7.1 Microphone array, measurement surface and RSS location for essentially free-field conditions over reflecting planefs) 7.1.1 Addition: This measurement surface shall be used for table,
12、 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. STD=BSI BS EN 60704-2-7-ENGL 1998 = Lb24bb9 Obq4428 TqO Page 9 EN 60704-2-7 : 1998 7.1.4 Replacement: For partition (wall and wind
13、ow) fans and wall-mounted table fans, the measurement surface is a hemisphere, with 10 microphone positions as specified in figure 101, centred in the projection of the geometrical centre of the reference box on the vertical plane, the co-ordinate system describing the microphone positions being loc
14、ated 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 Fax: 0181 996 7400. BSI o
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