IEC 60704-2-8-2020 Household and similar electrical appliances – Test code for the determination of airborne acoustical noise – Part 2-8: Particular requirements for electric shavers, hair clippers or trimmers. 2 Normative references This clause of IEC 60704-1 :201 0 is applicable except as follows: Replacement: ISO 3743-1 :201 0, Acoustics – Determination of sound power levels and sound energy levels of noise sources using sound pressure – Engineering methods for small movable sources in reverberant fields – Part 1: Comparison method for a hard-walled test room ISO 3743-2:201 8, Acoustics – Determination of sound power levels of noise sources using sound pressure – Engineering methods for small, movable sources in reverberant fields – Part 2: methods for special reverberation test rooms ISO 3744:201 0, Acoustics – Determination of sound power levels and sound energy levels of noise sources using sound pressure – Engineering methods for an essentially free field over a reflecting plane 3 Terms and definitions This clause of IEC 60704-1 :201 0 is applicable except as follows: Addition: ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 01 mains powered shaver, hair clipper or trimmer that can be operated directly from the mains supply 3.1 02 rechargeable shaver, hair clipper or trimmer that is supplied by a secondary battery belonging to it 3.1 03 battery powered shaver, hair clipper or trimmer that is supplied by primary batteries 3.1 04 trimmer accessory accessory incorporated in the shaver to groom particular facial hair, for example, moustache, beard or side whiskers 4 Measurement methods and acoustical environments This clause of IEC 60704-1 :201 0 is applicable except as follows: 4.2 Direct method Addition: Shavers, hair clippers or trimmers can produce pure tones. If pure tone components are present in the noise emitted by the source, the estimated standard deviation of the measured sound pressure levels in the special reverberation room can increase. In such cases, additional microphone positions or source positions can be necessary, as specified in ISO 3743-2. 4.3 Comparison method Addition: If pure tone components are present in the noise emitted by the source, the estimated standard deviation of the measured sound pressure levels in the hard-walled test room or in the special reverberation room can increase. In such cases, additional microphone positions or source positions can be necessary,...
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