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, as specified in ISO 3743-1 or ISO 3743-2.
5 Instrumentation
This clause of IEC 60704-1 :201 0 is applicable.
6 Operation and location of appliances under test
This clause of IEC 60704-1 :201 0 is applicable except as follows:
6.1 Equipping and pre-conditioning of appliances
6.1.1
Replacement:
Shavers, hair clippers or trimmers shall be equipped as for ordinary shaving, clipping or trimming. Shavers, hair clippers or trimmers with a cutting selector shall be adjusted in such a way that the cutting head is in the least visible position that the construction allows. The shaver, hair clipper or trimmer shall be clean, including the hair chamber, if any. The appliance shall be oiled with a light oil having a viscosity not exceeding 20 cSt at 50 °C. If the manufacturer prescribes a different method of cleaning or lubrication, the manufacturer’s method should be followed. NOTE 1 01 During handling, take care to avoid any damage, especially to the cutting parts of the appliance as these parts tend to be very delicate.IEC 60704-2-8 pdf download.