IEC 60704-2-1-2020 pdf download.Household and similar electrical appliances – Test code for the determination of airborne acoustical noise – Part 2-1: Particular requirements for dry vacuum cleaners.
4 Measurement methods and acoustical environments
This clause of Part 1 is applicable except as follows:
4.2 Direct 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 special reverberation room may increase. In such cases additional microphone positions or source positions may 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 may increase. In such cases additional microphone positions or source positions may be necessary, as specified in ISO 3743-1 or ISO 3743-2.
5 Instrumentation
This clause of Part 1 is applicable except as follows:
5.1 Instrumentation for measuring acoustical data Addition:
The use of a windscreen is recommended. If necessary, the observed sound pressure level shall be corrected for changes in the microphone sensitivity, in accordance with the instructions accompanying the instrumentation.
6 Operation and location of appliances under test
This clause of Part 1 is applicable except as follows:
6.1 Equipping and pre-conditioning of appliances
6.1.1 Replacement:
The tube grip of cleaners with suction hose or the handle of other cleaners shall be held at a height of (800 ± 50) mm above the test surface. Any telescopic suction tubes or sticks shall be extended to maximum length. For nozzles without pivoting connectors, it shall be ensured that the bottom of the cleaning head be made parallel with the test surface by adjusting the handle height within the tolerances. If this is not possible, the length of a telescopic tube or stick may be adjusted. Any adjustment shall be reported.
For declaration and compliance purposes, related tests conducted on a surface type (carpet or hard surface with or without crevice) shall be conducted with the same dry vacuum cleaner setting configurations such as power, cleaning head and cleaning head setting.
Unless otherwise specified, the dry vacuum cleaner setting configurations, such as cleaning head and cleaning head setting, shall be used and adjusted in accordance with the manufacturer’s instructions for the surface to be cleaned (e.g. carpet or hard floor) for the test to be carried out.
In the absence of unambiguous instructions within the manufacturer’s instructions, the product shall be tested with settings that are in accordance with any explicitly clear text, symbol or pictogram that is identifiable on the product.IEC 60704-2-1 pdf download.