IEC 60704-2-1-2020 HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – TEST CODE FOR THE DETERMINATION OF AIRBORNE ACOUSTICAL NOISE – Part 2-1: Particular requirements for dry vacuum cleaners

IEC 60704-2-1-2020 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.IEC 60704-2-1 pdf download.