This standard belongs to the engineering level measurement method and is applicable to the noise measurement of various electric tools (hereinafter referred to as tools) under stable operating conditions. This standard specifies the measurement method of A-weighted sound power level. The method of measuring the sound pressure level on the measuring surface of the enveloping sound source within one or more reflecting planes (indoor or outdoor) to calculate the sound power level of the sound source is provided. The requirements for the testing environment, measuring instruments, and the calculation method for the surface sound pressure level and sound power level are also provided. The accuracy level of the measurement results of sound power level is level 2. This standard does not apply to tools with a single pulse and burst sound with a repetition rate of less than 10 times per second. 2 Normative References: The provisions in the following documents become provisions of this standard through reference in this standard. For dated references, all subsequent amendments (excluding machine errors) or revisions do not apply to this standard. However, parties who are unable to reach agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. The latest version of any referenced document with illegal dates is applicable to this standard. GB/T 3241-1998 Octave and Fractional Octave Band Filters (eqy IEC 1260:1995) GB/T 3785-1983 Electrical and Acoustic Performance and Test Methods for Sound Level Meters GB/T 3947-1996 Acoustics Terminology GB/T41292p03 Acoustics - Performance and Calibration Requirements for Standard South Sources Used for Sound Level Determination (ISO6926; 199IDT) GB/T 6882-1986 Acoustics - Determination of Sound Power Levels of Noise Sources - Precision Waves for Anechoic and Semi-anechoic Rooms GB/T 17181-1997 Integrated Average Sound Level Meters ISO 354:2008, Acoustics - Measurement of sound absorption in a reverberation room - ISO 3744.1994- Acoustic sound pressure method - Engineering method for determining sound power levels of noise sources - ISO 862-7 199- Measurement of deep motion of hand-held electric tool handles - Part 7: Wrenches, screwdrivers, and nut wrenches with impact pulse and ratchet force - ISO 11094:19917 meter electric lawn mowers, lawn tractors, lawn and garden tractors, ISO 862-7 199 Specification for airborne noise emitted by professional lawn mowers and lawn and garden tractors with cutting attachments -3 Terms and definitions. The following terms and definitions are used in this standard:; Other terminology shall comply with the provisions of GB/T 3947. 3.1 Sound pressure level The logarithm of the ratio of sound pressure to reference sound pressure multiplied by 2 at the base of 10, expressed in dB. The reference sound pressure p is 20 μ Pa=2.0X10~* N/m '. 3.2 Sound power level The logarithm of the ratio of sound power to reference sound power, expressed in dB, at the base of 10
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