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See Chinese contents: GB/T 1859.2-2015 GB/T 1859.2-2015: Reciprocating internal combustion engines -- Measurement of sound power level using sound pressure -- Part 2: Survey method
This Part of GB/T 1859 specifies the measurement method for sound power level of reciprocating internal combustion engines - survey method. This Part is applicable to reciprocating internal combustion engines (unless otherwise specified, hereafter known as engines for short) in the scope of application of GB/T 6072.1, and other internal combustion engines to which no suitable standards apply.
