ISO 6798-2-2020 pdf free.Reciprocating internal combustionengines — Measurement of soundpower level using sound pressure.
This document specifies the survey method, which is the measurement method of the sound powerlevel for reciprocating internal combustion engines.
This document applies to all reciprocating internal combustion engines falling within the field ofapplication of ISO 3046-1 and other internal combustion engines where no suitable InternationalStandard exists.
NOTE In this document,reciprocating internal combustion engines are referred to as engines unlessotherwise explained.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references,only the edition cited applies.Forundated references, the latest edition of the referenced document (including any amendments) applies.ISO3046-1, Reciprocating internal combustion engines —Performance —Part 1: Declarations of power, fueland lubricating oil consumptions, and test methods —Additional requirements for engines for general useISO 3046-3, Reciprocating internal combustion engines —Performance — Part 3: Test measurementsISO 6798-1,Reciprocating internal combustion engines — Measurement of sound power level using soundpressure — Part 1: Engineering method.ISO 6926,Acoustics —Requirements for the performance and calibration of reference sound sources usedfor the determination of sound power levels.IEC 60942,Electroacoustics —Sound calibrators.IEC 61672-1, Electroacoustics — Sound level meters — Part 1:Specifications.
The test environment shall be a room or a flat outdoor area which is adequately isolated frombackground noise and which meets the qualification requirements given in 4.3.Environmental conditions having an adverse effect on the microphones used for the measurements (e.g.wind, impingement of air discharge, high or low temperatures) shall be avoided.The instructions of themanufacturer on the measuring instrumentation regarding adverse environmental conditions shall befollowed.Particular care should be exercised to ensure that any plane does not radiate any appreciablesound due to vibrations.The time-averaged sound pressure level (abbreviated as sound pressure level in the following text) ofthe background noise measured and meant (energy average) over the microphone positions shall be atleast 3,0 dB, and preferably more than 10,0 dB, below the corresponding uncorrected sound pressurelevel of the noise source under test when measured in the presence of this background noise.ISO 6798 pdf download.