GB/T 7584.1-2004 (English Version) PDF

Standard No.: GB/T 7584.1-2004
Language: Chinese, Available in English version
Release Date: 2004
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 7584.1-2004
Replace: GB/T 5893.3-1986 GB/T 7584-1987

Scope: This part of GB/T 7584 specifies the subjective measurement method for determining the sound attenuation value of hearing protectors at the listening valve. This method and procedure are designed to determine the maximum sound attenuation value close to the hearing protector, which cannot be obtained under normal sound field test conditions. Because the attenuation values obtained using this method are always reproducible, it has been widely used. These values reflect only the sound attenuation performance of the hearing protector when the user wears the hearing protector in the same manner as the "subject". This measurement method is the data obtained at a low sound pressure level (close to the listening valve), and can also reflect the attenuation value of the hearing protector at a higher sound pressure level. However, for hearing protectors whose sound attenuation is closely related to the sound pressure amplitude, when the sound pressure level exceeds the effective point of its related characteristics, this measurement method is not applicable. Because at this sound pressure level, the method specified in this standard will often underestimate the sound attenuation value of the hearing protector.

GB/T 7584.1-2004 history

2004 GB/T 7584.1-2004 Acoustics-Hearing Protectors Part 1:Subjective method for the measurement of sound attenuation
1987 GB/T 7584-1987 Acoustics--Measurement of sound attenuation of hearing protectors--Subjective method
0000 GB/T 5893.3-1986