標準號：IS 6229-1980
發布日期：1980/9/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：1.1 This standard specifies the psychophysical procedures, physical requirements, and means of reporting results for measuring the protective and attenuation characteristics of wearable devices that are used to protect the auditory system against excessive sound.1.2 Real-Ear Protection Method — Procedures described in the real-ear ( primary) method are performed by psychoacoustic tests on human subjects and are designed to measure real-ear protection at hearing threshold for completely developed hearing protectors. This primary method is described in 3.1.3 Physical Attenuation Method — Procedures described in the physical attenuation ( supplemental) method are performed by physical tests on a dummy head and also may be used to measure sound attenuation at relatively high sound pressure levels ( see Note ). The supplemental method applies to earmuff-type devices and provides data for use in earmuff design and production quality control, as well as for various other attenuation performance specification purposes.Note — A real-head physical attenuation method (that is, microphone under an earcup worn by subject ), as has sometimes been applied in research and development work, is not standardized in this document. Data and experience with this method have been examined and found to be insufficient for development of a uniform procedure suitable for standardization at this time.1.4 Applications — This standard applies to communication units, special helmets including safety helmets, pressure suits and other systems with sound-protective features, and hearing-protective devices used in combination with one another, that is, earplugs plus earmuffs. Earplugs may not be evaluated by this method. Neither the primary nor the supplemental method is applicable for testing nonlinear devices, amplitude-sensitive devices, and other hearing-protective devices with features designed to operate exclusively against impulsive noises. These devices are included only to the extent that their performance complies with the requirements of the standard. Standard methods for the real-ear evaluation of these devices are not established, consequently, the effectiveness of their special features cannot be adequately described in a uniform manner.