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ANSI/ASA S12.42-2010


Methods for the Measurement of Insertion Loss of Hearing Protection Devices in Continuous or Impulsive Noise Using Microphone-in-Real-Ear or Acoustic Test Fixture Procedures

This standard provides methods for the measurement of the insertion loss of hearing protectiondevices in specified continuous and impulsive noise environments. The microphone-in-real-ear(MIRE) method utilizes human test subjects and may be used for hearing protectors that enclose theears and make supra-aural or circumaural contact with the head, whereas the acoustical test fixture(ATF) method employs an inanimate fixture and can be used for any hearing protection device. Thestandard contains information on instrumentation, calibration, and electroacoustic requirementsincluding details regarding the sound field of test facilities, the acoustical characteristics of ATFs, andsubject selection and training and location of ear-mounted microphones for MIRE testing. Methods formeasuring or determining sound pressure levels in the ear are also specified as well as methods forreporting the calculated insertion loss.

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