ASA - ANSI/ASA S12.42
American National Standard 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
|Publication Date:||11 January 2010|
This standard provides methods for the measurement of the insertion loss of hearing protection devices in specified continuous and impulsive noise environments. The microphone-in-real-e
This standard establishes uniform instrumentation requirements and procedures for the measurement of insertion loss at supra-threshold levels of continuous noise using the MIRE method with human subjects, and at supra-threshold levels with continuous or impulsive noise using the ATF method. These procedures utilize signals at sound levels representative of applications in which hearing protection devices are worn. The methods are intended to provide quick, economical, and repeatable objective (not psychophysical) measurement techniques that can be used as additions or complements to the real-ear attenuation at threshold (REAT) measurement method specified in ANSI/ASA S12.6.
This standard is intended for use in design, quality assurance, and verification of compliance with specifications for hearing protection devices. The MIRE subject selection and fitting procedures described herein correspond to Method A (trained-subject fit) of ANSI/ASA S12.6. An inexperienced subject fit MIRE method, corresponding to Method B of ANSI/ASA S12.6, is not provided because of the degree of subject/experimenter