This standard describes methods to measure the acoustical effects of a simulated median adult wearer on the performance of a hearing aid using: direct simulated real-ear aided measurements (sound pressure developed by a hearing aid in an ear simulator for a given free-field input sound pressure), and insertion measurements (the difference between the sound pressures developed in the ear simulator with and without a hearing aid in place). These test methods are not intended for quality control.
ANSI/ASA S3.35-2010 history
2010ANSI/ASA S3.35-2010 Method of Measurement of Performance Characteristics of Hearing Aids Under Simulated Real-Ear Working Conditions