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Historical
ANSI/ASA S3.46-2013 (R2018)
Methods of Measurement of Real-Ear Performance Characteristics of Hearing Aids
This standard covers the terminology, procedures and essential equipment characteristics for the measurement of the acoustic output and acoustic gain of hearing aids, coupled to human ears, in a variety of acoustic environments and for the measurement of certain acoustic properties of the ear related to the application of hearing aids. These measurements can be divided into two classes: (a) direct measures of sound pressure level (SPL), and (b) insertion measurements. Direct measures (previously called in situ measurements) report SPL developed in an ear canal, with or without a hearing aid in place and are expressed as dB gain relative to the SPL at a field reference point. Insertion measurements report ear canal SPL with a hearing aid in place relative to the ear canal SPL without the hearing aid. Behavioral measures of real-ear hearing aid performance, such as functional gain, are excluded from this standard.
Acoustical Society of America [asa]