ANSI/ASA S3.1-1999
Maximum Permissible Ambient Noise Levels for Audiometric Test Rooms

Standard No.

ANSI/ASA S3.1-1999

Release Date

1999

Published By

American National Standards Institute （ANSI)

Latest

ANSI/ASA S3.1-1999

Scope

Specifies maximum permissible ambient noise levels (MPANLs) allowed in an audiometric test room that produce negligible masking (<2 dB) of test signals presented at reference equivalent threshold levels specified in ANSI S3.6-1996. The MPANLs are specified from 125 to 8000 Hz in octave and one-third octave band intervals for two audiometric testing conditions (ears covered and ears not covered) and for three test frequency ranges (125 to 8000 Hz, 250 to 8000 Hz, and 500 to 8000 Hz).

ANSI/ASA S3.1-1999 history

• 1999 ANSI/ASA S3.1-1999 Maximum Permissible Ambient Noise Levels for Audiometric Test Rooms