IS 19383 : 2025 Audiometric Test Room - Specification
1 SCOPE
This document establishes limits for permissible ambient noise in audiometric test rooms and specifies the methods of measurement to be used. Within this standard, maximum permissible ambient sound pressure levels and their measurement, are specified for performing hearing threshold measurements via:
a) pure-tone air conduction audiometry by means of various earphones;
b) pure-tone bone conduction audiometry by means of bone vibrator; and
c) sound field audiometry by means of one or more loudspeakers; primarily over the test frequency range of 125 Hz to 8 000 Hz.
The document also specifies ambient noise requirements for performing speech audiometry. The purpose of this document is to ensure that tests of hearing in audiometric test rooms are as accurate and reproducible as possible and are not influenced by the masking effects of ambient noise.
2 REFERENCES
The standards given below contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of these standards:
| IS No./Other Standards | Title |
| IS 6964 : 2018/IEC 61260-1 : 2014 | Electroacoustics - Octave-band and fractional octave band filters: Part 1 Specifications |
| IS 15575 (Part 1) : 2016/IEC 61672-1 : 2013 | Electroacoustics-Sound level meters: Part 1 Specifications |
| ISO 389-3 : 2016 | Acoustics - Reference zero for the calibration of audiometric equipment - Part 3: Reference equivalent threshold vibratory force levels for pure tones and bone vibrators |
| ISO 8253-1 : 2010 | Acoustics - Audiometric test methods - Part 1: Pure-tone air and bone conduction audiometry |
| ISO 8253-2 : 2009 | Acoustics - Audiometric test methods - Part 2: Sound field audiometry with pure-tone and narrow-band test signals |
| ISO 8253-3 : 2022 | Acoustics - Audiometric test methods - Part 3: Speech audiometry |