NS EN ISO 8253-2 : 2009

Committees responsible
National foreword
EN title page
Foreword
Method
Introduction
1 Scope
2 Normative references
3 Definitions
4 Test signal characteristics
5 Sound field characteristics
6 Ambient noise levels in the test room
7 Preparation and instruction of test subject
8 Determination of hearing threshold level
9 Testing with a hearing aid
10 Screening audiometry
11 Reporting of data
12 Maintenance and calibration of equipment
Annexes
A (informative) Graphical display of results
B (informative) Correction values for 45 deg and 90 deg
    angles of incidence
C (informative) Bibliography
Tables
1 Microphone requirements for diffuse sound field measurement
2 Maximum permissible ambient sound pressure levels in
    one-third octave bands, Lmax, for sound field audiometry
    A.1 Symbols for test conditions
    B.1 Increase in sound pressure level at the ear
          closest to the loudspeaker
Figures
    A.1 Hearing threshold levels
    A.2 Threshold sound pressure levels

Defines relevant test signal characteristics, requirements for free, diffuse and quasi-free sound fields and methods for sound field audiometry by means of pure tones, frequency modulated tones or other narrow-band test signals presented by means of one or more loudspeakers, mainly for the determination of hearing threshold levels in the frequency range 125 - 12500 Hz.