NBN EN 60645-2 : 1997

INTRODUCTION
1 Scope and object
2 Normative references
3 Definitions
4 General requirements
5 Minimum requirements for specific types of
    audiometers
6 Reference conditions for specification, testing and
    calibration of speech audiometers
7 Signal level indicator
8 Output level control for speech signals
9 Output sound-pressure level and vibratory force level
1 Frequency response
11 Harmonic distortion
12 Signal-to-noise ratio
13 Masking sound
14 Monitor earphone or loudspeaker
15 Talkback system
16 Interrupter switches
17 Marking and instruction manual
Annex A - Correction figures for free-field equivalent output
for certain types of commonly used earphones
Annex ZA (normative) Normative references to international
publications with their corresponding European publications

Defines requirements for audiometers or parts thereof for provision of a means of presenting speech sounds to a subject in a standard manner such as for measuring speech recognition. Type A supplies a wide range of facilities and Type B only basic facilities.