BS 5966:1980

National foreword
Cooperating organizations
1 Scope
2 Object
3 Explanation of terms
3.1 Pure tone audiometer
3.2 Speech audiometer
3.3 Air conduction
3.4 Bone conduction
3.5 Equivalent threshold level (monoaural listening)
3.6 Reference equivalent threshold level
3.7 Hearing level for pure tones
3.8 Hearing threshold level for pure tones
3.9 Artificial ear
3.10 Acoustic coupler
3.11 Mechanical coupler
3.12 Masking
3.13 Otologically normal subject
4 Recommendations for specific types of audiometers
5 General requirements
5.1 Safety requirements
5.2 Warm-up time
5.3 Supply variation and environmental conditions
5.4 Unwanted acoustic radiation
6 Signal sources
6.1 Pure tone source
6.2 Speech source
6.3 Masking sounds
7 Signal level control
7.1 Marking
7.2 Accuracy of sound pressure and vibration levels
7.3 Reference level for speech
7.4 Hearing level control
7.5 Masking sound
7.6 Tone switching
8 Recommendations for reference tone facilities
8.1 Frequencies
8.2 Reference tone level control
9 Transducers
9.1 Air conduction
9.2 Bone conduction
10 Marking and instruction manual
Appendix
A Suggested subjective tests for verification of
      audiometer performance