ANSI/PIMA IT7.406:1997

Foreword
1 GENERAL
1.1 Scope
1.2 Normative references
1.3 Definitions
1.4 Classification, designation and coding
1.5 Marking for terminals, controls and polarity
1.6 User instructions
2 CONDITIONS FOR SPECIFICATIONS AND MEASUREMENTS
2.1 Rated conditions
2.2 Standard conditions for measurement
2.3 Couplers and ear simulators
2.4 Loudness comparison conditions
2.5 Ear canal sound pressure level measurement conditions
3 CHARACTERISTICS TO BE SPECIFIED AND THEIR METHODS OF
  MEASUREMENT
3.1 Power supply
3.2 Electrical impedance
3.3 Input voltage
3.4 Input power
3.5 Sound pressure (level)
3.6 Frequency response
3.7 Amplitude non-linearity
3.8 Rated climatic conditions (these are rated conditions)
3.9 External magnetic field
3.10 Unwanted sound radiation
3.11 Sound attenuation
3.12 Crosstalk attenuation for multi-channel headphones
3.13 Application force (this is a rated condition)
3.14 Physical characteristics, cables and connectors
4 CLASSIFICATION OF CHARACTERISTICS
Annex A: Specification and conditions of use of a microphone
         for use inside the ear canal
Annex B: Practical details of free-field comparison
         conditions
Annex C: Practical details of diffuse-field comparison
         conditions
Annex D: Practical details of the subjective comparison and
         ear canal sound pressure level conditions
Annex E: Bibliography

Applying to headsets, headphones, earphones and earsets intended to be used on, or in, the human ear. Also applies to equipment such as passive networks, pre-amplifiers and power supplies which form an integral part of the headphone system. Specifies the characteristics which should be included by the manufacturer in specifications and relevant methods of measurement. Classification of different types of earphone. Does not deal with: Safety - see reference IEC65[1], characteristics of microphones of headsets - see reference IEC 268-4 [2], earphones and other devices for hearing aids - see reference IEC 118-0 [3], headphones for audiometry; headphones and other devices which form part of an active ear-defender system, although some of its provisions may be applicable.