BS EN 60268-7:2011 pdf download – Sound system equipment – Part 7: Headphones and earphones
1 scope
This part of lEC 60268,is applicable to headphones，headsets，earphones and earsets,intended to be used on, or in, the human ear. It also applies to equipment, such as pre-amplifiers,passive networks and power supplies which form an integral part of the headphone system.
lt does not deal with:
a) safety, for which reference should be made to lEC 60065 or another appropriate standard;
b) the characteristics of microphones of headsets，for which reference should be made toIEC 60268-4;
c) earphones and other devices for hearing aids, for which reference should be made toIEC 60118-0;
d) headphones for audiometry;
e) headphones and other devices which form part of an active ear-defender system, although some of its provisions may be applicable.
This standard specifies the characteristics which should be included by the manufacturer inspecifications, and relevant methods of measurement. It includes a classification of the differenttypes of earphone，mainly characterized by the way in which the transducer is coupledacoustically to the ear, and a classification code which may also be used for marking.
2Normative references
The following referenced documents are indispensable for the application of this document.Fordated references, only the edition cited applies.For undated references, the latest edition of thereferenced document (including any amendments) applies.
IEC 60038,IEC standard voltages
IEC 60050(801):1994,International Electrotechnical Vocabulary- Chapter 801:Acoustics andelectroacoustics
IEC 60068-1，Environmental testing – Part 1: General and guidanceIEC 60086-1,Primary batteries – Part 1: General
IEC Guide 106, Guide for specifying environmental conditions for equipment performancerating
IEC 60263, Scales and sizes for plotting frequency characteristics and polar diagrams
IEC 60268-1,Sound system equipment – Part 1: General
IEC 60268-2, Sound system equipment – Part 2:Explanation of general terms and calculationmethods
IEC 60268-11, Sound system equipment – Part 11: Application of connectors for theinterconnection of sound system components
IEC 60268-12,Sound system equipment – Part 12:Application of connectors for broadcastand similar use
IEC 60711，Occluded-ear simulator for the measurement of earphones coupled to the ear byear inserts1
IEC TR 60959，Provisional head and torso simulator for acoustic measurements on airconduction hearing aids2
IEC 61672-1,Electroacoustics – Sound level meters – Part 1: Specifications
ISo 3741,Acoustics – Determination of sound power levels of noise sources using soundpressure – Precision methods for reverberation rooms
IS0 4869-1，Acoustics – Hearing protectors – Part 1: Subjective method for the measurementof sound attenuation
ISo 4869-3， Acoustics – Hearing protectors – Part 3: Measurement of insertion loss ofear-muff type protectors using an acoustic test fixture
ISO7619-1，Rubber, vulcanized and thermoplastic – Determination of indentation hardness -Part 1: Durometer method (Shore hardness)
3Terms and definitions
For the purposes of this document，the following terms and definitions apply，see alsolEC60050-801(IEV).
NOTE Any device defined in 3.1 to 3.15 and their connector(s) for electrical input should be regarded as part of thetransducer.
3.1
earphone
electroacoustic transducer by which acoustic oscillations are obtained from electric signals andintended to be closely coupled acoustically to the ear
[IEV 801-27-18]
3.2
headphone
assembly of one or two earphones on a headband or chinband, the use of which may be optional(e.g. with intra-concha earphones)
3.3
headset
headphones equipped with a microphone
3.4
earset
earphones equipped with a microphone