SN EN 60268-5 : 2003
Current
The latest, up-to-date edition.
1 Scope<br>2 Normative references<br>3 Conditions for measurement<br> 3.1 General conditions<br> 3.2 Measuring conditions<br>4 Test signals<br> 4.1 General<br> 4.2 Sinusoidal signal<br> 4.3 Broadband noise signal<br> 4.4 Narrow-band noise signal<br> 4.5 Impulsive signal<br>5 Acoustical environment<br> 5.1 General<br> 5.2 Free-field conditions<br> 5.3 Half-space free-field conditions<br> 5.4 Diffuse sound field conditions<br> 5.5 Simulated free-field conditions<br> 5.6 Half-space simulated free-field conditions<br>6 Unwanted acoustical and electrical noise<br>7 Positioning of loudspeaker and measuring microphone<br> 7.1 Measuring distance under free-field and half-space<br> free-field conditions<br> 7.2 Positioning of loudspeaker in diffuse field conditions<br> 7.3 Positioning of loudspeaker and microphone in simulated<br> free-field conditions<br>8 Measuring equipment<br>9 Accuracy of the acoustical measurement<br>10 Mounting of loudspeakers<br> 10.1 Mounting and acoustic loading of drive units<br> 10.2 Mounting and acoustic loading of a loudspeaker system<br>11 Standard baffle and measuring enclosures<br> 11.1 Standard baffle<br> 11.2 Standard measuring enclosures<br>12 Preconditioning<br>13 Type description<br> 13.1 General<br> 13.2 Loudspeaker drive units<br> 13.3 Loudspeaker system<br>14 Marking of terminals and controls<br>15 Reference plane, reference point and reference axis<br> 15.1 Reference plane - characteristic to be specified<br> 15.2 Reference point - characteristic to be specified<br> 15.3 Reference axis - characteristic to be specified<br>16 Impedance and derivative characteristics<br> 16.1 Rated impedance - characteristic to be specified<br> 16.2 Impedance curve<br> 16.3 Total Q-factor (Q[t])<br> 16.4 Equivalent air volume of a loudspeaker drive unit<br> compliance (v[as])<br>17 Input voltage<br> 17.1 Rated noise voltage<br> 17.2 Short-term maximum input voltage<br> 17.3 Long-term maximum input voltage<br> 17.4 Rated sinusoidal voltage<br>18 Input electrical power<br> 18.1 Rated noise power - characteristic to be specified<br> 18.2 Short-term maximum power - characteristic to<br> be specified<br> 18.3 Long-term maximum power - characteristic to be specified<br> 18.4 Rated sinusoidal power - characteristic to be specified<br>19 Frequency characteristics<br> 19.1 Rated frequency range - characteristic to be specified<br> 19.2 Resonance frequency<br> 19.3 Tuning frequency of a bass reflex or passive radiator<br> loudspeaker system - characteristic to be specified<br>20 Sound pressure under free-field and half-space free-field<br> conditions<br> 20.1 Sound pressure in a stated frequency band<br> 20.2 Sound pressure level in a stated frequency<br> band - characteristic to be specified<br> 20.3 Characteristic sensitivity in a stated frequency band<br> 20.4 Characteristic sensitivity level in a stated frequency<br> band - characteristic to be specified<br> 20.5 Mean sound pressure in a stated frequency band<br> 20.6 Mean sound pressure level in a stated frequency band -<br> characteristic to be specified<br>21 Response under free-field and half-space free-field conditions<br> 21.1 Frequency response<br> 21.2 Effective frequency range<br> 21.3 Transfer function<br>22 Output power (acoustic power)<br> 22.1 Acoustic power in a frequency band<br> 22.2 Mean acoustic power in a frequency band<br> 22.3 Efficiency in a frequency band<br> 22.4 Mean efficiency in a frequency band<br>23 Directional characteristics<br> 23.1 Directional response pattern<br> 23.2 Radiation angle<br> 23.3 Directivity index<br> 23.4 Coverage angle or angles<br>24 Amplitude non-linearity<br> 24.1 Total harmonic distortion<br> 24.2 Harmonic distortion of the nth order (where n=2 or n=3)<br> 24.3 Characteristic harmonic distortion<br> 24.4 Modulation distortion of the nth order<br> (where n=2 or n=3)<br> 24.5 Characteristic modulation distortion of nth order<br> (where n=2 or n=3)<br> 24.6 Difference frequency distortion (of the second<br> order only)<br>25 Rated ambient conditions<br> 25.1 Temperature ranges<br> 25.2 Humidity ranges<br>26 Stray magnetic fields<br> 26.1 Static components<br> 26.2 Dynamic components<br>27 Physical characteristics<br> 27.1 Dimensions<br> 27.2 Mass<br> 27.3 Cable assemblies<br>28 Design data<br>29 Indication of the characteristics to be specified<br>Annex A (informative) Standard measuring enclosure type A<br>Annex B (informative) Standard measuring enclosure type B<br>Annex C (informative) Definitions of terms used in Clause 13<br>Annex ZA (normative) Normative references to international<br> publications with their corresponding<br> European publications<br>Bibliography
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