scope:

This part of IEC 60268 applies to transducers converting an electrical input signal into a mechanical or acoustical output signal. However, if the electrical input terminals and the surface of the radiator are accessible, this document can also apply to passive and active sound systems such as loudspeakers, headphones, TV-sets, multi-media devices, personal portable audio devices, automotive sound systems and professional equipment. This document describes only electrical and mechanical measurements that help assess the transfer behaviour of the device under test (DUT). This includes operating the DUT in both the small- and largesignal domains. The influence of the target application's acoustical boundary conditions (e.g. car interior) can also be considered in the physical evaluation of the sound system. Perception and cognitive evaluations of the reproduced sound and the impact of perceived sound quality are outside the scope of this document.

NOTE This document does not apply to microphones and other sensors. Implementation of this document does not require access to the sound pressures generated in the near or far fields of the radiator. Directivity and other characteristics describing the electro-acoustical transfer properties are described in IEC 60268-21, which covers acoustical measurements.The practical application of the measurements for research and development (R&D), endof- line testing (QC) and evaluation in the final target application (TA) is discussed in Annex A.