BS EN 60118-13:2011 pdf download – Electroacoustics — Hearing aids Part13: Electromagnetic compatibility (EMC)
This part of IEC 601 1 8 in principle covers all relevant EMC phenomena for hearing aids. EMC phenomena, such as RF emission and electrostatic discharge, are not currently known to be a significant problem in connection with hearing aids and are therefore not dealt with. Based on new knowledge, they could be considered in connection with future revisions or extensions of this standard. Hearing aid immunity to high frequency electromagnetic fields originating from digital wireless devices operating in the frequency ranges 0,8 GHz to 0,96 GHz and 1 ,4 GHz to 2,48 GHz is currently identified as the only relevant EMC phenomenon regarding hearing aids. Future editions of this part of IEC 601 1 8 may add tests for other frequency bands, as they come into more common use. IEC 61 000-4-3 is the basis for relevant EMC tests to be conducted on hearing aids. Measurement methods and acceptance levels are described in this part of IEC 601 1 8. For the purpose of this part of IEC 601 1 8, two immunity classes of hearing aids are defined (see 3.1 ) related to their use. “Bystander compatible” ensures that a hearing aid is usable in environments where digital wireless devices are in operation in the proximity of the hearing aid wearer. “User compatible” hearing aids ensures that a hearing aid is usable when the wearer is using a digital wireless device at the wearer’s own aided ear. Measurement methods for hearing aids with non-acoustic outputs and for hearing aids connected to other equipment by cables are not given in this standard.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 601 1 8-0, Hearing aids – Part 0: Measurement of electroacoustical characteristics
IEC 601 1 8-2, Hearing aids – Part 2: Hearing aids with automatic gain control circuits
IEC 601 1 8-7, Electroacoustics – Hearing aids – Part 7: Measurement of the performance
characteristics of hearing aids for production, supply and delivery quality assurance purposes
IEC 6031 8-4, Electroacoustics – Simulators of human head and ear – Part 4: Occluded-ear simulator for the measurement of earphones coupled to the ear by means of ear inserts
IEC 6031 8-5, Electroacoustics – Simulators of human head and ear – Part 5: 2 cm 3 coupler for the measurement of hearing aids and earphones coupled to the ear by means of ear inserts
IEC 61 000-4-3, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measurement techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61 000-4-20, Electromagnetic compatibility (EMC) – Part 4-20: Testing and measurement techniques – Emission and immunity testing in transverse electromagnetic (TEM) waveguides
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 601 1 8-0, IEC 601 1 8-7, and IEC 61 000-4-3 as well as the following apply.
3.1 hearing aid wearable instrument, containing a variety of individual adjustment facilities, intended to aid a person with impaired hearing. Consisting of a microphone, amplifier, an induction pick-up coil (optional) and earphone, powered by a battery NOTE Hearing aids can be placed on the body (BW), behind the ear (BTE) or in the ear (ITE).
3.2 bystander compatibility immunity of a hearing aid that ensures it is usable in environments where digital wireless devices are in operation in the proximity of the hearing aid wearer (2 m, see A.4)
3.3 user compatibility immunity of a hearing aid that ensures it is usable when the wearer is using a digital wireless device at the wearer´s own aided ear
3.4 reference orientation (of a hearing aid) orientation of the hearing aid with respect to the RF emitting source which corresponds to the orientation of the hearing aid under actual use on a person facing or using an RF emitting source
input related interference level
level used to characterise the immunity of the hearing aid