Installing and Calibrating Loop Amplifiers to EN81-70 so that Test Certificates can be Produced for Audio Frequency Induction Loop Systems (AFILS) in Accordance with BS EN 60118-4

John Trett

Wednesday 21st September 2016

Service providers have to make "reasonable adjustments" to the physical barriers to gain access in all buildings. The summary of main provisions for disabled access includes: f) Emergency telephone and inductive coupler for hearing aid users. Inductive loop amplifiers need to be installed and calibrated correctly so that test certificates can be produced for Audio Frequency Induction Loop Systems (AFILS) in accordance with BS EN 60118-4. If they are not powerful enough or incorrectly set up they produce distorted sounds. Often, installed systems are simply a loop behind the Car Operating Panel (COP) with limited range, so they cannot be heard by a deaf person at the other side of the car or collapsed on the floor. This leaves users with impaired hearing at a dangerous disadvantage as they cannot hear normal and telephone lift messages. This paper provides guidance on how existing loop amplifier specifications and installations can be improved.

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