Acoustics. Reference zero for the calibration of audiometric equipment - Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones Ingestion-build-82061 BS EN 50625-2-1 also applies

BS EN 50625-2-1 also applies to all facilities including those whose treatment operations use mobile equipment

BS EN 62137-1-5 stipulates the technicalities such as related terms and definitions

Terminal categories and summarized measurement conditions

complying with ISO 9801

Before being installed

Acoustics. Reference zero for the calibration of audiometric equipment - Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones Ingestion-build-82061 BS EN 50625-2-1 also applies1 Scope This document specifies a standard reference zero for the scale of hearing threshold level applicable to pure tone air conduction audiometers, to promote agreement and uniformity in the expression of hearing threshold level measurements throughout the world. It states the information in a form suitable for direct application to the calibration of audiometers, that is, in terms of the reference equivalent threshold sound pressure levels of