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 14033-2 covers standard

BS EN 14033-2 covers standard references that help prevent track failure and derailment

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

complying with ISO 9801

Terminal categories and summarized measurement conditions

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 14033-2 covers standard1 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