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 complying with ISO 9801

complying with ISO 9801

it is recommended to use a test method to determine MN for the gas

Terminal categories and summarized measurement conditions

BS EN 61869-1:2009 Instrument transformers

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 complying with ISO 98011 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