Acoustics. Reference zero for the calibration of audiometric equipment - Reference levels for narrow-band masking noise1 Scope This part of ISO 389 specifies reference levels for narrow band masking noise presented by air conduction from an earphone in pure tone audiometry. The data are given in terms of levels to be added to the reference equivalent threshold sound pressure levels for the corresponding pure tone frequencies as specified in ISO 389: 1991 or ISO 389 2, respectively, when the masking earphone is placed on the appropriate acoustic coupler, ear simulator

this part of ISO 17972 also defines additional requirements for a valid CxF/X file

but not more than 300 V a

Any entity responsible for testing of Radio frequency identification

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