Acoustics. Reference zero for the calibration of audiometric equipment - Reference equivalent threshold sound pressure levels for pure tones and insert earphones Ingestion-build-47182 The required levels are to

The required levels are to be found in local regulations or non-conflicting standards

and propylene

Common forms of eyewear include glasses (also called eyeglasses or spectacles)

PD CEN/TR 15339-4 should be used in conjunction with CEN/TR 15339-1

general purpose (code B)

Acoustics. Reference zero for the calibration of audiometric equipment - Reference equivalent threshold sound pressure levels for pure tones and insert earphones Ingestion-build-47182 The required levels are to1 Scope This part of ISO 389 specifies reference equivalent threshold sound pressure levels (RETSPL) for the calibration of pure tone audiometers supplementary to those specified in ISO 389: 19911). Values given in this part of ISO 389 are applicable to insert earphones of a pattern specified in clause 4. NOTE 1 For information, a note on the derivation of the reference values and the origin of the data input is given in annex A, and a bibliography is