scope:

Specifies requirements for audiometers or parts thereof designed to provide a means of presenting speech sounds to a subject in a standardized manner, e.g. for the measurement of speech recognition. The purpose is to ensure that tests of hearing using speech as the test stimulus, on a given human ear performed with different audiometers which comply with this standard, shall give substantially the same results for a given calibration method. Two methods of specification, calibration and testing are given for the output levels generated by the earphones and the bone vibrator.