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 389:1991 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 given in annex B.
Diese ÖNORM legt äquivalente Bezugs-Schwellenschalldruckpegel zur Kalibrierung von Reinton-Audiometern fest.