標準號：IS 11024-1984
發布日期：1985/1/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍： This standard specifies the following data applicable to the calibra-tion of bone vibrators for pure-tone bone-conduction audiometry:a) Reference equivalent threshold force levels ( RETFL ),corresponding to the threshold of hearing of young otologically normal persons ( see 2.9 and 2.10 ) by bone-conduction audio-metry. RETFL is the alternating force level transmitted to a mechanical coupler of specified characteristics, see 3.2.3, by a vibrator when applied to the mechanical coupler under stated conditions of test and when energized at the level corresponding to the normal threshold of hearing for mastoid placement.Note — Corresponding values for forehead placement of the vibrator are under development for ultimate inclusion in this standard. Provisional values are included for information in Appendix C.b) Essential characteristics of the bone vibrator and of its method of coupling to a person under test and to the mechanical coupler.c) Essential characteristics and datum level of the masking noise applied to the non-test ear.