ANSI ASA S3.39-1987 American National Standard Specifications for Instruments to Measure Aural Acoustic Impedance and Admittance (Aural Acoustic Immittance)《测量声阻抗和导纳用仪器规格(听觉阻纳)》.pdf
Reaffirmed by ANSI April 22, 2002 Reaffirmed by ANSI May 18, 2007 Reaffirmed by ANSI June 15, 2012