ASTM International - ASTM C384-03
Standard Test Method for Impedance and Absorption of Acoustical Materials by the Impedance Tube Method
|Publication Date:||10 September 2003|
|ICS Code (Acoustics in building. Sound insulation):||91.120.20|
1.1 This test method covers the use of an impedance tube, alternatively called a standing wave apparatus, for the measurement of impedance ratios and the normal incidence sound absorption coefficients of acoustical materials.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
1.3 The values stated in SI units are to be regarded as the standard.