ASTM C 384 Standard Test Method for Impedance and Absorption of Acoustical Materials by the Impedance Tube Method
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ASTM C 384 Document Information:
Title
Standard Test Method for Impedance and Absorption of Acoustical Materials by the Impedance Tube Method
ASTM International
Publication Date:
Apr 1, 2004
Scope:
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.
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.
The values stated in SI units are to be regarded as the standard.
Keywords:
- absorption
- impedance
- impedance ratio
- impedance tube
- normal incidence sound absorption coefficient
- specific normal acoustic impedance
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