ANSI/ASA S1.18-1999 (R2004)
This American National Standard describes procedures for obtaining the real and imaginary parts of the specific acoustic impedance of natural ground surfaces outdoors. The Standard uses templates to compare measured sound pressure level differences with a specific set of calculated level differences. The impedance values are obtained from a model based on best fit of measured and calculated level differences. The Standard may be used to obtain the impedance of porous sound absorbing material.
Cart
(empty)
New products
- BS PD ISO/TS 7127:2023
- BS PD ISO/TS 9491-1:2023
- BS PD IEC TS 62898-3-4:2023
- BS PD ISO/TS 24665:2023
- BS PD ISO/TR 14644-21:2023
- BS PD ISO/IEC TS 30105-9:2023
- BS PD ISO/IEC TS 27560:2023
- BS 8636:2023
- BS PD ISO/TR 9839:2023
- BS PD IEC TR 63222-100:2023
- BS PD ISO/TR 37178:2023
- BS PD IEC TS 62998-3:2023
- BS PD IEC TS 61496-5:2023
- BS PD ISO/TR 15377:2023
- BS PD IEC TR 63415:2023
- BS PD ISO/IEC TR 7052:2023
- BS PD CLC/TS 50600-5-1:2023
- BS PD IEC TS 61400-30:2023
- BS PD ISO/TS 11686:2023
- BS PD CEN/TS 17959:2023
- BS PD ISO/PAS 24644-1:2023
- BS PD ISO/TR 9464:2023
- BS PD ISO/PAS 18940-1:2023
- BS PD ISO/TR 12770:2023
- BS PD IEC TS 62915:2023
