Acoustics. Measurement of sound absorption properties of road surfaces in situ - Extended surface method Ingestion-build-63114 that are made by using

that are made by using a combination of these tissue-making processes

The measurement accuracy is within 0

4 Principle

BS EN 50647 provides the basic standard for the evaluation of workers' exposure to electric and magnetic fields from equipment and installations for the production

Acoustics. Measurement of sound absorption properties of road surfaces in situ - Extended surface method Ingestion-build-63114 that are made by using1 Scope This part of ISO 13472 describes a test method for measuring in situ the sound absorption coefficient of road surfaces as a function of frequency in the range from 250 Hz to 4 kHz. Normal incidence is assumed. However, the test method can be applied at oblique incidence although with some limitations (see annex F). The test method is intended for the following applications: determination of the sound absorption properties of test tracks