Acoustics. Determination of sound absorption coefficient and impedance in impedance tubes - Transfer-function method1 Scope This test method covers the use of an impedance tube, two microphone locations and a digital frequency analysis system for the determination of the sound absorption coefficient of sound absorbers for normal sound incidence. It can also be applied for the determination of the acoustical surface impedance or surface admittance of sound absorbing materials. Since the impedance ratios of a sound absorptive material are related to its physical

PAS 2031:2015 establishes the certification system to be followed by certification bodies providing evaluation services in respect of installers of EEM in accordance with PAS 2030

and eliminates the concerns about climate

It specifies the database service framework and the components of the framework based on a federated database architecture commonly adopted to resolve heterogeneousness between databases

• Footholds impact test

It is applicable to installations that incorporate credit or prepayment diaphragm and ultrasonic gas meters with a capacity of 6 m³/h

The environment

It deals with the construction process from inception through to handover of the completed facility to the owner

BS 8213-4 gives recommendations for the good practices necessary for the successful surveying and installation of windows and external door sets in both new build and replacement situations

Who is PD CLC/TR 62453-51-32 - FDT object model for

where windows are to be operated by young children

Cost control

inspection of end items