Railway applications. Track. Noise barriers and related devices acting on airborne sound propagation. Test method for determining the acoustic performance - Intrinsic characteristics. In situ values of sound diffraction under direct sound field1 Scope This European Standard describes a test method for determining the intrinsic characteristics of sound diffraction of added devices installed on the top of railway noise barriers. The test method prescribes measurements of the sound pressure level at several reference points near the top edge of a noise barrier with and without the added device installed on its top. The intrinsic effectiveness of the added device is calculated as the difference

1C and 1CX which are suitable for international exchange and for conveyance by road

30 µg/kg and 0

explanations and recommendations

It specifies the calibration of laser vibrometer standards designated for the calibration of either laser vibrometers or mechanical vibration transducers in accredited or non-accredited calibration laboratories

BS EN 61212-3-2:2013 supersedes EN 61212-3-2:2006

or economically motivated adulteration

molten steel is poured into a mould surrounding the gap between the rail ends to be joined

Why should you use BS EN 16272-4 - Characteristics of sound diffraction of added devices on noise barriers

you can calculate the bond strength between PDMS and glass that results in manufacturing better quality semiconductor devices

BS EN 61988-4 on Climatic and mechanical test methods for Plasma display panels is useful for:

including contaminants

these operations being under the responsibility of an approved manufacturer or supplier