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3 Electrical equipment
Same principles for selection and application apply for MO surge arresters on d
BS EN 3894 specifies the requirements relating to:
the density values of water and isopropanol should be determined
Acoustics. Sound-scattering properties of surfaces - Measurement of the directional diffusion coefficient in a free field Ingestion-build-44616 3 Electrical equipment1 Scope This part of ISO 17497 specifies a method of measuring the directional diffusion coefficient of surfaces. The diffusion coefficient characterizes the sound reflected from a surface in terms of the uniformity of the reflected polar distribution. The diffusion coefficient is a measure of quality designed to inform producers and users of surfaces that, either deliberately or accidentally, diffuse sound. It can also inform developers and users of