Acoustics. Determination of sound power levels and sound energy levels of noise sources using sound pressure. Survey methods using an enveloping measurement surface over a reflecting plane
State system for ensuring the uniformity of measurements. State verification scheme for instruments measuring of the spectral radiance, spectral radiant power, spectral irradiance, spectral radiant intensity, power and radiant intensity in spectral range from 0,001 to 1,600 um
Gas-fired air heaters with forced convection for firing (heating) rooms not exceeding a net heat input of 100 kW. General technical requirements and test methods
