Metrologi och mätning. Fysikaliska fenomen

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: CEN
Svarsdatum: den 30 maj 2023
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This part of ISO 13165 specifies the determination of radium-226 (226Ra) activity concentration in all types of water by coprecipitation followed by gamma-spectrometry (see ISO 18589-3[7]).
The method described is suitable for determination of soluble 226Ra activity concentrations greater than 0,02 Bq l−1 using a sample volume of up to 100 l of any water type.
For water samples smaller than a volume of 1 l, direct gamma-spectrometry can be performed following ISO 10703with a higher detection limit.
NOTE This test method can be adapted to determine other naturally occurring isotopes of radium, such as 223Ra, 224Ra, and 228Ra if the respective ingrowth periods are taken into account.

Ämnesområden: Färg- och ljusmätning
Kommittébeteckning: SIS/TK 380 (Ergonomi och human factors)
Källa: CEN
Svarsdatum: den 7 jun 2023
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This part of ISO/CIE 11664 specifies the method of calculating the coordinates of the CIE 1976 L*u*v* colour space including correlates of lightness, chroma, saturation and hue. It includes two methods for
calculating Euclidean distances in this space to represent the relative perceived magnitude of colour differences. It also specifies the method of calculating the coordinates of the u′,v′ uniform chromaticity scale diagram.
This part of ISO/CIE 11664 is applicable to tristimulus values calculated using the colour-matching functions of the CIE 1931 standard colorimetric system or the CIE 1964 standard colorimetric system.
This part of ISO/CIE 11664 may be used for the specification of colour stimuli perceived as belonging to a reflecting or transmitting object, where a three-dimensional space more uniform than tristimulus space is required. This includes self-luminous displays, like computer, television and smart-phone
displays, if they are being used to simulate reflecting or transmitting objects and if the stimuli are appropriately normalized. This part of ISO/CIE 11664, as a whole, does not apply to colour stimuli perceived as belonging to an area that appears to be emitting light as a primary light source or that
appears to be specularly reflecting such light. Only the u′,v′ uniform chromaticity scale diagram defined in 4.1 and the correlates of hue and saturation defined in 4.3 apply to such colour stimuli.

Kommittébeteckning: SIS/TK 197 (Byggnadsakustik)
Källa: CEN
Svarsdatum: den 19 jun 2023
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This document specifies methods for measuring the sound pressure level from service equipment in a building or from other sound sources inside or outside of the building. This document specifically covers measurements of sanitary installations, mechanical ventilation, heating and cooling service
equipment, lifts, rubbish chutes, boilers, blowers, pumps and other auxiliary service equipment, and motor driven car park doors; however, it can also be applied to measurements of equipment or activities in in or nearby a building. To include noise from sport facilities, pubs etcetera inside or outside the
building. The measurement of noise from external sound sources generating ground-borne noise are not included in this standard.
The methods are suitable for rooms with volumes of approximately 300 m3 or less e.g. in dwellings, hotels, schools, offices and hospitals. The standard is generally not intended for measurements in large auditoriums and concert halls, nor where the source is located at a distance from the building
where sound propagation may change with weather conditions. However, the operating conditions and operating cycles in Annex B can be used in such cases.
The service equipment sound pressure level is determined as the maximum A-weighted and optionally C-weighted sound pressure level occurring during a specified operation cycle of the service equipment under test, or as the equivalent continuous sound pressure level in one–third–octave bands determined with a specified integration time. A-weighted and C-weighted values are calculated from one–third– octave–band measurements or optionally from octave–band measurements.