Kipp & Zonen CMA Series Instruction Manual

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Kipp & Zonen CMA Series Instruction Manual Manual pdf 20 page image

CMP/CMA series manualPage 194.14. Non-stabilityThis is the percentage change in sensitivity over a period of one year. This effect is mostly due todegradation by UV radiation of the black absorber paint on the sensing element surface. Kipp & Zonenrecommends recalibration every two years. However, for quality assurance purposes some institutes,companies or networks may require more or less frequent recalibration. Please read the chapter on thecalibration procedure for pyranometers for more information.4.15. Spectral selectivitySpectral selectivity is the variation of the dome transmittance and absorption coefficient of the blackdetector paint with wavelength and is commonly specified as % of the mean value.4.16. EnvironmentalThe CMP/CMA series are intended for outdoor use under all expected weather conditions. Theradiometers comply with IP 67 and their solid mechanical construction is suitable to be used under allenvironmental conditions within the specified ranges.4.17. UncertaintyThe measurement uncertainty can be described as the maximum expected hourly or daily uncertaintywith respect to the ‘absolute truth’. The confidence level is 95%, which means that 95% of the data-points lie within the given uncertainty interval representing the absolute value. Kipp & Zonenempirically determine uncertainty figures based on many years of field measurements.