Kippzonen CHP 1 Pyrheliometer Uživatelský manuál stáhnout pdf (Strana 14)

6.4 Non-stability

This is the percentage change in sensitivity over a period of one year. This effect is mostly due to degradation by UV

radiation of the black absorber paint on the sensing element surface. Kipp & Zonen recommends 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 the calibration procedure for pyrheliometers for more

information.

6.5 Spectral selectivity

Spectral selectivity is the variation of the window transmittance and absorption coefficient of the black detector

paint with wavelength and is commonly specified as a % of the mean value.

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Kippzonen CHP 1 Pyrheliometer Uživatelský manuál Strana 14