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CALIBRATION
A zero offset was also embodied in the response due to illumination. To
correct for this unwanted response, the zero offset read after 60 s shading is
subtracted.
6.3.5 Traceability to World Radiometric Reference
Working standard pyranometers are maintained at Kipp & Zonen. Each
standard pyranometer is characterised.
Linearity, temperature dependence curve and directional response are well
known.
The working standard pyranometers are calibrated each year at the World
Radiation Centre in Davos, Switzerland, periodically according to the
component method.
An extended calibration certificate, mentioning the Davos procedure, is
available.
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