The PMOD/WRC has a roof platform which allows a large number of instruments to be installed for intercomparison campaigns or long-term monitoring of radiation and atmospheric parameters.
The absolute calibration of a broadband filter radiometer should be performed with a radiation source having a similar spectral distribution to the radiation for which the radiometer will be used. For the case of solar measurements this requirement implies that the calibration has to be done using the sun as a source since the spectral distribution and variability of the surface solar radiation cannot be simulated in the laboratory with the required accuracy.
