The error from the set up of the pyranometer (i.e. the orientation of the pyranometer relative to the glass window surface) is estimated to be no greater than 4 in vertical plane and horizontal plane.
The total uncertainty is then estimated to be about ±8.12% of the measured incident solar radiation.
For the measured diffuse solar radiation, the additional error from the set up of the shading ring is estimated to be ±0.5% of the measured solar radiation.
As a result, for the diffuse solar radiation, the total uncertainty is estimated to be about ±8.20% of the measured diffuse
solar radiation.
For the transmitted solar radiation,the additional error from the set up of the pyranometer comes from the accuracy in setting the slat angle of the blind.
The accuracy in setting the slat angle is estimated to be within 4.
The total uncertainty is estimated to be about ±9.23% of the measured transmitted solar radiation.