Brewer Spectrometer Wiki

UV results in the irradiance over the “B” region of the spectrum to be measured. The zenith prism is rotated to the UV dome, FW#2 is set to the 1 position, FW#1 is set to the 3 position, the iris is opened, and the tracker is pointed toward the sun. The UV spectrum is then scanned in steps of 0.5nm from 290nm to 325nm, and then back to 290 nm. The data is appended to a UVJJJYY.nnn data file. When scanning is complete, a calculation of the UVB/UVA McKinley- Diffey weighted irradiance is computed, sent to the printer and to the monitor screen, and appended to the DUVJJJYY.nnn data file. A correction is made to the Diffey action spectrum to include the effects of the UVA region 325-400nm).