Guide to UV Measurement
Temperature
Wide swings in the internal temperature of the photo detector(s) used in instruments may lead to small differences between readings. Check with your instrument manufacturer - the response of detectors varies as the temperature increases. Repeated, long, slow data collection runs under intense multi-lamp UV sources tend to increase the temperature of the detector and may cause small variations in the amount of UV measured. Let the radiometer cool for a few minutes between runs and try to be consistent when making repeated, long, slow readings under very intense sources.