All quv and q-sun testers come with a black panel temperature sensor to monitor and accurately maintain temperature within the tester. For some q-sun models, a chamber air temperature sensor can be substituted or used simultaneously.
the black panel temperature sensor in the tester needs to be calibrated periodically. For the quv tester, this is accomplished simply by using any reference thermometer. In the case of the q-sun testers, a special reference black panel thermometer must be used. The reference thermometer itself needs to be calibrated once per year.
all quv and q-sun testers are equipped with the solar eye irradiance control system (except for the quv/basic tester). The solar eye system monitors and accurately maintains irradiance levels within the tester.
the sensor within the solar eye system must be calibrated by the user periodically. This is accomplished with a special calibration radiometer. This radiometer itself needs to be calibrated once per year.