When using the UV light meter, be mindful of the surrounding temperature.
When using, care must be taken to avoid receiving strong light, because the cathode of the phototube is exposed to strong light for a long time, fatigue will occur, and the emission of the photocathode will be abnormal. Therefore, the protective cover of the window should be covered when the illuminance meter is not used. In addition, the ambient temperature of the ultraviolet illuminance meter should not be very high or low. Especially the ultraviolet illuminance meter that uses thermoelectric effect elements as the receiver has stricter requirements on the ambient temperature (generally at 20°C); and when the photoelectric cell GD-5 is used as the receiver, the requirements on the ambient temperature are not very strict. Generally speaking, the lower the temperature, the better; to reduce the dark current. In addition, when measuring the radiation of the light source, it should be perpendicular to the window of the receiver. If it is tilted, it will produce a large error. Angle correction is required at this time.
