The impact of environmental and background radiation: When conducting infrared detection of outdoor power equipment, the infrared radiation received by the detection instrument not only includes the radiation emitted by the corresponding parts of the tested equipment itself, but also includes reflections from other parts of the equipment and the background, as well as direct sunlight radiation. These radiations will cause interference with the temperature of the tested part of the equipment and bring errors to fault detection. In order to reduce the impact of environmental and background radiation, when conducting on-site infrared testing of outdoor electrical equipment, it is best to choose to conduct it on cloudy days or when there is no light at sunset. This can prevent the impact of direct incident, reflected, and scattered solar radiation; For indoor equipment, it is possible to turn off the lighting and avoid the impact of other radiation. For highly reflective equipment surfaces, appropriate measures should be taken to reduce the impact of solar radiation and surrounding high-temperature object radiation, or to change the detection angle and find a best angle to avoid reflection for detection. In order to reduce the impact of solar radiation and surrounding high-temperature background radiation, appropriate shielding measures should be taken during detection, or appropriate infrared filters should be installed on infrared measuring instruments to filter out solar and other background radiation. Select instruments with appropriate parameters and detection distances for testing, so that the tested equipment is within the field of view of the instrument, thereby reducing interference from background radiation.