Derating

In electrical and electronic equipment, when parameters such as output current are close to the upper or lower limits of the rated values, poor usage conditions can adversely affect the equipment, leading to loss of accuracy or potential failure. Therefore, when using equipment under adverse environments such as high temperatures or high altitudes, the concept of using the rated values with a margin—such as lowering the usage range of parameters like output current below the rated upper limits—is applied to ensure reliability and prevent failure. Derating may also be applied in normal environments to enhance the reliability of the equipment and prevent failure.