reference: R048:2004 2.5

ID: 00405

difference between the radiance temperature values obtained across the surface of the tungsten ribbon in the field of view. The temperature inhomogeneity is characterized by a maximum variation in temperature values obtained as a result of measurements when observing along and across the ribbon within the marked area relative to the position determined by the index and the center of the ribbon after the field of view has been displaced within the specified limits