A fully anechoic chamber (FAC) is defined in the CISPR 16-1-4 standard as a "test chamber without a grounded floor". Compared to a semi-anechoic chamber (SAC), in this chamber, not only the walls and ceiling, but also the floor are lined with absorbers. The main advantage of the FAC camera is that there are no reflections from the floor, and therefore it is not necessary to perform a height scan using an antenna, which can save a lot of time for making measurements. However
