All fluoroscopic imaging systems, both conventional and digital, now incorporate methods for some form of automated control of the exposure used to produce an image. These automated facilities can vary greatly in their design and operation. It is felt that the design criteria for such devices seldom embody optimisation in the sense implied by the ALARA Principle and there is little or no quality assurance performed on such devices. This paper details protocols established by the authors to assess the performance of a number of AEC systems, including those controlling TV, cine, digital, 100mm and spot film. Assessments include measuring the typical exposures used and measures of the image quality produced. Finally the importance of user training where such systems are employed will be highlighted.