This International Standard applies to X-RAY TUBE ASSEMBLIES either with a rotating ANODE XRAY TUBE or a stationary ANODE X-RAY TUBE, intended for use in medical diagnosis. For an X-RAY TUBE HEAD, its X-RAY TUBE ASSEMBLY aspects are also within the scope. This International Standard covers performance-related definitions and conditions of electrical and LOADING characteristics of X-RAY TUBE ASSEMBLIES in relation to their behaviour during and after energization and, where appropriate, methods of presentation and measurement of these characteristics. This International Standard is therefore relevant for the MANUFACTURER and the RESPONSIBLE ORGANIZATION. NOTE “Measurement" in this standard is always related to practical use. Consequently, “measurement" is meant to consume only a negligible part of the life of the X-RAY TUBE ASSEMBLY.