IEC 60336 pdf download Medical electrical equipment – X-ray tube assemblies for medical diagnosis – Characteristics of focal spots This International Standard applies to FOCAL SPOTs in medical diagnostic X-RAY TUBEassemblies for medical use, operating at X-RAY TUBE VOLTAGEs up to and including 200 kV. This International Standard describes the test methods for evaluating FocAL sPOT character-istics and the means...