DS EN 12543-4:1999
DS EN 12543-4:1999 Non-Destructive Testing - Characteristics Of Focal Spots In Industrial X-Ray Systems For Use In Non-Destructive Testing - Part 4: Edge Method Defines the checking of focal spot dimensions above 0.5 mm of X-ray systems up to and including 500 kV tube voltage, by means of radiographs of sharp edges.