本文件规定了用针孔摄像法和数字评估法测量1000kv管电压以下X射线系统0.1mm以上有效焦点尺寸的方法。用于此测量的管电压限制为200 kV，用于视觉胶片评估，如果使用数字探测器，则可选择高于200 kV的管电压。 X射线图像的成像质量和分辨率在很大程度上取决于有效焦点的特性，特别是从探测器平面上看的尺寸和二维强度分布。与EN 12543系列中的其他方法相比，这种方法可以获得焦点的图像并查看焦点的状态（例如。 g、 阳极凹陷）。 本试验方法提供了测定工业X射线管标准（大焦点）和小焦点有效尺寸（尺寸）的说明。该测定基于已用“针孔”技术进行射线照相记录并用数字方法进行评估的焦点图像的测量。 对于商业X射线管类型的表征（即广告或贸易），建议使用附录A中的特定FS（焦点）值。

This document specifies a method for the measurement of effective focal spot dimensions above 0,1 mm of X-ray systems up to and including 1000 kV tube voltage by means of the pinhole camera method with digital evaluation. The tube voltage applied for this measurement is restricted to 200 kV for visual film evaluation and may be selected higher than 200 kV if digital detectors are used. The imaging quality and the resolution of X-ray images depend highly on the characteristics of the effective focal spot, in particular the size and the two dimensional intensity distribution as seen from the detector plane. This method compared to the others in the EN 12543 series allows to obtain an image of the focal spot and to see the state of it (e.g. cratering of the anode). This test method provides instructions for determining the effective size (dimensions) of standard (macro focal spots) and mini focal spots of industrial X-ray tubes. This determination is based on the measurement of an image of a focal spot that has been radiographically recorded with a "pinhole" technique and evaluated with a digital method. For the characterization of commercial X-ray tube types (i.e. for advertising or trade) it is advised that the specific FS (Focal spot) values of Annex A are used.