电子设备用固定电阻器.第8部分:分规范.表面安装固定电阻器

[中文适用范围]： IEC 60115 的这一部分适用于电子设备中使用的固定表面贴装电阻器。这些电阻器通常根据类型（不同的几何形状）和样式（不同的尺寸）来描述。它们具有金属化端子，主要用于直接安装到电路板上。 [外文原描述]： IEC 60115-8:2009 is applicable to fixed surface mount resistors for use in electronic equipment. These resistors are typically described according to types (different geometric shapes) and styles (different dimensions). They have metallized terminations and are primarily intended to be mounted directly on to a circuit board. The major technical changes with regard to the first edition are the following: - introduction of a product classification based on application requirements; - extension of the list of styles and dimensions; - use of an extended scope of stability class definitions; - extension of the lists of preferred values of ratings; - inclusion of test conditions and requirements for lead-free soldering, for periodic overload and for resistance to electrostatic discharge (ESD); - inclusion of a new set of severities for a shear test; - inclusion of definitions for a test board; - replacement of assessment level E and possible others by the sole assessment level EZ, meeting the requirements of a "zero defect" approach; - inclusion of an extended endurance test, a flammability test, a temperature rise test, vibration tests, an extended rapid change of temperature test, and a single pulse high-voltage overload test; - inclusion of requirements applicable to 0 ohm resistors (jumpers).