电子设备用固定电阻器 - 第 8 部分：分规范：固定表面贴装电阻器

[中文适用范围]： IEC 60115-8:2023 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）以及产品技术来描述。这些电阻器具有金属化端子，主要用于直接安装到电路板上。本文件的目的是指定优选的额定值和特性，并从 IEC 60115-1 中选择适当的质量评估程序、测试和测量方法，并给出此类电阻器的一般性能要求。该版本相对于前一版本包括以下重大技术变化： a) 采用了通用规范 IEC 60115-1:2020 的产品技术定义和产品分类级别； b) 3.1.5和4.2.2中增加了新型横向（RT）电阻器，以涵盖市场上常见的宽端子电阻器； c) 对5.2.2中推荐的测试板进行了修改，以适应市场对电阻器更高额定耗散的需求； d) 修改了测试板，使其在规定的测试中可以垂直设置而不是水平设置，以优化测试室内的温升稳定性、面积和间距； e) IEC 60115-1:2020, 8.3 的“周期脉冲高压过载测试”已添加到 5.3.8 中的默认测试方法中，但是，IEC 60115-1 的传统测试“周期脉冲过载测试” 1：2020年，历史产品仍维持8.4；和更多。更改列表请参阅前言。 [外文原描述]： IEC 60115-8:2023 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) and product technology. These resistors have metallized terminations and are primarily intended to be mounted directly onto a circuit board. The object of this document is to specify preferred ratings and characteristics and to select from IEC 60115-1, the appropriate quality assessment procedures, tests and measuring methods and to give general performance requirements for this type of resistor. This edition includes the following significant technical changes with respect to the previous edition: a) definitions of product technologies and product classification levels of the generic specification, IEC 60115-1:2020, have been adopted; b) new style of transverse (RT) resistors has been added in 3.1.5 and 4.2.2 to cover resistors with wide terminals, which have become common in market; c) recommended test boards in 5.2.2 have been revised to fit the demands from the market for higher rated dissipation in resistors; d) test boards have been revised so that they can be set vertically instead of horizontally during specified tests to optimize the temperature rise stability, area and spacing inside the test chamber; e) 'Periodic-pulse high-voltage overload test' of IEC 60115‑1:2020, 8.3 has been added to the default test method in 5.3.8, however, the legacy test 'periodic-pulse overload test' of IEC 60115‑1:2020, 8.4 is still maintained for historical products; and more. Please see the foreword for the list of changes.