1.1 这些测试方法包括用于测量静电连接电阻的设备和技术，如电线终端或拼接、摩擦连接器、焊接接头和缠绕电线连接。 1.2 描述了在两种不同电负荷水平下的测量。这些级别是:( 1. )干电路( 2. )和额定电流。在特定情况下，可能需要一个或两个载荷水平。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任熟悉所有危险，包括制造商提供的本产品/材料的适当安全数据表（SDS）中确定的危险，建立适当的安全、健康和环境实践，并在使用前确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 如术语所述 B542 ，接触电阻由收缩电阻和薄膜电阻组成。当存在时，后者的值通常更大，并主导接触电阻。对于给定的接触点，当膜电阻为零或可忽略不计时，该点的接触电阻几乎与收缩电阻相同，因此，作为一个实际问题，具有一个最小值，表示干净的金属对金属接触点。由于实际接触表面呈现不同程度的粗糙度，实际接触必然由许多电平行的接触点组成。在实际情况下，清洁的金属对金属接触点将承载大部分电流，总接触电阻主要取决于存在的金属接触点的大小和数量（参见 注1 ). 此外，当真实接触面积显著小于表观接触面积时，通常会获得可接受的低接触电阻值。 这是在相对较大的表观接触面积上分布大量小接触点的结果。 注1: 此处使用的术语金属接触也包括所谓的准金属接触点。后一种情况在中进行了讨论 电气触点 作者:Holm。 3. 5.2 电气连接的实际评估和比较在很大程度上取决于其接触电阻特性。一方面，接触电阻的绝对值在很大程度上取决于承载接触表观区域内金属导电点的大小和分布。另一方面，初始电阻与老化后电阻的比较表明系统在保持初始接触面积方面的稳定性。在评估接触系统时，应考虑这两个特征。用于评估接触电阻和稳定性的标准不属于这些测试方法的一部分，因为它们取决于具体应用，因此不会定量说明。 然而，接触电阻的估计 3. 由于良好的金属接触，可以针对给定的物理情况进行测量，并将其与实际测量值进行比较，以确定系统在建立稳定金属接触方面的有效性。在模拟寿命试验之前、期间和之后通过这些方法测量的电阻用作确定装置内触点稳定性的手段。

1.1 These test methods cover equipment and techniques for measuring the resistance of static electrical connections such as wire terminations or splices, friction connectors, soldered joints, and wrapped-wire connections. 1.2 Measurements under two distinct levels of electrical loading are described. These levels are: ( 1 ) dry circuit, ( 2 ) and rated current. One or both of these levels of loading may be required in specific cases. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 As stated in Terminology B542 , contact resistance is comprised of a constriction resistance and a film resistance. When present, the latter of these is usually much greater in value and dominates the contact resistance. For a given contact spot, when the film resistance is zero or negligible the contact resistance for that spot is nearly the same as the constriction resistance and therefore, as a practical matter, has a minimum value which represents a clean metal-to-metal contact spot. As real contact surfaces exhibit varying degrees of roughness, real contacts are necessarily composed of many contact spots which are electrically parallel. In practical cases the clean metal-to-metal contact spots will carry most of the current and the total contact resistance is primarily dependent on the size and number of metallic contact spots present (see Note 1 ). In addition, acceptably low values of contact resistance are often obtained with true areas of contact being significantly less than the apparent contact area. This is the result of having a large number of small contact spots spread out over a relatively large apparent contact area. Note 1: The term metallic contact as used here is intended to include the so called quasi-metallic contact spots as well. The latter case was discussed in Electric Contacts by Holm. 3 5.2 The practical evaluation and comparison of electrical connections depend in large part on their contact resistance characteristics. On the one hand, the absolute value of contact resistance is greatly dependent on the size and distribution of the metallic conducting spots within the apparent area of load-bearing contact. On the other hand, a comparison of the initial resistance to the resistance after aging indicates how stable the system is in maintaining the initial contact area. Both of these characteristics should be considered when evaluating contact systems. The criteria employed in evaluating contact resistance and stability are not a part of these test methods as they depend on specific applications and therefore, will not be quantitatively stated. However, an estimate of contact resistance 3 resulting from good metallic contact can be made for a given physical situation and used as a comparison to actual measurements to determine how effective the system is in establishing stable metallic contact. Resistances measured by these methods before, during and after simulated life tests are used as a means of determining the stability of contacts within a device.