Introduce you to the basic performance of the harness connector

The basic performance of harness connectors can be divided into three categories: mechanical performance, electrical performance and environmental performance. Another important mechanical property is the mechanical life of the harness connector. Mechanical life is actually an index of durability, which is called mechanical operation in the national standard gb5095. It takes one insertion and one pull-out as a cycle, and takes whether the connector can normally complete its connection function (such as contact resistance value) after the specified plug-in cycle as the evaluation basis. There are also various types of products in the market of harness connectors. Rectangular connector, rectangular plug and socket are made by installing a different number of contact pairs in a rectangular plastic shell with good insulation performance

1. Mechanical performance as far as the connection function is concerned, the plugging force is an important mechanical performance. The insertion force is divided into insertion force and pull-out force (pull-out force is also called separation force), and their requirements are different. There are provisions on large insertion force and small separation force in relevant standards, which shows that from the perspective of use, the insertion force is small (thus the structure with low insertion force LIF and no insertion force ZIF), and if the separation force is too small, it will affect the contact. The plugging force and mechanical life of the connector are related to the contact structure (positive pressure), the coating quality of the contact part (sliding friction coefficient) and the dimensional accuracy (alignment) of the contact arrangement

2. Electrical properties the main electrical properties of the connector include contact resistance, insulation resistance and electrical strength

① the electrical connector with contact resistance shall have low and stable contact resistance. The contact resistance of the connector varies from a few milliohms to tens of milliohms

② insulation resistance is an index to measure the insulation performance between contacts of electrical connectors and between contacts and shell, and its order of magnitude ranges from hundreds of megaohms to hundreds of gigaohms

③ electrical strength, or voltage resistance and dielectric withstand voltage, is the ability to withstand the rated test voltage between connector contacts or between contacts and shell

④ other electrical properties. Electromagnetic interference leakage attenuation is to evaluate the electromagnetic interference shielding effect of the connector. Electromagnetic interference leakage attenuation is to evaluate the electromagnetic interference shielding effect of the connector, which is generally tested in the frequency range of 100MHz ~ 10GHz. For RF coaxial connectors, there are also electrical indicators such as characteristic impedance, insertion loss, reflection coefficient, voltage standing wave ratio (VSWR). Due to the development of digital technology, in order to connect and transmit high-speed digital pulse signals, a new type of connector, high-speed signal connector, has emerged. Accordingly, in terms of electrical performance, in addition to the characteristic impedance, there are also some new electrical indicators, such as crosstalk, transmission delay, skew and so on