Connector knowledge The basic performance of connectors can be divided into three categories: mechanical, electrical, and environmental performance. Another important mechanical property is the mechanical life of the connector. Mechanical life is actually a durability index, in GB GB5095 called it mechanical operation. It is a plug-in and a pull-out as a cycle to the specified plug-in cycle after the connector can complete its connection function (such as contact resistance) as a basis for judging.
1. MECHANICAL PROPERTIES In terms of the connection function, the insertion force is an important mechanical property. Insertion and insertion force is divided into pull-out force (pull-out force, also known as separation force), the two requirements are different. The maximum insertion force and the minimum separation force are specified in the relevant standards, which indicates that the insertion force is small from the use point of view (thus having a low insertion force LIF and a structure having no insertion force ZIF) and the separation force is too small, It will affect the reliability of contact. The insertion force and mechanical life of the connector are related to the quality of the contact parts (sliding friction coefficient) of the contact structure (positive pressure level) and the dimensional accuracy of the contact arrangement (alignment).
2. Electrical performance The main electrical properties of the connector include contact resistance, insulation resistance and electrical strength.
① contact resistance High-quality electrical connectors should have a low and stable contact resistance. The contact resistance of the connector ranges from a few milliohms to tens of milliohms.
② insulation resistance measurement of electrical connectors and contacts between contacts and shell insulation performance indicators, the magnitude of several hundred megahertz to several thousand megohms range.
③ Dielectric strength or resistance to voltage, dielectric pressure, is to characterize the contact between the connector or contact between the shell and the ability to withstand the rated test voltage.
④ other electrical properties.
Electromagnetic interference leakage attenuation is to evaluate the connector's electromagnetic interference shielding effect, electromagnetic interference leakage attenuation is to evaluate the connector's electromagnetic interference shielding effect, generally in the 100MHz ~ 10GHz frequency range test.
On the RF coaxial connector, there are characteristic impedance, insertion loss, reflection coefficient, voltage standing wave ratio and other electrical indicators. As the development of digital technology, in order to connect and transmit high-speed digital pulse signal, there has been a new type of connector that is high-speed signal connector, corresponding to the electrical properties, in addition to the characteristic impedance, but also the emergence of some new electrical indicators , Such as crosstalk, transmission delay, delay and so on.