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EMI leakage attenuation is the evaluation of the connector's electromagnetic interference shielding effect, EMI leakage attenuation is the evaluation of the connector's electromagnetic interference shielding effect, generally in the 100MHz ~ 10GHz frequency range test. For RF coaxial connectors, there are characteristic impedance, insertion loss, reflection coefficient, voltage standing wave ratio (VSWR) and other electrical indicators. Due to the development of digital technology, in order to connect and transmit high-speed digital pulse signals, a new type of connector that is a high-speed signal connector, accordingly, in terms of electrical performance, in addition to the characteristic impedance, there are also some new electrical indicators, such as crosstalk (crosstalk), transmission delay (delay), time lag (skew) and so on.
How connectors work:You may not know more about connectors. The so-called connector is two or several containers that are interconnected below the liquid level. Connectors holding the same liquid, equal pressure on the liquid level, the height of the liquid level is equal. (1) The connector contains the same liquid, but the pressure on the liquid level is not equal, then the pressure difference at the liquid level is equal to the pressure difference generated by the difference in liquid level between the two containers in the connector. (2) connector liquid surface pressure is equal, but the two sides of the different liquids are not mixed, since the interface from the height of the two liquid surfaces and the density of the liquid is inversely proportional.
The basic performance of the connector:Connector knowledgeThe basic performance of the connector can be divided into three main categories: that is, mechanical properties, electrical properties and environmental performance. Another important mechanical properties is the mechanical life of the connector. Mechanical life is actually a durability (durability) indicators, in the national standard GB5095 called it mechanical operation. It is an insertion and a pull-out for a cycle, in order to specify the insertion and pull-out cycle after the connector can normally complete its connection function (such as contact resistance value) as the basis for judgment. Connector: 1. Mechanical properties of the connection function, insertion and extraction force is an important mechanical properties. Insertion force is divided into insertion force and pull-out force (pull-out force is also known as separation force), the two requirements are different. In the relevant standards have the maximum insertion force and minimum separation force provisions, which indicates that, from the point of view of the use, the insertion force should be small (so that there is a low insertion force LIF and no insertion force ZIF structure), while the separation force is too small, it will affect the reliability of the contact. The insertion and extraction force and the mechanical life of the connector are related to the structure of the contacts (size of the positive pressure) the quality of the plating on the contact area the coefficient of sliding friction as well as the dimensional accuracy of the arrangement of the contacts (degree of alignment).
Electrical properties of the main electrical properties of the connector including contact resistance, insulation resistance and electrical strength. ① contact resistance of high-quality electrical connectors should have a low and stable contact resistance. Connector contact resistance from a few milliohms to tens of milliohms. ② insulation resistance measure of electrical connector contact and contact between the shell and the insulation between the indicators, the order of magnitude of hundreds of megohms to thousands of megohms. ③ electric strength or voltage resistance, dielectric withstand voltage, is characterized by the connector between the contact parts or between the contact parts and the shell to withstand the rated test voltage. Other electrical properties.
3. Environmental performance of common environmental performance, including temperature resistance, moisture resistance, salt spray resistance, vibration and shock. ① temperature currently the connector's maximum operating temperature of 200 ℃ (except for a few high-temperature special connectors), the minimum temperature of -65 ℃. As the connector works, the current generates heat at the point of contact, resulting in temperature rise, so it is generally believed that the operating temperature should be equal to the ambient temperature and the temperature rise of the contact point and the sum. In some specifications, it is specified that the connector in the rated operating current under the maximum allowable temperature rise. ② Resistant to the intrusion of moisture moisture will affect the connection h insulation properties, and corrosion of metal parts. Constant damp heat test conditions for the relative humidity of 90% to 95% (according to product specifications, up to 98%), temperature +40 ± 20 ℃, the test time according to product specifications, at least 96 hours. Alternating humidity and heat test is more stringent. ③ salt spray connector in the environment containing moisture and salt work, its metal structure, contact surface treatment layer may produce galvanic corrosion, affecting the physical and electrical properties of the connector. In order to evaluate the ability of electrical connectors to withstand this environment, the salt spray test is prescribed. It is the connector suspended in a temperature-controlled test chamber, with a specified concentration of sodium chloride solution with compressed air spray, the formation of salt spray atmosphere, the exposure time specified by the product specification, at least 48 hours. ④ vibration and shock resistance to vibration and shock is an important performance of the electrical connector, in special application environments such as aviation and aerospace, railroads and road transportation is particularly important, it is to test the mechanical structure of the electrical connector ruggedness and reliability of the electrical contact of the important indicators. There are clear provisions in the relevant test methods. Impact test should be specified in the peak acceleration, duration and impact pulse waveform, as well as the time of interruption of electrical continuity. ⑤ other environmental performance according to the use of requirements, the other environmental performance of the electrical connector sealing (air leakage, liquid pressure), liquid impregnation (on the specific liquid resistance to abusive chemical ability), low air pressure and so on.-4, on the 3M electronic products network platform related to the introduction and sales of products brief: 3M electronic products network - a professional agent / production / sales of a variety of {connectors | wiring harness | wire and cable products }; if you have a related [connectors | wiring harness | wire and cable products] purchasing / sourcing needs or would like to buy / to understand which connectors | wiring harness | wire and cable products we can provide solutions, please contact the Division I business personnel below; If you have related [connector | wire harness | wire and cable production] sales / resources and promotion needs, please click on the ¡¡ Business Cooperation ← ¡" to discuss with a person!