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The basic performance of the connector Introduction

The basic performance of the performance of the connector, the connector can be divided into three categories: mechanical performance, environmental performance and electrical performance.

(1) The mechanical properties

Terms of connectivity, the insertion force is an important mechanical properties. Insertion force is divided into the insertion and extraction force (pullout force also known as a separation force), the requirements are different.

Another important mechanical properties are the mechanical life of the connector. Mechanical life is actually a durability index call it the national standard GB5095 mechanical operation. Once it is inserted and once pull out as a cycle, the connector after a predetermined mating cycles whether the normal completion of the connection features (such as contact resistance value) as the evaluation basis.

Connector insertion force structure and mechanical life contacts (positive pressure size), the quality of the coating of the contact area (sliding friction coefficient) of contacts arranged dimensional accuracy (alignment degrees).

(2) environmental performance

Common environmental performance, including temperature, humidity, salt spray resistance, resistance to vibration and impact resistance, etc..

① temperature. A maximum operating temperature of the connector to 200oC (except for a small number of special high-temperature connector), the lowest temperature of-65oC, Due to the work of the connector at the contact point, the current generates heat, causing the temperature rise, it is generally believed that the operating temperature should be equal to the ambient temperature and the junction temperature and the. In some specifications, specified connector rated operating current maximum allowable temperature rise.

The ② moisture. The intrusion of moisture will affect the the connector insulation properties, and corrosion of metal parts. Damp heat test conditions for the relative humidity in the range of 90% to 95% (depending on product specifications, up to 98%), the temperature of +40 ± 20oC test time at least 96 hours in accordance with product. Damp heat test is more stringent.

③ resistant to salt spray. The connector work environment containing moisture and salt, its metal structure, contacts a surface treatment layer may produce galvanic corrosion, affecting the physical and electrical performance of the connector. In order to evaluate the ability to withstand such an environment, the electrical connector provides for the salt spray test. It is the connector suspended in a temperature controlled test chamber, with a predetermined concentration of sodium chloride solution was sprayed with compressed air, to form a salt spray atmosphere, its exposure time is required by the product specifications, at least 48h. (Speed ​​& P Electronics Laboratory)

(4) resistance to vibration and shock. Vibration and shock resistance are important properties of the electrical connector, in a special environment, such as aviation and aerospace, rail and road transport is particularly important to test the mechanical structure of the electrical connector robustness and electrical contact reliability indicators . Are clearly defined in the test method. The impact test shall be provided that the peak acceleration, duration and impact pulse waveform as well as electrical discontinuity. (Speed ​​& P Electronics Laboratory)

⑤ other environmental performance. According to the use requirements, other environmental performance of the electrical connector as well as the tightness (air leakage, the pressure of the liquid), the liquid impregnation (resistant to the particular liquid vices capabilities), and low pressure, and so on.

(3) The electrical performance

The electrical performance of the connector contact resistance, insulation resistance and dielectric strength.

(1) contact resistance. The quality of the electrical connector should have a low and stable contact resistance. Connector contact resistance ranging from a few milliohms to tens of milliohms.

(2) Insulation resistance. The measure between the electrical connector of the connector and the contact member between the shell and the insulating performance indicators, and their number ranging in the order of hundreds of megohms to thousands of megohms.

③ electric strength. Also called dielectric strength voltage resistance, dielectric withstand voltage, is the ability of the characterization of the connector between the contact member or the contact member between the shell and withstand the rated test voltage.

④ other electrical performance. The leakage of electromagnetic interference attenuation is evaluate the connector of the electromagnetic interference shielding effect, the leakage of electromagnetic interference attenuation is the evaluation of the electromagnetic interference shielding effect of the connector, generally in the frequency range of 100MHz ~ 10GHz test.

     RF coaxial connectors, as well as the characteristic impedance, insertion loss, reflection coefficient and voltage standing wave ratio of electrical indicators. Due to the development of digital technology, in order to connect and transfer high-speed digital pulse signal, a new type of connector that high-speed signal connectors, electrical performance, in addition to the characteristic impedance, but also there has been some new electrical indicators crosstalk, propagation delay and time delay.