Industry Knowledge: The Basic Properties Of Connectors - Connectors, Electronic, Electrical -

The basic properties of the connector can be classified into three categories: the

mechanical properties, Electric Performance and environmental performance.

(1) mechanical properties The connectivity, the power plug is an important mechanical properties. Plug power into insertion and extraction force (also known as separation of forces pull force), the two requirements are different.

Another important mechanical properties is the mechanical life of the connector. Mechanical life is actually a durability index, the national standard GB5095 Chinese call it machinery. It is based on an insertion and a pull out for a Cycle To the provisions of the plug connector can cycle normally after the completion of its connectivity (such as contacts Resistance Value) basis as the judge.

Plug power connector and mechanical life and the structure of contact (positive pressure on the size), access to parts of the coating quality (sliding friction coefficient) and the dimensional accuracy of contact arrangement (aligned degrees) about.

(2) electrical properties Connector electrical performance, including the main contact resistance, insulation resistance and electric strength.

contact resistance. High-quality electrical connectors should have a low and stable contact resistance. Connector contact resistance from a few cents to tens of cents Euro Euro range.

insulation resistance. Measure the electrical connector Connector And contact between the insulation and between the index case, its magnitude is several hundred to several thousand megohms megohms range.

electric strength. Electric strength, also known as anti-voltage, medium voltage, is characterized by the connector contacts or contacts with the shell between the tolerance between the rated capacity of the test voltage.

other electrical performance. EMI leakage attenuation to evaluate the connector EMI shielding, EMI leakage attenuation to evaluate the connector EMI shielding effectiveness, generally in the frequency range 100MHz ~ 10GHz Test .

In terms of RF coaxial connectors, as well as characteristic impedance, insertion loss, reflection coefficient and voltage standing wave ratio of electrical indicators. As digital technology, to connect and transmit high-speed digital pulse signal, there have been a new type of connector that is high-speed signal connectors, accordingly, the electrical performance, apart from the characteristic impedance, but also the emergence of new electrical indicators such as crosstalk, propagation delay and delay and so on.

(3) environmental performance Common environmental performance, including temperature, humidity, salt spray resistance, resistance to vibration and shock resistance.

temperature. The maximum current connector operating temperature 200C (except for a small number of high-temperature special connector) and the minimum temperature of -65C. As the connectors work, the current point in contact with heat, resulting in temperature rise, so generally believed that the environment temperature should be equal to the sum of temperature and junction temperature. In some specifications, the connector specified in the rated current, the maximum allowed temperature rise.

moisture. The intrusion of moisture will affect the connector insulation, and corrosion of metal parts. Damp heat, steady conditions for relative humidity of 90% to 95% (based on product specifications, up to 98%), the temperature is +4020C, test time as a product that at least for the 96h. Damp heat test even more stringent.

resistant to salt spray. Connectors contain moisture and salt environments, its metal structure, contacts Surface Treatment Layer may produce galvanic corrosion and affect the physical and electrical connector performance. To evaluate electrical connectors withstand such an environment the ability to provide a salt spray test. It is the connector Suspension Temperature controlled Chamber , The concentration with the provisions of Sodium chloride Solution with compressed air exhaust, the formation of salt air, the exposure time from the product specification, at least 48h.

by:gaga

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