M12 industrial connector is an electronic engineering and technical personnel often contact with a component, our daily life is also closely related with the connector, car connector, computer connector, home appliances connector, etc。, no connector connection, there is no today Convenient and comfortable life。 What is the performance of the connector?
中财彩票注册1, the mechanical properties of the connection function, the insertion force is an important mechanical properties。 Insertion force is divided into insertion force and pull out force, the two requirements are different。 In the relevant standards have the maximum insertion force and the minimum separation force, which indicates that the insertion force is small, and the separation force is too small, it will affect the reliability of contact。
Another important mechanical property is the mechanical life of the connector. Mechanical life is actually a durability indicator, in the national standard GB5095 it is called mechanical operation. It is a single insert and a pull out as a cycle to the specified plug in the loop after the connector can normally complete its connection function as a basis for judging.
The insertion force and mechanical life of the connector are related to the quality of the contact area of the contact structure and the dimensional accuracy of the contact arrangement.
2, electrical performance The main electrical performance of the connector, including contact resistance, insulation resistance and electrical strength。
① contact resistance High quality electrical connector should have a low and stable contact resistance. The contact resistance of the connector ranges from a few milliohms to several tens of milliohms.
(2) Insulation resistance measures the insulation performance between the electrical connector contacts and between the contacts and the enclosure, which is of the order of several hundred megohms to several gigahertz.
③ Dielectric strength or resistance to voltage, dielectric pressure, is to characterize the connector between the contacts or between the contact with the shell to withstand the rated test voltage capacity.
④ other electrical performance。
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, generally in the 100MHz ~ 10GHz frequency range test。
For RF coaxial connectors, there are characteristic impedance, insertion loss, reflection coefficient, voltage standing wave ratio and other electrical indicators。 As a result of the development of digital technology, in order to connect and transmit high-speed digital pulse signal, there is a new type of connector that is high-speed signal connector, accordingly, in terms of electrical performance, in addition to the characteristic impedance, there have been some new electrical indicators , Such as string delay。
3, environmental performance Common environmental performance, including temperature, humidity, vibration and shock.
① temperature The current connector of the maximum operating temperature of 200 ℃, the minimum temperature of -65 ℃. As the connector works, the current at the contact point to generate heat, resulting in temperature rise, it is generally believed that the operating temperature should be equal to the ambient temperature and contact temperature rise and. In some specifications, the maximum permissible temperature rise of the connector at rated operating current is specified.
② moisture resistant moisture intrusion will affect the connection h insulation properties, and corrosion of metal parts. Constant humidity test conditions for the relative humidity of 90% to 95%, temperature +40 ± 20 ℃, the test time by product, at least 96 hours. Alternating hot and humid test is more stringent.
③ salt spray connector in the environment containing moisture and salt work, the metal structure, the contact surface treatment layer may produce electrochemical corrosion, affecting the physical and electrical properties of the connector. In order to evaluate the ability of the electrical connector to withstand this environment, a salt spray test was specified. It is the suspension of the connector in the temperature controlled chamber, the formation of salt mist atmosphere, the exposure time by the product specification, at least 48 hours.
④ vibration and shock resistance to vibration and shock is an important performance of electrical connectors, it is to test the mechanical structure of electrical connectors robust and electrical contact reliability of the important indicators。 In the relevant test methods are clearly defined。 The peak acceleration should be specified in the impact test and the time for electrical continuity interruption。
⑤ other environmental performance According to the use of requirements, other environmental connector performance there are sealing, low pressure and so on.