What is the environmental resistance of a connector?

I. What is the environmental resistance of connectors? Connectors are used in a variety of environments. Therefore, the requirements for environmental performance will be standardized accordingly. Environmental performance includes: temperature resistance, humidity resistance, salt spray resistance, vibration and shock resistance, other performance requirements. ① temperature connectors for the current higher operating temperature of 200 ℃ (except for a few high-temperature special connectors), the lower temperature of -65 ℃. As the connector works, the current at the point of contact to generate heat, 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 allowable higher temperature rise. ② Resistant to the intrusion of humidity moisture will affect the connection h insulation properties, and corrosion of metal parts. Constant humidity and heat test conditions for the relative humidity of 90% to 95% (according to product specifications, up to 98%), the temperature +40 ± 20 ℃, the test time according to the product, 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 requirements of the use of 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.

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