-Environmental Parameters-
Ambient temperature
The metal material and insulating material of the connector determine the working ambient temperature of the connector. High temperature will damage the edge material, causing the insulation resistance and withstand voltage performance to decrease; for metals, high temperature can make the contact pair lose elasticity, accelerate oxidation and cause coating deterioration. The usual ambient temperature is -55~100°C, which may be higher in special occasions.
Damp
Relative humidity greater than 80% is the main cause of electrical breakdown. Humid environment causes the absorption and diffusion of water vapor on the surface of the insulator, which is easy to reduce the insulation resistance to below MΩ level. Long-term exposure to high humidity environment will cause physical deformation, decomposition and escape of products, resulting in breathing effect and electrolysis and corrosion. and cracks. Especially for connectors outside the equipment, environmental conditions such as moisture, water infiltration and pollution are often considered. In this case, sealed connectors should be selected. For water-tight and dust-tight connectors, the enclosure protection level of GB4208 is generally used.
Temperature abrupt change
The humidity shock test is to simulate the actual use situation of using connector equipment to switch from a cold environment to a warm environment, or to simulate the rapid change of the ambient temperature of space vehicles and probes. Abrupt temperature changes may crack or delaminate the insulating material.
Atmospheric pressure
At high altitudes where the air is thin, the plastic emits gas to contaminate the contact pair, which increases the tendency of corona generation, reduces the voltage resistance, and causes the circuit to short-circuit. When the altitude reaches a certain value, the performance of the plastic deteriorates. Therefore, when using unsealed connectors at high altitudes, they must be derated.
Corrosive environment
According to the different corrosive environment of the connector, choose the connector with the corresponding metal, plastic and coating structure, such as the connector used in the salt spray environment, if there is no anti-corrosion metal surface, the performance will deteriorate rapidly. Connectors with silver-plated contact pairs should not be used in environments containing considerable concentrations of SO2. Mold is also a significant problem in hot flash areas. 5. Termination method Termination method refers to the connection method between the contact pair of the connector and the wire or cable. Reasonable selection of termination methods and correct use of termination technology are also an important aspect of using and selecting connectors.