Environmental performance

Environmental performance common environmental performance includes temperature resistance, humidity resistance, salt spray resistance, vibration and impact resistance.

① At present, the maximum working temperature of the connector is 200 ℃ (except for a few high-temperature special connectors), and the minimum temperature is -65 ℃. When the connector works, the current generates heat at the contact point, resulting in temperature rise. Therefore, it is generally considered that the working temperature should be equal to the sum of ambient temperature and contact temperature rise. In some specifications, the maximum allowable rise of the connector under the rated working current is clearly specified. ② The invasion of moisture resistance will affect the insulation performance of connection h and rust the metal parts. The constant damp heat test condition is 90% - 95% relative humidity (up to 98% according to the product specification), temperature +40 ± 20 ℃, and the test time is at least 96 hours according to the product specification. The alternating damp heat test is more rigorous.

③ When the salt spray resistant connector works in the environment containing moisture and salt, the surface treatment layer of its metal structure and contact may produce electrochemical corrosion, affecting the physical and electrical properties of the connector. In order to evaluate the ability of electrical connectors to withstand this environment, salt spray test is specified. It is to hang the connector in a temperature controlled test box and spray the specified concentration of sodium chloride solution with compressed air to form a salt fog atmosphere. The exposure time is specified by the product specification, which is at least 48 hours.

④ Vibration and shock resistance to vibration and shock is an important performance of electrical connectors, which is particularly important in special application environments such as aviation and aerospace, railway and highway transportation. It is an important index to test the robustness of mechanical structure and electrical contact reliability of electrical connectors. There are clear provisions in the relevant test methods. The peak acceleration, duration and impulse waveform as well as the time of interruption of electrical continuity shall be specified in the impact test.

⑤ Other environmental properties according to the use requirements, other environmental properties of the electrical connector include tightness (air leakage, liquid pressure), liquid impregnation (anti habitation ability of specific liquid), low pressure, etc.