Pogopin influencing factors

　　Mainly affected by factors such as contact material, positive pressure, surface condition, operating voltage and current.

　　1) Contact material

　　The electrical connector technical conditions stipulate different contact resistance assessment indicators for mating contacts of the same specification made of different materials. For example, GJB101-86, the general specification for small circular quick-release environmental resistant electrical connectors, provides that the contact resistance of mating contacts with a diameter of 1mm, copper alloy ≤5mΩ, iron alloy ≤15mΩ.

　　2) Positive pressure

　　The positive pressure of the contact refers to the force generated by the surfaces in contact with each other and perpendicular to the contact surface. As the positive pressure increases, the number and area of the contact micro-points gradually increase, and at the same time the contact micro-points transition from elastic deformation to plastic deformation. As the concentration resistance gradually decreases, the contact resistance decreases. The positive contact pressure mainly depends on the geometry and material properties of the contact.

　　3) Surface condition

　　The surface of the contact piece is a loose surface film formed by the mechanical adhesion and deposition of dust, rosin, and oil on the surface of the contact. This surface film is easily embedded in the microscopic pits of the contact surface due to the particulate matter, making the contact The area shrinks, the contact resistance increases, and it is extremely unstable. The second is that the pollution film formed by physical adsorption and chemical adsorption is mainly chemical adsorption to the metal surface, which is produced by the migration of electrons after physical adsorption. Therefore, for some products with high reliability requirements, such as electrical connectors for aerospace, there must be clean assembly and production environmental conditions, complete cleaning processes and necessary structural sealing measures, and the user must have good storage and operating environmental conditions. .

　　4) Operating voltage

　　When the applied voltage reaches a certain threshold, the film layer of the contact member will be broken down, and the contact resistance will drop rapidly. However, the thermal effect accelerates the chemical reaction in the area near the film, which has a certain repair effect on the film. Therefore, the resistance value is nonlinear. In the vicinity of the threshold voltage, small fluctuations in the voltage drop will cause the current to change within a range of twenty times or several tens of times. The contact resistance changes greatly. If you don't understand this kind of non-linearity, errors will occur when you test and use the contacts.

　　5) Current

　　When the current exceeds a certain value, the Joule heat () generated at the tiny points on the interface of the contact piece will soften or melt the metal, which will affect the concentration resistance and reduce the contact resistance.

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