How to test RF coaxial connectors?

RF coaxial connector test methods are mainly two, one is the contact resistance test, the other is the insulation resistance test, as long as the use of these two methods, it can meet most of the inspection requirements of RF coaxial connectors. The following will give you a detailed knowledge of RF coaxial connector testing.1. Detect the contact resistance by observing the surface of the connector contacts under a microscope: it is found that despite the gold plating layer is very smooth, but you can still observe a raised part of 5-10 microns. You will see that the contact of a pair of inserted contacts is not the contact of the entire contact surface, but of a number of points dispersed on the contact surface. The actual contact surface must be smaller than the theoretical contact surface. Depending on the surface smoothness and contact pressure, the gap between them can be thousands of times larger. The actual contact surface can be divided into two parts; one is the real metal and the direct contact part between the metals. That is, the point of contact between the metals without transition resistance, also known as the contact point, is formed by contact pressure or thermal action that destroys the boundary film. This part accounts for about 5-10% of the actual contact area. The second is the parts that contact each other after contaminating the film through the contact interface.2. Insulation Resistance Test Insulation Resistance: It is the resistance value presented by applying a voltage to the insulating part of the connector and generating a leakage current on the surface or inside the insulating part. Insulation resistance (mΩ) = voltage applied to the insulator (V) / leakage current (μA). The insulation resistance test is used to determine whether the insulation performance of connectors under environmental stresses such as high temperature and humidity meets the circuit design requirements or whether the insulation resistance meets the provisions of the relevant technical conditions.

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