How Test Probes and Probe Sockets Work!

　　1. Needle part

　　Needles are mainly used for connections and can be used with various types of needles. And try to produce as little contact resistance as possible between the test probe and the test point to ensure the authenticity of the test results. The material of the needle is mainly steel and beryllium copper, which are hardened separately, and brass can also be used if the needle is very blunt.

　　2. Spring part

　　The spring is an efficient component that ensures the necessary contact force even after hundreds of thousands of revolutions (test cycles). The spring force ratings specified in the catalog can be achieved at the recommended operating travel, but will vary slightly due to factors such as construction, manufacturing tolerances and operating conditions.

　　3. Needle cover part

　　The needle cover supports the needle and spring. The measurement signal is transmitted to the probe sleeve. To optimize performance, a thinner organic protective layer can be applied in addition to the gold plating of the sleeve. The probe needle cover is used to facilitate the replacement of test probes when maintaining the test fixture. Fast replacement without wiring work. For this purpose, there are crimp positions on the sides. During this time, it is important to note that the crimp point only functions optimally when the casing is inserted into the drilled hole. That is, the probe must be inserted after the socket is inserted into the probe card.

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