Circular electrical connector some relevant knowledge points

  Circular electrical connectors have strong transmission functions, and their performance can be divided into electrical performance, mechanical performance and environmental performance. Among them, the electrical properties of circular electrical connectors are divided into electrical properties such as contact resistance, insulation resistance, and electrical strength.

  1. Electrical performance of circular electrical connectors;

  Contact Resistance A high-quality electrical connector should have low and stable contact resistance. The contact resistance of connectors varies from a few milliohms to tens of milliohms.

  Insulation resistance is a measure of the insulation performance between the contacts of an electrical connection device and between the contacts and the housing. Its magnitude ranges from a few hundred megohms to billions of ohms.

  Electrical strength, or withstand voltage and dielectric withstand voltage, refers to the ability of a circular electrical connector to withstand the rated test voltage between the contacts or between the contacts and the housing.

  Other electrical properties, electromagnetic interference leakage attenuation is to evaluate the electromagnetic interference shielding effect of circular electrical connectors, and is generally tested in the frequency range of 100MHz~10GHz.

  2. Advantages of circular electrical connectors:

  Connectors have the function of transmitting current and signals and are widely used in various fields. The advantage of electrical connectors is that they can simplify the assembly process of electronic products; electronic components equipped with circular electrical connectors are more convenient to replace and upgrade, and new ones can directly replace old ones, saving time and cost; they can also improve design flexibility . When electronic components fail, components equipped with electrical connectors can quickly replace the components and facilitate maintenance.

  3. Inspection requirements for circular electrical connectors:

  The performance, structure, appearance, etc. of circular electrical connectors should be inspected and tested after production is completed. Specifically in:

  1. Reliability test: Electrical connectors are important signal transmission tools, and the reliability of their connecting components directly determines the stability of the transmission performance. The reliability of circular electrical connectors is reflected in the contact surface and style. Generally speaking, surface contact is better than point contact, and pinhole type is better than leaf spring type.

  2. Impedance matching test: impedance matching of electrical connectors. General signal transmission has no special requirements for impedance. Only radio frequency signals have strict requirements for impedance matching of electrical connectors. Impedance mismatch will cause signal reflection and affect the signal transmission of the circular electrical connector, so it is very important to check the impedance matching of the circular electrical connector for RF signals.

  3. Structural size inspection: The structural size of the circular electrical connector should be shaped according to the use space and installation location of the product connection. The circular electrical connector on the single board should be careful not to contact other components. The structure, shape and size of circular electrical connectors have strict requirements during installation, including front installation and rear installation, as well as different fixing methods. Structural dimensional inspection of circular electrical connectors is to verify that installation requirements are met.

  4. Versatility and durability testing: The selection of electrical connectors should focus on versatility as much as possible. Circular electrical connectors are the most versatile among products in the same series, which can reduce risks and material types, and are conducive to cost control. Durability refers to whether the circular electrical connector's adaptability to the working environment is qualified and whether it can work normally in complex environments. It mainly tests the high temperature resistance, salt spray resistance, corrosion resistance and other properties of circular electrical connectors, which is one of the important inspection indicators.

  5. Shielding performance test: With the development of electronic technology, the shielding function of electrical connectors is getting stronger and stronger. Electrical connectors require a metal shell and a cable shield. The shield is connected to the metal shell to achieve a shielding effect. Or by injection molding, the plug part is wrapped with copper, and then the cable shield and copper are welded together to provide shielding. The shielding performance testing of electrical connectors is an indispensable part of all testing projects.