1. Mechanical parameters
Insertion force is an important mechanical property for measuring connector performance. The insertion force is divided into insertion force and extraction force, and the requirements of the two are different. From the use point of view, the smaller the insertion force, the better, but the extraction force should not be too small, otherwise it will affect the reliability of the contact.
Mechanical life is actually a kind of durability index. It is based on one insertion and one extraction as a cycle, and judges whether the connector can normally complete its connection function (such as contact resistance value) after the specified insertion and removal cycle.
It is related to the structure of the contact (positive pressure), the quality of the coating at the contact site (coefficient of sliding friction), and the accuracy (alignment) of the size of the contact arrangement.
2. Electrical parameters
High-quality electrical connectors should have low and stable contact resistance. The contact resistance of a connector ranges from a few milliohms to tens of milliohms.
Depending on the material and cross-sectional area of the terminal, the larger the cross section, the smaller the resistance per unit length, and the less heat generated by the current flow, the smaller the temperature rise of the terminal, and the larger the current can be conducted.
The index for measuring the insulation performance between the contacts of the mil spec electrical connectors and between the contacts and the housing, the order of magnitude is from several hundred megohms to several gigaohms.
Also called withstand voltage, dielectric withstand voltage, is the ability to withstand the rated test voltage between the contacts of the connector or between the contact and the housing.
Other electrical parameters
Electromagnetic interference leakage attenuation is to evaluate the electromagnetic interference shielding effect of the connector, and it is generally tested in the frequency range of 100MHZ to 10GHZ.
For RF coaxial connectors, there are also electrical indicators such as characteristic impedance, insertion loss, reflection coefficient, and voltage standing wave ratio.
3. Environmental parameters
At present, the maximum working temperature of standard power connectors is 200 ℃, and the minimum temperature is -65 ℃. ——Temperature resistance test, temperature cycle test
Resistance to moisture and moisture
The intrusion of moisture will affect the insulation performance of the connector and rust metal parts. ——Constant Damp Heat Test, Alternate Damp Heat Test
Resistant to salt spray
The connector works in an environment containing moisture and salt. The metal structure and contact surface treatment layer may cause galvanic corrosion, which affects the physical and electrical properties of the connector. ——Salt spray test, corrosive gas test
Resistant to vibration and shock
Vibration resistance and shock resistance are important properties of micro electrical connectors. They are particularly important in special application environments such as aerospace and railways. It is an important indicator of the robustness and electrical contact reliability of the mechanical structure of connectors. ——Vibration test, physical shock test
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