Connector according to its product function and the use of the environment, the specification is divided into four parts.
1 electrical specifications
2 mechanical specifications
3 environmental standards
4 the requirements of environmental protection
First, the electrical specification requirements
Electrical characteristics are the main characteristics of connector connection function. Determination of electric characteristics of the connector, to ensure that the connector meets the connection function. The electrical characteristics of connector:
The 1 contact impedance (Contact Resistance)
Objective: to maintain the connector impedance in the period of use of contact, in order to reduce the signal and energy transmission in the process of loss or attenuation.
Test method: EIA-364-23 (EIA-364-06) or MIL-STD-1344A, 3004.1.
Test points: A. test current / voltage 100mA@20mV, the connector is test (connect system) without load.
B. test current for low current to avoid contact impedance by terminal (conductor) thermoelectric effect.
C. the test voltage to low voltage in order to avoid terminal (conductor) interface between the insulating film breakdown and melting.
Specification: General requirements 50m omega (initial); 100m (final, namely in the life test or the environment after test).
The definition of contact impedance of this parameter is to reduce the signal and energy transmission in the process of loss or attenuation, like water like current. Resistance is small, the energy loss and the attenuation of the less.
Contact connector is concerned, the influence factors of the impedance is positive force (for elastic contact structure), contact with the environment, such as terminal (conductor) of the surface roughness, surface treatment (such as electroplating metal properties and compactness), terminal and terminal (or other conductor) is a way of combining (or welding riveting or elasticity contact etc.).
From the electrical theory, the contact impedance of C impedance point green circle at the point of contact for guests to use; in angle, connectors provide point A to point B conduction (connection), so the impedance guests want should impedance contains from point A to point B all the conductor itself and of the contact resistance (including welding, riveting and other contact).