（1） Manufacturer's test connector
First of all, we need to know the appearance standard of a basic good connector. The connector is generally composed of terminal rubber shell and needle base. The inspection of connectors is generally divided into pre assembly and post assembly.
Inspection before assembly: lack of material, burr, shrinkage, deformation, color difference, dirt, hole plugging, indentation, uneven / deformation of barrier plate, warping of clamping point, subsidence / deviation or fracture, wrong pin identification / no pin identification, etc.
Inspection after assembly: check whether there is a gap between the copper / iron shell and the rubber shell, the iron / copper shell is deformed, the buckle is not pressed in place / biased, the rubber shell is crushed, the left and right hooks are not installed in place (the exposed dimensions of the hooks at both ends are inconsistent), press the hooks several times by hand to confirm whether the left and right hooks are normal and elastic.
The above are the troubleshooting factors of defective products when testing products by connector manufacturers.
（2） Personal detection connector
Some connectors look OK on the surface, but they are broken inside. The expert can directly get the quality of the connector by touching, smelling and seeing.
1. Touch. Feel whether the connector is carefully made by hand. If the surface is obviously rough and the service life is not guaranteed, there is a huge difference between itself and high-quality products in terms of safety.
2. Smell. Some manufacturers will add fragrance to cover up the taste of inferior materials, so the products with fragrance need to be considered more carefully.
3. Look. If you see that the connector and socket are seriously oxidized on the metal surface, which is basically close to gray color, these are quality problems, which will affect the welding quality. Generally, unused connectors will not be oxidized or damaged in appearance.
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