Learn how to check the connection cables of appliances that apply USB

USB cable is a common tool for charging batteries in people's daily life, whether it is a finger reading wall chart in infant enlightenment education, or an electric grinder used to break garlic paste in restaurant kitchen, USB cable is needed, so how to ensure the safety of this electrical product? How do I check the USB cable? 1. Appearance inspection: USB cable plug shell: the colloid solution shall be free of bubbles, shrinkage, burrs, scratches, peeling and stains, and the buckle structure shall be well connected with the shell, the joint seam shall be ≤ 0.5mm, and there shall be no loosening, cracking, etc. Metal part of USB cable plug: the colloid solution shall be free of shrinkage, burrs and scratches, and the buckle structure shall be well connected with the shell, with the joint ≤ 0.5mm, and shall be free of loosening, cracking, etc. USB cable appearance: the cable is free of stains, blisters, shrinkage, scratches, deformation, angle loss, exposed cable core and other conditions. USB type description: whether the paper sticker and plug on the connecting line are the same as the test object. Encapsulation: The USB connecting cable harness is bundled and packed in a PE bag. The package is undamaged, which can protect the USB connecting cable during transportation and storage. A warning message is pasted on the outside. The printed content of the color box is consistent with the customer information. II. On-site test: ① Box dropping test of connecting line: refer to ISTA1A specification. The USB cable is not likely to cause fatal defects or relatively serious defects after testing. ② Precise measurement of USB cable specification, power plug length and net weight: according to USB cable specification and model description or reference version. If the specification of the USB cable required by the customer is not met, select the +/-3% dimensional tolerance. ③ USB connection line bar code identification inspection: the bar code can be scanned, and the scanning result is correct. ④ USB cable assembly test: According to the instructions, the cable can be assembled smoothly, and there is no product quality problem after assembly. ⑤ Multi-function check of USB cable (including the functions that must be put together): It must have all nominal functions, such as installation and adjustment, power switch, setting, display, specific application, etc. ⑥ Wiring coating adhesion test: all package printing, foil printing and ultraviolet coating shall be subject to color fastness test with 3m adhesive tape, and the total adhesion rate shall not exceed 10%. ⑦ Wiring operation test: under the rated current, test the test sample with full load for 4 hours (or select the full load time according to the instructions). After the test, high voltage test, action test and grounding device test shall be carried out on the test piece. ⑧ Drop test (applicable to portable/movable/portable articles) Drop the test object on the wood floor for 3 times at will. The height-width ratio of the test is: articles on the desktop (not more than 5KG); movable articles: 750mm portable goods, plug and play connection style; Portable: After the 1000mm test, there is no safety factor problem, and the high-voltage test must be carried out, and the grounding device test must be passed smoothly. Major issues, if found during or after the test, shall be recorded. ⑨ Inspection of internal quality and key parts: check the details of internal structure and key parts according to the architecture drawing or details of key parts. ⑩ Friction test indicating the rated value and pasting test of package printing mark: wipe the mark with tap water for 15 seconds, and then wipe it with vehicle gasoline for 15 seconds. ⑪ Needle withdrawal test (applicable to the United States): The needle, disconnected and grounded device can withstand 20 pounds of force for 2 minutes, and the needle shall not be withdrawn or displaced by more than 2 mm. Durability test of ⑫ plug (for USA): After 10 times of insertion and reinsertion, the connecting plug can be completely inserted into the machine equipment. Apply a force of 3 pounds in a vertical direction to the contact surface of the connecting wire and do not deflect more than 2 mm from the pin force plug within 60 seconds. Maximum and minimum pull-out check of the ⑬ (applicable to the sales market in the European region): the specification range of the single needle pulled out is greater than 2 N and less than 27 N. Diameter inspection of power plug connecting wire of ⑭: 3.8 mm.

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