Where is the UL certification of Shenzhen equipment handled
Where is the UL certification of Shenzhen equipment handled
How is Canada's IC certification handled
How is Canada's IC certification handled
The data of this system is only used for customers to query and check the authenticity of certificates and reports, and is not used for other purposes.
Once the Underwriters u5f6b9 lab has all the data you can provide, it can decide which department will test the product. UL Engineering Department: "develop test plan", "provide estimated test cost", "approximate test end time", "send application form". At this point, if you have any time limit, you should inform underwriter laboratories so that it can consider arranging tests. Once you return the application and provide the corresponding advance payment, and UL engineers receive the corresponding test samples, UL engineers can start testing your products.
During the testing of products in UL laboratory, customers will receive the tracking inspection agreement. The agreement is marked with the name of the manufacturer in duplicate. The agreement shall be signed by the responsible person or authorized person of the manufacturer and sent back to UL. The agreement must be signed by all parties to take effect.
After the product test is completed, your project engineer will inform you whether the product meets UL requirements. For products meeting UL requirements, the project engineer will prepare a formal report based on the test data. The test data will also be used to track the service and serve as the basis for the tracking service specification. Tracking service specification is a document that describes in detail the structure of UL test products to meet UL requirements. UL Site Representatives will use this document as a guide to conduct regular UL product inspections at the factory.
The approval mark of class R products can be identified from the "product mark" specified in the "approved parts catalogue". Generally, it includes the identification symbol, type number or approved product model of the factory. The approval mark of class R products does not necessarily appear on the products.
If, for some reason, your product does not meet UL's requirements, UL will notify you of the items that do not meet the requirements. If necessary, you can contact the engineer to retest your product. If you have questions about the test results, your understanding of a requirement, or UL's decision, UL's appeal procedure allows you to let UL's management listen to you without worrying about affecting your relationship with UL.
Although UL safety certification is not mandatory, in fact, if the product does not have UL safety certification mark, it is difficult to find the market. When American consumers buy Mechanical and electrical products, they always first look at whether the products bear the UL Mark. Retailers and distributors also want their products to bear the certification mark recognized by the public. It can be seen that the influence of UL certification mark is not small. UL certification is a powerful mark to ensure that products sell well.
The power supply ground is mainly used for the current path of the power supply circuit. Generally speaking, the current flowing through the power supply ground is relatively large, and the signal ground is mainly the return path of the communication signal between two chips or modules. In general, the current flowing through the signal ground is very small. In fact, they are all GND. The reason why they are separated is to let everyone understand that PCB layout is an important part. It is necessary to have a clear understanding of the return path of power supply and signal, and then consider how to avoid sharing the return path of power supply and signal when arranging the board.
Product name or description. List the specific name of the product to be applied for, and make a brief description, including the materials used by the product, etc. The intended use of the product. Where is the product used, indoors or outdoors, on water or underwater, etc.
In case of sharing, due to the large current on the power supply ground, the voltage difference on the signal ground may be caused (it can be explained that the conductor has impedance and only has a small resistance value, but if the current flowing is large, the potential difference on the conductor will also be generated, which is also called common impedance interference), so that the actual potential of the signal ground is higher than 0V. If the signal is high, the potential of the signal ground is large, It may be misjudged as low level.
The whole American market pays great attention to product safety; When consumers and buyers buy products, they will choose products with UL certification marks.
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