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Anonymous users2024-02-11The first one is lead-free.
The second is UL
UL is the Underwriter Laboratories IncShorthand for ). The UL796 standard is a test method standard for the combustion performance of materials formulated by the Underwriters Laboratory of the United States, and the UL rating of the circuit board factory is commonly known as the "flame retardant grade".
People usually ask what grades are there for UL? According to the class of sheet flammability specified in the UL standard (UL796), the substrate can be divided into four categories, namely UL94V0, UL94V1, UL94V2 and HB. Their combustion rating is reduced sequentially, with V0 being the highest flame retardant rating and HB being the lowest flame retardant rating.
Their experimental method is to take three samples of the same size and thickness, and test their combustion rate under the specified temperature and humidity conditions, the slower the speed, the higher the flame retardant grade.
Usually, the PCB board of Shenlian will be printed with the UL94V-0 logo on the character layer, which is the highest flame retardant grade. The top E234156 is the UL number of the deep connection circuit, the middle is the logo of the deep connection multilayer circuit board, and the left one in the third row is the safety identification of electronic components, similar to the Chinese "brother" character has wood?
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Anonymous users2024-02-10PB and UL refer to the certifications or standards obtained for printed circuit boards (PCBs).
1.PB is an abbreviation for Printed Board, which means printed circuit board. The PB logo usually appears on the silkscreen of the PCB board
screen) to identify the manufacturer, production date, circuit version, and other information of the PCB board.
2.ul is for underwriters
The abbreviation of laboratories, which means American insurance laboratory. The UL logo is a safety certification of the PCB board, which often appears on the PCB board or on the product shell, indicating that the product meets the UL acceptance standards and meets certain safety performance and quality requirements.
For electronic products, obtaining UL certification can improve the market competitiveness of the product and make it easier for the product to pass the audit of the importing country and region.
It is important to note that PB and UL are not the same logo, they have different meanings. PB is used to identify the manufacturing information of the PCB board, while UL is the safety certification of the PCB board.
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Anonymous users2024-02-09The first is lead-free labeling.
The second is the UL Recognition Mark.
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Anonymous users2024-02-08What is PCB, explanation of computer terminology
The circuit board of the board is made of several layers of resin material bonded together, and the internal cable is traced with copper foil. There are layers, in the four-layer PCB circuit board, the top and bottom two layers are the signal layer, the middle two layers are the ground layer and the power supply layer, and the ground and power supply layers are placed in the middle, so that the signal line can be easily corrected. On the other hand, the six-layer PCB circuit board has three or four signal layers, a ground plane, and one or two power planes to provide sufficient power**.
Eight-layer PCB circuit boards can provide better performance.
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