After the PCB board layout is complete, the board should be checked for design rules to ensure that the board meets the design requirements and that all nets are properly connected. So, author from qihe smt pick and place machine tell you about commonly used inspection items in design rule inspection are as follows
a. Whether the distances between lines and lines, lines and component pads, lines and vias, component pads and vias, and vias and vias are reasonable and whether they meet production requirements.
b. Whether the width of the power line and the ground line is appropriate. whether the power supply and the ground line are tightly coupled, and whether there is any place where the ground line can be widened.
c. Whether the best measures have been taken for the key signal lines, such as the shortest length, the protection line, the input line and the output line are clearly separated.
d. Whether the analog circuit and digital circuit have their own independent ground wires.
e. Whether the graphics (such as icons, labels) added to the PCB will cause short circuit of the signal.
f. Whether to modify some unsatisfactory lines.
g. Whether there is a process line on the PCB, whether the solder mask meets the requirements of the production process.whether the solder mask size is appropriate, and whether the character logo is pressed on the device pad.
h. Whether the edge of the outer frame of the power ground layer in the multi-layer board is reduced, such as the exposure of the copper foil of the power ground layer.it is easy to cause a short circuit.
The design rule inspection results can be divided into two types: one is Report (report) output, which generates a report of inspection results
the other is On Line inspection, which is to inspect the electrical rules and wiring rules of the circuit board during the wiring process.Read more: How to verify PCB drawing design fits the SMT PNP
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QHSMT is an enterprise specializing in the production of SMT equipment, like pick and place machine ，reflow oven，stencil printer ，smt pick and place machine,pnp,pick&place,pcb assembly,smd chip shooter,pnp machine,chip mounter,smt line,welcome to send inquiry
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Qihe SMT pick and place machine catalog
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Qihe smt pick and place machine
WHAT IS SMT pick and place machine？
SMT (Surface Mounted Technology) is a comprehensive system engineering technology, which covers substrates, design, equipment, components, assembly processes, production accessories and management. When it comes to SMT pick and place machines, the automatic SMT production line requires automatic loading and unloading machine, automatic solder paste printing machine, placement machine, reflow soldering machine, AOI inspection equipment, connecting table, etc. For these SMT assembly line equipment, Qihe SMT can offer you machines in prototype SMT line, small SMT production line, mass production SMT line at low SMT line cost. Contact us now if you are interested.
WHAT IS SMT ASSEMBLY LINE？
With the development of technology, future electronic products will be lighter, smaller and thinner. Traditional assembly technology can no longer meet the requirements of high-precision and high-density assembly. A new type of PCB assembly technology-SMT (Surface Mount Technology) has emerged. SMT Assembly is the use of automated machines to assemble electronic components on the surface of the circuit board. Its density, high speed, standardization and other characteristics occupies an absolute advantage in the field of circuit assembly technology. In addition, SMT assembly has a wide range of uses.
WHAT IS SMT PROCESS？
There are mainly three steps in SMT assembly line process flow： solder paste printing, components placement and reflow soldering.
- Solder Paste Printing
Its function in SMT line process is to print the solder-free paste on the pads of the PCB to prepare for the soldering of the components. The equipment used is a screen printing machine, located at the forefront of the SMT production line.
- Components Placement
Its function is to accurately install the surface mount components on the fixed position of the PCB. The equipment used is a placement machine, located behind the screen printing machine in the SMT production line.
- Reflow Soldering
Its function in SMT manufacturing line is to melt the solder paste so that the surface mount components and the PCB board are firmly bonded together. The equipment used is a reflow oven, located behind the placement machine in the fully automatic SMT production line.