What are the PCB characteristics inspection items?

PCB After the circuit board is completed , Verify whether the characteristics of the circuit board meet the drawing design and quality standards , The circuit board must be checked for characteristics . that ,PCB What are the inspection items for circuit board characteristics ？

1、 Electrical characteristic inspection items ：
（1） Whether the wire resistance is analyzed 、 inductance 、 Influence of capacitance ?
（2） Whether the spacing and shape of wire accessories meet the insulation requirements ？
（3） Whether the insulation resistance value is controlled and specified at key parts ？
（4） Whether the polarity is fully identified ？
（5） Whether to measure the effect of wire spacing on leakage resistance from a geometric point of view 、 Effect of voltage ？
（6） Have the media used to change the surface coating been identified ？

2、 Physical property inspection items ：
（1） Whether all pads and their positions are suitable for final assembly ？
（2） Whether the assembled printed circuit board meets the impact and vibration conditions ？
（3） What is the spacing of the specified standard elements ？
（4） Are the loosely installed components or heavy components fixed ？
（5） Is the heat dissipation and cooling of heating elements correct ? Are they isolated from the printed circuit board and other thermal components ？
（6） Are voltage dividers and other multi lead components correctly positioned ？
（7） Is the element arrangement and orientation easy to check ？
（8） Whether all possible interferences of the printed circuit board and the assembly on the whole board have been eliminated ？
（9） Whether the size of the locating hole is correct ？
（10） Whether the tolerance is complete and reasonable ？
（11） The physical properties of all coatings have been controlled and qualified ？
（12） Whether the diameter ratio of hole and lead wire is within the acceptable range ？

The above is what the professional engineer introduced to you PCB Circuit board characteristic inspection items , Do you understand ？

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