Printed circuit board can be divided into rigid printed circuit board and flexible printed circuit board according to the production materials. Flexible circuit board is commonly known as FPC, that is, printed circuit board made of flexible insulating substrate. It is mainly used for communication, mobile phones, laptops, LCD and other products. In addition, some manufacturers have begun to replace copper wire harness with FPC in power battery.
In many smart phone PCB designs, the FPC flexible circuit board used in the phone fold needs to be very flexible, which is required by brand phone manufacturers to be more than 80000 times. Therefore, FPC FPC is a key factor affecting the quality of folding mobile phones. Today, SPEA will popularize the FPC FPC test method.
There are two main methods for testing flexible circuit boards: needle bed test and flying needle test
Needle bed test: The traditional flexible circuit board test mostly uses a needle bed tester, which uses multiple probes to contact all the parts on the board that need to be measured at the same time, and then measures the characteristics of these electronic parts in sequence by means of program control, mainly in sequence, supplemented by juxtaposition. Generally, it takes only about 1 minute to test all the parts on a flexible circuit board, and the more circuit board parts, the longer the test time.
There are also some disadvantages when using a needle bed for flexible circuit testing: the minimum diameter of the probe is limited, and some parts with too small diameter are difficult to test with a needle bed jig. When the distance between test points is too small, the needle bed cannot be used, and in addition, needles cannot be planted near high parts.