Since the embedded system adopts a microprocessor to implement a relatively single function and a separate operating system, a large number of peripheral devices are often not required. Therefore, in terms of volume and power consumption, embedded system
Rosin. As you probably know, flux is usually a mixture that rosin is as the main component, which is an auxiliary material to ensure the smooth progress of the welding process and whose main component is C20H3002.
Copper. No matter which kind of PCB substrate, they are virtually coated with copper on the substrate.
While gold and silver are only used for surface treatment as well as silver paste plug hole.
Bare PCB testing is mainly to test whether the PCB exist short circuit or open circuit, and the common testing methods are flying probe test and PCB testing jig test.