Acceptability of PCB Board refers to the semi-finished products or finished products to be tested, should comply with various operating conditions and written guidelines. Acceptance refers to the process of performing acceptance tests, such as Acceptance Test. Acceptable Quality Level(AQL) refers to the inspection at sampling, that can meet the engineering requirements of the bad rate cap, AQL is for the continuous batch of quality assurance. Automatic optical inspection is the use of ordinary light or laser light with the computer program to do visual inspection for the surface of Printed Circuit Board, to replace the manual inspection of optical equipment. When a particular personnel training or quality test is completed and meets a certain professional standard.