important and the major requirement is function of the completed printed board. Class 2 Dedicated Service Electronic Products Includes communications equipment, sophisticated business machines, instruments instruments where high performance and extended life is required and for which uninterrupted service is desired but not critical. Certain cosmetic imperfections are allowed. Class 3 High Reliability Electronic boards in this class are suitable for applications where high levels of assurance are required and service is essential. PCB Types In IPC-6012B there are also 6 Types of PCB defined: Printed Boards without

important and the major requirement is function of the completed printed board. Class 2 Dedicated Service Electronic Products: Includes communications equipment, sophisticated business machines, instruments instruments where high performance and extended life is required and for which uninterrupted service is desired but not critical. Certain cosmetic imperfections are allowed. Class 3 High Reliability Electronic boards in this class are suitable for applications where high levels of assurance are required and service is essential. PCB Types In IPC-6012B there are also 6 Types of PCB defined: Printed Boards without

important and the major requirement is function of the completed printed board. Class 2 Dedicated Service Electronic Products: Includes communications equipment, sophisticated business machines, instruments instruments where high performance and extended life is required and for which uninterrupted service is desired but not critical. Certain cosmetic imperfections are allowed. Class 3 High Reliability Electronic boards in this class are suitable for applications where high levels of assurance are required and service is essential. PCB Types In IPC-6012B there are also 6 Types of PCB defined: Printed Boards without

important and the major requirement is function of the completed printed board. • Class 2 Dedicated Service Electronic Products Includes communications equipment, sophisticated business ma- chines, instruments instruments where high performance and extended life is required and for which uninterrupted service is desired but not critical. Certain cosmetic imperfections are allowed. • Class 3 High Reliability Electronic boards in this class are suitable for applications where high levels of assurance are required and service is essential. PCB Calculator 7 / 7 2.7.2 PCB Types In IPC-6012B there are also 6 Types of PCB

important and the major requirement is function of the completed printed board. Class 2 Dedicated Service Electronic Products: Includes communications equipment, sophisticated business machines, instruments instruments where high performance and extended life is required and for which uninterrupted service is desired but not critical. Certain cosmetic imperfections are allowed. Class 3 High Reliability Electronic boards in this class are suitable for applications where high levels of assurance are required and service is essential. PCB Types In IPC-6012B there are also 6 Types of PCB defined: Printed Boards without

important and the major requirement is function of the completed printed board. Class 2 Dedicated Service Electronic Products: Includes communications equipment, sophisticated business machines, instruments instruments where high performance and extended life is required and for which uninterrupted service is desired but not critical. Certain cosmetic imperfections are allowed. Class 3 High Reliability Electronic boards in this class are suitable for applications where high levels of assurance are required and service is essential. PCB Types In IPC-6012B there are also 6 Types of PCB defined: Printed Boards without

important and the major requirement is function of the completed printed board. Class 2 Dedicated Service Electronic Products: Includes communications equipment, sophisticated business machines, instruments instruments where high performance and extended life is required and for which uninterrupted service is desired but not critical. Certain cosmetic imperfections are allowed. Class 3 High Reliability Electronic boards in this class are suitable for applications where high levels of assurance are required and service is essential. PCB 类型 在 IPC-6012B 中，还定义了 6 种类型的 PCB： 无电镀通孔的电路板 (1) 1 单面板 和带电镀通孔的电路板（2-6） 2 双面板