Ipc Standardizes Electrical Testing Requirements Of Unpopulated Printed Boards

摘要

Little did Michael Green know that sending in a comment regarding IPC-9252 would set off a complete revision of the standard. As production design engineer for Lockheed Martin, Green recommended that Level C Continuity in Table 4-1 should be changed to 10 Ω, from 50 Ω. He believed that 50 Ω, is excessive resistance for a Class 3 trace, as anything greater than 10 Ω should be considered an open. He wrote, "My improvement satisfies the intent of the specification requirements listed below and our drawing requirements since 2000." The result is IPC-9252A, Requirements for Electrical Testing of Unpopulated Printed Boards, released in November 2008. IPC-9252A defines levels of appropriate testing and assists in the selection of the test analyzer, test parameters, test data, and fixturing required to perform electrical test(s) on unpopulated printed boards and inner layers.