refers to the industry-standard document titled Documentation Requirements for Printed Boards, Assemblies and Support Drawings . This standard establishes the general requirements for creating the technical drawings and data packages necessary to fully describe end-product printed circuit boards (PCBs) and assemblies. Purpose and Scope of IPC-D-325
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D-325 demands no less than 1:1 scale for critical dimensions or a clear scale box. If the PDF has been digitally compressed, check that a 1-inch scale bar actually measures 1 inch on your screen (print at 100%). In the era before fully digital, integrated manufacturing
In the era before fully digital, integrated manufacturing workflows, the "fabrication drawing" was the supreme document. IPC-D-325 established the rules for what information this drawing must contain. It ensured that when a designer sent a package to a fabricator, no critical information was missing.