scan barcode asp.net mobile ACCEPTABILITY OF PRINTED CIRCUIT BOARD ASSEMBLIES in Software

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Military, Space, and Commercial Specifications Reference to these types of specifications is common in the applicable markets. No great amount of detail will be discussed; however, they are all worthy of some discussion since they can provide a great deal of insight into the rationale of product acceptability and its origin. 52.1.2.1 Military Specifications. Military specifications have been widely accepted for use in many markets outside of their intended military products. The one with the most relevance to workmanship or acceptability criteria at the assembly level was MIL-STD-2000, a unified standard created from several individual services and production standards. It was created to combine the various requirements into a single standard to make it easier for military contractors to implement a single performance requirement. Many lower-level supporting specifications for components, designs, materials, and printed circuit boards (PCBs) were part of the family of documents to support performance and acceptance requirements as a package. Each specification was designed to be compatible with the eventual success of the end product. In an effort to increase understanding by all of the parties involved, and to ease compliance issues, the services provided training and certification at various locations throughout the country, and even at some international locations. The typical training audience often included customer representatives as well as producers.The title of MIL-STD-2000 was Standard Requirements for Soldered Electrical and Electronic Assemblies. However, all of the military soldering requirements standards, including MIL-STD-2000, have been rescinded for future production through DoD acquisition reform initiatives. Nevertheless, some products still use the requirements because they have been adopted internationally and because they provide relative benefit for the product s specific industry segment. MIL-STD-2000 was an extensive document that defined the nonconformance conditions that required disposition as rework, repair, or use as is. This of course required some action by the manufacturer to evaluate a given defect anomaly and make a decision regarding its impact on the form, fit, or function of the intended use. It also allowed some level of customer involvement concerning these decisions if the contract prescribed it. MIL-STD-2000 also limited the assembly materials for a manufacturer in terms of the solder alloys, flux activity levels, cleanliness, conformal coating, solder mask, and their acceptance conditions, either through a flow down to a supporting specification or internal requirements. Any deviation from standardized process and materials as specified in these documents required qualification and/or customer consent before use. However, the document allowed flexible contractual application dependent upon the product demands for performance. General Requirements for standard production were much less stringent than Detail Requirements, which were used for demanding performance or consequence products such as those intended for missile or space applications. Contracts were required to specify Detail Requirements before they were imposed; otherwise, only the General Requirements were required as a default.The intent of flexible requirements was to allow the use of a single standard for everything from complex weapon systems to office equipment. Unfortunately, they were not commonly applied that way, and the overly stringent requirements originally intended for critical systems were attached to applications such as office or communication products that did not benefit from the more stringent and costly production effort. Solder connection characteristics for both plated through-hole and surface-mount devices were defined by solder finish, fractures, voids, solder coverage and quantity, and wetting and filleting. The PCB requirements after assembly were detailed in terms of conductor finish and condition, conductor separation from the board, cleanliness of the assembly, weave exposure, delamination, measles, haloing, and bow and twist. In addition, part markings were expected to remain legible even after assembly processing. If specifically imposed by individual contract, the services provided, through established training resources, traceable training and certification of the people making decisions. This training provided a cadre of qualified instructors who in turn could train people for their company or organization. Its interesting that prior to elimination of these schools, the majority of
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