scan barcode asp.net mobile HOW TO DEVELOP ACCEPTABILITY AND QUALITY CRITERIA in Software

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HOW TO DEVELOP ACCEPTABILITY AND QUALITY CRITERIA
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Using Industry Standards There are both advantages and disadvantages to using industry standards for acceptability and quality requirements. 51.9.1.1 Advantages International standards represent a consensus of what is possible and common for acceptance. They increase the likelihood of PCB users getting what they expected. The PCB manufacturer is unlikely to become as expert in complying with a customer specification as it would an industry standard. The more experience the quality personnel at the PCB manufacturer obtain in acceptability criteria, the better they will be at spotting nonconformance. Industry standards are a great place to start developing company-specific requirements for acceptability and quality.
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51.9.1.2 Disadvantages International standards are developed by a cross section of the industry. The resultant standards often represent the least common denominator requirements in order to satisfy the broad range of participation. Although these standards may meet most of a PCB buyer s needs, they often leave deficiencies that necessitate additional requirements being imposed upon the PCB supplier.
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By nature, international standardization efforts always lag the state-of-the-art in the industry. Standards can over- or underspecify requirements for an industry segment s needs.
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Industry Specifications The following are lists of the most commonly used specifications for PCBs. IPC standards are the most widely used in the industry and therefore are referenced in this chapter as examples. 51.9.2.1 Defence Supply Center Columbus (DSCC) MIL-PRF-55110, Printed Wiring Board, Rigid, General Specification for MIL-PRF-31032, Printed Circuit Board/Printed Wiring Board, General Specification for MIL-P-50884, Printed Wiring Board, Flexible or Rigid-Flex, General Specification for
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51.9.2.2 International Electrotechnical Commission (IEC) IEC-61188, Design of Printed Boards and Printed Board Assemblies IEC-62326, Printed Board Performance for Capability Approvals IEC-61189, Test Methods for Printed Boards and Printed Board Materials and Printed Board Assemblies
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51.9.2.3 Institute for Interconnecting and Packaging Electronic Circuits (IPC) ANSI/J-STD-003, Solderability Tests for Printed Boards IPC-1710, OEM Standard for Printed Board Manufacturer s Qualification Profile (MQP) IPC-4552, Specification for Electroless Nickel/Immersion Gold (ENIG) Plating for Printed Circuit Boards IPC-4553, Specification for Immersion Silver Plating for Printed Circuit Boards IPC-A-600, Acceptability of Printed Boards IPC-6012, Qualification and Performance Specification for Rigid Printed Boards IPC-6013, Qualification and Performance Specification for Flexible Printed Boards IPC-6016, Qualification and Performance Specification for High Density Interconnect (HDI) Layers or Boards IPC-6202, IPC/JPCA Performance Guide Manual for Single- and Double-Sided Flexible Printed Wiring Boards IPC-TM-650, Test Methods Manual
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51.9.2.4 Japan Printed Circuit Association (JPCA) JPCA-PB01 Printed Wiring Boards JPCA-HD01 HDI Printed Wiring Boards JPCA-DG01 Design Guide for Multilayer Printed Wiring Boards JPCA-DG02 Performance Guide for Single- and Double-Sided Flexible Printed Wiring Boards
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51.9.2.5 Underwriters Laboratories (UL) UL-94, Flammability Testing UL-796, Standard for Safety for Printed Wiring Boards UL-796F, Flexible Materials Interconnect Constructions
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ACCEPTABILITY AND QUALITY OF FABRICATED BOARDS
Using Customer Standards Customer standards should reflect the unique nature and needs of the company s products. Unfortunately, company history often can affect these criteria and overemphasize criteria for failures that were previously experienced. It is recommended that customer standards be used to augment, not replace, industry standards. Consider the following when creating a customer standard:
Understanding where and how the product will be used can influence the use of extended or reduced criteria in specific requirement areas. Understanding the stresses to which the assembly process exposes the PCB is fundamental in defining the acceptability criteria. Process elements such as leaded or lead-free, reflow or wave solder, double-sided reflow, hand-soldering, and rework all significantly impact the requirements of the PCB.
CLASS OF SERVICE
Functionality through operational life should be the ultimate criteria for acceptance. To account for the fact that a PCB will see different end-use environments and conditions, acceptance criteria are typically broken into three classes of service. Each company must establish the level of acceptance as it is dependent on the functional criteria to which the PCB will be subjected. The IPC has established recommended guidelines for acceptance, based on end use, categorized as Classes 1, 2, and 3. The following subsections describe the classes.
Class 1: General Electronic Products Class 1 includes consumer products and some computer and computer peripherals suitable for applications where cosmetic imperfections are not important and the major requirement is the functioning of the completed PCB.
Class 2: Dedicated Service Electronic Products This class consists of communication equipment, sophisticated business machines, and instruments for which high performance and extended life are required, and for which uninterrupted service is desired but is not critical. Certain cosmetic imperfections are allowed.
Class 3: High-Reliability Electronic Products Equipment and products for which continued performance or performance on demand is critical belong in Class 3. Equipment downtime cannot be tolerated, and the equipment must function when required (e.g., life support systems, flight control systems). PCBs in this class are suitable for applications in which high levels of assistance are required and service is essential.
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