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Description of ASTM-B885 2009ASTM B885 - 09Standard Test Method for Presence of Foreign Matter on Printed Wiring Board ContactsActive Standard ASTM B885 | Developed by Subcommittee: B02.11 Book of Standards Volume: 02.04 ASTM B885Significance and Use This test method provides a way to detect contamination on printed wiring board fingers that affects the electrical performance of such fingers. Such contamination may arise during PWB manufacture, circuit assembly, or service life and may include solder mask, solder flux, hardened lubricants, dust, or other materials. This test method provides a nondestructive method of inspecting such fingers at any point in the life of the product including after original manufacture, after assembly of circuit components to the PWB, and after time in service such as when returned for repair. Because this test method uses two probes to finger contacts in series, it provides a sensitive test for contaminants that may increase electrical resistance when the fingers are plugged into an edgecard connector that typically makes contact to the finger through only one contact to finger interface. Practice B 667 describes a more general procedure for measuring contact resistance of any solid material in practically any geometrical form. The method in Practice B 667 should be used for general studies and fundamental studies of electrical contact materials. 1. Scope 1.1 This test method defines a resistance probing test for detecting the presence of foreign matter on Printed Wiring Board (PWB) contacts or fingers that adversely affects electrical performance. This test method is defined specifically for such fingers coated with gold. Application of this test method to other types of electrical contacts or to fingers coated with other materials may be possible and desirable but may require some changes in fixturing, procedures, or failure criteria. 1.2 Practice B 667 describes another contact resistance probe method that has more general application to electrical contacts of various materials and shapes. Practice B 667 should be used for more fundamental studies. This test method provides a fast inspection method for printed wiring board fingers. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar will all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.
ASTM Standards B539 Test Methods for Measuring Resistance of Electrical Connections (Static Contacts) B542 Terminology Relating to Electrical Contacts and Their Use B667 Practice for Construction and Use of a Probe for Measuring Electrical Contact Resistance Keywords contact resistance; contamination; edgecard connector; printed wiring board fingers; Contact resistance; Contamination; Edgecard connector; Electrical contact materials; Foreign matter content; Printed wiring board (PWB) contacts/fingers; Wiring boards; ICS Code ICS Number Code 31.180 (Printed circuits and boards) DOI: 10.1520/B0885-09 ASTM International is a member of CrossRef. ASTM B885The following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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