If you are an ASTM Compass Subscriber and this document is part of your subscription, you can access it for free at ASTM Compass
    ASTM B885 - 09(2020)

    Standard Test Method for Presence of Foreign Matter on Printed Wiring Board Contacts

    Active Standard ASTM B885 | Developed by Subcommittee: B02.11

    Book of Standards Volume: 02.04

      Format Pages Price  
    PDF 3 $48.00   ADD TO CART
    Hardcopy (shipping and handling) 3 $48.00   ADD TO CART

    Significance and Use

    5.1 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.

    5.2 Practice B667 describes a more general procedure for measuring contact resistance of any solid material in practically any geometrical form. The method in Practice B667 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 B667 describes another contact resistance probe method that has more general application to electrical contacts of various materials and shapes. Practice B667 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, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.

    1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    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

    ICS Code

    ICS Number Code 31.180 (Printed circuits and boards)

    UNSPSC Code

    UNSPSC Code 26121700(Wiring harness)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/B0885-09R20

    Citation Format

    ASTM B885-09(2020), Standard Test Method for Presence of Foreign Matter on Printed Wiring Board Contacts, ASTM International, West Conshohocken, PA, 2020, www.astm.org

    Back to Top