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Description of ASTM-F1844 2016ASTM F1844-97-Reapproved2016Withdrawn Standard: Standard Practice for Measuring Sheet Resistance of Thin Film Conductors For Flat Panel Display Manufacturing Using a Noncontact Eddy Current Gage (Withdrawn 2023)ASTM F1844Scope 1.1 This practice describes methods for measuring the sheet electrical resistance of sputtered thin conductive films deposited on large insulating substrates (glass or plastic), used in making flat panel information displays. 1.2 This practice is intended to be used with Test Methods F673. This practice pertains to a “manual” measurement procedure in which an operator positions the measuring head on the test specimen and then personally activates the test apparatus. The resulting test data may be tabulated by the operator, or, alternatively, sent to a computer-based data logging system. Both Methods I and II of Test Methods F673 (paragraphs 3.1 through 3.3.3 of Test Methods F673) are applicable to this practice. 1.3 Sheet resistivity in the range 0.020 to 3000 Ω per square (sheet conductance in the range 3 by 10–4 to 50 mhos per square) may be measured by this practice. The sheet resistance is assumed to be uniform in the area being probed. Note 1: Typical manual test units, as described in this practice, measure and report in the units “mhos per square”; this is the inverse of “ohms per square.” 1.4 This practice is applicable to flat surfaces only. 1.5 This practice is non-destructive. It may be used on production panels to help assure production uniformity. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 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 establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Keywords conductance; electrical conductance; electrical resistance; electrical sheet conductance; electrical sheet resistance; flat panel displays; noncontact eddy current; resistance; sputtered thin films; thin conductive films on glass; thin film; ICS Code ICS Number Code 31.120 (Electronic display devices) DOI: 10.1520/F1844-97R16 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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