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About This Item
Full Description
1.1 This practice describes the instrumental determination of retroreflected chromaticity coordinates of retroreflectors. It includes the techniques used in a photometric range to measure retroreflected (nighttime) chromaticity with either a telecolorimeter or telespectroradiometer.
1.2 This practice covers the general measurement procedures. Additional requirements for specific tests and specifications are described in Section 7.
1.3 The description of the geometry used in the nighttime colorimetry of retroreflectors is described in Practice E808 and the methods for calculation of chromaticity are contained in Practice E308.
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 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.
Document History
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ASTM E811-09(2020)e1
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Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions- Most Recent
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ASTM E811-09(2015)
Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions- Historical Version
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ASTM E811-09
Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions- Historical Version
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ASTM E811-95(2001)
Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions- Historical Version
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ASTM E811-95
Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions- Historical Version