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Significance and Use
5.1 Many competent measurement laboratories comply with accepted quality system requirements such as ISO 9001, QS 9000, or ISO 17025. When using standard test methods, the measurement results should agree with those from other similar laboratories within the combined uncertainty limits of the laboratories’ measurement systems. It is for this reason that quality system requirements demand that a statement of the uncertainty of the test results accompany every test result.
5.2 Preparation of uncertainty estimates is a requirement for laboratory certification under ISO 17025. This practice describes the procedures by which such uncertainty estimates may be calculated.
1.1 This practice describes a protocol to be utilized by measurement laboratories for estimating and reporting the uncertainty of a measurement result when the result is derived from a measurand that has been obtained by spectrophotometry.
1.2 This practice is specifically limited to the reporting of uncertainty of color measurement results that are reported as color-differences in ΔE format, even though the measurement itself may be reported in other units such as percent reflectance or transmittance.
1.3 The procedures defined here are not intended to be applicable to national standardizing laboratories or transfer laboratories.
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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D2244 Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E284 Terminology of Appearance
ISO StandardsISO9001 Quality Management Systems--Requirements ISO/IEC17025 General Requirements for the Competence of Calibration and Testing Laboratories
Other StandardQS9000 Quality Systems Requirements Chrysler Corporation, Ford Motor Company, General Motors Corporation
ICS Number Code 17.180.20 (Colours and measurement of light); 71.040.50 (Physicochemical methods of analysis)
UNSPSC Code 41115406(Spectrophotometers)
ASTM E2867-14, Standard Practice for Estimating Uncertainty of Test Results Derived from Spectrophotometry, ASTM International, West Conshohocken, PA, 2014, www.astm.orgBack to Top