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Measurement services are available for dissemination of the scales of 0°/45° surface color and specular gloss at 20°, 60°, and 85° geometries. The primary purpose is to provide traceability to the scales, not for research on particular test items. These services are available as either calibrations or standard reference materials. In general, for a calibration service the customer supplies the test item, which is measured under the spectral and geometrical conditions specified by the customer. Standard reference materials are available for immediate purchase, and are calibrated under specific spectral and geometrical conditions. Calibrations Current fees can be found in the NIST Calibration Services User Guide Fee Schedule Optical Properties of Materials Measurements. Information on uncertainty, traceability, and other NIST Calibration Services can be found on the NIST Calibration Serivces web pages. For Special Tests, the pricing is based on actual costs, based on labor and time, the number of test items, and the number of data points. For actual pricing, contact the NIST staff listed below. The uncertainties reported here follow, to the extent possible, the ISO Guide to the Expression of Uncertainty in Measurement (International Organization for Standardization, Geneva, Switzerland, 1993). Since 1994, the NIST policy has been to conform to the Guide in reporting its activities, using an expanded uncertainty coverage factor (as defined in the Guide) of k = 2. See Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results for a detailed explanation of the NIST policy. Unless otherwise noted all uncertainties will be stated as k = 2. Descriptions of each calibration service ID number are provided below. Surface Color (38060S) Measurements of 0°/45° surface color can be made at wavelengths from 360 nm to 800 nm at 5 nm increments for non-fluorescent submitted test items. Measurements of spectral reflectance factor are performed at room temperature with the incident beam normal to the front surface of the test item and the receiver at a viewing angle of 45°. Items with dimensions from 5.08 cm to 10.2 cm perpendicular to the incident beam are routinely accommodated. Other sizes and measurement conditions are possible in consultation with NIST staff. The customer specifies the illuminant(s), observer(s), and color space(s) for calculations of the surface color. Uncertainty estimates will be given and will depend on the optical characteristics of the submitted test item. Arrangements for these measurements on submitted test items must be made before shipment. The decision to perform the measurements will rest with NIST. Test items not accepted for measurement will be returned. Special Tests of Specular Gloss (38090S) Measurements of specular gloss of customer-supplied test items can be performed for 20°, 60°, and 85° geometries according to the specifications given in ASTM D523 and ISO 2813. Arrangements for these measurements on submitted test items must be made before shipment. The decision to perform the measurements will rest with NIST. Test items not accepted for measurement will be returned. How to request calibration services The following criteria are used to determine acceptance of the calibration.
Calibration Program National Institute of Standards and Technology 100 Bureau Drive, Stop 2300 Gaithersburg, MD 20899-2300 Phone: 301-975-2002 Fax: 301-869-3548 E-mail: calibrations@nist.gov Web: NIST Calibration Services Ship the test item(s) to Maria Nadal NIST Bldg. 221, Room B352 Gaithersburg, MD 20899-8441 Phone: 301-975-4632 Fax: 301-869-5700 E-mail: maria.nadal@nist.gov Standard Reference Materials In addition to Calibration Services, NIST offers Standard Reference Materials (SRMs), which are prepared and used for three main purposes:
Table 1. SRMs provided for color and appearance quantities by the Optical Thermometry and Spectral Methods Group
Online: October 2003 |
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