United States Government Publishing Office publisher pbl distributor dst United States Commerce Department National Institute of Standards and Technology (NIST) author aut Government Organization Zarobila, Clarence J. author aut text government publication eng GOVPUB Executive Agency Publications executive 2023-10-27 Commerce Department 2022-08-17 monographic deposited born digital 40 digital object pages C 13. https://www.govinfo.gov/app/details/GOVPUB-C13-5847f49dd3ecf39fa39c5ba7eb67104b P0b002ee1c1bb3267 on1389890473 (OCoLC)1389890473 DGPO 2023-10-27 2026-06-27 GOVPUB-C13-5847f49dd3ecf39fa39c5ba7eb67104b machine generated eng fdlp C13 GOVPUB-C13-5847f49dd3ecf39fa39c5ba7eb67104b 5847f49dd3ecf39fa39c5ba7eb67104b GOVPUB NIST Special Publications NOTE: THE “DATE ISSUED” ABOVE MAY DEFAULT TO JANUARY 1ST OF A GIVEN YEAR. TO THE VIEW THE MOST ACCURATE DATE OF ISSUE, REVIEW THE TITLE PAGE OF THE PUBLICATION. This series includes proceedings of conferences sponsored by NIST, NIST annual reports, and other special publications appropriate to this grouping such as wall charts, pocket cards, and bibliographies. National Institute of Standards and Technology Commerce Department. National Institute of Standards and Technology. 2022 2022-08-17 https://www.govinfo.gov/app/details/GOVPUB-C13-5847f49dd3ecf39fa39c5ba7eb67104b https://www.govinfo.gov/content/pkg/GOVPUB-C13-5847f49dd3ecf39fa39c5ba7eb67104b/pdf/GOVPUB-C13-5847f49dd3ecf39fa39c5ba7eb67104b.pdf Densitometer (Meteorological instrument) diffuse influx Diffuse transmission Transmission density Standard reference materials Zarobila, Clarence J. creator Zarobila, Clarence J. Vest, Robert E. Nadal, Maria E. National Institute of Standards and Technology (U.S.) Physical Measurement Laboratory mdu U.S. Dept. of Commerce, National Institute of Standards and Technology 2022-08-17. monographic 1 online resource (40 pages) : illustrations (black and white) text technical report eng This document, SP250-99 (2022), NIST Measurement Services: Diffuse Visual Transmission Density, describes the instrument used to measure diffuse visual transmission density of both x-ray and photographic film step tablets. These step tablets replace former Standard Reference Material (SRM) offerings SRM1001 and SRM1008. The instrument is fully automated and is designed and characterized to comply with the international standards for measuring transmission density using the diffuse influx mode. Transmission densities as great as four can be measured with an expanded uncertainty (k = 2) of 0.006. Clarence J. Zarobila; Robert E. Vest; Maria E. Nadal. August 2022. Title from PDF title page (viewed January 4, 2023). Includes bibliographical references. Approved by the NIST Editorial Review Board on 2022-08-11 Mode of access: World Wide Web. Systems requirements: Adobe Acrobat PDF reader. Standard reference materials Densitometer (Meteorological instrument) Diffuse transmission diffuse influx Transmission density https://doi.org/10.6028/NIST.SP.250-99