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ITS-90
The International Temperature Scale of 1990: defined fixed points (e.g. the triple point of water, 273.16 K) and specified interpolation instruments through…
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50 results for “ITS-90”
NIST Measurement Services documentation: cryogenic resistance thermometer calibrations. Public domain; the full text is readable in the Atlas document library. NIST Temperature
The defined practical temperature scale: fixed points from 0.65 K upward and the interpolation instruments between them. Kept in force through the 2019…
…The International Temperature Scale of 1990 (ITS-90) assigns exact temperature values to a ladder of highly reproducible fixed points — the triple point of…
58 7.3 ITS-90 non-uniqueness uncertainty contribution to SPRT calibration uncertainties The ITS-90 contains three types of non-uniqueness labeled non…
…All calibrations are traceable to the ITS-90 through standard check thermometers owned and maintained by NIST. The ITS -90 defines temperatures from 0…
The interpolation instrument of the ITS-90 between defined fixed points over most of its range: a strain-free platinum resistor whose resistance ratio…
ABSTRACT ThisdocumentdescribestherealizationanddisseminationoftheInternationalTemperatureScale of1990(ITS-90)above700°CattheNationalInstituteofStandardsandTechnology(NIST).By usingfundamentalprinciplesofblackbodyphysics,theITS-90scaleisfirstfixedatthefreezing pointofgold(790=1064.18°C)andisthenextendedtotemperaturesbetween700°Cand 2700°Cbydeterminingtheratioofthespectralradianceofatungstenribbonfilamentlampto thatofagoldfixed-pointblackbodyatawavelengthof655.3nm…
Documents
SP 330 — International System of Units
…The CIPM notes that, by comparison with the IPTS-68, the ITS-90 • extends to lower temperatures, down to 0.65 K, and hence…
…Therefore, Eq. (A49) reduces to .)t,,( ),( )t,,( ),( )p,,()s,,( )90,,()0,,( )90,t,,()0,t,,( i ii it ii21 it21it21…