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18 results for “Interlaboratory comparison”
Organization, performance, and evaluation of measurements on the same or similar items by two or more laboratories under predetermined conditions. ISO/IEC 17043:2023…
The statistical toolbox for proficiency testing: assigned values, performance statistics such as z-scores and En numbers, and homogeneity/stability assessment. ISO/IEC Statistics
Measurement precision under reproducibility conditions — what interlaboratory comparisons quantify. VIM (JCGM 200:2012) 2.25 Statistics
A standard, sometimes of special construction, intended for transport between locations — the artifacts that carry interlaboratory comparisons. VIM (JCGM 200:2012) 5.8 Standards…
Evaluation of participant performance against pre-established criteria by means of interlaboratory comparisons — an ISO/IEC 17025 requirement for demonstrating ongoing competence. ISO/IEC…
The interlaboratory comparison statistic En = (x − X) / √(U²(x) + U²(X)). |En| ≤ 1 indicates agreement within expanded uncertainties; it is the standard scoring for…
…Someof thesearethemaintenanceofadditionalprimarystandards,interlaboratory comparisonsofprimarystandardsofthesameordifferentdesigns,andthe maintenanceofabankofcheckstandards. Wehaveadoptedallthreeofthese methods . COMPARISONSAGAINSTADDITIONALNISTPRIMARYSTANDARDS Theoriginalprimaryhighvacuumstandardinusebefore1984[11]was suitableonlyforthedirectcalibrationofearlymoleculardraggages. It wasbasedontheintegratingprincipleoftheMDGrotorandtheintegrating capabilitiesoftheMDGcontroller,andwasoperatedbyexhaustingaknown volu-^eofgasintothechamber("gasburst"method). TheMDGsrespondnotto pressurepersebuttomolecularfluxandthedecelerationexperiencedbythe gageswasduetothetotalnumberofmoleculesstrikingtheballsurface…
…Interlaboratory comparisonsamongthenationalstandardslaboratories ofother countriesprovideexcellentmeansforcheckingthehighestaccuracymeasurements. Twointernationalcomparisonshavebeenconductedoverthepast25yearsinwhich NISTdirectlyparticipated. In1965acomparisonwasconductedbetweenNISTandtheNationalResearch Council(NRC),Canada.Twomultirange,audio-frequencycurrenttransformerswere used[11].Thenominalratiosrangedfrom1:1to6:1.Thetestswereconducted between400Hzand10kHz.Atthefrequenciesoftheprimaryinterest,400and 1000Hz,theagreementwaswithin0…
…Use of externally obtained data from calibrations, proficiency tests, and interlaboratory comparisons in the assessment of errors and bias in measurement results; and g…
…control through surveillance assessments, and ongoing stability as demonstrated through multiple interlaboratory comparisons or proficiency tests. Calibration intervals may be lengthened or shortened by…
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