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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">izmertech</journal-id><journal-title-group><journal-title xml:lang="ru">Измерительная техника</journal-title><trans-title-group xml:lang="en"><trans-title>Izmeritel`naya Tekhnika</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0368-1025</issn><issn pub-type="epub">2949-5237</issn><publisher><publisher-name>ФГУП "ВНИИФТРИ"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32446/0368-1025it.2025-3-113-117</article-id><article-id custom-type="elpub" pub-id-type="custom">izmertech-2356</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКО-ХИМИЧЕСКИЕ ИЗМЕРЕНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICOCHEMICAL MEASUREMENTS</subject></subj-group></article-categories><title-group><article-title>Актуализация опорного значения вязкости воды как значимого элемента системы метрологического обеспечения исследований в области реологии жидких сред</article-title><trans-title-group xml:lang="en"><trans-title>Updating the reference value viscosity of water as an important element of the metrological support system for research in the field of rheology liquid media</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0005-0472-6962</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Неклюдова</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Nekliudova</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Анастасия Александровна Неклюдова</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Anastasia A. Nekliudova</p><p>St. Petersburg</p><p> </p></bio><email xlink:type="simple">A.A.Tsurko@vniim.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Всероссийский научно-исследовательский институт метрологии им. Д. И. Менделеева; &#13;
Санкт-Петербургский государственный университет аэрокосмического приборостроения</institution><country>Россия</country></aff><aff xml:lang="en"><institution>D. I. Mendeleyev Institute for Metrology; &#13;
Saint-Petersburg State University of Aerospace Instrumentation</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>14</day><month>07</month><year>2025</year></pub-date><volume>74</volume><issue>3</issue><fpage>112</fpage><lpage>117</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Неклюдова А.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Неклюдова А.А.</copyright-holder><copyright-holder xml:lang="en">Nekliudova A.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.izmt.ru/jour/article/view/2356">https://www.izmt.ru/jour/article/view/2356</self-uri><abstract><p>Исследование посвящено метрологическому обеспечению реологических измерений жидких сред, в частности, необходимости актуализации опорного значения вязкости воды, используемого для калибровки вискозиметров. Актуализация связана с тем, что существующие справочные данные об опорном значении, представленные в разных источниках, достаточно разрозненны, что может приводить к несогласованности результатов реологических исследований. Рассмотрен метод ступенчатой калибровки (step up method), применяемый для определения постоянных измерительных приборов. Обоснована целесообразность актуализации документов OIML D 17:1987 ”Hierarchy scheme for instruments measuring the viscosity of liquids”, ГОСТ 21727-76 «Вода. Вязкость при температуре 20 °С» и ГСССД 6-89 «Таблицы стандартных справочных данных. Вода. Коэффициент динамической вязкости при температурах 0...800 °С и давлениях от соответствующих разреженному газу до 300 МПа» в связи с использованием в них неактуальных значений динамической и кинематической вязкости воды. Изучено влияние опорных значений вязкости на измерительные возможности Российской Федерации. Приведены данные ключевых сличений по вязкости Международного бюро мер и весов CCM.V-K4:2018, демонстрирующие эквивалентность лабораторий. Полученные результаты способствуют повышению точности и согласованности измерений вязкости в Российской Федерации, что имеет важное значение для обеспечения единства измерений в промышленности и научных исследованиях.</p></abstract><trans-abstract xml:lang="en"><p>The study focuses on the metrological support of rheological measurements of liquid media, particularly the updating of the reference value viscosity of water used in viscometer calibration. The need to update the reference value viscosity of water is justified by the fact that existing reference data on its value, presented in various sources, are quite fragmented, which may lead to inconsistencies in rheological research. The step-up calibration method, used to determine the constants of measuring instruments, is examined. The study substantiates the necessity of updating the documents OIML D 17:1987 “Hierarchy scheme for instruments measuring the viscosity of liquids”, GOST 21727-76 “Water. Viscosity at 20 °C”, and GSSSD 6-89 “Tables of Standard Reference Data. Water. Dynamic viscosity coefficient at temperatures of 0...800 °C and pressures ranging from those corresponding to a rarefied gas to 300 MPa”, due to their use of outdated values for the dynamic and kinematic viscosity of water. The influence of reference viscosity values on the measurement capabilities of the Russian Federation is investigated. Data from key comparisons on viscosity conducted by the International Bureau of Weights and Measures, CCM.V-K4:2018, demonstrating the equivalence of laboratories, are presented. The obtained results contribute to improving the accuracy and consistency of viscosity measurements in the Russian Federation, which is crucial for ensuring measurement uniformity in industry and scientific research.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>вязкость воды</kwd><kwd>калибровка вискозиметров</kwd><kwd>метрологическое обеспечение</kwd><kwd>реологические измерения</kwd><kwd>step up method</kwd><kwd>ключевые сличения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>viscosity of water</kwd><kwd>viscometer calibration</kwd><kwd>metrological support</kwd><kwd>rheological measurements</kwd><kwd>step up method</kwd><kwd>key comparisons</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Schowalter W.R. 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