GET 149-2023 state primary standard of the unit for torque

The article considers issues associated with the metrological support of high-precision instruments for measuring a torque of below 1.0 Nm. The areas of activity in which torque measurement is important are outlined. The authors describe the development history of the top-level standards base as an important element in the metrological support of torque measurement in the Russian Federation while providing brief information on the development level of the standards base in this measurement field abroad. Due to the increasing number of torque measuring instruments having an upper measurement limit of below 1.0 Nm, it became necessary to expand the measurement and calibration capabilities of the Russian Federation in this field, specifically within the range of 0.1–1.0 Nm. The composition of GET 149-2023 State primary standard of the unit for torque is given. The operating principles of four standard systems included in GET 149-2023 and the design of the standard are described. The created modern standard system EU-250‑2 was included in GET 149-2023 for reproducing, maintaining, and disseminating the unit for torque within the range of 0.1–200 Nm. The results of studying the standard system EU-250‑2 and the metrological characteristics of GET 149-2023 are presented.