A 20 kN·m torque standard machine has been designed and developed at National Institute of Metrology (NIM) since 2012. The torque standard machine adopts the lever-deadweight type, the air bearing with low friction is adopted to support the arm lever at the fulcrum, the invar alloy with the low expansion coefficient is used as the material of the arm lever, the weight suspension part and weight loading system are specially designed to ensure the force generated by the weights is applied accurately and reliably. 20 kN·m torque standard machine is capable of realizing the torque from 100 N·m to 24 kN·m both in clockwise and anti-clockwise direction. This paper introduces the mechanical structures and the electrical control system of the machine.

Axle weighing system measures axle weights of in-motion vehicles. Methods have been studied for estimating axle weights by processing the weight signal to improve the accuracy of measured axle weights. The examination of the accuracy of estimated axle weights of in-motion vehicles with higher velocity has not yet completed. To examine and improve the accuracy of the estimated axle weight, miniature models have been developed. The method have been applied to the obtained weight signals. This paper presents the developed miniature models and application results of the method.

A new torque calibration machine with a torque capacity of 5 kN·m has been installed in Force and Pressure Laboratory of GUM. This reference type machine generates torques in vertical axis in a range from 10 N·m to 5 kN·m with an expanded relative measurement uncertainty of 0,04 % (k = 2). Performance of the machine has been evaluated via comparison between GUM and PTB. Results of comparison measurement are presented.

This paper describes the constructional details of an FEM-supported construction of adaptation parts for a Build Up system up to 15 MN. After a short introduction about “Ukrmetrteststandard”, the NMI in Ukraine, several constructional details will be discussed which result in a very low measurement uncertainty. In addition, some experiences about the use of BU systems obtained during the evaluation will be presented.

Recent advance in flow metering of electrolytes through contactless method of Lorentz Force Velocimetry (LFV) demands application specific developments of high precision horizontal force measurement systems. In contrast to the measurand Lorentz force- directed horizontally and ranges as 10^-8 - 10^-5 N - there is 10 N vertically acting dead load accompanying measurements. In this work we present overview of two force measuring setups resolving these measurements particularly suitable for metering flow velocity of purely conducting liquids in channels. The first setup is based on principle of differential force measurements and uses two equivalent state-of-the-art electromagnetic force compensation (EMC) precision weighing balances in order to compensate mechanical vibrations and force drift. Measurement resolution of 20 - 30 nN in the range of up to 100 µN is achived. The second, optimized, setup demonstrates applicability of measurement method for the same horizontal forces based on direct EMC principle. The term ‘direct’ in last indicating the fact that in the setup EMC is done using magnetic field of high power magnet system. Magnets are required component of LFV setup and are suspended from force measuring setup producing 10 N unavoidable dead load.