The alignment measurements of material testing machines can be made according to ASTM E1012 and ISO 23788 standards. These standards provide information on alignment devices, alignment measurement, and post-measurement calculations. However, they can't make a definition for the calibration of the alignment measuring device. For this purpose, this article has been prepared as a recommendation for the calibration method of the alignment measuring devices and the evaluation after the measurements. In this study, the calibration method of the alignment measuring device is defined and the calculations are given clearly with two different numerical examples.

This paper focuses on an analysis of behaviour of a dynamic mass measurement system. The goal of this paper is to propose a dynamic model of the system, which can reproduce dynamic behaviour to floor vibration. The dynamics of our system with electro-magnetic force compensation is approximated by a mass-spring-damper system, and an equation of motion is obtained. Model parameters are also estimated from experimental data. Then, comparisons of the proposed model with the previous model are carried out, and the effectiveness is also confirmed.

On 20 May 2019 a new definition of the SI unit of mass, the kilogram, came into force. The kilogram is now defined based on a fixed numerical value of the Planck constant. This leads to a new situation for mass metrology that in principle every National Metrology Institute can realise the kilogram. To ensure global uniformity, the Consultative Committee for Mass and Related Quantities (CCM) recommended that during an initial phase the dissemination of the kilogram shall be internationally coordinated, by basing it on a so-called ‘Consensus Value’. This paper describes the different phases of the dissemination of the kilogram, the determination of the Consensus Value and its impact on national mass scales. The paper concludes with an outlook on future developments of kilogram realisation and dissemination techniques.

In high-resolution investigations of bridge amplifiers, researchers at PTB using cascaded inductive voltage dividers recently detected a fine sawtooth structure in the characteristic curves of certain amplifier types. These results have now been confirmed using simple mechanical means. For many laboratories, the easy availability of the method presented here opens up the possibility of independently estimating the extent of the measurement uncertainty contributions caused by the sawtooth structure.

Quantum-based methods have the potential to become primary standards for the SI unit of pressure, the pascal. Some of these standards are based on the determination of the refractive index of a gas under different pressure conditions by Fabry-Perot (FP)-based refractrometry methods. These methods depend on the control of other quantities, mainly the temperature and the mechanical stability. Ideally, the use of an improved cavity with piezo-electric and elasto-optic characteristics will allow for a novel and improved control of the effects of these parameters.