V. Sedlák, D. Pražák, J. Tesař, D. Rosu, G. Geršak, M. Ferreira, M. Nawotka, A. Bosnjakovic, E. Jugo, P. Hetherington, A. Duffy, P. Pavlásek
EVALUATION OF SPHYGMOMANOMETERS USING AN ADVANCED OSCILLOMETRIC SIGNAL GENERATOR

Reliable and accurate blood pressure measurements using sphygmomanometers are indispensable in the diagnostic and treatment of hypertension. Unfortunately, testing of performance and accuracy of automated oscillometric sphygmomanometers is complicated, lengthy and expensive. Fact that the oscillometric sphygmomanometers are majority of the blood pressure measuring devices on today’s market makes the problem more pressing. EMPIR project adOSSIG built a physiologybased advanced blood pressure simulator with a goal of improving blood pressure measurements. This paper describes results of testing of sphygmomanometers using this newly developed simulator.

Kenan Varda, Almira Softić, Nermina Zaimović-Uzunović, Ernad Bešlagić
COMPARISON OF DIMENSIONS, SHAPES AND POSITIONS CONTROL USING CMM AND 3D SCANNER

In this paper, measurements on stainless steel AISI 304 workpiece using Coordinate measuring machine Carl Zeiss Contura G2 and 3D scanner RangeVision PRO are compared and analyzed. Dimensional control is conducted by measuring 11 faces and 9 cylinders. Length, diameter, cylindricity, flatness and parallelism are controlled for features of interest. Using Calypso software on CMM and GOM Inspect software for 3D scanned model are used for creating virtual measurement strategies and dimensional and GD&T control. Deviations of measuring results using both measuring systems are shown and conclusions and recommendations for dimensional control are listed in tables.

A. Savarin, A. Chijioke
MEASUREMENT OF DYNAMIC ROCKING IN SINUSOIDAL CALIBRATION WITH AN ELECTRODYNAMIC SHAKER

Rocking motion is often a significant source of uncertainty in sinusoidal calibrations of accelerometers and force transducers. We describe real-time measurements of rocking during sinusoidal excitation, performed at NIST. The measurement is contactless and can be performed simultaneously with the motion. We report rocking measurements for excitation frequencies up to 2 kHz. The results obtained have an absolute uncertainty (k = 2) in the range of 0.02 µrad to 3.3 µrad and allow error due to rocking motion to be largely corrected in axial acceleration measurement.

Andreas Havreland
ELECTRICAL IMPEDANCE BASED CALIBRATION OF ACCELEROMETERS

This contribution proposes a methodology to predict the transfer function of an accelerometer solely based on an electrical impedance measurement. Such impedance measurement can be conducted in-situ and has certain advantages for some types of accelerometers and under certain measuring conditions. A proof-of-concept study has been conducted where the methodology is used to estimate the sensitivity at 160 Hz, the proposed method underestimates the sensitivity by 9% compared to a conventional vibration experiment.

J. Berry, P. Lovelock, I. A. Robinson, J. Urquhart
VIBRATIONAL ANALYSIS FOR THE NEXT GENERATION NPL KIBBLE BALANCE

Low uncertainty Kibble balance measurements require careful consideration of the effect of external sources of vibration. This paper compares vibrational modelling of the machine frame of the National Physical Laboratory’s next generation Kibble balance using three different software packages. The output of the modelling on the machine frame showed that the first modes of vibration were all above the design requirement of 60 Hz.
The model was then enhanced to include the moving section of the balance modelled with two types of guidance mechanism. The output from the modelling showed a reduction in the resilience of the balance to lateral vibrations but the linkage type guidance mechanism was still resilient to induced vibrations at frequencies up to 50 Hz.