A.Capelli, G.D’Agostino, S.Desogus, A.Germak, C. Origlia, D. Quagliotti
A TRANSPORTABLE ABSOLUTE GRAVITY METER ADOPTING THE SYMMETRIC RISE AND FALLING METHOD

The Gravimetry Group of the Institute of Metrology “G. Colonnetti” (IMGC-CNR), nowadays National Institute of Research in Metrology (INRIM), developed a new version of a transportable absolute gravimeter, the IMGC-02. The instrument presents several improvements mainly concerning the transportability, the measurement automation and the user-interface programs. According to the ISO-GUM (Guide to the Expression of Uncertainty in Measurements), an extensive analysis concerning the contributors to the uncertainty budget has been conducted. At present the instrumental expanded uncertainty (p = 95%) is believed to be about 8 parts in 10⁹ of the surface gravity value. The detailed description of the IMGC-02 apparatus and an outline of its metrological characterization is the subject of this paper.

Dirk Röske, Dietmar Mauersberger
ON THE STABILITY OF MEASURING DEVICES FOR TORQUE KEY COMPARISONS

Key comparisons are an important approach for the national metrological institutes to ensure that the units of the different physical, chemical and other quantities are realized and disseminated according to the stated uncertainties. In May 2005, the first world-wide CIPM torque key comparison (CCM.T-K1) has been started. The main purpose of this paper is to compare the stability of the torque standard machine, the travelling standard (torque transfer standard) and the amplifier DMP40 of the pilot laboratory with the combination of the bridge standard BN100 and the same amplifier.

Barry Pratt, Andy Robinson
A COMPARISON BETWEEN SUPPORTED AND UNSUPPORTED BEAMS FOR USE IN STATIC TORQUE CALIBRATIONS

In industry, calibration beams are frequently coupled directly to the measurement transducer. This paper aims to quantify the effect of using such a method in contrast to the bearing supported case for a range of commercially available transducers.

Ricardo Luís da Rocha Carmona, Sílvio Fazolli, Milton Pereira
MENIR – A CONTRIBUTION FOR FINAL UNCERTANTY EVALUATION OF ROCKETS MASS MEASUREMENTS

The weight is a very significant property for several rocket projects’ calculations. The cost of satellite mass is very high and a reduction of 1% can save thousands of dollars. Then it’s necessary to know the most important uncertainty sources to obtain a reliable result. In this paper, a developed method is shown to find the smaller uncertainty of a rocket’s weight among several available weighing instrument parks.

Edi Kulderknup, Viktor Krutob, Jürgen Riim
UNCERTAINTY OF BRAKING PARAMETERS MEASUREMENTS BY VEHICLES TECHNICAL INSPECTION

Nowadays more widely is taken to use the road vehicles periodical inspection with aim to have knowledge of the technical level of item and to assure the safety. To have the assured right inspection results there shall be used various testing and measurement procedures. Among of the important are measurements of the parameters showing the road vehicles brakes correct operation. To give proper conformity estimation to the vehicles brakes operation shall be used uncertainty of measurement result. To give more confidence to the estimated uncertainty components suitable way is to carry out measurement comparisons of brakes parameters.