CHARACTERIZATION OF DEAD WEIGHT TESTERS AND COMPUTATION OF ASSOCIATED UNCERTAINTIES: A CASE STUDY OF CONTEMPORARY TECHNIQUES<br />
Journal Title: Metrology and Measurement Systems - Year 2007, Vol 14, Issue 3
Abstract
Estimation of uncertainty associated with pressure, measured by a dead weight tester is a key issue of recent times in pressure metrology. Though two different techniques have been used in the past yet there has been little uniformity in the way in which the measurement uncertainties of dead weight piston testers are evaluated and expressed. One of the techniques described in EAL document follows the universal approach based on ISO Guide and the relatively recent approach described in the National Accreditation Board of Laboratories (NABL-141) document presents a method for evaluating uncertainty in pressure measurement using dead weight testers through statistical analysis and error evaluated through linear curve fitting. This method is though in line with ISO Guide on the expression of uncertainty in measurement but differs from the traditional uncertainty measurement computations. The present paper describes a comparative study of these two different approaches through a case study carried out on an industrial dual range simple type dead weight tester. The paper also highlights some of the facts: how the new estimates affect pressure measurement and their commercial implementation and the benefits over traditional estimates.
Authors and Affiliations
SANJAY YADAV
Keywords
Related Articles
- EP ID EP96830
- DOI -
- Views 58
- Downloads 0
OPTICAL VORTICES AS PHASE MARKERS TO WAVE-FRONT DEFORMATION MEASUREMENT
n this paper a new method to the test deformation of the wave-front of the plane wave is presented. In the method Optical Vortex Interferometry is applied. In the OVI a regular lattice of optical vortices is generated by...
NTERCOMPARISON OF WATER TRIPLE POINT CELLS FROM INTIBS AND INRIM
The triple point of water defines the unit of thermodynamic temperature, kelvin, and is the most important fixed point of the International Temperature Scale of 1990. Several international comparisons of cells for the re...
ELIMINATION OF NONLINEARITY WITH DISCONTINUITIES (OF THE DEAD ZONE) FROM STATIC CHARACTERISTIC OF CONVERTER
The characteristics of real converters, including sensors, are - to a smaller or larger extent - nonlinear. Nonlinearity may result from the technologies applied to produce the converter or from the type of processing to...
MEASUREMENT METHOD OF SHAPE DEVIATION OF CYLINDRICAL MICRO-LENSES USING FOCUSED LASER BEAM AND REFERENCE AXIS<br />
Constant progress in application of micro-lenses in many modern optical systems caused a continuous increase of the need to investigate methods of their measurement. A new method of measurement of shape deviation of such...
IMAGE PROCESSING SYSTEM PROPOSED TO BE APPLIED IN A GASTROSCOPIC LABORATORY
The article presents a way to integrate an endoscope with computer equipment. Software has been proposed to archive and access results of endoscopic tests. The data can be accessed at the hospital area and from outside i...