Lal, Tripurari and Mandal, Goutam and Gopan, C. K. (2008) Re-establishment of National Standards of Mass at NPL India. MAPAN-JOURNAL OF METROLOGY SOCIETY OF INDIA , 23 (3). pp. 139-158. ISSN 0970-3950

PDF - Published Version Restricted to Registered users only Download (204Kb) | Request a copy

Abstract

The National Physical Laboratory New Delhi (NPLI) discharges the responsibility of realizing and establishing the national standards of mass through the national prototype kilogram, copy no. 57 of the international prototype of the kilogram. The standards of mass, in India, is established by NPLI, through calibration of four 1-kg transfer standards of mass against the national prototype kilogram and then calibrating multiples and sub-multiples of 1 kilogram against the transfer standards with best possible measurement capabilities. The measurement capability depends upon the accuracy of the standards, measurement procedure, measuring instruments used, well controlled environmental conditions and skills of the operator involved in the measurement process. Recently a new 1 kg mass comparator has been installed in mass metrology laboratory of NPLI . Using this mass comparator the transfer standards have been re-calibrated against the national prototype kilogram with improved measurement uncertainty of 28 μg against 40 μg with k=2. With new values of the transfer standards, multiples and sub-multiples of 1 kg have been recalibrated resulting better measurement uncertainties. This paper describes re-establishing the national standards of mass with in the range of 1 mg to 10 kg. The mass standards, weighing instruments and weighing schemes used for the comparisons, calculations for mass and conventional mass and associated uncertainties for all weights of the entire range, have also been described.

Item Type:	Article
Subjects:	Metallurgy & Metallurgical Engineering Meteorology & Atmospheric Sciences Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	17 Mar 2017 07:32
Last Modified:	17 Mar 2017 07:32
URI:	http://npl.csircentral.net/id/eprint/2076

Actions (login required)

View Item