Re-establishment of National Standards of Mass at NPL India
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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Title |
Re-establishment of National Standards of Mass at NPL India
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Creator |
Lal, Tripurari
Mandal, Goutam Gopan, C. K. |
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Subject |
Metallurgy & Metallurgical Engineering
Meteorology & Atmospheric Sciences Physics |
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Description |
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.
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Publisher |
Metrology Society of India
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Date |
2008
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Type |
Article
PeerReviewed |
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Format |
application/pdf
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Identifier |
http://npl.csircentral.net/2076/1/221.pdf
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 |
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Relation |
http://npl.csircentral.net/2076/
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