IMPROVEMENT OF MEASUREMENT CAPABILITIES OF MULTIPLE MASS STANDARDS OF 1 kg AT NPLI |
|---|
| Goutam Mandal, C. K. Gopan |
- Abstract:
- The National Physical Laboratory, India (NPLI) is the custodian of National Prototype of the Kilogram (NPK) No. 57, which was provided by the International Bureau of Weights and Measures (BIPM), Paris, France in 1958 after its first calibration in 1955. The NPK has been recalibrated three times (1985, 1992 & 2002) so far at the BIPM. All NPL working standards (Multiples & sub-multiples of 1 kg) range from 1 mg to 20 kg are reestablished using new value of NPK through four Transfer Standards of 1 kg (two made of Stainless steel and two made of Nickel-Chromium alloy) according to defined periodicity.
The calibration of multiples of 1 kg is carried out using a fully automatic mass comparator with maximum capacity of 64 kg and resolution of 0.1 mg. Using this mass comparator, we have improved our calibration and measurement capabilities (CMCs) from 0.6 mg to 0.2 mg (k = 2) in 2 kg, from 1.5 mg to 0.3 mg (k = 2) in 5 kg, from 3 mg to 0.5 mg (k = 2) in 10 kg and from 6 mg to 1.0 mg (k = 2) in 20 kg. The details of measurement technique and results of multiples of 1 kg are discussed in this paper. - Keywords:
- subdivision and substitution method
- Download:
- IMEKO-TC3-2010-021.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC3
- Event name:
- TC3 Conference 2010
- Title:
21st Conference on Measurement of Force, Mass and Torque (together with TC5 HARDMEKO 2010 and 2nd TC22 Meeting on Vibration Measurement)
- Place:
- Pattaya, THAILAND
- Time:
- 21 November 2010 - 25 November 2010