Abstract
National Physical Laboratory (NPLI) India is the premier research and development center and the National Metrology Institute, which provides traceability in measurements by calibration throughout the country. Microwave power is one of the important parameter in electrical metrology. The coaxial microcalorimeter at NPLI is being used as the primary standard of microwave power from 10 MHz to 18 GHz. The standards for low frequency (LF) voltage are established by assigning AC–DC transfer difference to multijunction thermal voltage converters. The range of frequency of these standards is from 10 Hz to 1 MHz at NPLI. The measurement results, below 10 MHz by calorimetric technique are not reliable. Hence, there is a need for LF power standard at 1 MHz, which has been realized using twin resistance coaxial power mount traceable to LF voltage standard. In this paper a description of measurement technique, traceability, calibration results along with uncertainty has been explained.
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S. Ahmad, R. Aggarwal, B. Pal, A.K. Govil and P. Banerjee, Validation of RF power standard in the frequency range of 100 MHz to 18 GHz by an interlaboratory data comparison, MAPAN-J. Metrol. Soc. India, 24(4) (2009) 247–253.
S. Ahmad, V.K Rustagi, A.K. Govil, R. Aggarwal, B. Pal and P.C Kothari, Study of the long term performance on the calibration data of the coaxial thermistor mounts up to 18 GHz, MAPAN-J. Metrol. Soc. India, 23(2) (2008) 71–78.
A. Fantom, Radio frequency and microwave power measurement, Peter Peergrinus, London, part D 16 (1990) 258–263.
F.L. Hermach, J.R. Kinard, and J.R. Hastings, Multijunction thermal converters as the NBS primary AC–DC transfer standards for AC current and voltage measurements, IEEE Trans. Instrum. Meas., IM-36(2) (1987) 300–306.
M. Halawa, A. Hasan, E.H. Shehab-Eldin and E.M. El-Refaee, Integrated calibration system for accurate AC current measurements up to 100 kHz, MAPAN-J. Metrol. Soc. India, 27(3) (2012) 143–148.
H. Bayer and D. Janik, International comparison of voltage (1V) in coaxial line at frequencies up to 1 GHz, Metrologia, 20 (1984) 115–126.
S. Ahmad, B. Pal, P.S. Negi and A.K Bandyopadhyay, Assigning RF/DC transfer difference to high voltage primary standard up to 1 GHz at NPLI, MAPAN-J. Metrol. Soc. India, 28(2) (2013) 113–117.
J.R. Kinard and T.X. Cai, Determination of AC–DC difference in the 0.1–100 MHz frequency range, IEEE Trans. Instrum. Meas., 38 (1989) 360–367.
B. Pal, A. Kumar, S. Madaan, S. Ahmad and A.K. Govil, Establishment of traceability for strain measuring data acquisition system in terms of voltage, MAPAN-J. Metrol. Soc. India, 25(2) (2010) 125–128.
B. Pal, S. Ahmad and A.K. Govil, Automation and evaluation of two different techniques to calibrate precision calibrators for low frequency voltage using thermal devices, MAPAN-J. Metrol. Soc. India, 28(1) (2013) 31–36.
M. Solaguren-Beascoa Fernández, V. Ortega López, R. Serrano López, On the uncertainty evaluation for repeated measurements, MAPAN-J. Metrol. Soc. India, 29(1) (2014) 19–28.
Guidelines for Evaluation of the Uncertainty of Measurement in Calibration, European Co-operation for Accreditation Document No. EA-4/02, October 2013.
Acknowledgments
The authors would like to thank Prof. R C Budhani, Director NPLI for his encouragement and permission to publish this work. We also like to thank all the authors whose published work has been referred to in this paper.
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Ahmad, S., Pal, B., Negi, P.S. et al. Realization of Low Frequency Power Standard at NPLI. MAPAN 29, 285–288 (2014). https://doi.org/10.1007/s12647-014-0111-3
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DOI: https://doi.org/10.1007/s12647-014-0111-3