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<p>This review paper summaries the realization and updating of national standards of capacitance at CSIR-NPL. The capacitance standards maintained at CSIR-NPL are ranging from 10 pF to 1 mF with an uncertainty of 0.04&#xa0;ppm to 300&#xa0;ppm at 1&#xa0;kHz. The capacitance measurement capabilities had been enhanced up to 30&#xa0;MHz frequency with coaxial airlines and 4TP capacitance standards. The traceability links of various type of capacitance standards like fused silica, air, mica, 4TP, transformer coupled high value capacitance, coaxial airlines are discussed in brief. This paper also summaries the competency of capacitance Calibration and Measurement Capabilities (CMCs) of NPL India, with other NMIs in terms of international intercomparisons.</p>

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Evolution of national standards of capacitances at CSIR-NPL over the last 50 years

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Priyanka Jain,
  • Sachin Kumar,
  • Jyotsana Mandal,
  • Satish,
  • Nidhi Singh,
  • J. C. Biswas

摘要

This review paper summaries the realization and updating of national standards of capacitance at CSIR-NPL. The capacitance standards maintained at CSIR-NPL are ranging from 10 pF to 1 mF with an uncertainty of 0.04 ppm to 300 ppm at 1 kHz. The capacitance measurement capabilities had been enhanced up to 30 MHz frequency with coaxial airlines and 4TP capacitance standards. The traceability links of various type of capacitance standards like fused silica, air, mica, 4TP, transformer coupled high value capacitance, coaxial airlines are discussed in brief. This paper also summaries the competency of capacitance Calibration and Measurement Capabilities (CMCs) of NPL India, with other NMIs in terms of international intercomparisons.