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<p>A coaxial twin resistor thermistor mount has been realized as a national standard of RF Voltage at CSIR-National Physical Laboratory, India (NPLI). In electrical metrology, particularly in radio frequency (RF) metrology, radio-frequency (RF) voltage is an important parameter. Metrological accuracy in RF power measurements is critical for various scientific and industrial applications, including telecommunications, medical devices, and radar systems. This paper presents measurement data for the validation of the RF Voltage primary standard at CSIR-National Physical Laboratory, India (NPLI) i.e. twin resistance coaxial power mount power sensor with 50&#xa0;Ω type N connector which has been carried out between Physikalisch-Technische Bundesanstalt (PTB Germany) and NPLI in the frequency range of 1–1000&#xa0;MHz. The measurements were carried out at PTB Germany in 2022 and at NPLI in 2021 and 2024. The RF Voltage probe which is having a 50&#xa0;Ω type N connector, is based on the power substitution technique, where the heating effect produced by RF power is compared with the equivalent DC power. The RF Voltage primary standard has been assigned the RF–DC transfer difference from 1 to 1000&#xa0;MHz. The RF–DC transfer difference values assigned by NPLI and PTB show good agreement across the investigated frequency range. The RF–DC transfer differences evaluated between the two laboratories remain within the associated expanded measurement uncertainties.</p>

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Validation of NPLI RF Voltage Primary Standard with PTB Germany

  • 期刊论文

  • 发表日期：

    2026年4月6日

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  • Avni Khatkar,
  • Archana Sahu,
  • Swati Kumari,
  • Sunidhi Luthra,
  • Saood Ahmad

摘要

A coaxial twin resistor thermistor mount has been realized as a national standard of RF Voltage at CSIR-National Physical Laboratory, India (NPLI). In electrical metrology, particularly in radio frequency (RF) metrology, radio-frequency (RF) voltage is an important parameter. Metrological accuracy in RF power measurements is critical for various scientific and industrial applications, including telecommunications, medical devices, and radar systems. This paper presents measurement data for the validation of the RF Voltage primary standard at CSIR-National Physical Laboratory, India (NPLI) i.e. twin resistance coaxial power mount power sensor with 50 Ω type N connector which has been carried out between Physikalisch-Technische Bundesanstalt (PTB Germany) and NPLI in the frequency range of 1–1000 MHz. The measurements were carried out at PTB Germany in 2022 and at NPLI in 2021 and 2024. The RF Voltage probe which is having a 50 Ω type N connector, is based on the power substitution technique, where the heating effect produced by RF power is compared with the equivalent DC power. The RF Voltage primary standard has been assigned the RF–DC transfer difference from 1 to 1000 MHz. The RF–DC transfer difference values assigned by NPLI and PTB show good agreement across the investigated frequency range. The RF–DC transfer differences evaluated between the two laboratories remain within the associated expanded measurement uncertainties.