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High Power CW Wattmeter Calibration at NIST.

Gregorio Rebuldela1, Jeffrey A Jargon1

  • 1National Institute of Standards and Technology, Boulder, CO 80303.

Journal of Research of the National Institute of Standards and Technology
|January 6, 2017
PubMed
Summary

The National Institute of Standards and Technology developed an automated system for high-power wattmeter calibration up to 1000 W. This system uses a cascaded coupler technique traceable to a 10 mW standard for accurate measurements.

Keywords:
automatedcalibrationcascadedcontinuous wavecouplerhigh powermeasurementtransferuncertaintywattmeter

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Area of Science:

  • Electrical Engineering
  • Metrology
  • Radio Frequency Engineering

Background:

  • Accurate calibration of high-power wattmeters is crucial for radio frequency (RF) systems.
  • Existing calibration methods may have limitations at higher power levels and frequencies.
  • The National Institute of Standards and Technology (NIST) supports advancements in high-power measurement capabilities.

Purpose of the Study:

  • To establish a traceable measurement capability for high-power wattmeters.
  • To develop and validate an automated calibration system for wattmeters.
  • To extend accurate power measurements to higher levels (up to 1000 W) and frequencies (up to 400 MHz).

Main Methods:

  • Utilized a cascaded coupler technique with nominal 10, 20, 30, 40, and 50 dB couplers.
  • Employed an automated system with sidearm power meters for sequential calibration transfers.
  • Calibrated the system traceability to a 10 mW standard thermistor mount.
  • Incorporated corrections for nonlinearities, mismatch, and other non-ideal component errors.

Main Results:

  • Successfully established a measurement capability for wattmeters from 1 to 1000 W (1-30 MHz) and 1 to 500 W (30-400 MHz).
  • Demonstrated the effectiveness of the cascaded coupler technique for extending power measurements.
  • Evaluated two types of wattmeters at selected frequencies and power levels.
  • Quantified total uncertainties based on random and systematic components.

Conclusions:

  • The automated wattmeter calibration system provides a reliable method for high-power measurements.
  • The cascaded coupler technique ensures traceability and accuracy in RF power calibration.
  • NIST's capability supports the development and validation of high-power RF devices and systems.