Uncertainty in the Calibration of Coaxal Thermal Noise Sources using a Noise Figure Measuring Equipment

  • Kang, Tae-Weon (Korea Research Institute of Standards and Science, Division of Electromagnetic Metrology, Electromagnetics Group) ;
  • Kim, Jeong-Hwan (Korea Research Institute of Standards and Science, Division of Electromagnetic Metrology, Electromagnetics Grou) ;
  • Park, Jeong-Il (Korea Research Institute of Standards and Science, Division of Electromagnetic Metrolog, Electromagnetics Group)
  • Published : 2004.06.01

Abstract

In this paper, the uncertainty in the calibration of coaxial thermal noise sources using a noise figure measuring (NFM) equipment is evaluated. Contributions to the uncertainty such as the calibration uncertainty of the standard noise source, mismatch, measurement of adapter efficiency, ambient temperature variation, and repeatability are evaluated in the frequency range of 10 MHz to 18 ㎓. Results show that the expanded uncertainty(k=2) is 0.23 ㏈ for the noise sources of 5 ㏈ and 15 ㏈ ENR, and 0.27 ㏈ for those of 21 ㏈.

References

  1. Application Note 57-1: Fundamentals of RF and Microwave Noise Figure Measurements
  2. Operation manual, Noise Figure Measurement Operation for the HP 8970B, HP 8971B and HP 8971C
  3. IEEE Trans. Microwave Theory Tech. v.16 no.9 The effect of mismatched components on microwave noise-temperature calibrations T. Y. Otoshi https://doi.org/10.1109/TMTT.1968.1126771
  4. ISO: Guide to the Expression of Uncertainty in Measurement International Organization for Standardization
  5. KRISS Guide ot the Expression of Uncertainty in Measurement N. S. Chung(et al.)
  6. KRISS-89-18-IR Electromagnetic Noise Temperature Standards B. K. Park(et al.)
  7. Proceedings of the IEEE v.55 no.6 Noise standards, measurements, and receiver noise definitions C. K. S. Miller;W. C. Daywitt;M. G. Arther https://doi.org/10.1109/PROC.1967.5700
  8. Application Note 57-2: Noise Figure Measurement Accuracy-The Y-Factor Method