| Uncertainty in the Calibration of Coaxal Thermal Noise Sources using a Noise Figure Measuring Equipment |
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Tae-Weon Kang1, Jeong-Hwan Kim2, Jeong-Il Park3 |
1Korea Research Institute of Standards and Science, Division of Electromagnetic Metrology, Electromagnetics Group
2Korea Research Institute of Standards and Science, Division of Electromagnetic Metrology, Electromagnetics Grou
3Korea Research Institute of Standards and Science, Division of Electromagnetic Metrolog, Electromagnetics Group |
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| Abstract |
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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 ㏈. |
| Key words:
Excess Noise Ratio, Noise Temperature, Coaxial Thermal Noise Source, Uncertainty |
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