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|Author(s):||James P. Randa;|
|Title:||Uncertainties in NIST Noise-Temperature Measurements|
|Published:||March 01, 1998|
|Abstract:||Uncertainty analyses are presented for NIST measurements of noise temperature. All systems currently used in NIST calibrations of thermal-noise sources are treated. These include tuned systems for 30 and 60 MHz, coaxial total-power radiometers for 1 to 12 GHz, a switching radiometer for the WR-90 (8.2 to 12.4 GHz) waveguide band, and total power waveguide radiometers for the WR-62 (12.4 to 18 GHz), WR-42 (18 to 26.5 GHz), WR-28 (26.5 to 40 GHz), and WR-15 (50 to 75 GHz) bands. Measurements through adapters are also analyzed. Typical expanded (k = 2) uncertainties for the measurements are in the range 0.7 percent to 1.4 percent, depending on the particular system and the frequency.|
|Citation:||Technical Note (NIST TN) - 1502|
|Keywords:||noise,noise measurement,noise temperature,thermal noise,uncertainty analysis|
|Research Areas:||Electronics & Telecommunications, Microwave Measurement Services, Electromagnetics|
|PDF version:||Click here to retrieve PDF version of paper (2MB)|