Title :
A simple noise calibration radiometer
Author_Institution :
Nat. Inst. of Stand. & Technol., Boulder, CO, USA
Abstract :
A relatively inexpensive radiometer intended to serve the needs of a calibration laboratory with a moderate workload is presented. It utilizes heterodyning for broad frequency coverage and a precision waveguide-below-cutoff attenuator to achieve a null-balancing mode of operation. The overall accuracy (with a primary cryogenic standard attached) is about 2%. Due to cost constraints, the radiometer is relatively slow and relies on a separate vector network analyzer to measure the reflection coefficients.<>
Keywords :
calibration; electric noise measurement; measurement standards; radiometers; thermal noise; NIST; calibration laboratory; heterodyning; noise calibration radiometer; null-balancing mode; primary cryogenic standard; reflection coefficients; thermal noise; vector network analyzer; waveguide-below-cutoff attenuator; Calibration; Circuit noise; Circuit testing; NIST; Noise generators; Noise measurement; Power generation; Radio frequency; Radiometry; Temperature;
Conference_Titel :
Precision Electromagnetic Measurements, 1990. CPEM '90 Digest., Conference on
Conference_Location :
Ottawa, Ontario, Canada
DOI :
10.1109/CPEM.1990.109910
