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Title: A Revised Uncertainty Analysis For The NIST 30-MHZ Attenuation Calibration System
Author: Jeffrey A. Jargon
Source: 1994 Measurement Science Conference
Year Published: 1994
Abstract: Although the 30.MHz Attenuation Calibration System has been in operation for many years at the National Institute of Standards and Technology, several modifications have been made to the system since the last published uncertainty analysis. The linear displacement of the standard attenuators receiving coil is now measured with a laser interferometer instead of a steel ruled scale and optical projector, and a new comparison receiver has been installed in the system. The expanded uncertainty is on the order of & 0.003 dB per 10 dB step. Type A uncertainties depend upon the repeatability and resettability of the system and the device under test. Type B uncertainties are due to the standard waveguide below-cutoff (WBCO) attenuator, the resolution of the comparison receiver, the change in level of the precision phase shift standard, the level set attenuator, rf leakage, and mismatch uncertainty

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