منابع مشابه
Mechanical , Sensor and Control System Design for an Accelerometer Calibrator with One Part Per Million Accuracy
This thesis presents the design and implementation of a low frequency accelerometer calibrator that will be used to calibrate United States Primary Standard Transducers at the U.S. National Bureau of Standards, Gaithersburg Maryland. Accelerometers convert a rate of change of velocity into a measurable quantity, typically voltage, and must be calibrated to find their sensitivity as the ratio of...
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........................................................................................................................................................ 5 Table of Figures ............................................................................................................................................ 6 Table of Tables .....................................................................
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The photometric errors of the external calibrator for the FIRAS instrument on the COBE are smaller than the measurement errors on the cosmic microwave background (CMBR) spectrum (typically 0.02 MJy/sr, 1 σ), and smaller than 0.01% of the peak brightness of the CMBR. The calibrator is a re-entrant cone, shaped like a trumpet mute, made of Eccosorb iron-loaded epoxy. It fills the entire beam of t...
متن کاملA New Partial Discharge Measuring System Calibrator
A new PD (partial discharge) measuring system calibrator is described. The device, battery operated, may be used either grounded or in a floating position, and generates securely mains-synchronized impulses by capacitive coupling. It allows the determination of the scale factor k and resolution time Tr in PD measuring systems, and it fulfils the requirements of International Standard IEC 60270....
متن کاملThe Third Vlba Calibrator Survey — Vcs3
This paper presents the third extension to the Very Large Baseline Array (VLBA) Calibrator Survey, containing 360 new sources not previously observed with very long baseline interferometry (VLBI). The survey, based on three 24 hour VLBA observing sessions, fills the areas on the sky above declination −45 where the calibrator density is less than one source within a 4 radius disk at any given di...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1958
ISSN: 0001-4966
DOI: 10.1121/1.1930028