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Automated Measurement of Frequency Response of Frequency-Modulated Generators Using the Bessel Null Method

Description: From abstract: This paper describes a Bessel null technique to measure the frequency response of a frequency-modulated rf carrier and a program to automate frequency response measurements of signal generators with output frequencies from 0.450 to 2000 MHz. The measurements obtained using this technique are more precise than those obtained by a highly trained technician using a manual system.
Date: March 1986
Creator: Major, J. R.; Livingston, E. M. & Adair, Robert T.
Item Type: Refine your search to only Report
open access

Electrical Properties of Materials and Their Measurement at Low Temperatures

Description: Abstract: A review is given of the electrical resistance of materials at cryogenic temperatures. Measurement techniques, the data base, and uses of the data are presented. The emphasis is on metals and alloys of technological importance; a toxic which covers a large range of materials. Similarly, the treatment of theory and of measurement techniques is primarily for the user interested in the more practical aspects of the subject. In every instance, however, references are given which allow the… more
Date: March 1982
Creator: Fickett, F. R.
Item Type: Refine your search to only Report
open access

Energy Dispersive X-Ray Spectrometry

Description: Abstract: Energy-dispersive x-ray analysis with gas proportional detectors has been used widely in x-ray spectrochemical analysis. It was particularly useful in the detection of low-energy x-ray emission, before the commercial availability of the Blodgett-Langmuir pseudocrystals. With the development of solid-state x-ray detectors of high resolution, and improvement in associated electronics and computers, the interest in energy-dispersive x-ray analysis has increased enormously, to the point w… more
Date: March 1981
Creator: Heinrich, Kurt F. J.; Newbury, Dale E.; Myklebust, R. L. & Fiori, C. E.
Item Type: Refine your search to only Report
open access

Excitation of a TEM Cell by a Vertical Electric Hertzian Dipole

Description: From abstract: The excitation of a transverse electromagnetic (TEM) cell by a vertical electric Hertzian dipole is analyzed where the gap between the septum and side wall is assumed to be small. Approximate expressions for the field distribution and characteristic impedance are derived. These expressions are numerically evaluated for some typical geometries, and good agreement with previously published results is shown. The formation also allows a vertical offset for the septum position, thus o… more
Date: March 1981
Creator: Wilson, Perry F.; Chang, David C. & Ma, Mark T.
Item Type: Refine your search to only Report
open access

Possible Estimation Methodologies for Electromagnetic Field Distributions in Complex Environments

Description: Abstract: The problem of measuring and characterizing complicated multiple-source, multiple-frequency electromagnetic environments is becoming more important and more difficult as electrical devices proliferate. This paper outlines three general approaches to the problem which are currently under investigation at the National Bureau of Standards. The three approaches are: 1) a statistical treatment of the spatial distribution of electromagnetic field intensities, 2) a numerical computation usin… more
Date: March 1985
Creator: Kanda, Motohisa; Randa, J. & Nahman, N. S.
Item Type: Refine your search to only Report
open access

Standards Committee Activities of the National Bureau of Standards: 1980 Highlights

Description: From abstract: This report summarizes NBS standards committee activities during calendar year 1980. It contains highlights of significant technical and individual contributions made by NBS staff, a description of NBS standards management and information activities, and a directory of standards committees on which NBS staff serve. (Supersedes NBS Special Publication 573 (March 1980)).
Date: March 1980
Creator: Debelius, JoAnne R.
Item Type: Refine your search to only Report
open access

Standards Committee Activities of the National Bureau of Standards: 1982 Highlights

Description: Abstract: This report summarizes NBS standards committee activities and accomplishments during, calendar year 1982. It describes the management of standards activities at NBS, profiles NBS staf* participation on outside standards committees, and highlights significant technical and individual contributions made by NBS staff. In 1982, 457 staff members (or 29% of NBS' professional, scientific, and technical staff) participated in 1,046 outside standards committees of 97 national and internationa… more
Date: March 1983
Creator: Newell, Karl G., Jr.
Item Type: Refine your search to only Report
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