Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-11-24
1978-04-11
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 57SS, 324 58A, G01R 2700
Patent
active
040841324
ABSTRACT:
A method and apparatus for recording directly group delay measurement of a system under temperature and stress tests employing a modulated carrier frequency swept over an S or X-band of interest and applied through a reference path and a test path to separate detectors for group delay measurement using a power divider, e.g., a directional coupler or a hybrid-T junction. A phase comparator is initially balanced, and then the modulated carrier is swept in frequency over the band of interest for different conditions of temperature and/or mechanical stress to obtain a family of characteristic group-delay curves for the system under test.
REFERENCES:
patent: 2970258 (1961-01-01), Sinclair
patent: 3430139 (1969-02-01), Schluter
patent: 3437921 (1969-04-01), Custer, Jr.
patent: 3913011 (1975-10-01), Hughes et al.
Couder, Measuring Group Delay, IBM Technical Disclosure Bulletin, Aug. 1971, p. 894.
Fletcher James C. Administrator of the National Aeronautics and Space
Trowbridge David L.
Krawczewicz Stanley T.
Manning John R.
McCaul Paul F.
Mott Monte F.
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