Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-05-19
1976-08-17
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 79D, G01R 2922, G01R 2302
Patent
active
039756785
ABSTRACT:
Apparatus for ascertaining that the resonant frequency of a crystal frequency determining element lies within a predetermined frequency range is disclosed. A crystal whose frequency is to be measured is connected to an oscillator which provides vertical and horizontal deflection signals to a cathode ray tube device. Two crystal controlled signal generators provide series of short duration output impulses which are applied to the control grid of the cathode ray tube. One oscillator operates at the upper frequency limit of the frequency range, and the other oscillator operates at the lower frequency limit. If the crystal undergoing tests lies between the two frequencies of the two reference generators, two spots appearing on the screen of the cathode ray tube will rotate countercurrent with one another. If the frequency of the crystal undergoing test lies outside of the frequency range fixed by the two signal generators, those spots will rotate in the same direction, either clockwise or counterclockwise, depending upon whether the frequency of the crystal lies above or below the desired range.
REFERENCES:
patent: 2411298 (1946-11-01), Shore
patent: 2476954 (1949-07-01), Blackburn
patent: 3207995 (1965-09-01), Beer et al.
patent: 3530377 (1970-09-01), Tanzman
patent: 3840804 (1974-10-01), Sauerland
patent: 3861266 (1975-01-01), Whitaker
Terman et al., Electronic Measurements McGraw-Hill, Second Edition, 1952, Sec. 5-7, pp. 215-220.
American Micro-Systems, Inc.
Strecker Gerard R.
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