Accession Number : AD0263537

Title :   A METHOD FOR OBTAINING EXTREMELY ACCURATE CATHODE-RAY-TUBE SWEEPS

Corporate Author : MICHIGAN UNIV ANN ARBOR INST OF SCIENCE AND TECHNOLOGY

Personal Author(s) : CAMPBELL,JOHN D.

Report Date : SEP 1961

Pagination or Media Count : 1

Abstract : A method is described of obtaining very accurate, linear, CRT (cathode-ray-tube) sweeps. Sweep accuracies approximately 100 times better than those obtainable by conventional techniques are possible. The technique is best applied to unmodulated CRT sweeps; however, it may also be applied to amplitude-modulated sweeps and, under special conditions, to intensity-modulated sweeps. A feedback control loop is used. A linear second-order model system is developed and analyzed, in generalized terms, for three simple input-error functions: a step, a ramp, and a sinusoid. From these results an idealdesign approach is developed, and the limitations of this approach are indicated. Other design approaches are discussed briefly. Some special design considerations are discussed and other possible applications of the technique are mentioned. A sample calculation of the major parameters of a specific system is included as well as some experimental data and results obtained from a crude breadboard model. The experimental results confirm the feasibility of the technique. It may find application in video mappers, radar display systems, and other display, recording, or scanning systems requiring extremely accurate CRT sweeps. (Author)

Descriptors :   *CATHODE RAY TUBES, *SWEEP GENERATORS, ERRORS, FEEDBACK AMPLIFIERS, LINEAR SYSTEMS, OSCILLOSCOPES, REDUCTION

Distribution Statement : APPROVED FOR PUBLIC RELEASE