NASA NTRS · 19700000299
Computerized polar plots by a cathode ray tube/grid overlay method
Abstract
Overlay is aligned with four calibration dots so it is not affected by CRT drift or changes in vertical or horizontal gain when producing Nyquist /frequency-response phase/amplitude/ plots. Method produces over 50 plots per hour.
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Freeman, J. M., Shoup, E. L.. 1970-06-01. Computerized polar plots by a cathode ray tube/grid overlay method. https://ntrs.nasa.gov/citations/19700000299
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