Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Cathode ray
Patent
1986-09-17
1988-05-10
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Cathode ray
324 77A, 364487, G01R 1320
Patent
active
047438452
ABSTRACT:
In an oscilloscope, a readout control circuit is adapted to create a horizontal cursor on an oscilloscope screen at a vertical level controlled by cursor level data generated by a microcomputer, and to cause the beam to form characters on the screen indicating a voltage represented by the vertical level of the cursor. Vertical offset and vertical gain parameters characterizing a vertical preamplifier system controlling display of a waveform are measured and utilized to determine the value of cursor level data needed to cause the readout control circuit to position the cursor on the screen to accurately reflect a selected voltage with respect to voltage magnitudes represented by points on the displayed waveform. The oscilloscope is adapted to measure peak magnitudes of a vertical preamplifier input signal, and the readout control circuit permits the oscilloscope to display a cursor on a screen at a level indicating the magnitude of the measured peak with respect to magnitudes represented by a displayed waveform.
REFERENCES:
patent: 2539971 (1951-01-01), Potjer
patent: 2843824 (1958-07-01), Whittier
patent: 4476432 (1984-10-01), Olson
patent: 4536707 (1985-08-01), Herweg
Diller Calvin D.
Stevens Douglas C.
Bedell Daniel J.
Dellett John P.
Karlsen Ernest F.
Noe George T.
Tektronix Inc.
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