Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Self-calibration
Patent
1991-08-21
1993-01-19
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Self-calibration
324 74, 324121R, 364487, 36457101, G01R 1510, G01R 1320
Patent
active
051809737
ABSTRACT:
A measuring instrument having a programmable time base circuit including a digitally adjustable integrator for generating a plurality of sawtooth voltages for the different operational states of a CRT display apparatus. The measuring instrument has an automatic calibration procedure for calibrating the various time base settings. A microcontroller drives the digitally adjustable integrator during calibration of the measuring instrument so as to calibrate the time base circuit for each operational state. A detection circuit detects whether the time base circuit is calibrated and provides a status signal to cause a digital memory in the microcontroller to store calibration values determined in the calibration procedure. During normal operation of the measuring instrument, the microcontroller drives the integrator of the time base circuit using the stored calibration values for the corresponding operational states.
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Van Verzoek, UW; Octrooiraad; B699; May 8, 1991.
Franzblau Bernard
Karlsen Ernest F.
U.S. Philips Corporation
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