Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Self-calibration
Patent
1987-10-15
1988-10-18
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Self-calibration
324105, 324 74, 324121R, G01R 3500
Patent
active
047790393
ABSTRACT:
Measurement accuracy of an oscilloscope is extended by monitoring the temperature within the oscilloscope, and automatically entering a calibration cycle if the temperature varies by a predetermined amount. A temperature sensor is strategically located within the oscilloscope to sense variations in temperature. A first sensed temperature value is stored. Upper and lower temperature limits representing the maximum permissible deviation from the stored value are calculated. Instantaneous temperature values from the sensor are compared with the stored value, and as long as the instaneous values are with the limits, an indication of extended accuracy is provided. If the instantaneous temperature values vary outside the limits, an automatic calibration cycle is initiated. After calibration, a new temperature value is stored and the monitoring process continues to ensure extended accuracy.
REFERENCES:
patent: 3603979 (1971-09-01), Kasakowski
patent: 3995263 (1976-11-01), Shreve et al.
patent: 4467279 (1984-08-01), MacCormack
patent: 4663586 (1987-05-01), Swevlein et al.
Edmonds Warren S.
Eisenzopf Reinhard J.
Noe George T.
Tektronic, Inc.
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