Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Self-calibration
Patent
1992-10-06
1994-10-18
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Self-calibration
73765, 324706, 36457105, G01R 102, G01B 718
Patent
active
053571894
ABSTRACT:
An analog input apparatus comprises bridge measuring devices 11 and 31 connected to a bipolar voltage power supply 5, analog multiplexers 18, 19, 38, and 39 responsive to an output level of an oscillator 4B for switching a polarity and outputting two outputs of each of the bridge measuring devices 11 and 31, amplifiers 12 and 32 for amplifying bipolar outputs provided through the analog multiplexers 18, 19, 38, and 39, and an analog-to-digital converter 2 for converting outputs of the amplifiers 12 and 32 into digital form and outputting the resultant digital values. An analog input method comprises the steps of correcting a measured value with the digital value output when voltage at either middle point of a bridge circuit is fed into both input terminals of a differential analog amplifier or feeding two middle-point voltages of a bridge circuit into input terminal of an analog amplifier in order and providing a measured value based on the difference between the digital values output from the analog amplifier.
REFERENCES:
patent: 2877308 (1959-03-01), Reiner et al.
patent: 4404856 (1983-09-01), Honda et al.
patent: 4535278 (1985-08-01), Milkovic
Karlsen Ernest F.
Mitsubishi Denki & Kabushiki Kaisha
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