Reference quantity and unknown quantity comparator

Details Reference quantity and unknown quantity comparator Reference quantity and unknown quantity comparator

1975-03-24

1976-12-21

Rolinec, R. V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Balancing

340248A, G01R 1706, G08B 2100

Patent

active

039991245

ABSTRACT:
A method of and apparatus for determining when an unknown quantity is within a desired range of a reference quantity. The apparatus includes a dual slope integrator which integrates the reference quantity and the unknown quantity and discharges the resultant integrated levels. By integrating the reference quantity at least once and the unknown quantity at least twice for three different time periods which differ from one another by amounts which are proportional to the desired range, a comparison of the discharge times of the resultant integrated levels will provide an indication of whether the unknown quantity is within the desired range, when the desired range is a percentage of the value of the reference quantity. By integrating the reference quantity at least once and the unknown quantity at least twice for the same time period and then discharging each of the resultant integrated levels for three different time periods which differ from one another by amounts which are proportional to the desired range, a comparison of the times to further discharge to a preselected level will provide an indication of whether the unknown quantity is within the desired range, when the desired range is a percentage of full scale.

REFERENCES:
patent: 3617885 (1971-11-01), Wheable

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