Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With amplifier or space discharge device
Patent
1976-09-15
1977-07-19
Rolinec, Rudolph V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With amplifier or space discharge device
324 74, 330112, G01R 130, G01R 102
Patent
active
040371549
ABSTRACT:
A circuit permitting an operator to accurately calibrate an instrument to indicate when a variable analog quantity being measured is zero. The analog signal is connected to the input of an operational amplifier which operates in stable mode for large analog inputs and operates in oscillation mode for very small analog inputs. The output of the operational amplifier is compared to zero and when the analog input is greater than zero, the comparator output is a logic zero. When the analog input is less than zero and not in the immediate vicinity of zero, the comparator output is a logic one. When the analog input is very small and less than zero, the operational amplifier operates in oscillation mode as the circuitry connected thereto causes it to oscillate with the duty cycle of the negative portion of the oscillation decreasing as the analog input comes closer to zero. Accordingly, the output of the comparator also oscillates. The comparator output connects to a sign driver of a typical seven segment display and the sign indication provided thereby grows dimmer as the analog input approaches zero from the negative direction.
REFERENCES:
patent: 3264569 (1966-08-01), Lefferts
patent: 3484692 (1969-12-01), Lode
Chamran Morteza M.
Nemec Allen R.
Crane J. D.
Giarratana S. A.
Karlsen Ernest F.
Masselle F. L.
Rolinec Rudolph V.
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