Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Demand – excess – maximum or minimum
Patent
1983-04-27
1987-02-03
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Demand, excess, maximum or minimum
324119, 433 32, G01R 1904
Patent
active
046410899
ABSTRACT:
An ammeter apparatus and method of taking current reading includes current inputs receiving a signal from a current source through a suitable gate. A conversion circuit having a preamplifier and an amplifier, in inverted configuration, produce a signed voltage proportional to the current signal. The signed voltage is passed, to both a rectifier and a polarity indicator through another gate. A comparator switches the polarity indicator gate and a third gate upon receipt of a threshold value rectified voltage from the rectifier. The third gate interconnects the rectifier and a charge-retaining element, and a meter outputs a display corresponding to the charge thereon. A fourth gate connects the charge-retaining element to ground in order to discharge the retained charge. A timing circuit with a manual override operates the input gate and the fourth gate, and a timed power supply provides operating voltage for the circuit. The method includes the steps of detecting the current, producing a signed voltage therefrom, outputting the voltage polarity, rectifying the signed voltage, and outputting and displaying the greatest voltage value occurring in a selected interval of time.
REFERENCES:
patent: 3878984 (1975-04-01), Sotiropoulos et al.
patent: 4175252 (1979-11-01), Shinoda
patent: 4301407 (1981-11-01), Koslar
patent: 4311960 (1982-01-01), Barr
patent: 4339712 (1982-07-01), Walters
patent: 4373141 (1983-02-01), Sanders
Hynds, J., "Auto Peak Detector for Use With Pen Plotters", Electronic Product Design, Mar. 1982, p. 26.
Montano, J., "Bipolar S/H With Indefinite Hold Time, Digital O/P", Electronic Engineering, Jul. 1979, vol. 51, No. 625, pp. 25-27.
Huggins Hal A.
Pearman Bruce W.
Baker Stephen M.
Eisenzopf Reinhard J.
Huggins Hal A.
Martin Timothy J.
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