Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1979-03-28
1980-12-30
Miller, Jr., Stanley D.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
328127, 328151, 328160, 324132, 307229, G01R 1902, G01R 2106, G06G 716
Patent
active
042426383
ABSTRACT:
A circuit arrangement for monitoring the square of the RMS value of a periodic signal in which an integrator following a squarer is reset to zero at periodic intervals. A first limit detector connected thereto delivers, if the limit set therein is exceeded, a pulse which is fed, via a first conjunctive logic element, to the counting input of a counter. The counter delivers a continous signal to an indicator and to the first conjunctive logic element when a preset counter reading is reached. A gate circuit blocks the periodic resetting of the counter as long as the first limit detector responds in each periodic time interval or when the preset counter reading is reached. This circuit permits quick determination of the RMS value.
REFERENCES:
patent: 3911359 (1975-10-01), Metcalf
Glaser Helmut
Schick Ludwig
Davis B. P.
Miller, Jr. Stanley D.
Siemens Aktiengesellschaft
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