Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-10-17
1976-11-09
Heyman, John S.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
328 4, 328130, 324 61R, 239 64, 73 73, 317DIG3, H03K 1756, B05B 1208
Patent
active
039913759
ABSTRACT:
An analog scanner for the control of various industrial, agricultural and domestic operations and processes comprising at least two pairs of probes utilized for measuring a physical property of a medium therebetween including at least a pair of control signal sources, at least a pair of reference level controllers, at least a pair of sensor selectors, and at least a pair of control actuators. A timing mechanism including a counter is connected to the signal sources for selectively energizing one of the signal sources associated with a particular position of the counter in sequence with the other of the sources. Each pair of sensor selectors senses the physical property of the medium between its probes and develops a voltage proportionate to the value of the physical property of the medium between the probes.
REFERENCES:
patent: 2812976 (1957-11-01), Hasenkamp
patent: 3037704 (1962-06-01), Kinigsberg et al.
patent: 3504189 (1970-03-01), McHenry
patent: 3599867 (1971-08-01), Griswold et al.
patent: 3777976 (1973-12-01), Milovancevic
patent: 3824480 (1974-07-01), Eshraghian
patent: 3876950 (1975-04-01), O'Connor
Kolar Joseph
Riggs E. Russell
Heyman John S.
Lindsley Warren F. B.
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