Communications: electrical – Continuously variable indicating – With meter reading
Patent
1988-05-06
1989-10-17
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
340825710, 340825160, 340825770, 361139, H04Q 900
Patent
active
048750409
ABSTRACT:
A device has a communication line leading to a control desk and a power supply connected to the communication line. Connected to the power supply are two circuits each comprising a unit for testing the communication line for condition and a current amplifier which are connected in series with each other. Connected to the inputs of each current amplifier is an interference suppression unit having its input connected to a current comparison unit. Two current comparison units are connected to the power supply and an electrical apparatus being controlled. The device also has a logical circuit connected to the power supply and the test units and an actuating unit connected to the logical circuit and one of the test units and coupled to the electrical apparatus.
REFERENCES:
patent: 3473152 (1969-10-01), Lunquist et al.
patent: 3588828 (1971-06-01), Schulein
patent: 4109186 (1978-08-01), Fraque
patent: 4556882 (1985-12-01), Brifman et al.
Dzjuban Vitaly S.
Konoplyanko Anatoly I.
Sazhin Alexandr D.
Zhitnikov Valery K.
Pudpud E. O.
Yusko Donald J.
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