Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1979-04-12
1980-12-16
Robinson, Thomas A.
Communications: electrical
Continuously variable indicating
With particular transmitter
34087030, 34087039, G08C 1910
Patent
active
042400678
ABSTRACT:
Device for transmitting an alternating analog signal from a sensor to a measurement room remote from the sensor, comprising a preamplifier situated in the vicinity of the sensor for preamplifying the output signal thereof, a line with two conductors, a measuring circuit receiving through the line the preamplified signal, a circuit for supplying power to the preamplifier, a circuit for checking the proper operation of the device and a circuit for modifying the gain of the preamplifier. The line transmits simultaneously the DC supply current, a checking signal in the form of an alternating voltage, a gain modification signal by modifying the level of the DC supply current and the measuring signal by a charge variation generated by an electric charge generator inserted between the preamplifier and the line. A DC current absorber is inserted between the output of the charge generator and the supply terminal of the preamplifier.
REFERENCES:
patent: 3646538 (1972-02-01), Frick
patent: 3975719 (1976-08-01), Frick
Robinson Thomas A.
Societe Chauvin Arnoux
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