Arrangement for the generation of a signal in proportion to a ca

Details Arrangement for the generation of a signal in proportion to a ca Arrangement for the generation of a signal in proportion to a ca

1980-01-14

1982-02-23

Groody, James J.

Communications: electrical

Continuously variable indicating

With supply voltage regulation or compensation

324 60R, 34087037, 34087042, G08C 1910

Patent

active

043171168

ABSTRACT:
An active measuring converter for connection between a two-wire line and an impedance to be measured, wherein an oscillator supplies alternating voltage to the impedance, and the variation in current drawn by the oscillator is in accordance with the value of the impedance. The measurement signal is transmitted together with the power for the active measuring converter via a two-wire line. The oscillator supplies the impedance with stabilized AC voltage independent of its operating current. Electronic switching devices coupled to the impedance either add the alternating current to the measuring signal as an impressed current, or couple it to a resistor-capacitor network for establishing a reference input for the controlled variable voltage. The alternate coupling of the alternating current corresponds to the alternating polarity of the AC current flowing through the impedance. The impedance may be the capacitance of a sonde which varies according to filling level. The converter draws a minimum of current and may be adjusted for any given measurement conditions.

REFERENCES:
patent: 3646538 (1972-02-01), Frick
patent: 3948098 (1976-04-01), Richardson et al.
patent: 3975719 (1976-08-01), Frick
patent: 4084155 (1978-04-01), Herzl et al.
patent: 4146834 (1979-03-01), Maltby et al.
patent: 4205327 (1980-05-01), Dahlke

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