Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With voltage or current conversion
Patent
1986-11-18
1988-11-15
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With voltage or current conversion
324 77A, 324 99D, G01R 1926, G01R 1706
Patent
active
047852364
ABSTRACT:
Device for measuring voltage by sampling, including a voltage metering sampling means (2) driven by a pilot frequency generator (12), an amplifier (3) to amplify the sampled signal and a signal processing unit (6) to evaluate the amplified signal in accordance with the prescribed measuring task. The device, in accordance with the invention, contains an auxiliary oscillator (14) which produces an auxiliary signal, as well as an amplifier (3) with adjustable amplification, which is located between sampling unit (2) and signal processing unit (6), and a differential circuit (5). The auxiliary signal on one side, together with the voltage to be measured, is connected to signal input (17) of sampling unit (2), on the other side by means of a phase shifter (13) to an input (25) of differential circuit (5). A feedback branch (28), selective for the frequency of the auxiliary signal, is connected between, on one side, the output of differential circuit (5) and/or its other input (24) which is connected to adjustable amplifier (3) and, on the other side, the control input (21) of adjustable amplifier (3).
REFERENCES:
patent: 3412331 (1968-11-01), Boatwright
patent: 3896389 (1975-07-01), Basse
patent: 4313212 (1982-01-01), Whitlock
Balogh Andras
Bella Lajos
Somogyi Gyula
Karlsen Ernest F.
Miki Merestechnikai Fejleszto Vallalat
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