Correcting circuit for differential pick-up, comprising digital

Details Correcting circuit for differential pick-up, comprising digital Correcting circuit for differential pick-up, comprising digital

1979-12-04

1982-04-20

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324233, G01N 2772, G01R 3314

Patent

active

043261663

ABSTRACT:
A circuit for automatically correcting a signal given by a differential pick-up. Said circuit comprises as many corrective channels as there are frequencies in the signal. Each of said channels, comprises a band-pass filter centered to the frequency ascribed to the respective channel, an analyzer for the resistive (X) and reactive (Y) portions of the filtered voltage, two stages for the separate treatment of said two portions, each of said stages comprising a threshold comparator, a counter, a digital-analog converter, and a multiplier for multiplying by a reference-signal, either in phase (as regards portion X), or in phase-quadrature (as regards portion Y), with respect to the pick-up energization. An adder is adapted to reconstitute a corrective voltage to be substracted from the input signal.

REFERENCES:
patent: 4006407 (1977-02-01), Flaherty et al.

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