Title:
CORRECTION CIRCUIT OF SENSOR OUTPUT
Document Type and Number:
Japanese Patent JP3272509
Kind Code:
B2
Abstract:
PURPOSE: To provide the correction circuit, of a sensor output, wherein a three- wire system is maintained and an initial value can be set easily from the outside.
CONSTITUTION: Before starting a measurement, a pulse train (a simple pulse train or a coded-data pulse train) for setting an initial value is superposed on a power-supply voltage applied to a power-supply terminal 1. A first circuit 4 takes out the pulse train superposed on the power-supply voltage. A second circuit 5 outputs the take-out pulse train by counting the pulse train or by making the pulse train parallel. A third circuit 6 converts the output of the second circuit 5 into an analog voltage. A fourth circuit 7 sends out the comparison of the magnitude relationship between a sensor output voltage and the converted analog voltage and a result obtained by adding both to a signal line via a terminal 2 as corrected sensor outputs. A fifth circuit 8 forms operating power-supply voltages for the second circuit 5, the third circuit 6 and the fourth circuit 7 on the basis of the power-supply voltage applied to the power- supply terminal 1.
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Inventors:
Michitaro Hiraoka
Application Number:
JP24881793A
Publication Date:
April 08, 2002
Filing Date:
September 09, 1993
Export Citation:
Assignee:
Nippon Avionics Co., Ltd.
International Classes:
G01D3/00; G01D3/028; G01R19/00; (IPC1-7): G01R19/00; G01D3/00
Attorney, Agent or Firm:
Yoshihiro Yawata