公开(公告)号：JPH0712598A

公开(公告)日：1995-01-17

申请号：JP10452894

申请日：1994-04-20

Applicant: ADE CORP

Inventor： NOERU ESU PODEUJIE ,  SUKOTSUTO PII KERAA ,  ROI MARORII

IPC: G01D18/00

Abstract: PURPOSE: To output a calibrated measurement signal showing a characteristic by providing a signal conversion/conditioning circuit for conditioning a tranducer output by combination of parameters involved in both to be converted to an intermediate signal having a voltage amplitude related to the characteristic of an object. CONSTITUTION: A measurement circuit 14 has an object 12, and a transducer 20 such as a capacity type probe, and further has a signal conversion/ conditioning circuit 22. A front end circuit 22a of the circuit 22 converts a capacitance shown by a transducer output signal 27 to an intermediate signal having a voltage amplitude related to the distance between the tranducer 20 and the object 12. A signal conditioning circuit 22b processes a signal 29 to output a calibrated measurement value signal 32, which is displayed for a user by a display/post-processing circuit 16. The tranducer 20 has parameters (a), (b), and the circuit 22a has parameters (c), (d), and is controlled according to the fluctuation by adjustable constitutive parts 30a, 30b which the circuit 22 has. Thus, the need of controlling the whole system each sub-system can be eliminated.