Linearizing circuit for a non-destructive testing instrument hav

Electricity: measuring and testing – Magnetic – Hysteresis or eddy current loss testing

Patent

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Details

324225, 324132, G01R 3312

Patent

active

042108667

ABSTRACT:
A linearizing circuit is provided for a non-destructive testing instrument having circuit means developing a DC voltage having a non-linear relationship to units of measurement or of conductivity or some other characteristic measure. A plurality of linearizing stages are provided each including an adjustable resistance connected between a reference voltage source and an output line when the potential of the output line is between the reference voltage and one limit of the DC voltage. Preferably, an analog switch is provided in series with the adjustable resistance and is controlled from an operational amplifier, with a second operational amplifier being provided having an output connected through the analog switch and the adjustable resistance to the output line. The circuit is very accurate and reliable and is readily adjusted by a method wherein the resistances are adjusted in accordance with reference voltages in a certain sequence to obtain accurate adjustment with no juggling operation.

REFERENCES:
patent: 3244977 (1966-04-01), Folsom
patent: 3549998 (1970-12-01), Fluegel
patent: 4074186 (1978-02-01), Flaherty

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