Conductivity measuring instrument having linearization means...

Details Conductivity measuring instrument having linearization means... Conductivity measuring instrument having linearization means...

G - Physics

01

R

324/45

G01R 27/02 (2006.01)

Patent

CA 1075312

TITLE: CONDUCTIVITY MEASURING INSTRUMENT HAVING LINEARIZATION MEANS AND A DIGITAL READ-OUT Abstract of the Disclosure Conductivity measuring instruments are provided in which a test coil is supplied with alternating current and a detector responds to the voltage across the test coil to develop an analog voltage which is applied to a linearization circuit to develop an output voltage as a linear function of conductivity, the output voltage being applied to a digital read- out unit As a function of conductivity, the analog voltage is single-valued, preferably with no more than a gradual slope change over a wide range of conductivity values. In one embodi- ment, a high impedance is provided in series with the test coil, the detector is a phase detector operated to respond primarily to the inductive component and linearization circuit is of a diode-function type. Alternatives are in the use of a phase-to-voltage type of detector and in the use of a digital type of detector and in the use of a digital type of linear- ization circuit. - 1 -

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