Oscillator circuit for providing a conductivity ratio of sea water

Claim 2

An oscillator circuit comprising: a. first circuit means for providing a first output signal indicative of a desired measured parameter; b. second circuit means for providing a second output signal which varies linearly with time; c. an output amplifier including first and second inputs and an output and being of the type which provides an output signal which switches between relatively positive and negative output values, depending upon the relative magnitudes of signals applied to said first and second inputs, said output signal being electrically connected to both said first and second circuit means as the input signal thereto; d. the output of said first circuit means being electrically connected to said first input; e. the output of said circuit means being electrically connected to said second input; said second circuit means including, i. a second amplifier having an input and an output; ii. a capacitor connected in the feedback path between said output and input; iii. a resistor connected to said input; iv. the slope of said linearly variable output signal being determined by the values of said cApacitor and resistor.

Claim 3

An oscillator circuit comprising: a. first circuit means for providing a first output signal indicative of a desired measured parameter; b. second circuit means for providing a second output signal which varies linearly with time; c. an output amplifier including first and second inputs and an output and being of the type which provides an output signal which switches between relatively positive and negative output values, depending upon the relative magnitudes of signals applied to said first and second inputs, said output signals applied to said first and second inputs, said output signal being electrically connected to both said first and second circuit means as the input signal thereto; d. the output of said first circuit means being electrically connected to said first input; e. the output of said second circuit means being electrically connected to said second input; said first circuit means including, i. a first amplifier having an input and an output; ii. a first conductivity cell for obtaining the conductivity of a water environment acting on said cell; iii. a second conductivity cell for obtaining the conductivity of a standard sample of water; iv. one of said cells being connected in the feedback path between said output and input; and v. the other of said cells being connected to said input.

Claim 4

An oscillator circuit comprising: a. first circuit means for providing a first output signal indicative of a desired measured parameter; b. second circuit means for providing a second output signal which varies linearly with time; c. an output amplifier including first and second inputs and an output and being of the type which provides an output signal which switches between relatively positive and negative output values, depending upon the relative magnitudes of signals applied to said first and second inputs, said output signals applied to said first and second inputs, said output signal being electrically connected to both said first and second circuit means as the input signal thereto; d. the output of said first circuit means being electrically connected to said first input; e. the output of said second circuit means being electrically connected to said second input; said first circuit means including, i. a first amplifier having an input and an output; ii. a first conductivity cell for obtaining the conductivity of a water environment acting on said cell; iii. a second conductivity cell for obtaining the conductivity of a standard sample of water; iv. one of said cells being connected in the feedback path between said output and input; and v. the other of said cells being connected to said input.