Two wire circuit having an adjustable span

Details Two wire circuit having an adjustable span Two wire circuit having an adjustable span

G - Physics

08

C

73/164, 340/164

G08C 19/02 (2006.01)

Patent

CA 1213955

ABSTRACT OF THE DISCLOSURE A two wire circuit has a total direct current signal, It, proportional to a sensor signal which is responsive to a parameter to be sensed. It flows through a first terminal which is coupled to an external power source and load and then through a second terminal. A current controller is coupled to the sensor and across the first and second terminals for controlling It. A feedback amplifier amplifies a feedback signal which is responsive to It to provide an amplified feedback signal. A span adjustment is coupled to the feedback amplifier and the current controller for receiving the amplified feedback signal to adjust the amplified feedback signal such that It is controlled by the current controller as a function of the sensor signal and the adjusted, amplified feedback signal.

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