Apparatus for measuring the value of a variable condition

Details Apparatus for measuring the value of a variable condition Apparatus for measuring the value of a variable condition

1975-09-15

1977-05-24

Olms, Douglas W.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 65R, 340177VA, H04B 346

Patent

active

040257363

ABSTRACT:
The current flowing through a variable resistor of a transducer, responsive to a variable condition, is measured without interference with the normal operation of electrical circuitry to which the resistor is connected. Current-diverting means, connected in series with the transducer resistor, diverts the transducer current to measuring circuitry which includes a current to voltage converter operating in a manner to return the diverted current to the electrical circuitry. Means responsive to the output of the converter and to reference voltages derived from the electrical circuitry, provides output values corresponding to the state of the variable condition at the time a measurement is made.
In a specific embodiment of the invention, the apparatus monitors the internal gas pressure of a pressurized telephone cable without interfering with the normal use of a subscriber's equipment. The telephone company voltage source is used to produce a flow of current through a pressure to resistance transducer during the `on-hook` condition of the subscriber's lines across which the transducer resistor is connected. Current-diverting means, inserted into one line of the subscriber, diverts current from the telephone company equipment to measuring circuitry which converts the current flowing through the transducer resistor to pressure values.

REFERENCES:
patent: 3105882 (1963-10-01), Meyer
patent: 3105883 (1963-10-01), Higson
patent: 3417210 (1968-12-01), Chapin

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