Measuring and testing – Fluid pressure gauge – Null balance type
Patent
1980-05-27
1982-04-06
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Null balance type
73708, 73724, 324 60C, G01L 912
Patent
active
043229778
ABSTRACT:
A digital pressure measuring system with nonlinear resolution is disclosed. The system includes a capacitive pressure transducer with a pressure variable sensing capacitor and a substantially invariable reference capacitor. The capacitors of the transducer are excited by out-of-phase signals and their outputs combined at a summing junction. The output of the summing junction controls the incrementation of a counter whose output is converted to a nonlinear negative feedback signal. A closed loop is formed by applying the feedback signal to the summing junction through a feedback capacitor. The counter is incremented in a direction to null the loop such that its output is representative of the measured pressure.
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Hewlett Packard Operating and Service Manual for an Automatic Capacitance Bridge, No. 4270A, pp. 4-1 to 4-2.
Juhasz John M.
Sell Robert C.
Sheler John R.
Decker Ken C.
Marvin William A.
The Bendix Corporation
Woodiel Donald O.
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