| 摘要 |
A circuit for accurate pressure measurements, for example, for use in controlling an aircraft, uses a capacitive pressure transducer (C) as the frequency or pulse rate determining element in an R-C charge/discharge circuit (12) which does not involve an inductor and so is small and light. Pulses from the circuit (12) are counted in a counter (42) controlled by a reference oscillator (16) to give an output representing in digital form the instantaneous value of the capacitor and thus of the pressure being sensed. The digital output can be used in control means. |
