| 摘要 |
A conditioning circuit includes a computer connected to a pressure transducer having a variable frequency oscillator the output signal of which varies with pressure, a temperature sensor, a read only memory storing constants which are dependent upon the particular transducer and application, and a counter connected to count the variable frequency output signal when gated. In accordance with the disclosed method, the computer obtains a digital count signal indicative of oscillator frequency by gating the output signal to the counter for a predetermined interval, converts an analog signal from the temperature sensor to a digital signal, and then computes a linearized, temperature compensated digital pressure signal in accordance with a predetermined function which utilizes constants stored in the read only memory to initially scale and translate the count signal for maximum computer accuracy, corrects for nonlinearities in the count signal, and corrects for variations in the count signal with temperature. The computed signal then appears at the output as a binary digital word accurately representing sensed pressure over a wide range. |
