| 摘要 |
A pressure sensing system for compensating the actual pressure value sensed by a pressure transducer 1 uses a CMOS microprocessor 3 to calculate initial correction coefficients for the particular transducer being used from four combinations of pressure sensed by the transducer and temperature sensed by a temperature sensor 2. The correction coefficients are then stored in a memory and used for correcting the sensed pressure values by the microprocessor according to variations in temperature. The microprocessor also programmes analogue compensating circuitry 4 via its input/output port lines to maximise the voltage swing input to the microprocessor by providing coarse corrections to the gain and offset of the signal from the pressure transducer. The object is to simplify the process of calibration, to remove the need for external adjustments of a transducer and to allow changes of transducer type without the need for external adjustments. <IMAGE> |
