| 摘要 |
PURPOSE:To easily execute the weighting by connecting the series circuit of a plurality of sensors to a primary resistance between a power supply and an earth, connecting a weighted resistance in parallel to each of the sensors and connecting the connecting point between the primary resistance and the series circuit to an A/D converter. CONSTITUTION:A series circuit 12 consisting of an inner air sensor 1 and an external air sensor 2 is connected to a power supply 11 via a primary variable resistance R1 and earthed. Variable resistances Ra and Rb are connected to the sensors 1 and 2, respectively to weigh. An A/D converter 9 is connected to the connecting point X of both the resistance R1 and the series circuit 12 and the A/D converter 9 is connected to a computer 10. The detected values except those of the sensors 1 and 2 are sent to the A/D converter 9. In such constitution the circuit may be configurated simply and the weighting of detected values be changed easily. |
