| 摘要 |
PURPOSE:To switch the range of measurement quickly and automatically, by selecting automatically a pressure converter which is used together with a pressure converter for full range of measurement anc corresponds to a part of the range of measurement. CONSTITUTION:The output of a pressure converter 11 for full range of measurement is applied to a logical arithmetic circuit 22 via an A/D converter 21 and stored in a storage circuit 23. At the same time, the circuit 22 gives compensation to the digital pressure data with reference to the compensating data stored in the circuit 23. Based on this compensated data, the working range is read out for pressure converters 12-14 which divide equally the full measuring range stored in the circuit 23, and the converters 12-14 corresponding to the range of measurement are selected via a multiplexer 19. Then the electric power is supplied to the selected converters 12-14, and the outputs of these converters are delivered via a converter 21, the circuit 22 and a D/A converter 24. In such a way, the range of measurement is automatically switched in a short time, and the highly accurate pressure is converted into the electric quantity to be transmitted. |
