| 摘要 |
PURPOSE:To automate measurement and to enhance the accuracy of a measured value to achieve the rationalization in the capacity test of a blower 1 by a method wherein the pulse components of pressure measured by a multi-tubular Pitot tube are attenuated and further changed to a physical amount as well as averaged and the output signal thereof is inputted to perform treatment. CONSTITUTION:An arbitrary gate time is given to a pressure converter 5 from a treating apparatus 6. The physical amount (pressure vibration) variaed in said gate time is converted to frequency as the averaged physical amount [average pressure P'=DELTAtoPdt/DELTAt(gate time)] to be outputted to the treating apparatus 6 of a microcomputer B. In this case, a chamber 3, a change-over apparatus 4 and a pressure converter 5 constitutes a measuring part A. The above-mentioned apparatus 6 calculates the average value of one cycle (20 points dynamic pressure measurement) and further calculates the convergent ratio of dynamic pressure measured for several cycles and, by repeating the measurement of the aforementioned dynamic pressure until the dynamic pressure is brought to the range of a prescribed convergent ratio, preciseness enhancement can be achieved. |
