| 摘要 |
PURPOSE:To perform high-precision distance amplitude correction easily by calculating the amount of correction between respective distances by a curve on the basis of echo height differing according to distance. CONSTITUTION:A calibration-mode probe 1 is placed on a calibration test bar 2 and an echo of an artificial defect 3 is displayed on an A scope 6. The level of necessary echo height is decided as a reference level, and the amplification factor of an amplifier 5 is so adjusted that the defect echo to be the reference level. A microcomputer 11 reads the state of a switch for an increase or decrease in amplification factor on a panel 12, and increases or decreases data to be sent to a D-A converting circuit 7, thus controlling the amplification factor of the amplifier 5. The completion of level adjustment is reported to the microcomputer 11 by operating a switch on the panel 12. The microcomputer 11 fetches distance data from a distance counter 9 and the controlled variable applied to the D-A converting circuit 7 to add them to data up to last data, and thus finds optimum controlled variable of each distance to write it in a memory 8, thereby performing switching to actual fault detection mode automatically. |
