| 摘要 |
PURPOSE:To facilitate and speed up measuring operation at a maximum and a minimum point by deforming a spring at the tip of a pressure detection pin, and classifying the electric signal of a piezoelectric conversion unit by two systems and display the maximum and minimum values of spring pressure at the same time. CONSTITUTION:The output signal of the piezoelectric conversion unit 15 is amplified by a differential amplifier AM and passed through a low-pass filter LF to remove a noise, and then the signal is classified by two systems. One is inputted to a peak value detecting circuit PD and only its peak value is inputted to a trailing-stage sample value holding circuit SH. Then, its output is digitized through an AD converter CV to display the maximum value of the spring pressure in snap action on a display device. The other signal is passed through a sample value holding circuit SH and an A/D converter CV and then inputted to a minimum value comparing circuit LD to detect only the minimum value, so that the minimum value of the spring pressure in snap action is displayed on the display device 24. |
