ZERO LEVEL DETECTING DEVICE, ZERO LEVEL DETECTING METHOD, AND COIL TESTING DEVICE

摘要

PROBLEM TO BE SOLVED: To accurately detect the zero level of attenuating vibration waveform.SOLUTION: In zero level detection processing 60, tentative zero level stipulation processing 62 to stipulate a tentative zero level of an attenuating vibration waveform, intersection point detection processing 63 to detect the intersection point with the tentative zero level in the attenuating vibration waveform based on waveform data, and interval detection processing 64 to detect the interval between adjoining intersection points among the detected intersection points are executed while varying the tentative zero level stipulated in the tentative zero level stipulation processing 62. At step 66, the degree of dispersion among intervals of the individual detected tentative zero level is figured out, and at the same time the tentative zero level that minimizes the figured-out degree of dispersion is detected as a true zero level Vz of the attenuating vibration waveform.SELECTED DRAWING: Figure 2