| 摘要 |
PURPOSE:To detect the abnormality such as a rare short of a coil to be tested, by utilizing the fact that a pulse voltage is reflected at a change point of impedance and detecting this reflected wave. CONSTITUTION:The pulse voltage from a pulse elective power source 3 is applied to a coil 1 to be tested, and this pulse voltage is detected by a cathode- ray tube oscilloscope or synchroscope 5A and is observed. In this case, an impedance adjusting device 6 is so adjusted that an unnecessary reflected wave is not generated and a waveform indicated in Fig. (a) is attained. If a rare short exists in the coil 1 to be tested, the reflected wave is generated in the rare short part, and a waveform having a different peak is obtained as shown by a point P in Fig. (b), and thus, the abnormality such as a rare short is detected. |
