| 摘要 |
PURPOSE:To improve an operation by detecting respectively a normal electric discharge, a sustained arc discharge time, and no-discharge time wherefrom only the normal discharge time is detected to indicate as a pulse efficiency. CONSTITUTION:A device incorporating the first and the second comparison amplifiers 8, 9 which detect in comparing with a voltage applied by a level set units 4, 5 that may optionally set an electric discharge pulse in a normal discharge time and a sustained arc discharge pulse from the discharge voltage pulse that applies across the electrodes wherein the electrode 2 and the workpiece 3 are formed, the third comparison amplifier 7 to detect in comparing the voltage applied from a level set unit 6 with an across-electrode voltage pulse immediately applying said discharge voltage pulse, a logical circuit 12 which permits to produce only a discharge time pulse in a normal discharge time by taking a logical product of said respective amplifier, and a switch circuit 14 which controls switching an averaged electric discharge power source pulse by the output of said circuit and an indicator 17. |
