| 摘要 |
PURPOSE:To prevent the setting mistake for brightness, by resetting the thyristor trigger phase angle to a standard value at the re-application of power supply. CONSTITUTION:When an illumination reference is incoming, the phase angle data in which correction is made in accordance with the actual power supply voltage to the counter of the logic unit in the computer 6a, is loaded, and a trigger instruction signal is given to a trigger pulse generator 12 at the specified phase angle to conduct the triac. Next, the phase angle data which is corrected according to the actual voltage variance is stored as the corrected phase angle data. |
