| 摘要 |
PURPOSE:To easily specify a broken-filament lamp and judge a continuously broken filament by detecting the output voltage and output current of a constant-current power source, closing and opening the contact between secondary winding terminals several times at the time set in response to the lamp number when a broken filament is detected, and judging the lamp number based on the signals. CONSTITUTION:Broken filament detecting slave machines R1-Rn which detect the output voltage and output current of a constant-current power source 2 for many transformers T1-Tn in which secondary windings are connected to lamps L1-Ln respectively and primary windings are connected in series, detect the broken filament of the lamp for each transformer, and close and open the contact between secondary winding terminals several times at the time set in response to the lamp number are provided. A broken filament detecting master machine 5 judging the lamp number of the lamp with a broken filament based on the output signals of voltage and current detecting sections is provided. Which lamp has a broken filament is judged, and whether the filament is continuously broken is easily judged. |
