| 摘要 |
PROBLEM TO BE SOLVED: To provide a tester for a bulb for a railway signal lamp, configured to quickly and properly discriminating a G-type light bulb from an I-type light bulb.SOLUTION: A tester for a bulb for a railway signal lamp includes: a three-terminal socket 31 compatible with both types; a first resistance value detection circuit 35 that detects a physical quantity corresponding a resistance value between terminals MM, CC to determine a first detected resistance value D; a second resistance value detection circuit 36 that detects a physical quantity corresponding a resistance value between terminals SS, CC to determine a second detected resistance value J; a first resistance checking means 37 that checks whether the detected value D is a proper value for a main filament 12 of a G-type light bulb 10; a second resistance checking means 38 that checks whether the detected value D is a proper value for a filament 22 of an I-type light bulb 20; a third resistance checking means 39 that checks whether the detected value J is a proper value for a sub filament 13 of the G-type light bulb 10; a determination means 40 that determines whether a railway signal bulb mounted on the socket 31 is a normal G-type bulb, a normal I-type bulb or others, on the basis of checking results of the checking means 37-39; and presenting means 32, 33 for showing a result of determination. |
