| 摘要 |
A method for determining the remaining operating life of a fluorescent lamp (2) comprising cathodes (3), when the fluorescent lamp (1) is a part of a fluorescent lamp circuit (8), which in addition to the fluorescent lamp (1) includes a ballast, for example a capacitor (C) and an inductance (4). In accordance with the method the remaining operating life of the fluorescent lamp (1) is deduced from a phase difference of a voltage (Uh) applied over a cathode (3) in relation to another current or voltage phase in the fluorescent lamp circuit (8). <IMAGE> |
