| 摘要 |
The invention relates to a method and ballast for operating a lamp (3) fitted with a fluorescent tube (2), whereby the operating data of certain recognizable lamp types (T1, T2, Tn-1, Tn), i.e. at least the lamp voltage (UL), lamp current (IL) and preheating currents (Ivorh1, Ivorh2, Ivorhn-1, Ivorhn), is stored in a register (R) for the heating of the electrodes. The preheating currents (Ivorh1, Ivorh2, Ivorhn-1, Ivorhn) are allocated to given areas of the resistance of the electrode (RE > X), (Y </= RE </= X), (Z </= RE </= Y), the resistance of the electrode (RE) is measured during a preheating phase and the preheating current (Ivorh1, Ivorh2, Ivorhn-1, Ivorhn) allocated to the measured resistance of the electrode (RE) is adjusted, whereby the fluorescent tube (2) is operated or a given period with a dimming current (ID) of a known intensity within a given starting phase (S) occurring after the preheating phase (V), the existing voltage (UL) of the fluorescent tube is measured, the register (R) is searched for the lamp voltage (UL1, UL2, UL3, UL(n-1), U (Ln) that comes closest to the measured lamp voltage (UL) of the fluorescent tube (2) and the operating data required for the operation of the fluorescent lamp (2) and allocated to the measured lamp voltage (UL) by the register (R) is adjusted.
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