Device for reading spectral selective measuring feeder to monitor temperature of power transformer, has evaluation unit producing output signal by based on ratio of measuring values determined with operating parameter values

摘要

The device has an evaluation unit (12) for adjusting an operating parameter of a light source i.e. LED (2), to different operating parameter values. The evaluation unit determines measuring values associated with the different operating parameter values, where the measuring values are dependent upon an emission spectrum of light emitted by the source. The unit comprises a storage unit (13), and the values are stored in the storage unit. An output signal (14) is produced by the unit based on a ratio of the measuring values determined with the parameter values of the source. An independent claim is also included for a method for reading a spectral selective measuring feeder.