The ATLAS detector at the LHC has a powerful trigger system which identifies among the billions of collisions observed by the detector every second, these collisions that are of interest for physical analyses. One part of this trigger system is the Level-1 Calorimeter Trigger. In the scope of this work, the finite-impulse-response filters and, in addition, the look-up tables in the PreProcessor of the Level-1 Calorimeter Trigger were calibrated for the Run-3 of the LHC. Since the program code required for the calibration was not executable for software related reasons at the beginning of Run-3 in July 2022, it was corrected and adapted within the scope of this work. Through a subsequent calibration for the standard filling scheme originally used and an additional performance analysis, it could be quantitatively proven that the use of the finite-impulse-response filters which had not been adapted to the changed conditions in Run-3 up to that point, had not led to any significant loss of performance for most of the calorimeter regions. In addition, a calibration for the mixed-filling scheme laid the foundation for future data recordings for physical analyses with the ATLAS detector. In particular, these adjustments prevented the number of false ET assignments from being too high. Furthermore, additional performance analyses showed that with the newly calibrated finite-impulse-response filters an efficient identification of the associated bunch crossing for each digital pulse is possible, even when the mixed-filling scheme is used. |