HEC beamtest calibration The data from test beams were analysed. The first priority was to investigate the calorimeter response to pions. We also treated with linearity, homogeneity, energy resolution and other importatnt characteristics. A method of energy reconstruction using topolgy of hadronic shower had been also proposed and now it is under developement. Figure 1: Block diagram of the front-end, read-out and trigger electronics. Figure 2: Upper figure: normalized measuremed particle signal, using optimal filter weights computed from the calibration signal. Lower figure: close up of the peak region. Calibration of the ATLAS Calorimetric System In the Fig. 3 the ATLAS calorimetry spacing is shown. Figure 3: ATLAS calorimetry and in the Fig. 4 the angle region for ATLAS calorimetry is shown. Figure 4: ATLAS calorimetry - angle region Very important task for calorimeter calibration is cluster classsification. We proposed a method for cluster classification using some topological characteristics (moments) of the cluster. The result is shown in the Fig. 5. Figure 5: Example of some topological moments as a function of EM component of deposited energy. In the last plot is our estimation of this component (calculated using the above mentioned characteristic) vs. MC truth.