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Test#1. We investigate the operation of the Buck-Boost converter in CCM and in DCM. We measure the duty-cycle, while varying the input voltage and the load current. The DCM is detected by analyzing the inductor current waveform flowing through the current sensing resistor R, on the board. The duty-cycle is measured by analyzing the switching node voltage at TEST PIN TP.. The test is performed for different input voltage and load current conditions, with different switching frequency set by jumper J... The mode of operation and the measured values of the duty-cycle are compared with the predictions of operation mode and of duty-cycle values assessed by means of theoretical formulae. Test#2. We analyze the impact of the inductance on the CCM/DCM operation of the Buck boost converter, while varying th input voltage and the load current. The test is performed for three values of the load current and with two inductors available on the boards, selected by jumpers H,-H,-H,. The goal is to see the effect of the inductance on the threshold value of input voltage bounding the transition from CCM to DCM, and to analyze the correlation with the theoretical formulae that predict the DCM operation