A calibration system including a signal generator device, at least one calibration receiver and a processing circuit is described. The signal generator device has a signal generation circuit configured to generate a signal, at least one signal path terminating at a signal output port of the signal generator device, and at least one tap provided in the signal path. The at least one calibration receiver is connected with the at least one tap in the signal path. The at least one calibration receiver is connected with the processing circuit. The processing circuit is configured to receive measurement results obtained by the at least one calibration receiver and to analyze the measurement results received, thereby determining analysis results.