Cardiovascular diseases stand as the foremost global cause of mortality, marked by anomalies in the cardiac conduction system and arrhythmic events. Understanding complex arrhythmias non-invasively would help clinicians prior to invasive interventions. Body Surface Potential Mapping (BSPM) has emerged, offering enhanced electrode density to identify alterations in electrical activity and project them onto a 3D perspective of the torso. However, fully harnessing BSPM’s potential to discern specific activation patterns and anatomical origins remains a subject necessitating further investigation and investment. Our research endeavours to validate the effectiveness of our BSPM system in non-invasively characterizing cardiac rhythms. Employing Lagendorff-isolated rabbit hearts as our experimental model, we conduct meticulous validation, utilising concurrent recordings from our non-invasive electric subsystem and a 3 Multi-Electrode Array (MEA) for invasive epicardiac mapping. Furthermore, our system integrates a panoramic optical mapping system, leveraging three cameras to capture the nuanced intricacies of cardiac electrical activity, to ensure robustness and precision as a gold-standard mapping technique. The outcomes of this project reveal distinct patterns in the frequency spectrum when comparing a stable atrial rhythm to a complex cardiac arrhythmia. These differences are highlighted by the contrasts of its activation maps, which illustrate the varying levels of organization in cardiac depolarization between these two rhythms. Through comprehensive frequency and time analysis within this BSPM framework, our study unveils patterns poised to revolutionise our understanding of arrhythmic mechanisms and their origins through a non-invasive lens. These insights hold profound implications for enhancing patient health quality, offering promising avenues for refining diagnostic and therapeutic approaches in cardiovascular medicine.