The third experiment was carried out on for a multi-crystalline silicon solar cell marked as sample #3. Likewise, MPECS applied the same frequencies used for the mono-crystalline solar cells and phase rotation helped to emphasize the effect due to defects. As shown in Fig.9, the sample #3 has a visible crack on the upper left in a photo. As a result of Eddy Current imaging, the C-Scans for both frequencies prove an additional internal crack near the externally visible crack.