I have 4 crocodile clip wires, if I'm not mistaken 2 wires (red) connect to anode and the other 2 black wires connect to cathode. Both pairs of wires are plugged at the back of the SMU. Problem arises when my sample showed inconsistency in power conversion efficiency when measure them multiple times. Is there any precaution is should take note of when using the newport solar simulator? How should I connect the 2 red and black wires to my perovskite solar cell? Thank you.