Experimental investigation on the coupling rules of PCB based on the ESD immunity test platform

Based on an ESD immunity test platform defined by IEC 61000-4-2 and with the contact discharge, the peaks of coupling voltage and current, which induced in a printed circuit board (PCB), were measured at different discharge voltages. Through the data these rules were found, they are: the peaks of coupling voltage(U_p) and current(I_p) are linear to the discharge voltage(U_esd) in the range of -0.3 KV~-4.2 KVand 0.3 KV~4.2 KV, that is: U_p=a₁U_esd+b₁; I_p=a₂U_esd+b₂. In addition, the trend line of Up and the output impedance of a coupled circuit in the PCB under test were provided in this paper.