电子设备响应的非线性主要表现为端口非线性和转移非线性,为研究端口非线性条件下双端差模注入方法的可行性,理论分析了在不对受试设备特性做出限定的情况下双端注入和辐照之间的等效性,研究了以两耦合装置监测端电压的幅值和相位差作为等效依据的正确性,仿真分析了线缆两端为非线性负载时试验方法的可行性,通过在不同场强下将不同阻值的通过式负载接入线缆两端,试验研究了双端注入方法的准确性。结果表明:场强和等效注入电压线性外推关系的成立与两端设备特性无关;以耦合装置监测端电压的基波分量为等效依据,可保证终端响应的各次谐波分量均相等;当终端负载阻抗随场强增大而改变时,双端注入等效辐照试验所得两端负载响应的误差均<4.5%。因此,双端差模注入方法适用于端口非线性情况且准确性很高。 In order to study the feasibility of two-terminal differential mode injection under non-linear port conditions, the nonlinear response of electronic equipment is mainly characterized by port nonlinearity and transfer nonlinearity. The equivalence between the end injection and the irradiation, the correctness that the amplitudes and the phase differences of the terminal voltage monitored by the two coupling devices are taken as the equivalent basis is studied. The simulation analysis of the test method when the two ends of the cable are non-linear loads Feasibility. The accuracy of the double-ended injection method was tested experimentally by connecting the through-load of different resistances across the cable at different field strengths. The results show that the establishment of linear extrapolation relationship between field strength and equivalent injection voltage has nothing to do with the characteristics of equipment at both ends. The fundamental component of the terminal voltage monitored by the coupling device is equivalent basis, which can ensure that all the harmonic components of the terminal response are equal When the load impedance of the terminal changes with the increase of the field strength, the error of the load response at both ends of the double-ended injection equivalent radiation test is less than 4.5%. Therefore, the two-terminal differential mode injection method is suitable for port non-linearity cases with high accuracy.