NFP-3 is used with RIGOL DSA series spectrum analyzers for the EMI tests of electronic products. It can be used to test the magnetic field strength and magnetic field coupling channels on the surface of electronic components as well as the magnetic field environment near electronic modules so as to quickly locate the interference source. NFP-3 includes four models (NFP-3-P1, NFP-3-P2, NFP-3-P3 and NFP-3-P4).