The Teledyne LeCroy T3SA3000-NFP probe set comprises of a set of four magnetic field probes for precompliance tests of printed circuit boards and other devices including components, connectors, wiring, power supplies, etc. The T3SA3000-NFP probe set is used to measure the magnetic fields in the area of the device to determine the source and level of disturbance emissions. The passive near field probes are connected to the 50 Ohm input of a spectrum analyser such as the Teledyne Test Tools T3SA3200 or T3SA3100, or to the input of a high sensitivity oscilloscope such as the Teledyne LeCroy high definition 12 bit HDO and WavePro HD families, or to a regular oscilloscope such as the Teledyne Test Tools T3DSO range. The probes can also be used with other brands of spectrum analyser or oscilloscope. The probes can then make comparative measurements of magnetic fields and disturbance currents in the frequency range from 30 MHz to 3 GHz.