The TBPS01 EMC near field probes H20, H10, H5 and E5 are magnetic field (H) and electric field (E) probes for radiated emissions EMC pre-compliance measurements. The probes are used in the near field of sources of electromagnetic radiation. They serve to locate and identify potential sources of interference within the building blocks of electronic assemblies. The probes act similar as wide bandwidth antennas, picking up radiated emissions from components, PCB traces, housing openings or gaps and from any other parts that could be emitting RF. The probes are usually connected to a spectrum analyzer. Scanning the probe over the surface of a PCB assembly or housing quickly identifies locations which emit electromagnetic radiation. By changing to a probe with smaller size, the origination of the emissions can be further narrowed down. The TBWA2/20dB wideband amplifier is connected between EMC probe and Spectrum Analyzer to increase the dynamic range of the measurements.
A large probe will be able to detect radiation easier, however it will be difficult to decern what the source of the radiation is. Smaller probes allow you to tell which component of the device is emitting the radiation but will be more difficult to detect the radiation initially. The probes can be swapped mid-way through, detecting an initial signal with the larger probe, and then narrowing in on the source with the smaller probe. The smallest probe is a E-field probe and is used to detect electric field as opposed to the magnetic field for the 3 other larger probes.