The GKT-006 is a near field probe set which is used to connect to a spectrum analyser (in most of cases) to detect the E or H field. The detection is done by holding the probe and moving it around the DUT as shown in Fig.4. When the probe is moved to the vicinity of the source, the E/H field will be inducted through the probe, showing the measured strength on the spectrum analyzer. The emission source can be located accordingly.

During the operation, the probes (two loop and one stub probe) are used by means of "non-direct touch" so the probes will induct the E/H field. The probes are insulated with plastic so that short circuits to the DUT are avoided.

Different types of probes are chosen to fit different frequencies and DUT shapes. The tip probe is a direct touch probe which allows the probe tip to directly test the circuits. Even though there is no ground connection to the probe the FR signal can still be measured for spot testing and location measuring.