The RFS-B 3-2 is a passive near-field probe. Positioning the probe head vertically on the PC board sets the measuring coil directly onto the surface. This allows for measurements at hard-to-reach spots, e.g. between large components of on/off-controllers. The near-field probe has a sheath current attenuation and is electrically shielded. It can be connected to a spectrum analyzer or an oscilloscope with a 50 Ω input. It does not have an internal terminating resistance.