A single row of field strength measurements captured by sweeping a Gauss probe across the accessory surface at a fixed standoff distance from the coil face. The probe moves laterally from center outward, recording the field at each measurement point along the way. All readings in a scan line share the same distance from the coil.
The field is measured on a grid. Starting at the center, the test engineer steps a probe outward along each axis at a fixed point spacing, taking a reading at every point, and continues a little past the accessory edge to catch the field as it fades. The origin is the center of the accessory surface.
