The depth dimension pointing into the body, describing how deep the field reaches. Readings are taken on horizontal planes at set depths along it; z=0 is the coil surface itself, the reference every height value in the report is measured above.
Also known as: Z Plane, Measurement Surface
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.
