An improved apparatus and method for tuning a device under test uses a spider
diagram-like chart that provides the operator with visual cues as to the tuning
status of a device under test (DUT). The spider diagram may be displayed on a graphical
user interface (GUI), along with various adjustment points or potentiometers. The
spider diagram includes a unit circle that represents the acceptable bounds for
each measured parameter. Overlaying the unit circle is a polygon of three or more
sides, with a vertex of each angle of the polygon representing a measured parameter.
The polygon changes shape as the various potentiometers are adjusted. When a measured
parameter value is at the center of its allowable range, the vertex of the angle
corresponding to that measurement lies near the center of the unit circle. When
a measured parameter is at its upper or lower bound, the vertex lies on the unit
circle. When a measure parameter is less than its lower limit, or more than its
upper limit, the vertex lies outside the unit circle.
