One can use the hand tool to quickly adjust the spectrum limits by clicking and holding down the left mouse button while moving the mouse pointer. The hand tool icon is located at the bottom of the display and highlighted in green when active. Holding down the button results in the center frequency being highlighted as a red vertical line in order to allow accurate adjustment of the spectrum as depicted in Figure: Drag and Drop Spectrum Browsing Using Center Frequency Marker.

Zooming can be done either by using the mouse wheel along with pressing the “Ctrl” key or by the adjusting the Zoom Tool Locater.

Mouse wheel zoom inside the spectrum chart will affect frequency and power axis scaling simultaneously. Conversely mouse wheel zoom can be done for either of the axes if the mouse pointer is directly set on the axis.

The zoom tool can be used by clicking on the zoom icon below the spectrum chart. Clicking and holding the left mouse button in the chart area allows defining a zoom area. Releasing the mouse button activates the new spectrum settings. By clicking the Hand Tool icon, the Zoom Tool is deactivated.

For an instant power measurement between distinct frequencies in the spectrum, one can use the vertical marker function (see Figure: Horizontal and Vertical Markers). Vertical markers can be set by pressing and holding the Ctrl key while moving the mouse pointer to the desired frequency in the spectrum window. A left click will drop the marker to its final position.

A second marker can be added in the same way in order to calculate the power between the region indicated by the two markers in the spectrum. Pressing the right mouse button, while having the “Ctrl” key pressed, erases all vertical markers.

The spectrum chart provides zoom functionality which can be activated by holding down the Ctrl key while moving the mouse wheel. One can also set horizontal markers in order to display power thresholds by keeping the “Shift” key pressed and moving the mouse to the desired position. Clicking the left mouse button fixes the marker position. Additional markers can be placed by repeating this procedure. Clicking the right mouse button along with the “Shift” key erases all horizontal markers.