6 Frequency and Time Domain Analysis138 Keysight U8903A User’s GuideGraph FunctionsThis section describes the commonly used graph functions which allow you toperform peak searching, configure the markers, select the marker position on thegraph, or maximize the graph view to the full display size by pressing thecorresponding key on the Graph panel.Peak searchThis function enables you to place a marker on the peak or minimum of the graph.You can set the threshold level that the marker can identify as a peak or minimumon the graph. If the trace is above the threshold level, it will be identified as apeak, whereas the trace below the threshold level will be identified as a minimum.Use the knob on the U8903A front panel to move the threshold level along theplot. The X-axis and Y-axis values of the marker will be displayed at the top rightof the graph when you place a marker at either the right or left peak, or right orleft minimum of the graph.To access the peak search function, press on the Graph panel. The PeakSearch menu is shown as follows.Figure 6-9 Peak Search menu
