Agilent Technologies E4406A manual Marker Functions, Search Marker

Making Measurements

Preparing for Measurements

•Select - Enables you to select one, or more, of the four available markers. Once selected, a marker can be activated, or deactivated, by using the Normal, Delta, or Function keys. If a marker has previously been turned on and assigned to a specific trace it will become active on that trace when the Select key is pressed.

•Delta - Places two markers on the selected trace or, if a marker is already active, places a second marker at the position of the active marker. You can activate up to two sets of delta markers. Annotation in the active function area and in the upper-right corner of the display show differences between the two markers in the units of the window which contains that marker.

•Off - Turns off the selected marker (as set by the Select key).

•Marker All Off - Turns off all markers.

•Shape - Allows you to select markers in the shapes of diamonds, crosses, squares, and lines. The line markers run vertically, from the bottom to the top of the display, while the diamond, square, and cross shapes simply allow you to distinguish different points on the trace by using different shapes. You may use up to four different shaped markers at a given time, although only one may be active.

Marker Functions

The marker Function menu key enables you to use two marker functions: Band Power and Noise. These functions do not apply to all measurements; if you attempt to press a function key for a function that is not applicable to that measurement a message will appear telling you that the function is not supported under the current measurement. These functions are described below. Press Marker, Function to access the following keys.

•Band Power - Allows you to place two markers to either side of a band so you can measure the power within that band. You can use the RPG knob to move the band markers; the numerical power reading will be visible in the upper right corner of the display. This feature is particularly useful for measuring channel power.

•Noise - Normalizes the equivalent amplitude of the measured noise to a 1 Hz bandwidth, which is centered around the displayed marker. This is done by sampling and displaying the average of 32 data points.

Search Marker

The front panel Search key performs a peak search when pressed. A marker will automatically be activated at the highest peak.

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