Power Measurements Using CCDF View

Use this view to create a Complementary Cumulative Distribution Function (CCDF) graph display view or to create a Gated CCDF graph display view. CCDF curves characterize the higher-level power statistics of a digitally-modulated signal and are defined by the percentage of time the signal power is at or above a given power level.

CCDF is applicable in the free-run, internal trigger, and external trigger modes.
Gated CCDF is applicable in the internal trigger and external trigger modes only.

Creating the CCDF View

From the Display 1 or Display 2 tab, click the CCDF button to create a new display view. Up to four display views can be added per tab.
The "Measurement Source Selection" dialog is then displayed. Select one of the available measurements from the list of connected instruments. Then select the desired CCDF type (Normal or Gated CCDF) and click OK to proceed. [Resize: 90%]
The CCDF display view is created with the assigned measurement displayed. To edit the measurement currently assigned to this view, click the Assign Measurement button (near the top of the Display tab) and select the desired measurement.

Display Options

On the right side of the current display view, a Tools Palette provides controls for the following display options.

	Change the title at the top of the current display view. You can also set the X-axis and y-axis parameters (minimum/maximum) for the displayed chart. For precise control of your x-axis and y-axis scales, click here.
	Area zoom. Use the mouse to draw a frame around the desired area of the graph to zoom in on.
	Zoom in horizontally. To zoom in vertically only, click the waveform (waveform turns into a thick line) and zoom in. Click the waveform again to return to the normal zoom mode.
	Zoom out horizontally. To zoom out vertically only, click the waveform (waveform turns into a thick line) and zoom out. Click the waveform again to return to the normal zoom mode.
	Reset scale the trace to defaults on both the x- and y-axis.
	Add up to five markers to the chart. To delete a marker, click this button again and unselect the desired marker from the drop-down list.
	Assign a reference trace.

For more precise control of your parameters for Gated CCDF measurements, select the Instrument Setup tab and then go to the "CCDF Setup" pane. From there you can enter the gate parameters shown below.

Chart Right-Click Operations

Right-click anywhere on the chart to display these options:

Save Chart Image to File - Export a screen shot of the chart to a JPEG, BMP, or PNG file, with a white grid on a black background. By default, the screen shot is stored in the "My Documents" folder on your computer. For example – C:\Users\<user_name>\Documents\Keysight\BenchVue\Power Meter\Exports\.

Copy Chart Image to Clipboard - Export a screen shot of the chart to the Windows clipboard.

Capturing Power Measurements Using the CCDF View

Before capturing power measurements, you will need to configure your measurements from the Instrument Setup tab. If you have multiple Power Meters connected to this bench application, be sure to configure each instrument from the "Additional Instruments" panel on the left side of the Instrument Setup tab. For more information, see Connecting Additional Instruments.

Note: A subset of the commonly used measurement parameters is also available from the Settings tab located on the Display tab. See the "Calibration", "Channel Setup", "CCDF Setup", and "Trigger Setup" drop-down panes to edit those measurement parameters.
To start the measurement acquisition for this view, click the button next to the "Measurement" properties drop-down pane. Measurements and operations will be displayed in real time. To stop the measurement acquisition for this view, click the button next to the "Measurement" properties drop-down pane.
To start all assigned measurements on all display views simultaneously, click the button located at the bottom of the Settings tab. Measurements and operations will be displayed in real time. To stop all assigned measurements on all display views simultaneously, click the button located at the bottom of the Settings tab.

Information Panel Drop-Down

As shown in the screen capture above, an Information Panel drop-down is provided under the current display view. This panel summarizes important measurement information for the current display view.

Marker Summary - Click this tab for a summary of the Marker measurements for the current trace view.

Table Summary - Click this tab for a summary of measurement parameters in tabular format.