Sampling Probe Watch Window

FlexRIO Help

Edition Date: November 2015

Part Number: 372614J-01

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Requires: FPGA Module

Right-click a wire in a sampling source and select Sampling Probe»FPGA from the shortcut menu to display this window. In a host VI, you also can right-click a For Loop or While Loop border and select Mark as Probe Sampling Source to display this window.

Use this window to manage sampling probes.

This window includes the following components:

  • Sampling Sources—Lists configured sampling sources. The waveform graph displays any sampling probes associated with the sampling signal you select.
  • Probe List—Displays all probes associated with the sampling source you select from the list of Sampling Sources. This list sorts probes in the order you create them.
    • Probe(s)—Displays the probes in a tree diagram in the order you create them.
    • Value—Displays the value of the probed wire at the cursor position.
  • Toolbar—Contains the following options:
    • Remove Sampling Source—Removes the selected sampling source and all associated Sampling probes. If only one sampling source is available, Remove Sampling Source also closes the Waveform Probe Watch Window.
    • Remove Selected Probe—Removes the selected probe.
    • Pan Tool—Picks up the plot and moves it around on the display.
    • Zoom In About Point Tool—Zooms in on the point you click. Press and hold the <Shift> key to switch between Zoom In About Point and Zoom Out About Point.
    • Zoom Out About Point Tool—Zooms out from the point you click. Press and hold the <Shift> key to switch between Zoom Out About Point and Zoom In About Point.
    • Zoom Over Range Tool—Zooms in on an area of the graph along the x-axis. Click a point you want to be the edge of the area and drag the cursor to select the area.
    • Zoom To Fit—Autoscales all x-scales on the graph. You can use this option to clear any previous zooming actions.
    • Previous Transition—Moves the cursor to the previous signal edge.
    • Next Transition—Advances the cursor to the next signal edge.
    • Add Clocks—Adds the timing source clock signal to the Probe List and displays the signal on the graph. This component is available only for Sampling probes with a single-cycle Timed Loop as the sampling source. Otherwise, LabVIEW dims this component.
  • Waveform Graph—Plots the probe signals in the Probe List. Each plot represents a different bit in the digital pattern. For For Loop and While Loop sampling sources, the graph plots the probe signals against iterations of the loop. Otherwise, the graph plots the signals over time in ns.
Note  In the FPGA VI, LabVIEW supports using Sampling probes only in single-cycle Timed Loops. Probes placed outside a single-cycle Timed Loop might not be accurate with respect to timing.
Note  Sampling probes support the fixed-point and Boolean data types as well as all integer data types.

Right-click the Probe List to display the shortcut menu. This menu contains additional options for customizing the Probe List view.

The following two options are available on the shortcut menu that appears when you right-click the data in the waveform graph subpanel of the Sampling Probe Watch Window.

  • Copy Data—Copies the data for pasting to other controls in the same VI or other VIs. This option is also available on the shortcut menu that appears when you right-click a probe listed in the Sampling Probe Watch Window.
  • Export—You can export data from the waveform graph and then import the data to the clipboard, Microsoft Excel, or DIAdem.
    Note  You must have Microsoft Excel installed to export data to Excel. You must have DIAdem installed to export data to DIAdem. Refer to the National Instruments website at to learn more about DIAdem and to download the latest version of DIAdem.


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