Playback Options

Navigate to a Playback work area and select View»Playback Options to display the Playback Options tab.

Use the Playback Options tab to configure playback options for logged data. After you configure playback options, drag the logged data to the Data View tab and click the Run button to play back the portion of logged data you specify on the Playback Options tab.

Note  When running logged data through analysis steps, LabVIEW SignalExpress only processes the portion of the logged data you specify on the Playback Options tab. If you do not configure playback options, LabVIEW SignalExpress processes the entire log by default.

• Logged signal—Displays all the logged signals in the project. Select a signal from the Logged signal list to configure playback options for that signal.
• Start/Stop playback time—Displays a graph of the data to play back. You can move the start and stop cursors to limit the data you want to play back.
  • Zoom—Zooms in on a section of the graph of data to play back. Hold the mouse button down and drag the cursor across the graph to select the section of data on which to zoom in.

    Note  Zooming in on a section of data does not change the start and stop time for playback. Use the Cursor Movement Tool or the Start time (s) and Stop time (s) fields to change the start and stop time.

  • Cursor Movement Tool—Enables you to grab and move the start and end cursors on the graph to change the start and end time for playing back data. You also can right-click the graph and select Start from here or End here from the shortcut menu to move the start and end cursors.
  • Panning Tool—Enables you to grab the plot and move it around in the graph display.
  • Autoscale X Axis—Autoscales the graph along the x-axis. If you zoom in on a section of data or use the Panning Tool to move the plot in the display, you can use this button to return the graph to its original appearance. You also can right-click the graph and select Autoscale X axis from the shortcut menu to autoscale the graph along the x-axis.

    Note  You also can right-click the graph and select Autoscale Y axis from the shortcut menu to autoscale the graph along the y-axis.

  • Start time (s)—When you select Relative to log start time in the Time format pull-down menu, specifies the time in seconds after the start of the logged signal to begin playing back the logged data.
    
    When you select Absolute in the Time format pull-down menu, specifies an actual timestamp from the log from which to begin playing back the logged data.
  • Stop time (s)—When you select Relative to log start time in the Time format pull-down menu, specifies the time in seconds after the start of the logged signal to stop playing back the logged data.
    
    When you select Absolute in the Time format pull-down menu, specifies an actual timestamp from the log at which to stop playing back the logged data.
  • Time format—Specifies the time format to use when configuring start and stop times for the playback of the logged data. You can select from the following options:
    • Relative to log start time—Configures the Start time and Stop time fields to specify the start and stop time of playback in seconds relative to the start time of the logged signal.
    • Absolute—Configures the Start time and Stop time fields to specify actual timestamps from the log for the start and stop time of playback.
• Playback block configuration—Contains options to configure the blocks of data in a logged signal. A block is a section of a signal that contains a specified number of samples. Playback block configuration contains the following options:
  • Block size (samples)—Specifies the size in number of samples of each block of data during the playback operation.
  • Overlap (%)—Specifies the percentage of overlap between blocks when playing back data.
  • Ignore last iteration if partial—Specifies to ignore the last iteration if it contains a partial block.
  • Number of iterations—Indicates the number of iterations LabVIEW SignalExpress plays back.
  • Sample rate—Indicates the sample rate of the logged signal.
  • Playback preview—Displays a preview of the playback data based on the Block size (samples) and Overlap (%).