Configures the common properties specific to video triggering. The video triggering properties are polarity, enable DC restore, signal format, event, and line number. A video trigger occurs when the digitizer finds a valid video signal sync. Use the trigger holdoff to skip a specific number of frames between acquisitions. For example, to acquire a specific line number multiple times and repeat the same chroma phase, skip one frame in NTSC (121 ms < holdoff < 159 ms) and five frames in SECAM (201 ms < holdoff < 239 ms).


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Inputs/Outputs

  • ci32.png TV event —

    TV event specifies what TV event to trigger on.

    Refer to the Event property for defined values.

  • cu16.png trigger coupling —

    trigger coupling specifies how to couple the trigger signal.

    Refer to the Trigger Coupling property for defined values.

  • cu16.png polarity —

    polarity specifies the polarity of the video sync.

    Default Value: negative

    Defined Values:

    positive

    negative

  • civrn.png instrument handle —

    instrument handle identifies a particular instrument session.

  • cstr.png trigger source (Channel 0) —

    trigger source passes the source you want the digitizer to monitor for a trigger.

    Default Value: Channel 0

    Refer to the Trigger Source property for defined values.

  • cbool.png enable DC restore —

    enable DC restore offsets each video line so the clamping level (the portion of the video line between the color burst and the beginning of the active image) is moved to zero volt.

    Default Value: FALSE

  • ci32.png signal format (M-NTSC) —

    signal format specifies the video format to use.

    Refer to the Signal Format property for defined values.

  • cerrcodeclst.png error in —

    error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

  • cdbl.png trigger holdoff —

    trigger holdoff specifies the length of time the digitizer waits after detecting a trigger before enabling NI-SCOPE to detect another trigger.

    Default Value: 0.0 s

  • cdbl.png trigger delay —

    trigger delay specifies how long the digitizer waits after it receives the trigger to start acquiring data.

    Default Value: 0.0 s

  • ci32.png line number —

    line number specifies the line number to trigger on.

    The line number range covers an entire frame and is referenced as shown in Vertical Blanking and Synchronization Signal.

    The number of lines available depends on the format. For valid ranges, refer to the Line Number property.

    Default value: 1

  • iivrn.png instrument handle out —

    instrument handle out has the same value as the instrument handle.

  • ierrcodeclst.png error out —

    error out contains error information. This output provides standard error out functionality.