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Graph Timestamp

LabVIEW SignalExpress 2011 Help

Edition Date: June 2011

Part Number: 371268M-01

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Time-domain graph displays in LabVIEW SignalExpress have three timestamp options for displaying signals. LabVIEW SignalExpress displays graphs of time-domain signals with timestamps that provide the clearest view of the signal or signals by default. You can change the timestamp of a graph by right-clicking the graph, selecting Time Stamp from the context menu, and selecting one of the following timestamp options:

  • Ignore—All the plots on the graph start at zero regardless of the actual timestamp of the plotted signals. Select this option to display multiple plots with unrelated timestamps, such as displaying an acquisition result and a simulation signal loaded from a file.
  • Absolute—All the plots on the graph display signals that show the actual timestamp of each waveform. This is the default setting for graphs of logged data. Use this option if you want to display a waveform acquired using a triggered digitizer where the timestamp reference (zero) is linked to the trigger point.
    Note Note  Because Windows is a non-deterministic operating system, absolute timestamps in LabVIEW SignalExpress are accurate to within 100 to 200 milliseconds.
  • Relative—All plots on the graph display signals relative to the start time of the reference signal you select. The reference signal starts at zero. For example, if you plot two waveforms time-stamped at 15 and 13 and select the first waveform as the reference, the two plots start at 0 and –2. This is the default setting for graphs of only one signal. Use this option if you want to display multiple channels that a multiplexed MIO board acquires and display the timing relationship between the different channels to correct for the inter-channel delays.
    Note Note  You cannot select a Relative timestamp for a Digital Graph display.

 

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