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Time stamp on Waveform Charts

I'm making an application where I sample data every 5 seconds. I use the Time Delay VI to obtain the sampling interval, and then set the chart options using chart properties/format and precision/relative time. The chart is adding a point every 5 secs as it should, scale looks ok. However, the time scale on the graph is incrementing only one second at the time (although actual time elapsed is 5 secs). The log file gives the time stamps just as it should. Is there a way to make the waveform chart give the real time (other than the obvious solution of sampling 1 pt/sec)?
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Are you building a waveform using the acquired points?

or are you just directlly passing acquired scalar points to the chart?

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I'm just directly passing scalar values to the chart. The total acquisition time is about an hour, and the idea is to display data as they vary with time.
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