12.5 Use the Date/Time Scroll Bar to View Historical Data on the Graph

In the last exercise, you experimented with the duration selector to change the time duration of data being plotted on the graph. In this exercise you will use the date/time scroll bar to move backwards through the history of data being plotted.

 

1.  Click the duration selector drop-down list in the tool bar.

2.  Scroll to the top of the list.

3.  Select "2 Minutes" from the duration selector drop-down list.

4.  Click the scroll button to the far left of the date/time scroll bar.

The "now" button to the far right of the scroll bar will become highlighted in red (Figure 162), indicating that you are now viewing historical data that has been logged to disk. Additionally, the graph will be "frozen" indicating that you are viewing historical, logged data, rather than viewing live data as it occurs.

5.  Continue to click the scroll button to the far left of the date/time scroll bar to move backward through the historical data that has been logged for the booster tank level.

Figure 162

6.  Click the scroll button to the far right of the date/time scroll bar to move forward through the historical data that has been logged for the booster tank level.

7.  Click the now button (highlighted in red) to the right of the right scroll bar button to reset the time scale back to the present to view live data as it occurs in real time.