NOTE: Trend Buffer options are set for Real Time data sources only.
If you have not already done so, insert a chart by selecting it from the Insert menu, or double-click an existing chart to access the chart's configuration panel.
Click the Data tab.
If necessary, add the pen(s) to the chart. There are two ways to add pens (choose one):
Click the (Real Time) pen you want to configure.
Select the Options Tab.
In the Trend Buffer section, select the type of strategy to use from the Strategy drop-down list. All Points will hold all points over a given duration. Interval will hold a specified number of points per given time interval.
If you selected All Points, enter the number of seconds to hold the points.
If you selected Interval, enter the number of seconds to hold the points in the Duration field, and the maximum number of points the buffer will hold in the Max Points field.