There are two things that you can look at here. First, you can configure the number of data points in the chart history of the graph by going to the Graph tab in the property pages, change the Chart history option from Automatic to Fixed, and change the fixed value from 200 to 1000. Alternatively, you can configure the range of the axis by going to the Axes tab in the property pages, select the axis that you want to configure, uncheck Auto scale, and set the Minimum and Maximum properties to what you want the range of the axis to be.
- Elton