Bovi,
There are some graph settings that you can set by going to Configure>>Report Options. You can set thee maximum number of elements that will appear in the graph. Unfortunately, there is not a way to change the exact range of the graph that appears in the report. This is handled automatically by TestStand.
If you do need a graph with an exact range, you could export your array to LabVIEW or CVI and graph the data. Then export the graph to a bitmap file. Then in TestStand, you could insert that bitmap into your html report.
That is just one idea that could help you. I'm sure there are probably other solutions as well. Hopefully that will get you a good start.
Regards,
Shannon R.
Applications Engineer
National Instruments