Real time Graph Display and Data logging  
  We have 2 icons:
1)Real time: Shows only 2 hours real time
2)Real time (Past) : If you want to see more than 2 hours ago graph, you must click this icon.
3)The computer save the realtim data file automatically until it is connected. But if you want to see it by CVS file in your computer separately, please click "CVS" icon. 
  More than 2 hours data, you must see the graph by using the "Real Time (Past)" icon.