Hi Hutomo,
I just noticed that this post has been duplicated many times. I think it'll be a better idea to just keep this topic onto one thread so that we can combine our efforts in assisting you. Since people have already been making comments here, let's just stick with that post. In the future it will be better if you just post once per topic, at National Instruments we do look at every post so don't worry about your questions not being addressed.
Jason L.
Applications Engineer
National Instruments