Dear nebb,
first of all, graph is usually an offline plot of the acquired data but to use it as an online display u need to use build arrays in for/while loop which keeps on adding new points & plots in waveform graph.
I am including a vi which incorporates a while loop in which by using build array, points keep on increasing & simultaneously they are plotted in the waveform graph.
Using for or while loop, it has no concern with speed. it depends on the code inside the loop which makes them faster or slower.
For making slow readings, you can put some delay inside while looping.
Hope this works. YOur feedbacks are welcome.
Best Regards,
Nirmal Sharma
India