I'm not familiar enough with the 744 to even know if it has a screen shot command but what I would do is since the data is already in your VI, either get the image of the LabVIEW graph and paste that to Excel or just pass the data to Excel and have Excel do a plot. I suspect that the fastest thing to do is to just pass the existing data to Excel and let Excel create the plot. It's not going to look exactly like the Tek's screen but you'll have to decide what's more important - having the exact picture but taking quite a while to transfer a graphics file over the gpib bus, or doing it quickly but slightly different format.