I'm new to using this PNA, and experimenting slowly, one step at a time to understand its function and Labview 2011 drivers. I used my LV vi to fetch an .sta file I created manually weeks ago, and the display shows that machine setup and the data that was taken at that time. It shows the old trace and the Marker data for Markers 1, 2, and 3. Without testing a new DUT and making a new sweep, I'm trying to interrogate the existing old data that appears on the screen, using the driver VI that queries the Markers and the vertical axis settings, and I keep getting the error 'requested measurement not found', but it's clearly right there on the screen. Can't I access the data showing on the screen, or must I create data with a new sweep?