To save a trace as a CSV:
1) Insert USB stick into the USB port on the front panel
NOTE: The format of the USB stick must be FAT32
2) Press STORAGE > Set BROWSER to DIR. You can press the button next to the Browser label to toggle the selection.
NOTE: The spectrum analyzer uses binary files (*.trc) and cannot use CSV files (*.csv) natively. CSV will not be available as a valid format if you are trying to save the file to the local drive (D:)
3) Use the scroll wheel to select Mobile Disk (E:)
4) Change File Type to Trace and press the back arrow to get back to the storage screen
5) Set Format to CSV
6) Press Save, use the keypad to write a filename (I use numbers, they are faster), and press OK