Bruce,
You could calibrate the device, make the measurement of interest, go to "Stimulus", press "Pause Sweep", and the data is saved in the nanovna. The device under test can be removed and the data is preserved in the nanovna. Unfortunately, I don't seem to be able to get the serial port to work once the nanovna is connected to a computer without resetting the device which drops all of the data.
Does anyone have a cell phone application that will read data from the nanovna using an On-The-Go cable? If so, this method could bring the data into the cell phone where it could be saved.
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Bryan, WA5VAH