I was trying to take RF power measurements with RFSA running on PXI. Particularily, I used Zero-Span power vs time example file in the Labview 2009 package. I wanted to record time-stamped power mesurements for a period of 15-20 minutes and added WriteToFile block in the original design. Unfortunately, it prompts me with " measurement overwritten and the digitizer can not fetch beyond the available memory" error message after measuring for about one minute. I would like to know how to fix the problem.