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The method i have been using is connecting the source up to a dummy load (provided by the company for testing), to a pre-amp, to a oscilloscope. I took data off the oscilloscope but had issues in trying to understand how to get the correct values on the axis. An FFT seems needed, btu i am using igor for data processing and It only requires one set of data for an FFT and doesnt seem to require a time axis which perplexs me. It also doesnt help that i have not studied the math behind FFT's quite yet.

Does anyone have any suggestions? I have access to a Spec. Analyzer if thats useful, but it goes from 9KHz to 29.5Ghz, and the graph id like to reproduce goes from 0 to 10^5Hz.