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Al's picture

Hello

You can now use the 'Delta' button on the plot tool bar, it subtracts the first sweep from any subsequent ones.
To use it change the mode to single and perform a sweep with your noise source. The connect the device under test and click the arrow next to the start button and change it to 'continue'. Press the button and a sweep will be added, if the 'Delta' button is pressed (looks like a triangle) you'll now see the difference between the two sweeps.

Hope that helps.