Hi Volker,
Thank you for the feedback. I think you might be interested in the peak table functionality. You can find it in the control panel along the bottom of the application in sweep mode. You can activate up to 16 peaks on the screen and measure freq/ampl deltas between those peaks. It sounds like this would satisfy your measurement requirements.
We are also looking into a dedicated intermod measurement in the future. Keep a look out in coming releases.
Regards,
Andrew
