Garth,
Yes, if you wanted to do this programatically, you could use the sa_api and tg_api. Do 2 sweeps, one with your reference through, and one with your DUT. For each point within the sweep, tune the TG then do a small (100 kHz span or smaller) sweep around the signal and find the max value. Subtract the 2 sweeps for your insertion loss. We created a support ticket for this issue, but I don’t know where it is in the queue, so a “DIY” TG sweep might be a good solution in the short run.
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