FCC tests use quasi peak measurements with video filtering to resemble the bandwidth of audio spectra within the IF and video filter combined. The rationale was that EMI of carriers should not introduce audio noise in communication bands.
The video filter is a peak detect and slow decay filter on the sweep so that information on deep nulls is ignored.
The quasi means it is BW limited to ~20kHz on peak detect, so that ns/us peaks in carrier are filtered out if they exist.