A note on the quasi-peak detector usage.
Usually, it is not used for the whole scan, but instead, a peak detector sweep is done. Then a list of highest peaks is compiled and quasi-peak levels are determined for each of these frequencies. IIRC if values determined with peak detector are sufficiently below quasi-peak limits, then the quasi-peak phase is skipped altogether. The effect of quasi-peak is that rarely repeating peaks are somewhat attenuated, so even if peak level might exceed the limit, it is possible that quasi-peak is below limit, depending on the duty cycle.
This same process is used for radiated emissions, quasi-peak measurement is only done for highest peaks, which must be then below limits. Otherwise, the whole measurement would take far too long. Even with peak scans, the final radiated emission measurement takes several hours, as various antenna heights and polarizations are being looped through. Conducted emission measurement is usually much faster since there is no antenna to scan with, only all conductors are measured separately.
Regards,
Janne