If Bandwidth Reduction - HP 8753E User Manual

Figure 6-27. IF Bandwidth Reduction
Another capability that can be used for effective noise reduction is the marker
Hints
statistics function, which computes the average value of part or all of the
formatted trace.
If your instrument is equipped with Option 085 (High Power System), another
way of increasing dynamic range is to increase the input power to the test
device using a booster amplifier.
Application and Operation Concepts