Troubleshooting Hints - Keysight X Series Measurement Manual

Step
Figure 9-2 Occupied BW Measurement Result

Troubleshooting hints

Any distortion such as harmonics or intermodulation, for example, produces
undesirable power outside the specified bandwidth.
Shoulders on either side of the spectrum shape indicate spectral regrowth and
intermodulation. Rounding or sloping of the top shape can indicate filter shape
problems.
Action
115
Measuring Digital Communications Signals
Occupied Bandwidth Measurements
Notes