9- 2 Keysight N9912-90001 User’s Guide
Interference Analyzer (SA Mode) – Option 236
Spectrogram and Waterfall Displays
9-
Spectrogram and Waterfall Displays
Spectrogram and Waterfall displays provide a visual history of the measured
spectrum. Each display type can be used to locate intermittent signals or to
view signal levels and frequencies over time.
Spectrogram is a single horizontal line of color-coded power while Waterfall
uses a 3-D color-coded display. The functional difference between these two
displays is that Spectrogram provides less trace detail than Waterfall display.
However, it also allows more traces to be viewed.
These two displays can NOT be used with Channel Measurements.
Spectrogram Display
Spectrogram draws the most recent trace record at the bottom of the stack of
previously-drawn trace records. Drawing the live trace on the display is
optional.
Figure 9-1 Spectrogram display- Overlay view- with time markers 23 seconds apart.
The following settings all contribute to the sweep time of an individual trace,
and therefore, the total elapsed time that can appear on the screen in
Spectrogram display:
— Frequency Range. Learn more in “Frequency Range” on page 8-4.
— Resolution BW and Video BW. Learn more in “Resolution Bandwidth (Res
BW)” on page 8-20 and “Video Bandwidth (Video BW)” on page 8-21.
Although this document refers to past traces as ‘records’ these traces are
not saved in Spectrogram and Waterfall displays. They are only drawn on
the FieldFox screen. See “How to Record a Session” on page 9-9 to learn
how to save traces.
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