540 Keysight N9915-90020 User’s Guide
Interference Analyzer (SA Mode) – Option 236
Spectrogram and Waterfall Displays
—Press Meas Setup 4.
—Then
Spectrogram Settings or Waterfall Settings
— Then choose from the following:
—
Red Limit
Using the arrows, rotary knob, or keypad, select the
HIGHEST power level that you expect to measure. This power level,
and those measured higher than this level, appear Red.
—
Blue Limit Using the arrows, rotary knob, or keypad, select the
LOWEST power levels that you expect to measure. This power level,
and those measured lower than this level, appear Blue.
How to Restart the Spectrogram/Waterfall
Press Sweep 3
then Restart
Averaging
Averaging can be enabled on the underlying measurement. Press Meas 4
then
Average Type. Learn more in “Average Type” on page 204.
Mode Preset
Mode Preset resets ONLY the Spectrogram and Waterfall display settings. It
does not reset the measurement settings.
—Press Preset
—Then
Mode Preset
Waterfall Display
The live trace is always drawn on a Waterfall display. Older trace records scroll
up from the displayed trace and eventually off the screen. Because of this,
locate the live trace on the bottom of the screen using the scale and reference
settings. Learn how in
“Scale and Units” on page 159.
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 Waterfall
display:
— Frequency Range. Learn more in
“Frequency Range” on page 151.
— Resolution BW and Video BW. Learn more in
“Resolution Bandwidth (Res
BW)” on page 187
and “Video Bandwidth (Video BW)” on page 188.
— Sweep Time (Acquisition). Learn more in.
“Sweep Acquisition” on page 193
Although this document refers to past traces as ‘records’ these traces are
not saved. They are only drawn on the FieldFox screen. See
“Record
Playback Example (SA Only)” on page 554
for how to save traces.
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