Keysight Technologies C Series - Page 539

Keysight N9915-90020 User’s Guide 537
Interference Analyzer (SA Mode) – Option 236
Spectrogram and Waterfall Displays
— Resolution (Number of Points). Learn more in “Points ” on page 203.
How to select Spectrogram
—Press Meas 1
> Interference Analysis > Spectrogram
How to modify the Spectrogram
You can change how the spectrogram is displayed relative to the data trace.
This setting affects the total number of trace records that can be displayed.
For SA Mode:
1. Press Meas Setup 4
> Spectrogram Settings > Spectrogram View
2. Press choose from the following:
— Overlay Displays the data trace over the spectrogram with NO
graticules. Total trace records: 340.
— Full Screen Displays the spectrogram with NO data trace. Total
trace records: 340.
—
Top Displays the data trace below the spectrogram. Total
trace records: 130.
— Bottom Displays the data trace above the spectrogram.
Total trace records: 130.
How to create Time Markers (SA Only)
Use Time Markers to determine the elapsed time between any two displayed
records. The most recent record appears at the bottom of the screen.
Moving a time marker will also ’push’ the displayed spectrogram (by modifying
the Playback Trace Number) to keep the marker on the screen (if possible).
Markers that indicate (mark) a trace ’off screen’ will be displayed at the top or
bottom of the plot - the location nearest to where that trace would be if the
spectrogram plot extended off the screen.
1. Press Meas Setup 4
> Time Markers > Time
2. Then enter a value from 0 (the most recent sweep record) to the maximum
value, using the numeric keypad, arrows, or the rotary knob. A “>”
indicates the Time Marker.
3. Then
Delta
4. Then enter a value from 0 (the most recent sweep record) to the maximum
value, using the numeric keypad, arrows, or the rotary knob. A “>>”
indicates the Delta Marker.
— At the current sweep speed, the difference in time between these
two markers appears at the upper-right corner of the view as
Delta
Time: hh:mm:ss Sec.