3-4 Spectrogram Interference Analyzer (Option 25)
3-2 PN: 10580-00349 Rev. H Spectrum Analyzer MG
3-4 Spectrogram
A Spectrogram is a three dimensional representation of frequency, time and power useful for
identifying intermittent interference. Color is used to represent power levels.
Required Equipment
• An antenna that is appropriate for the frequency range to be measured
Required Setup
• Place the instrument in Interference Analyzer mode.
• Connect the antenna to the RF In test port.
Procedure
The following procedure demonstrates one example of an Interference Analyzer Spectrogram
setup.
1. For the most effective spectrogram display, press the Amplitude main menu key, press
the Reference Level submenu key and set the reference level such that the largest
signal to be displayed will be near the top of the spectrum analyzer area of the screen.
The reference value required can be determined by observing the color of the highest
signal and changing the reference level to place that value near the top of the spectrum
analyzer area.
2. Press the Scale submenu key and set the scale value to place the lowest signal near the
bottom of the screen. In general, 4 dB/division or 5 dB/division will be good starting
values.
3. Press the BW main menu key and set Auto RBW and Auto VBW On, or set the applicable
RBW and VBW values by pressing the RBW and VBW submenu keys.
4. Press the Measurements main menu key, then the Spectrogram submenu key to display
the spectrogram. Press the Spectrogram key again to open the Spectrogram Menu.
5. To change the time between sweeps, press the Sweep Interval submenu key and use the
rotary knob or keypad to set the time from 0 seconds to 60 seconds.
6. The instrument can be set so that spectrogram plots are automatically saved when the
display is full. Press the Record submenu key to toggle saving On or Off.
7. When Record is set to On, the Recording Time submenu key is displayed. Press this
submenu key to set how long the instrument will record the spectrogram before
stopping.
8. The Time Cursor submenu key is used to turn on the horizontal time cursor. Use the
up or down arrow key to move the cursor vertically through the spectrogram. The date
Note
If Sweep Interval is set to a value > 0, a message is displayed instructing you to
set the selected trace to Max Hold, Min Hold, or Average, which will determine
how multiple measurement traces are compressed into one spectrogram trace.
This allows extended measurement times to be set, either with the result on one
screen or when recording without running out of mass memory.
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