Anritsu Spectrum Master MS2720T, Руководство пользователя

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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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