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Using Real-time Spectrum Analyzer
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Persistent spectrum
The persistent spectrum of a signal is a time-frequency view that shows the percentage of the time that a given frequency is present
in a signal. It is a histogram in power-frequency space. The longer a particular frequency persists in a signal as the signal evolves,
the higher its time percentage and thus the brighter or hotter its color in the display. The persistent spectrum is used to identify
signals hidden in other signals.
Setting measure setup for Sound Indicator
If you have configured test parameters as described in the " Configuring Spectrum Measurements ", continue to set measure setup.
You can simply change Center Frequency and Span by tapping the icons right below the result chart screen.
1 Tap the Setup ( ) icon on the side bar.
2 Tap Sound Indicator .
a Tap to switch the Sound between On and Off to enable and disable the alarm sound.
b Tap to switch the Alarm Reference to Marker to set the active marker position as the alarm reference.
c Tap to switch the Alarm Reference to Line to set the limit as the alarm reference.
The Reference Line Mode menu becomes activated to be set.
d Select Reference Line to specify a threshold for the reference line using the on-screen keyboard.
e Optional. To adjust the volume for alarm sound, tap Volume and input from 1 to 10 using the on-screen keyboard.
Setting measure setup for Interference ID
The Interference ID automatically classifies interfering signals over a designated spectrum and displays the list of possible signal
types corresponding to the selected signal.
1 Tap the Setup ( ) icon on the side bar.
2 Tap Interference ID .
a Tap to switch the Interference ID between On and Off to turn the Interference ID on and off.
b Tap Threshold and input a value using the on-screen keyboard.
Setting measure setup for POI
The Interference ID automatically classifies interfering signals over a designated spectrum and displays the list of possible signal
types corresponding to the selected signal.
1 Tap the Setup ( ) icon on the side bar.
2 Tap POI . You can also access this menu via Quick Access and Display Tab on top.
a Tap to switch the Mode between High and Normal .
The following table shows RBW and Span setup range per Normal and High mode.
Mode A B C
D
Normal
POI
100 to 34 μs 392 to 136.5 μs 800.5 to 270.5 μs 3200 to 1076 μs
Bandwidth 100 to 20 MHz 19 to 5 MHz 4 and 3 MHz 2 and 1 MHz
RBW 30 kHz to 10 MHz 10 kHz to 1 MHz 3 kHz to 1 MHz 1 kHz to 300 kHz
Mode A B C
D E F
High
POI
18.5 to 2.5
μs
29.5 to
4 μs
73.5 to 7.5
μs
147 to 15 μs 284 to 28 μs
587 to 56.5
μs